It’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further seven papers, bringing the number in Volume 9 (2026) to 202 and the total so far published by OJAp up to 649. This means that the total in Vol. 9 (2026) has now passed that of Vol. 8 (2025), with more than three months to go.
I continue to include the posts made on our Mastodon account (on Fediscience); these announcements also contain a clickable form of the DOI for each paper. Our Mastodon account has regular updates and other announcements from OJAp too.
The first paper this week was published on Monday 7th September in the folder Astrophysics of Galaxies. The title is “Not all cores are equal: Phase-space origins of dynamical friction, stalling and buoyancy” and the authors are Shashank Dattathri & Frank C. van den Bosch (Yale U., USA), Uddipan Banik (Princeton U., USA), Martin Weinberg (U. Mass., USA), Priyamvada Natarajan (Yale U., USA), Zhaozhou Li (Nanjing U., China) and Avishai Dekel (The Hebrew U., Israel). The paper describes how the distribution function of a galaxy, not just its central density gradient, influences the efficiency and direction of dynamical friction, affecting the movement of massive objects within it.
The overlay is here:
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
New Publication at the Open Journal of Astrophysics: "Not all cores are equal: Phase-space origins of dynamical friction, stalling and buoyancy" by Shashank Dattathri & Frank C. van den Bosch (Yale U., USA), Uddipan Banik (Princeton U., USA), Martin Weinberg (U. Mass., USA), Priyamvada Natarajan (Yale U., USA), Zhaozhou Li (Nanjing U., China) and Avishai Dekel (The Hebrew U., Israel)
The second paper for this week, also published on Monday 7th September, but in the folder Earth and Planetary Astrophysics, is “The Third Option: Color Phase Curves to Characterize the Atmospheres of Temperate Rocky Exoplanets” by Drake Deming (U. Maryland, USA) and 8 others based in the USA, Germany and The Netherlands. This article presents a A spectroscopic survey of the Carousel lens galaxy cluster, identifying 12 lensed sources and 57 unlensed field galaxies. The findings could help constrain cosmological parameters and cluster properties.
The overlay looks like this:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "The Third Option: Color Phase Curves to Characterize the Atmospheres of Temperate Rocky Exoplanets" by Drake Deming (U. Maryland, USA) and 8 others based in the USA, Germany and The Netherlands.
The third paper of the week, also published on Monday 7th September but in the folder High-Energy Astrophysical Phenomena, is “Dependences of radio pulsar parameters on the kick velocity” by Anton D. Lazarev and Sergei B. Popov (Moscow State U., Russia). This study analyzes the velocity kick of neutron stars, finding that 23% belong to the low-velocity mode. Differences in magnetic field distribution emerge, but no significant bimodality in physical parameters.
The overlay is here:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "Dependences of radio pulsar parameters on the kick velocity" by Anton D. Lazarev and Sergei B. Popov (Moscow State U., Russia)
The fourth paper of the week is “A Dusty Quenching-Candidate AGN host at z=5.7: massive quiescent galaxies may quench already during the dust-obscured phase” by Francesco D’Eugenio (U. Cambridge, UK) and 14 others from the UK, Italy, China and The Netherlands. It was published on Wednesday 8th September in the folder Astrophysics of Galaxies. This article concerns RUBIES-EGS-9809, a dust-reddened galaxy with a dominant point-source component, suggests that AGN feedback may influence its host., indicating that massive galaxies can host evolved stellar populations during their dust-obscured phase.
The overlay is here:
The officially-accepted version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "A Dusty Quenching-Candidate AGN host at z=5.7: massive: quiescent galaxies may quench already during the dust-obscured phase" by Francesco D'Eugenio (U. Cambridge, UK) and 14 others from the UK, Italy, China and The Netherlands.
The fifth paper of the week is “The Carousel Lens I: A Spectroscopic Survey of the Carousel Lens Field” by Jackson H. O’Donnell (U.C. Santa Cruz, USA) and 22 others from around the world. This was published in the folder Astrophysics of Galaxies on Thursday 10th September 2026. This paper presents a spectroscopic survey of the Carousel lens galaxy cluster, identifying 12 lensed sources and 57 unlensed field galaxies. The findings could help constrain cosmological parameters and cluster properties.
The overlay for this one looks like this:
The officially-accepted version of this paper is on arXiv here and the Mastodon announcement on the fediverse here:
New Publication at the Open Journal of Astrophysics: "The Carousel Lens I: A Spectroscopic Survey of the Carousel Lens Field" by Jackson H. O'Donnell (U.C. Santa Cruz, USA) and 22 others from around the world.
The penultimate, sixth, paper of the week is “No Gravitational Anomaly in Wide Binaries from Forward Modeling of 3D Orbits” by Serat M. Saad and Yuan-Sen Ting (Ohio State U., USA). This was also published on Thursday 10th September, but in the folder Solar and Stellar Astrophysics. The study reanalyzes a dataset on gravitational anomalies, finding results consistent with Newtonian gravity, contrary to previous findings that suggested Modified Newtonian Dynamics. The overlay for this one is here:
The officially accepted version is on arXiv here and the Mastodon announcement here:
New Publication at the Open Journal of Astrophysics: "No Gravitational Anomaly in Wide Binaries from Forward Modeling of 3D Orbits" by Serat M. Saad and Yuan-Sen Ting (Ohio State U., USA)
Last but by no means least we have “The quenching time and timescale distribution of z~2 quiescent galaxies from precise colour distribution analysis” by Vivienne Wild (U. St Andrews, UK), Ho-Hin Leung & Adam Carnal (U. Edinburgh, UK) and Maya Skarbinski (Johns Hopkins U., USA). This paper was published on Thursday 10th September in the folder Astrophysics of Galaxies. It describes a study that uses simulation-based inference to analyze galaxy formation and quenching times, revealing that galaxies must quench rapidly post-Big Bang to achieve a specific color distribution.
