🔭 Category

astro-ph

961 papers

Ashes of FIRE: Modeling Dust Grain Size Evolution in the Local Group with FIRE

This paper introduces a new discretized grain size evolution model within the FIRE-3 framework that reveals a bimodal dust size distribution and demonstrates how the interplay between dust growth, destruction, and coagulation processes shapes Local Group dust abundances and extinction curve properties, while highlighting the need for alternative mechanisms like top-down PAH formation to explain observed infrared emission features.

Caleb R. Choban, Samir Salim, Dušan Kereš, Julia Roman-Duval, Karin M. SandstromTue, 10 Ma🔭 astro-ph

Non-common path aberration compensation and a dark hole loop with a pyramid adaptive optics system: Application to SAXO+

This paper presents end-to-end numerical simulations demonstrating that while non-common path aberration compensation significantly reduces residual starlight in the SAXO+ system, a dark hole loop achieves a superior factor of 200 reduction, with the study also establishing that calibrating pyramid optical gains is beneficial for single-loop systems but unnecessary for the dual-loop SAXO+ architecture.

C. Goulas, R. Galicher, F. Vidal, J. Mazoyer, F. Ferreira, A. Sevin, A. Potier, A. Boccaletti, E. Gendron, C. Béchet, M. Tallon, M. Langlois, C. Kulcsár, H-F. Raynaud, N. Galland, L. Schreiber, I. Bernardino Dinis, F. Wildi, G. ChauvinTue, 10 Ma🔭 astro-ph

ML in Astrophysical Turbulence I: Predicting Prestellar Cores in Magnetized Molecular Clouds using eXtreme Gradient Boosting

This paper presents a supervised machine learning framework using Extreme Gradient Boosting (XGBoost) to accurately predict the future 3D evolution and collapse of prestellar cores within magnetized molecular clouds by mapping instantaneous gas phase-space states, offering a computationally efficient alternative to traditional sink-particle algorithms.

Nikhil Bisht, David C. CollinsTue, 10 Ma🔭 astro-ph

Nonlinear evolution of unstable solar inertial modes: The case of viscous modes on a differentially rotating sphere

This paper investigates the nonlinear evolution of the Sun's most prominent high-latitude inertial mode (m=1m=1) on a differentially rotating sphere, demonstrating through direct numerical simulations that it undergoes a supercritical Hopf bifurcation where Reynolds stresses smooth the differential rotation to saturate the instability at amplitudes comparable to solar observations.

Muneeb Mushtaq, Damien Fournier, Rama Ayoub, Peter J. Schmid, Laurent GizonTue, 10 Ma🔭 astro-ph

Gas chemistry in the dust depleted inner regions of protoplanetary disks. I. Near-IR spectra and overtones

This study uses thermochemical modeling to demonstrate that dust-depleted inner regions of protoplanetary disks around Herbig stars are molecular-rich environments where dust sublimation significantly enhances SiO abundance, making CO and SiO overtone lines key tracers for understanding terrestrial planet formation.

J. Bethlehem, Ch. Rab, I. Kamp, M. Flock, G. Bourdarot, P. CaselliTue, 10 Ma🔭 astro-ph

Spatiotemporal Properties of Compressible Magnetohydrodynamic Turbulence from Space Plasma

Using multi-spacecraft observations from Earth's magnetosheath, this study provides the first quantitative evidence that compressible MHD turbulence exhibits a weak-to-strong transition specifically in slow modes, while fast modes remain weakly turbulent, thereby offering a comprehensive characterization of spatiotemporal properties across different turbulence regimes.

Siqi Zhao, Huirong Yan, Terry Z. Liu, Chuanpeng Hou, Ka Ho YuenTue, 10 Ma🔭 astro-ph

Multi-epoch afterglow rebrightenings in GRB 250129A: Evidence for successive shock interactions

This paper analyzes GRB 250129A and concludes that its multiple late-time afterglow rebrightenings are best explained by a sequence of refreshed shocks from delayed relativistic shell collisions, rather than single external-shock evolution or one-time energy injection.

