https://astro.theoj.org/ The Open Journal of Astrophysics is an arXiv overlay journal providing open access to peer-reviewed research in astrophysics and cosmology. en Wed, 01 Jul 2026 00:50:00 -0500 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. https://doi.org/10.33232/001c.164435 https://astro.theoj.org/article/164435-inflation-at-the-end-of-2025-constraints-on-r-and-n_s-using-the-latest-cmb-and-bao-data Wed, 01 Jul 2026 00:34:00 -0500 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. https://doi.org/10.33232/001c.164434 https://astro.theoj.org/article/164434-boris-and-exponential-integrators-in-the-theory-of-particles-interacting-with-magnetic-turbulence Tue, 30 Jun 2026 02:23:00 -0500 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 https://doi.org/10.33232/001c.164326 https://astro.theoj.org/article/164326-a-systematic-survey-for-hypervelocity-runaways-from-thermonuclear-supernovae Tue, 30 Jun 2026 02:07:00 -0500 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 https://doi.org/10.33232/001c.164325 https://astro.theoj.org/article/164325-on-the-effective-spin-mass-ratio-relation-of-binary-black-hole-mergers-that-evolved-in-isolation Tue, 30 Jun 2026 01:19:00 -0500 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. https://doi.org/10.33232/001c.163966 https://astro.theoj.org/article/163966-idealized-global-models-of-accretion-disks-with-strong-toroidal-magnetic-fields Mon, 29 Jun 2026 00:43:18 -0500 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. https://doi.org/10.33232/001c.164244 https://astro.theoj.org/article/164244-a-first-measurement-of-baryonic-feedback-with-fast-radio-bursts Mon, 29 Jun 2026 00:23:00 -0500 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 https://doi.org/10.33232/001c.164086 https://astro.theoj.org/article/164086-analysis-and-implications-of-the-spatio-spectral-morphology-of-the-fermi-bubbles Fri, 26 Jun 2026 02:48:00 -0500 How tidal heating alters the structure of stars near supermassive black holes, affecting mass transfer rates and potentially leading to low-luminosity active galactic nuclei and transient stellar phenomena https://doi.org/10.33232/001c.164077 https://astro.theoj.org/article/164077-mass-transfer-in-tidally-heated-stars-orbiting-massive-black-holes-and-implications-for-repeating-nuclear-transients Wed, 24 Jun 2026 02:12:00 -0500 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. https://doi.org/10.33232/001c.163764 https://astro.theoj.org/article/163764-dual-disk-galaxies-and-thermal-states-of-circumgalactic-medium Tue, 23 Jun 2026 02:06:00 -0500 This study uses cosmological hydrodynamical simulations and a random forest algorithm to understand how feedback processes affect gas distribution in galaxies by predicting gas density profiles in various models. https://doi.org/10.33232/001c.163762 https://astro.theoj.org/article/163762-interpretable-machine-learning-of-halo-gas-density-profiles-a-sensitivity-analysis-of-cosmological-hydrodynamical-simulations