The overlay is here:
The final version of this paper is on the arXiv here and the Mastodon announcement here:
New Publication at the Open Journal of Astrophysics: "The quenching time and timescale distribution of z~2 quiescent galaxies from precise colour distribution analysis" by Vivienne Wild (U. St Andrews, UK), Ho-Hin Leung & Adam Carnal (U. Edinburgh, UK) and Maya Skarbinski (Johns Hopkins U., USA)
It is worth mentioning that there was one deferred arXiv mailing this week, due to the Labor Day holiday in the USA, so some papers were therefore published a day later than usual.
That concludes this week’s update. I’ll do another next weekend.
After a very busy week, it’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further five papers, bringing the number in Volume 9 (2026) to 194 and the total so far published by OJAp up to 642. As explained at the end of this post, one of the five publications is a correction of an earlier paper.
I continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper. The Mastodon account has regular updates and other announcements from OJAp too.
The first paper this week was published on Monday 31st August 2026 in the folder Earth and Planetary Astrophysics: “Modeling Carbon-Based Planets with MAGRATHEA” by Robert L Royer (U. Nevada, USA), David R Rice (U. Wisconsin-Madison, USA) and Jason H Steffen (U. Nevada, USA). This describes a modification of the planetary interior solver MAGRATHEA to include Carbon-based mantles to enable it to understand more fully the range of possible planet structures.
The overlay is here:
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
New Publication at the Open Journal of Astrophysics: "Modeling Carbon-Based Planets with MAGRATHEA" by Robert L Royer (U. Nevada, USA), David R Rice (U. Wisconsin-Madison, USA) and Jason H Steffen (U. Nevada, USA)
The second paper for this week, published on Tuesday 1st September in the folder High-Energy Astrophysical Phenomena is “SCAT Data Release 1: 1812 optical spectra of 1331 transients” by Michael A Tucker (Ohio State University, USA) and 21 others from around the world. This is the first data release of the Spectroscopic Classification of Astronomical Transients survey includes 1812 spectra of 1331 transients, offering valuable insights for photometric/light curve classification pipelines.
The overlay looks like this:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "SCAT Data Release 1: 1812 optical spectra of 1331 transients" by Michael A Tucker (Ohio State University, USA) and 21 others from around the world.
The third paper of the week is “The neighboring stars of N6946-BH1 and the observational characteristics of failed supernovae” by Raquel Forés-Toribio and C. S. Kochanek (Ohio State University, USA). This study, published on Wednesday 2nd September 2026 in the folder Solar and Stellar Astrophysics, re-analyzes images of potential failed supernova N6946-BH1, finding four unrelated near-infrared neighbors. It also compares the luminosity of failed supernova remnants to stellar merger remnants, noting significant differences.
The overlay is here:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "The neighboring stars of N6946-BH1 and the observational characteristics of failed supernovae" by Raquel Forés-Toribio and C. S. Kochanek (Ohio State University, USA)
The fourth paper of the week is “How similar are narrow-line Seyfert 1 galaxies and high-z type 1 AGN?” by Marco Berton (ESO, Chile), Emilia Järvelä (Texas Tech. U., USA), Alessia Tortosa (INAF – Osservatorio Astronomico di Roma, Italy) and Chiara Mazzucchelli (Universidad Diego Portales, Chile). This was published on Thursday 3rd September 2026 in the folder Astrophysics of Galaxies. This paper reviews the properties of local narrow-line Seyfert 1 galaxies and compares them with high-redshift active galactic nuclei, aiding understanding of early black hole evolution.
The overlay is here:
The officially-accepted version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "How similar are narrow-line Seyfert 1 galaxies and high-z type 1 AGN?" by Marco Berton (ESO, Chile), Emilia Järvelä (Texas Tech. U., USA), Alessia Tortosa (INAF – Osservatorio Astronomico di Roma, Italy) and Chiara Mazzucchelli (Universidad Diego Portales, Chile)
CORRECTION issued at the Open Journal of Astrophysics: "CORRECTION – DESI Data Release 1: Stellar Catalogue" by Koposov et al. (2026) (DOI:10.33232/001c.155260)
In the past when we have had minor correctionsto make we have simply asked the authors to create a new version, then when it has been checked, to place it on arXiv with a comment on the correction made. We then change the overlay to point to the new version with a comment on the change. I was recently advised, however, that best practice is to create a specific entry in Crossref for the corrected version, linked to the old one. Our Scholastica platform now has a mechanism to do this so from now on we will adopt this approach.
After a very busy week, it’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further twelve papers, bringing the number in Volume 9 (2026) to 189 and the total so far published by OJAp up to 637. As I pointed out on Wednesday this week is the first during which we have published at least one paper in each of the six categories on astro-ph.
I continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper. The Mastodon account has regular updates and announcements from OJAp too.
In the past on these posts I have included the article keywords as tags, but this is quite a lot of effort to do for little benefit so I’ve decided just to tag the arXiv category (i.e. folder) and arXiv ID for each paper as well as the lede from the journal platform.