D. Akl, S. Antier, H. Koehn, P. T. H. Pang, J. J. Geng, R. Gill, E. Abdikamalov, C. Adami, V. Aivazyan, L. Almeida, S. Alshamsi, C. Andrade, Q. André, C. Angulo-Valdez, J. -L. Atteia, K. Barkaoui, S. Basa, R. L. Becerra, P. Bendjoya, D. Berdikhan, E. Bernaud, S. Boissier, S. Brunier, A. Y. Burdanov, N. R. Butler, J. Chen, F. Colas, W. Corradi, M. W. Coughlin, D. Darson, T. Dietrich, D. Dornic, C. Douzet, C. Dubois, J. -G. Ducoin, T. du Laz, A. Durroux, D. Dutton, P. -A. Duverne, F. Dux, E. G. Elhosseiny, A. Esamdin, A. V. Filippenko, F. Fortin, M. Freeberg, L. García-García, M. Gillon, N. Globus, P. Gokuldass, N. Guessoum, P. Hello, R. Hellot, Y. H. M. Hendy, Y. L. Hua, T. Hussenot-Desenonges, R. Inasaridze, A. Iskandar, M. Jelínek, S. Karpov, A. Klotz, N. Kochiashvili, T. Laskar, A. Le Calloch, W. H. Lee, S. Leonini, X. Y. Li, A. Lien, C. Limonta, J. Liu, D. López-Cámara, F. Magnani, J. Mao, M. Mašek, E. Moreno Méndez, L. C. Menegazzi, W. Mercier, B. M. Mihov, M. Molham, S. Oates, M. Odeh, H. Peng, M. Pereyra, M. Pillas, T. Pradier, N. A. Rakotondrainibe, D. Reichart, J. -P. Rivet, F. D. Romanov, F. Sánchez-Álvarez, N. Sasaki, D. Schlekat, B. Schneider, A. Simon, L. Slavcheva-Mihova, R. Strausbaugh, T. R. Sun, A. Takey, M. Tanasan, D. Turpin, A. de Ugarte Postigo, L. T. Wang, X. F. Wang, Z. M. Wang, A. M. Watson, J. de Wit, Y. S. Yan, W. Zheng, S. Zúñiga-FernándezTue, 10 Ma🔭 astro-ph

LeMMINGs VII: 5 GHz, 50 mas e-MERLIN observations of a statistically complete sample of nearby AGN

This paper presents high-resolution 5 GHz e-MERLIN observations of a statistically complete sample of nearby galaxies, revealing that compact radio cores and jets are the primary manifestation of black hole activity in the local Universe, with up to 30% of galaxies hosting such radio-active nuclei.

D. R. A. Williams-Baldwin (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), R. D. Baldi (INAF - Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy), R. J. Beswick (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), I. M. McHardy (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), E. Carver (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), J. Clifford (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), B. T. Dullo (Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL 32114, USA), N. Kill (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), B. Krishnamoorthi (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), I. M. Mutie (Department of Astronomy and Space Science, Technical University of Kenya, P.O Box 52428 - 00200, Nairobi, Kenya, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), O. Woodcock (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), M. K. Argo (Jeremiah Horrocks Institute, School of Engineering and Computing, University of Lancashire, Preston PR1 2HE, UK), P. Boorman (Cahill Center for Astrophysics, California Institute of Technology, 1216 East California Boulevard, Pasadena, CA 91125, USA), E. Brinks (Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, UK), D. M. Fenech (SKAO, Jodrell Bank, Lower Withington, Macclesfield, SK11 9FT, UK), J. H. Knapen (Instituto de Astrofísica de Canarias, Vía Láctea S/N, E-38205 La Laguna, Spain, Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain), S. Mathur (Astronomy Department, The Ohio State University, Columbus, OH, 43210, USA, Center for Astronomy and Astro-particle Physics, The Ohio State University, Columbus, OH 43210, USA, Eureka Scientific, 2452 DELMER ST STE 100, Oakland, CA, 94602, USA), J. Moldon (Instituto de Astrofísica de Andalucía), T. W. B. Muxlow (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), M. Pahari (Department of Physics, Indian Institute of Technology, Hyderabad 502285, India), N. H. Wrigley (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), A. Alberdi (Instituto de Astrofísica de Andalucía), W. Baan (Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China, Netherlands Institute for Radio Astronomy), A. Beri (Indian Institute of Science Education and Research, School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK, Indian Institute of Astrophysics, Koramangala II Block, Bangalore 560034, India), X. Cheng (Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Korea), D. A. Green (Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK), J. Healy (United Kingdom SKA Regional Centre, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), P. Kharb (National Centre for Radio Astrophysics), E. Körding (Department of Astrophysics/IMAPP, Radboud University, P.O. Box 9010, 6500GL Nijmegen, The Netherlands), G. Lucatelli (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), F. Panessa (INAF - Istituto di Astrofisica e Planetologia Spaziali, via Fosso del Cavaliere 100, I-00133 Roma, Italy), M. Puig-Subirà (Instituto de Astrofísica de Andalucía), C. Romero-Cañizales (Institute of Astronomy and Astrophysics, Academia Sinica, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sec. 4, Roosevelt Rd, Taipei 106319, Taiwan), D. J. Saikia (Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany, Assam Don Bosco University, Guwahati 781017, Assam, India), P. Saikia (Center for Astro, Particle and Planetary Physics, Department of Astronomy, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA), F. Shankar (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), S. Sharma (Department of Physics, Indian Institute of Technology, Hyderabad 502285, India), I. R. Stevens (School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK), E. Varenius (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK)Tue, 10 Ma🔭 astro-ph

