Results 51 to 60 of about 621 (117)

GENERATION OF HIGH-ENERGY PHOTONS AT ULTRA-RELATIVISTIC SHOCK BREAKOUT IN SUPERNOVAE

The Astrophysical Journal, 2013
We present theoretical expectations for non-thermal emission due to the bulk Comptonization at the ultra-relativistic shock breakout. We calculate the transfer of photons emitted from the shocked matter with a Monte Carlo code fully taking into account special relativity.
Ohtani, Yukari, Suzuki, Akihiro, Shigeyama, Toshikazu   +2 more
openaire   +2 more sources

Investigating Galactic Cosmic Ray Ionization’s Contribution to Aerosol Formation on Neptune and a Potential Link to the Relationship Between Brightness and Solar Activity

Journal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract In this work we investigate how ionization from Galactic Cosmic Rays (GCRs) can affect aerosol nucleation on Neptune and discuss potential implications for the observed brightness variations that appear to follow the solar cycle. We calculate the planetary vertical cutoff rigidity for Neptune based on the O8 ${\mathrm{O}}_{8}$ magnetic field ...
Martin B. B. Enghoff, Paul N. Romani, John E. P. Connerney, John L. Jørgensen   +3 more
wiley   +1 more source

The Next Generation of Cosmological Measurements with Type Ia Supernovae

, 2019
Science White paper submitted to Astro2020 Decadal Survey.
Scolnic, Dan, Perlmutter, Saul, Aldering, Greg, Brout, Dillon, Davis, Tamara, Filippenko, Alex, Foley, Ryan, Hlozek, Renee, Hounsell, Rebekah, Jha, Saurabh, Jones, David, Kelly, Pat, Kessler, Rick, Kim, Alex, Rubin, David, Riess, Adam, Rodney, Steven, Roberts-Pierel, Justin, Stubbs, Christopher, Wang, Yun, Asorey, Jacobo, Avelino, Arturo, Bavdhankar, Chetan, Brown, Peter J., Challinor, Anthony, Balland, Christophe, Cooray, Asantha, Dhawan, Suhail, Dimitriadis, Georgios, Dvorkin, Cora, Guy, Julien, Handley, Will, Keeley, Ryan E., Kneib, Jean-Paul, LHuillier, Benjamin, Lattanzi, Massimiliano, Mandel, Kaisey, Mertens, James, Rigault, Mickael, Motloch, Pavel, Mukherjee, Suvodip, Narayan, Gautham, Nomerotski, Andrei, Page, Lyman, Pogosian, Levon, Puglisi, Giuseppe, Raveri, Marco, Regnault, Nicolas, Rest, Armin, Rojas-Bravo, Cesar, Sako, Masao, Shi, Feng, Sridhar, Srivatsan, Suzuki, Aritoki, Tsai, Yu-Dai, Wood-Vasey, W. M., Copin, Yannick, Zhao, Gong-Bo, Zhu, Ningfeng   +58 more
openaire   +2 more sources

Type Ia Supernovae from First-generation Stars

The Astrophysical Journal
Abstract Type Ia supernovae (SNe Ia) discovered at redshift z ≲ 2.5 are presumed to be produced from Population I/II stars. In this work, we investigate the production of SNe Ia from Population III binaries in the cosmological framework.
Zhenwei Li, Lifan Wang, Zhanwen Han, Xuefei Chen   +3 more
openaire   +3 more sources

Generation of Seed Magnetic Fields in Primordial Supernova Remnants

, 2009
Origin of the magnetic field ubiquitous in the Universe is studied based on the Biermann mechanism, which is expected to work in the non-barotropic region. We perform a series of two-dimensional MHD simulations of the first generation supernova remnant (SNR) expanding in the inhomogeneous interstellar matter (ISM) and study the Biermann mechanism ...
Hanayama, Hidekazu, Takahashi, Keitaro, Tomisaka, Kohji   +2 more
openaire   +2 more sources

Extending Supernova Spectral Templates for Next-generation Space Telescope Observations

Publications of the Astronomical Society of the Pacific, 2018
Empirical models of supernova (SN) spectral energy distributions (SEDs) are widely used for SN survey simulations and photometric classifications. The existing library of SED models has excellent optical templates but limited, poorly constrained coverage of ultraviolet (UV) and infrared (IR) wavelengths.
Pierel, JDR, Rodney, S, Avelino, A, Bianco, F, Filippenko, AV, Foley, RJ, Friedman, A, Hicken, M, Hounsell, R, Jha, SW, Kessler, R, Kirshner, RP, Mandel, K, Narayan, G, Scolnic, D, Strolger, L   +15 more
openaire   +2 more sources

Proton-generated MeV gamma-rays from supernova 1987A

The Astrophysical Journal, 1989
L'evolution temporelle de la desintegration de π o en rayons γ due a la cascade electromagnetique dans le materiel de l'enveloppe d'une supernova est ...
Todor Stanev, H. P. Vankov
openaire   +1 more source

SUPERNOVA: Eliciting General Reasoning in LLMs with Reinforcement Learning on Natural Instructions

CoRR
Reinforcement Learning with Verifiable Rewards (RLVR) has substantially improved reasoning in formal domains such as mathematics and code, but extending these gains beyond STEM remains challenging. Extending RLVR beyond STEM is fundamentally constrained by the lack of high-quality verifiable training data.
Ashima Suvarna, Kendrick Phan, Mehrab Beikzadeh, Hritik Bansal, Saadia Gabriel   +4 more
openaire   +3 more sources

Approximating General Relativity in Core-Collapse Supernova Simulations

We present formulations of effective potentials suitable for approximating general relativistic effects in Newtonian simulations of core-collapse supernovae. Assuming a spherically symmetric spacetime and a stress-energy tensor that includes both fluid and neutrino contributions, Eulerian and Lagrangian projections of the Einstein equations are made to
Fromm, Steven A., Mewes, Vassilios, Messer, O. E. Bronson, Lentz, Eric J., Hix, W. Raphael, Harris, J. Austin   +5 more
openaire   +2 more sources

Uncovering a population of gravitational lens galaxies with magnified standard candle SN Zwicky. [PDF]

Nat Astron, 2023
Goobar A, Johansson J, Schulze S, Arendse N, Carracedo AS, Dhawan S, Mörtsell E, Fremling C, Yan L, Perley D, Sollerman J, Joseph R, Hinds KR, Meynardie W, Andreoni I, Bellm E, Bloom J, Collett TE, Drake A, Graham M, Kasliwal M, Kulkarni SR, Lemon C, Miller AA, Neill JD, Nordin J, Pierel J, Richard J, Riddle R, Rigault M, Rusholme B, Sharma Y, Stein R, Stewart G, Townsend A, Vinko J, Wheeler JC, Wold A.   +37 more
europepmc   +1 more source