The first one up this week was published on Monday 24th August 2026 in the folder Astrophysics of Galaxies. “Energy-Space Analysis of Tidal Stripping in Stellar-Dark Matter Systems“, by Bradley Arias (UC Berkeley, USA), Nicole E. Drakos (U. Hawaii, USA) and James E. Taylor (U. Waterloo, Canada), uses simulations to explore how tidal stripping shapes the stellar distribution of dwarf galaxies, also suggesting a pathway for the formation of galaxies deficient in dark matter
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
New Publication at the Open Journal of Astrophysics: "Energy-Space Analysis of Tidal Stripping in Stellar-Dark Matter Systems" by Bradley Arias (UC Berkeley, USA), Nicole E. Drakos (U. Hawaii, USA) and James E. Taylor (U. Waterloo, Canada)
The second paper for this week, also published on Monday 24th August but in the folder Cosmology and Nongalactic Astrophysics is “Second Order Closures for the Radiative Transfer Equation: Some Are Unstable” by Nickolay Y. Gnedin and Harley Katz (U.Chicago, USA). This study explores higher-order closure relations in cosmic reionization simulations, finding that direct generalizations of M1 and OTVET are physically unstable, limiting second-order closure options.
The overlay looks like this:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "Second Order Closures for the Radiative Transfer Equation: Some Are Unstable" by Nickolay Y. Gnedin and Harley Katz (U.Chicago, USA)
New Publication at the Open Journal of Astrophysics: "Differentiable Forward Modeling for Efficient and Accurate Shear Inference" by Ismael Mendoza and 7 others on behalf of the LSST Dark Energy Science Collaboration.
New Publication at the Open Journal of Astrophysics: "BLG723.31.34651 as an eclipsing Roche lobe-filling sdOB+WD binary" by Alekzander Kosakowski, Charles E. Derbyshire, Sydney Jetton and Brad N. Barlow (University of North Carolina, USA)
The fifth paper of the week is “Differentiable Halo Mass Prediction and the Cosmology-Dependence of Halo Mass Functions” by Jim Buisman, Florian List and Oliver Hahn (U. Vienna, Austria). This was published on Tuesday 25th August in the folder Cosmology and Nongalactic Astrophysics; it presents a novel approach using a differentiable neural network model for predicting dark matter haloes abundance and their cosmology dependence, achieving competitive accuracy in identifying protohalo regions.Abstractfor Differentiable Halo Mass Prediction and the Cosmology-Dependence of Halo Mass Functions.
The overlay is here:
The officially-accepted version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "Differentiable Halo Mass Prediction and the Cosmology-Dependence of Halo Mass Functions" by Jim Buisman, Florian List and Oliver Hahn (U. Vienna, Austria)
The sixth paper of the week is “An astrometric search for planets in debris disk systems” by Elisabeth M Penderghast & Benjamin C Bromley (U. Utah, USA), Scott J Kenyon (Smithsonian Astrophys. Obs., USA) and Joan R Najita (NSF NOIRLab, USA). This was published on Tuesday 25th August 2026 in the folder Earth and Planetary Astrophysics. This study uses Gaia astrometric data and machine learning to identify stars with debris disks that may host undiscovered planets, providing potential subjects for future analyses.
The overlay is here:
You can find the officially-accepted version of the paper on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "An astrometric search for planets in debris disk systems" by Elisabeth M Penderghast & Benjamin C Bromley (U. Utah, USA), Scott J Kenyon (Smithsonian Astrophys. Obs., USA) and Joan R Najita (NSF NOIRLab, USA)
New Publication at the Open Journal of Astrophysics: "Precision Spectroscopy for 1.7 Million Galaxies from SDSS-IV: Improved Spectral Measurements and Catalogs for eBOSS" by Owen Matthews Acuña (U. Wisconsin Madison, USA) and 8 others based at various instititions in the USA.
The eighth paper of the week, published on Wednesday 27th August in the folder High-Energy Astrophysical Phenomena is the one that completed our full house for the week. This study presents XRISM observations of the merging cluster Abell 2034, revealing the broadest emission lines yet seen in a galaxy cluster, indicating potential turbulence and core disruption.
The overlay is here:
You can find the official version on arXiv here and the Mastodon announcement is here
New Publication at the Open Journal of Astrophysics: "The major cluster merger in Abell 2034 as seen by XRISM: Strong turbulence and spectral anomalies?" by Annie Heinrich (U. Chicago) and 7 others based in the USA and Europe.
New Publication at the Open Journal of Astrophysics: "Visualizing Disequilibrium: Tracing Two-Point Correlations to Specific Spatial Structures in the Milky Way" by Austin Hinkel and Josephine Vanzant (Thomas More U. USA)
The tenth paper of the week is “Assessing Self-Absorbed Molecular Lines as Tracers of Gravitational Collapse” by Lillian Y. Cai (Priinceton U., USA) and Felix D. Priestley & Sarah E. Ragan (Cardiff U., UK). This paper, reveals that traditional observational techniques probably underestimate true infall velocities and mass accretion rates in collapsing prestellar cores due to non-uniform radial velocity profiles.