A GPU-Accelerated Transient Detection Pipeline for DECam Time-Domain Surveys

This paper presents a GPU-accelerated transient detection pipeline for DECam time-domain surveys that integrates image differencing and CNN-based classification to achieve real-time processing, high completeness in identifying real transients, and efficient artifact rejection for rapid scientific discovery.

Lei Hu, Tomás Cabrera, Antonella Palmese, Lifan Wang, Igor Andreoni, Xander J. Hall, Xingzhuo Chen, Jiawen Yang, Frank Valdes, Brendan O'Connor, Yuhan ChenTue, 10 Ma🔭 astro-ph

Interpretable and physics-informed emulator for the linear matter power spectrum from machine learning

This paper presents an interpretable, physics-informed emulator based on symbolic regression and genetic algorithms that generates compact, closed-form analytic expressions for the linear matter power spectrum in both Λ\LambdaCDM and modified gravity cosmologies, achieving sub-percent accuracy while offering a transparent alternative to traditional black-box emulators for large-scale structure analysis.

J. Bayron Orjuela-Quintana, Domenico Sapone, Savvas NesserisThu, 12 Ma🔭 astro-ph

A spinodal decomposition model for the large-scale structure of the universe

This paper proposes a novel thermodynamic framework for cosmic structure formation based on the Cahn-Hilliard model of spinodal decomposition, treating the universe as a binary fluid of matter and dark energy, which successfully reproduces key large-scale structure observables like void fractions and filamentarity while offering a computationally efficient alternative to traditional N-body simulations.

Nitish YadavThu, 12 Ma🔭 astro-ph

Disentangling the galactic and intergalactic components in 313 observed Lyman-alpha line profiles between redshift 0 and 5

Using the zELDA code to analyze 313 Lyman-alpha spectra, this study disentangles galactic and intergalactic effects to reveal that intrinsic galactic line profiles remain remarkably stable from redshift 0 to 6, while the intergalactic medium's transmission efficiency drops significantly at higher redshifts, eventually dominating Lyman-alpha observability beyond z≈5z \approx 5.

Siddhartha Gurung-López, Chris Byrohl, Max Gronke, Daniele Spinoso, Alberto Torralba, Alberto Fernández-Soto, Pablo Arnalte-Mur, Vicent J. MartínezThu, 12 Ma🔭 astro-ph

Broken Expectations: The Effects of Modelling Assumptions on the Inferred Dark Matter Distribution in the Milky Way's Satellites

This study uses tailored simulations of Milky Way satellites to demonstrate that while Galactic tides have minimal impact on dark matter density inference, the standard Jeans analysis method tends to underestimate inner densities and J-factors due to model limitations, and the consistency of results with cosmological predictions suggests either a light Milky Way or restricted tidal effects.

Kristian Tchiorniy, Anna GeninaThu, 12 Ma🔭 astro-ph

Sensitivity of the Global 21-cm Signal to Dark Matter-Baryon Scattering

This paper employs Fisher analysis to demonstrate that global 21-cm signal experiments, including current facilities like EDGES and SARAS3, can significantly improve constraints on dark matter-baryon scattering in Coulomb-like and velocity-independent models, while highlighting critical degeneracies between interaction cross sections and specific astrophysical parameters that must be carefully characterized to accurately probe dark matter physics.

Aryan Rahimieh, Priyank Parashari, Rui An, Trey Driskell, Jordan Mirocha, Vera GluscevicThu, 12 Ma🔭 astro-ph