The overlay for this one is here:
The officially accepted version can be found on arXiv here and here is the fediverse announcement:
New Publication at the Open Journal of Astrophysics: "Assessing Self-Absorbed Molecular Lines as Tracers of Gravitational Collapse" by Lillian Y. Cai (Priinceton U., USA) and Felix D. Priestley & Sarah E. Ragan (Cardiff U., UK)
New Publication at the Open Journal of Astrophysics: "The Impact of Non-Gaussian Line Spread Functions on Stellar Kinematic Recovery: Consequences for Dynamical Models" by David A. Simon (Oxford U, UK)
New Publication at the Open Journal of Astrophysics: "Impact and interplay of ΛCDM analysis choices for LSST cosmic shear" by Naomi Clare Robertson and 11 others for the FLAMINGO Team and the LSST Dark Energy Science Collaboration
In my recent weekly updates of activity at the Open Journal of Astrophysics, the latest of which is here, I’ve remarked that we had built up quite a backlog of papers accepted but yet to be published. This is no doubt due to August being a holiday for many researchers. Well, we seem to be catching up rather rapidly. So far this week we have published eight new papers, and it’s only Wednesday!
The recent burst of activity has led to us establishing a first, a week in which we have published a full house of at least one paper in each of the six sections of astro-ph on the arXiv. As a reminder, these are they:
astro-ph.GA – Astrophysics of Galaxies. Phenomena pertaining to galaxies or the Milky Way. Star clusters, HII regions and planetary nebulae, the interstellar medium, atomic and molecular clouds, dust. Stellar populations. Galactic structure, formation, dynamics. Galactic nuclei, bulges, disks, halo. Active Galactic Nuclei, supermassive black holes, quasars. Gravitational lens systems. The Milky Way and its contents
astro-ph.CO – Cosmology and Nongalactic Astrophysics. Phenomenology of early universe, cosmic microwave background, cosmological parameters, primordial element abundances, extragalactic distance scale, large-scale structure of the universe. Groups, superclusters, voids, intergalactic medium. Particle astrophysics: dark energy, dark matter, baryogenesis, leptogenesis, inflationary models, reheating, monopoles, WIMPs, cosmic strings, primordial black holes, cosmological gravitational radiation
astro-ph.EP – Earth and Planetary Astrophysics. Interplanetary medium, planetary physics, planetary astrobiology, extrasolar planets, comets, asteroids, meteorites. Structure and formation of the solar system
astro-ph.HE – High Energy Astrophysical Phenomena. Cosmic ray production, acceleration, propagation, detection. Gamma ray astronomy and bursts, X-rays, charged particles, supernovae and other explosive phenomena, stellar remnants and accretion systems, jets, microquasars, neutron stars, pulsars, black holes
astro-ph.IM – Instrumentation and Methods for Astrophysics. Detector and telescope design, experiment proposals. Laboratory Astrophysics. Methods for data analysis, statistical methods. Software, database design
astro-ph.SR – Solar and Stellar Astrophysics. White dwarfs, brown dwarfs, cataclysmic variables. Star formation and protostellar systems, stellar astrobiology, binary and multiple systems of stars, stellar evolution and structure, coronas. Central stars of planetary nebulae. Helioseismology, solar neutrinos, production and detection of gravitational radiation from stellar systems.
As of yesterday we had published in five of the six categories and were only missing a paper (in Number 4 – High-Energy Astrophysical Phenomena). Today, right on cue, from the queue, came this paper to complete the set:
There’s still a couple of days to go and we have more papers in the pipeline so it looks like I’ll have a busy time on Saturday morning when I do the next update!
Although it’s still holiday season for some, it’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further four papers, bringing the number in Volume 9 (2026) to 171 and the total so far published by OJAp up to 619.
I continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.
New Publication at the Open Journal of Astrophysics: "Search for neutrino emission from blazar γ-ray flares accounting for possible neutrino time delays" by Egor Podlesny & Foteini Oikonomou (Norwegian University of Science & Technology, Trondheim, Norway)
The second paper for this week, published on Tuesday 11th August in the folder Cosmology and Nongalactic Astrophysics is “The velocity coherence scale: a novel probe of cosmic homogeneity and a potential standard ruler” by Leonardo Giani (Swinburne University of Technology), Cullan Howlet (U. Queensland), Chris Blake (Swinburne), Ryan J. Turner (Australia National University) and Tamara M. Davis (U. Queensland) – all in Australia. This paper argues that velocity coherence scale, a measure that identifies the transition point of galaxy motion from correlated to anti-correlated, could potentially characterize the onset of cosmic homogeneity.
The overlay looks like this:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "The velocity coherence scale: a novel probe of cosmic homogeneity and a potential standard ruler" by Leonardo Giani (Swinburne U. Tech.), Cullan Howlet (U. Queensland), Chris Blake (Swinburne), Ryan J. Turner (ANU) and Tamara M. Davis (U. Queensland) – all in Australia.
New Publication at the Open Journal of Astrophysics: "A GLIMPSE of the 99%: a census of the faintest galaxies during the epoch of reionization and its implications for galaxy formation models" by Hakim Atek (Sorbonne Université, Paris, France) and 21 others based around the world.
The fourth and final paper of the week was published on Wednesday 12th August in the folder Astrophysics of Galaxies: “Dust and Grain Size Evolution in Galaxy Simulations: What Matters and What Does Not” by Massimiliano Parente & Desika Narayanan (U. Florida, USA) and Paul Torrey (U. Virginia, USA) presents the first implementation of an evolving dust grain size distribution within a model of galaxy evolution, successfully reproducing key observational constraints and exploring the mechanisms shaping galaxies.
The overlay is here:
The officially-accepted version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "Dust and Grain Size Evolution in Galaxy Simulations: What Matters and What Does Not" by Massimiliano Parente & Desika Narayanan (U. Florida, USA) and Paul Torrey (U. Virginia, USA)
That’s all for this week. We’re just ticking over at the moment, and steadily building up a backlog of papers to publish while we wait for authors to put their final versions on arXiv. I have a feeling there’s going to be a big splurge sometime. Will it be next week? We’ll find out next Saturday!
It’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further nine papers, bringing the number in Volume 9 (2026) to 160 and the total so far published by OJAp up to 608.
I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.
The first paper to report this week was published on Tuesday 21st July in the folder Cosmology and Nongalactic Astrophysics. The title is “Characterization of the Polarization Beam Response of SPT-3G Using Point Sources” by Tijmen de Haan (Institute of Particle and Nuclear Studies, Ibaraki, Japan) and an international cast of 101 others. This study presents measurements of the South Pole Telescope’s polarized beam response, indicating minimal sidelobe depolarization. The findings suggest potential explanations for frequency-dependent residuals in power spectrum analysis.
The overlay for this paper is here
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
New Publication at the Open Journal of Astrophysics: "Characterization of the Polarization Beam Response of SPT-3G Using Point Sources" by Tijmen de Haan (Institute of Particle and Nuclear Studies, Ibaraki, Japan) and 101 others from around the world
The second paper for this week, also published on Tuesday 21st July but in the folder Earth and Planetary Astrophysics is: “Exploring TRAPPIST-1 Climate States with an Energy Balance Model” by Jacob Haqq-Misra (Blue Marble Space, USA). The study uses a modified HEXTOR energy balance model to predict climate states of terrestrial planets orbiting low-mass stars, suggesting partial to complete ice cover for TRAPPIST-1 e and f.Abstractfor Exploring TRAPPIST-1 Climate States with an Energy Balance Model.
The overlay looks like this:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "Exploring TRAPPIST-1 Climate States with an Energy Balance Model" by Jacob Haqq-Misra (Blue Marble Space, USA)
New Publication at the Open Journal of Astrophysics: "A first systematic study of [OIII] 88μm at z>8: two luminous oxygen lines and a powerful ionized outflow in the first 600 million years" by Hiddo Algera (Institute of Astronomy and Astrophysics, Taipei, Taiwan) and 37 others from all around the world.
The fourth paper of the week, published on Thursday 23rd July in the folder Astrophysics of Galaxies, is “Mapping CO Ice in a Star-Forming Filament in the 3 kpc Arm with JWST” by Savannah Gramze (U. Florida, USA) and 16 others based all around the world. This paper shows that JWST observations and ALMA Band 3 data reveal that 50-88% of CO gas in a star-forming filament is locked in ice; corrections are needed for mass measurements in such systems.
The overlay for this one is here:
You can read the final version of this one on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "Mapping CO Ice in a Star-Forming Filament in the 3 kpc Arm with JWST" by Savannah Gramze (U. Florida, USA) and 16 others based all around the world.
New Publication at the Open Journal of Astrophysics: "Viscously Spreading Accretion Disks around Black Holes: Implications for TDEs, LFBOTs and other Transients" by Mila Winter-Granic and Eliot Quataert (Princeton University, USA)
The sixth paper of this week is “Characterising the response of an International LOFAR Station” by Letizia Vincetti (Trinity Collge Dublin, Ireland) and 9 others based in Ireland, USA, The Netherlands and Sweden. This was also published on Thursday July 23rd and is in the folder Instrumentation and Methods for Astrophysics. The article presents an investigation of the performance and calibration challenges of phased-array radio interferometers, using the Irish LOFAR station as a case study, highlighting the importance of accurate beam modelling, etc.
The overlay for this one is here:
You can find the final accepted version on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "Characterising the response of an International LOFAR Station" by Letizia Vincetti (Trinity Collge Dublin, Ireland) and 9 others based in Ireland, USA, The Netherlands and Sweden
New Publication at the Open Journal of Astrophysics: "Exo Skryer: A JAX-accelerated sub-stellar atmospheric retrieval framework" by Elspeth K.H. Lee (U. Bern, Switzerland)
New Publication at the Open Journal of Astrophysics: "GCR Spectra Reconstructed with Neutron Monitor Yield Function and Artificial Neural Networks: Comparison of Two Methods" by Stepan A. Siruk (Moscow Engineering Physics Institute MEPhI, Russia) and four others based in Russia
And finally for this week we have “The failed failed-supernova scenario of M31-2014-DS1” by Noam Soker (Technion, Israel), a paper which challenges the failed-supernova theory for the fading of the yellow supergiant event M31-2014-DS1, suggesting it requires unlikely parameters and supports an alternative scenario involving violent binary interaction. This was published on Friday 24th July in the folder High-Energy Astrophysical Phenomena.
The overlay for this one is here:
You can find the final accepted version on arXiv here and the Mastodon announcement is here:
And that concludes the update of this week’s business. As it was foretold, the total number of publications at OJAp has now passed the 600 mark, and the likely number for 2026 is around 300. We published a paper in five of the six astro-ph categories this week, but still haven’t had a week when we’ve published a full house with at least one in all six…
Back home to Maynooth, just in time for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further nine papers, bringing the number in Volume 9 (2026) to 145 and the total so far published by OJAp up to 593.
I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.
The first paper to report this week, published on Tuesday 7th July, is “The Information Content of Quasar Variability Light Curves: How Well Can we Infer Stochastic Model Parameters?” by Brendon Brewer (U. Auckland, NZ), Geraint F. Lewis (U. Sydney, AU), Xiang Yu & Yuan Li (Auckland). Published in the folder Astrophysics of Galaxies, this study suggests that quasar variability studies should focus on the short term volatility parameter, as it’s more informative than the variability timescale. Volatility decreases with redshift suggesting intrinsic effects.
The overlay for this paper is here
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
New Publication at the Open Journal of Astrophysics: "The Information Content of Quasar Variability Light Curves: How Well Can we Infer Stochastic Model Parameters?" by Brendon Brewer (U. Auckland, NZ), Geraint F. Lewis (U. Sydney, AU), Xiang Yu & Yuan Li (Auckland)
The second paper for this week, also published on Tuesday 7th July, but in the folder High-Energy Astrophysical Phenomena, is “Cygnus X-3 as a PeVatron and the LHAASO 2025 data” by Michael Kachelriess & E. Lammert (NTNU, Trondheim, Norway). This paper suggests that the high-mass X-ray binary Cygnus X-3 can accelerate cosmic rays beyond PeV energies, contributing to a photon flux peaking around PeV energies.
The overlay looks like this:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "Cygnus X-3 as a PeVatron and the LHAASO 2025 data" by Michael Kachelriess & E. Lammert (NTNU, Trondheim, Norway)
New Publication at the Open Journal of Astrophysics: "The DESI DR1 Peculiar Velocity Survey: growth rate measurements from galaxy and momentum correlation functions" by Ryan J Turner (Swinburne Institute of Technology, Australia) and 63 others from around the world.
New Publication at the Open Journal of Astrophysics: "On the effective spin-mass ratio relation of binary black hole mergers that evolved in isolation" by Sambaran Banerjee (Helmholtz-Instituts für Strahlen und Kernphysik, Germany) and Aleksandra Olejak (MPA Garching, Germany)
The fifth paper of the week, also published on Wednesday 8th July but in the folder Astrophysics of Galaxies, is “On the connection between galaxy orientation and halo absorption properties” by Rohan Venkat, Soo May Wee, and Hsiao-Wen Chen (U. Chicago, USA). This article investigates the azimuthal dependence of metal-line absorption in the circumgalactic medium of 87 isolated galaxies. The results show no significant correlation between absorption strength and azimuthal angle.
The overlay for this one is here:
You can read the final version of this one on arXiv here and the Mastodon announcement is here:
The sixth paper of this week is “Searching for Periodicity in FRB 20240114A” by Jonathan I Katz (Washington U., USA). This was published on Thursday 9th July in the folder High-Energy Astrophysical Phenomena. The study described in this paper observed FRB 20240114A, an active Fast Radio Burst, but found no significant periodicity in its bursts, contradicting magnetar models predictions.
The overlay for this one is here:
You can find the final accepted version on arXiv here and the Mastodon announcement is here:
The seventh article for this week is “Multiphase gas in Circumgalactic cloud complexes: Insights from kiloparsec-scale Magnetohydrodynamic Turbulence Simulations” by Rajsekhar Mohapatra (Princeton U., USA), Alankar Dutta (MPA Garching, Germany) and Prateek Sharma (Indian Institute of Science, Bangalore). This -paper was also published on Thursday 9th July, in the folder Astrophysics of Galaxies. This paper uses high-resolution simulations to investigate the mass distribution of the circumgalactic medium (CGM), a diffuse gas surrounding a galaxy’s halo with small-scale clumps of cold gas forming in quiescent regions.
The overlay for this one is here:
You can find the final accepted version of this one on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "Multiphase gas in Circumgalactic cloud complexes: Insights from kiloparsec-scale Magnetohydrodynamic Turbulence Simulations" by Rajsekhar Mohapatra (Princeton U., USA), Alankar Dutta (MPA Garching, Germany) and Prateek Sharma (Indian Institute of Science, Bangalore)
The (penultimate) eighth article for this week is “Line-of-sight shear in SLACS strong lenses I: shear and mass model parametrisations” by Natalie B. Hogg (U. Cambridge, UK), Daniel Johnson (U. Montpellier, France), Anowar J. Shajib (U. Chicago, USA) and Julien Larena (Montpellier). This was also published on Thursday 9th July, but in the folder Cosmology and Nongalactic Astrophysics. This article studies models of 23 strong gravitational lenses to measure line-of-sight shear for the first time, providing potential new constraints on cosmological parameters.
The overlay for this one is here:
You can find the final accepted version on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "Line-of-sight shear in SLACS strong lenses I: shear and mass model parametrisations" by Natalie B. Hogg (U. Cambridge, UK), Daniel Johnson (U. Montpellier, France), Anowar J. Shajib (U. Chicago, USA) and Julien Larena (Montpellier)
The ninth and last article for this week is “Current and future constraints on the expansion history of the GREA model” by Irene Graziotti (INAF-Osservatorio Astronomico di Capodimonte, Italy), Chiara De Leo (Sapienza University of Rome, Italy) and Matteo Martinelli (INAF-Osservatorio Astronomico di Roma, Italy). This study explores the General Relativistic Entropic Acceleration (GREA) framework, comparing it to the standard description of the universe. Current data favors the standard model, but GREA remains competitive.
The overlay for this one is here:
You can find the officially-accepted version on arXiv here and the Mastodon announcement here:
New Publication at the Open Journal of Astrophysics: "Current and future constraints on the expansion history of the GREA model" by Irene Graziotti (INAF-Osservatorio Astronomico di Capodimonte, Italy), Chiara De Leo (Sapienza University of Rome, Italy) and Matteo Martinelli (INAF-Osservatorio Astronomico di Roma, Italy)
As you can see, it has been a bumper week, especially when you consider that there was no arXiv mailing om Monday July 6th owing to the July 4th holiday in the USA. I should have known this would happen while I was travelling!
It’s Saturday again so it’s time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further seven papers, bringing the number in Volume 9 (2026) to 136 and the total so far published by OJAp up to 584.
I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.
The first paper to report this week, published on Monday 29th June, is “Analysis and implications of the spatio-spectral morphology of the Fermi Bubbles” by Ami Tank (Indian Institute of Technology) and Roland Crocker & Mark R. Krumholz (Australian National University). Published in the folder High-Energy Astrophysical Phenomena, this paper presents an analysis of the gamma-ray structures of Fermi Bubbles in the Milky Way using a decade of data. The research suggests either hadronic or leptonic processes can explain the data.
The overlay for this paper is here
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
New Publication at the Open Journal of Astrophysics: "Analysis and implications of the spatio-spectral morphology of the Fermi Bubbles" by Ami Tank (Indian Institute of Technology) and Roland Crocker & Mark R. Krumholz (Australian National University)
The second paper for this week, also published on Monday 29th June, but in the folder Cosmology and Nongalactic Astrophysics, is “A first measurement of baryonic feedback with Fast Radio Bursts” by Robert Reischke (Universität Bonn, Germany) and Steffen Hagstotz (Ludwig-Maximilians Universität München, Germany). This paper argues that Fast Radio Bursts (FRBs) provide a new method to trace baryon distribution and feedback in the cosmos, offering insights into matter distribution and rejecting no-feedback scenarios with high confidence.
The overlay looks like this:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "A first measurement of baryonic feedback with Fast Radio Bursts" by Robert Reischke (Universität Bonn, Germany) and Steffen Hagstotz (Ludwig-Maximilians Universität München, Germany)
The third paper of the week, published on Tuesday 30th June in the folder High-Energy Astrophysical Phenomena, is “Idealized Global Models of Accretion Disks with Strong Toroidal Magnetic Fields” by Minghao Guo & Eliot Quataert (Princeton U., USA), Jonathan Squire (U. Otago, NZ), Philip F. Hopkins (Caltech, USA) and James M. Stone (Princeton). This study uses global magnetohydrodynamic simulations to explore the behavior of idealized accretion disks with strong toroidal magnetic fields, finding that these systems maintain a moderately strong mean azimuthal field.
The overlay for this one is here:
The final, accepted version can be found on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "Idealized Global Models of Accretion Disks with Strong Toroidal Magnetic Fields" by Minghao Guo & Eliot Quataert (Princeton U., USA), Jonathan Squire (U. Otago, NZ), Philip F. Hopkins (Caltech, USA) and James M. Stone (Princeton)
The fourth paper of the week, published on Tuesday 30th June in the folder High-Energy Astrophysical Phenomena, is “On the effective spin-mass ratio relation of binary black hole mergers that evolved in isolation” by Sambaran Banerjee (Helmholtz-Instituts für Strahlen und Kernphysik, Germany) and Aleksandra Olejak (MPA Garching, Germany). This study explores mechanisms of binary black hole mergers and finds that certain spin and mass ratio trends can be naturally explained by isolated binary evolution. The overlay for this one is here:
You can read the final version of this one on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "On the effective spin-mass ratio relation of binary black hole mergers that evolved in isolation" by Sambaran Banerjee (Helmholtz-Instituts für Strahlen und Kernphysik, Germany) and Aleksandra Olejak (MPA Garching, Germany)
The fifth paper of the week, also published on Tuesday 30th June but in the folder Solar and Stellar Astrophysics is “A systematic survey for hypervelocity runaways from thermonuclear supernovae” by Kareem El-Badry (Caltech, USA), and 18 others based in the USA, Germany, Austria and the UK. This paper presents a systematic survey of hypervelocity runaways, resulting from white dwarf explosions in binary systems. The findings suggest a diversity of remnant masses, ages, and heating mechanisms, challenging theoretical models.
The overlay for this one is here:
You can read the final version of this one on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "A systematic survey for hypervelocity runaways from thermonuclear supernovae" by Kareem El-Badry (Caltech, USA), and 18 others based in the USA, Germany, Austria and the UK.
The sixth and penultimate paper of this week is “Boris and Exponential Integrators in the Theory of Particles Interacting with Magnetic Turbulence” by Andreas Shalchi (U. Manitoba, Canada). This was published on Wednesday 1st July, in the folder Solar and Stellar Astrophysics (it is posted in the plasma physics section of aXiv but cross-listed in solar and stellar astrophysics). The study compares the Rodrigues and Boris integrators in test-particle simulations of charged particles interacting with magnetic fields, finding both methods yield similar results.
The overlay for this one is here:
You can find the final accepted version on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "Boris and Exponential Integrators in the Theory of Particles Interacting with Magnetic Turbulence" by Andreas Shalchi (U. Manitoba, Canada)
The seventh and final paper for this week is “Inflation at the End of 2025: Constraints on $r$ and $n_S$ using the Latest CMB and BAO Data” by Lennart Balkenhol (Institut d’Astrophysique de Paris, France) and 12 others based in France, Italy, Switzerland, UK, USA and Australia. This was also published on Wednesday 1st July, in the folder Cosmology and Nongalactic Astrophysics. This study presents constraints on parameters of inflationary models in cosmology, using the latest cosmic microwave background and baryon acoustic oscillation data. The findings help differentiate between inflation models.
The overlay for this one is here:
You can find the final accepted version of this one on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "Inflation at the End of 2025: Constraints on $r$ and $n_S$ using the Latest CMB and BAO Data" by Lennart Balkenhol (Institut d’Astrophysique de Paris, France) and 12 others based in France, Italy, Switzerland, UK, USA and Australia.
And that concludes this week’s update. We’re starting to catch up on the backlog generated in June. At just past the halfway point of the year, which is where we are, we’re on 136 papers, which suggests a total around 272 for the year.
It’s Saturday again so it’s time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further three papers, bringing the number in Volume 9 (2026) to 129 and the total so far published by OJAp up to 577.
I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.
The first paper to report this week, published on Tuesday 23rd June, is “Interpretable machine learning of halo gas density profiles: a sensitivity analysis of cosmological hydrodynamical simulations” by Daniele Sorini & Sownak Bose (Durham University, UK), Mathilda Denison (U. Penn., USA) and Romeel Davé (University of Edinburgh, UK). This study uses cosmological hydrodynamical simulations and a random forest algorithm to understand how feedback processes affect the gas distribution in galaxies by predicting gas density profiles in various models. It is published in the folder Astrophysics of Galaxies.
The overlay for this paper is here
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
New Publication atthe Open Journal of Astrophysics: "Interpretable machine learning of halo gas density profiles: a sensitivity analysis of cosmological hydrodynamical simulations" by Daniele Sorini & Sownak Bose (Durham U., UK), Mathilda Denison (U. Penn., USA) and Romeel Davé (U. Edinburgh, UK)
The second paper for this week, published on Wednesday June 24th in the folder Astrophysics of Galaxies is “Dual-disk galaxies and thermal states of circumgalactic medium” by Masafumi Noguchi (Tohoku University, Japan). This paper explores the suggestion that the transition from thick to dual-disk galaxies is influenced by thermal changes in the circumgalactic medium (CGM), which also affects star formation.
The overlay looks like this:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
New Publication at the Open Journal of Astrophysics: "Dual-disk galaxies and thermal states of circumgalactic medium" by Masafumi Noguchi (Tohoku University, Japan).
New Publication at the Open Journal of Astrophysics: "Mass Transfer in Tidally Heated Stars Orbiting Massive Black Holes and Implications for Repeating Nuclear Transients" by Philippe Z. Yao and Eliot Quataert (Princeton University, USA)
And that concludes this week’s update. It has been another slow week on the publishing front. We have a steadily growing backlog of papers accepted for publication but with final versions yet to appear on arXiv. I suppose it’s the holidays…
P.S. The other day I checked the stats for the Open Journal of Astrophysics and saw that we’ve passed 8,000 citations. The average number of citations per paper is 14.0, which is not bad when you consider that over half the papers were published under a year ago…
It’s Saturday again so it’s time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further three papers, bringing the number in Volume 9 (2026) to 122 and the total so far published by OJAp up to 570.
I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.
The first paper to report this week, published on Thursday 11th June, is “Dancing Streams In Merging Halos: Stellar Streams in a MW–LMC-like merger” by (all based in the USA): Sachi Weerasooriya (Carnegie Observatories), Tjitske Starkenburg (Northwestern U.), Emily C. Cunningham (Columbia U.) & Kathryn V. Johnston (Flatiron Institute). This article explores how galaxy mergers, like the Milky Way-Large Magellanic Cloud merger, significantly alter the properties and structures of stellar streams, challenging the recovery of their initial orbits. It is in the folder marked Astrophysics of Galaxies.
The overlay for this paper is here
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
New Publication at the Open Journal of Astrophysics: "Dancing Streams In Merging Halos: Stellar Streams in a MW–LMC-like merger" by (all based in the USA): Sachi Weerasooriya (Carnegie Observatories), Tjitske Starkenburg (Northwestern U.), Emily C. Cunningham (Columbia U.) & Kathryn V. Johnston (Flatiron Institute).
New Publication at the Open Journal of Astrophysics: "X-SORTER (X-ray Survey Of meRging clusTErs in Redmapper): X-ray and Spectroscopic Characterization of 12 Optically Selected Galaxy Cluster Merger Candidates" by Christopher Hopp, David Wittman, Rodrigo Stancioli, Zhuoran Gao & Faik Bouhrik (UC Davis) and Scott Adler (Rochester), all based in the USA.
The third and final paper of the week, published on Friday 12th June in the folder Earth and Planetary Astrophysics, is “JCMT Constraints on the Early-Time HCN and CO Emission and HCN Temporal Evolution of 3I/ATLAS” by Jason T. Hinkle (U. Illinois, USA) and 6 others based in the USA and Chile. This article presents observations of the third Interstellar Object, 3I/ATLAS, providing early sub-mm constraints on its activity. The findings suggest a steeper production rate slope than typical Solar System comets.
The overlay for this one is here:
The final, accepted version can be found on arXiv here and the Mastodon announcement is here:
New Publication at the Open Journal of Astrophysics: "JCMT Constraints on the Early-Time HCN and CO Emission and HCN Temporal Evolution of 3I/ATLAS" by Jason T. Hinkle (U. Illinois, USA) and 6 others based in the USA and Chile.
And that concludes this week’s update. It has been a slow week on the publishing front, but the main reason is that we have a big backlog of papers accepted but waiting for the authors to put their final versions on arXiv and we can’t do anything about that! I’ll do another update next Saturday.
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