Results 81 to 90 of about 8,434 (211)

The type Ib supernova 1984L in NGC 991

The Astronomical Journal, 1989
SN 1984L in NGC 991 is a temporarily unique object for the Type Ib subclass of supernovae. It remains the only “fully” observed SN Ib to date, where “fully” means photometry and spectroscopy at early and late times.
Eric M. Schlegel, Robert P. Kirshner
openaire   +1 more source

Solvatomorphism in a series of copper(II) complexes with the 5‐phenylimidazole/perchlorate system as ligands

Acta Crystallographica Section B, Volume 80, Issue 4, Page 347-359, August 2024.
The reactions of Cu(ClO4)2·6H2O and L′H in a variety of solvents have provided access to 12 solvatomorphs of the general formula [Cu(ClO4)2(LH)4]·x(solvent); the effect of the solvents on the packing of the complexes is critically discussed.In the course of an investigation of the supramolecular behaviour of copper(II) complexes with the 5 ...
Edward Loukopoulos, Constantina Papatriantafyllopoulou, Eleni Moushi, Alexandros A. Kitos, Anastasios J. Tasiopoulos, Spyros P. Perlepes, Vassilios Nastopoulos   +6 more
wiley   +1 more source

Double “acct”: A Distinct Double-peaked Supernova Matching Pulsational Pair Instability Models

The Astrophysical Journal Letters
We present multiwavelength data of SN 2020acct, a double-peaked stripped-envelope supernova (SN) in NGC 2981 at ∼150 Mpc. The two peaks are temporally distinct, with maxima separated by 58 rest-frame days and a factor of 20 reduction in flux between. The
C. R. Angus, S. E. Woosley, R. J. Foley, M. Nicholl, V. A. Villar, K. Taggart, M. Pursiainen, P. Ramsden, S. Srivastav, H. F. Stevance, T. Moore, K. Auchettl, W. B. Hoogendam, N. Khetan, S. K. Yadavalli, G. Dimitriadis, A. Gagliano, M. R. Siebert, A. Aamer, T. de Boer, K. C. Chambers, A. Clocchiatti, D. A. Coulter, M. R. Drout, D. Farias, M. D. Fulton, C. Gall, H. Gao, L. Izzo, D. O. Jones, C.-C. Lin, E. A. Magnier, G. Narayan, E. Ramirez-Ruiz, C. L. Ransome, A. Rest, S. J. Smartt, K. W. Smith   +37 more
doaj   +1 more source

Classifying Astronomical Transients Using Only Host Galaxy Photometry

The Astrophysical Journal, 2023
The Legacy Survey of Space and Time (LSST) at the Vera C. Rubin Observatory will discover tens of thousands of extragalactic transients each night. The high volume of alerts demands immediate classification of transient types in order to prioritize ...
Marina Kisley, Yu-Jing Qin, Ann Zabludoff, Kobus Barnard, Chia-Lin Ko   +4 more
doaj   +1 more source

The connection between Gamma-ray bursts and Supernovae Ib/c

, 2007
It has been established that Gamma-Ray Bursts (GRBs) are connected to Supernovae (SNe) explosions of Type Ib/c. We intend to test whether the hypothesis of Type Ib/c SNe from different massive progenitors can reproduce the local GRB rate as well as the ...
Arimoto, Baron, Bertola, Bloom, Brown, Campana, Cappellaro, Casertano, Chiosi, Chugai, Conselice, Deng, E. Bissaldi, Efron, Elias, F. Calura, F. Longo, F. Matteucci, Filippenko, Firmani, Frail, Fruchter, G. Barbiellini, Galama, Giavalisco, Gratton, Guetta, Hjorth, Iwamoto, Jeffries, Jimenez, Kennicutt, Kroupa, Langer, Larson, Lynde-Bell, Maeder, Malesani, Mannucci, Matsubayashi, Matteucci, Matteucci, Matteucci, Mazzali, Mazzali, Mirabel, Mobasher, Modjaz, Muller, Murakami, Nakamura, Natarajan, Nomoto, Norman, Paczyǹski, Padoan, Podsiadlowski, Podsiadlowski, Salpeter, Sari, Sauer, Scalo, Schechter, Schmidt, Soderberg, Sokolov, Staguhn, Stanek, Strolger, Tinsley, van der Kruit, Vangioni-Flam, Woosley, Woosley, Yonetoku, Yoon, Zhang, Zwicky   +77 more
core   +2 more sources

Stratified learning: A general‐purpose statistical method for improved learning under covariate shift

Statistical Analysis and Data Mining: The ASA Data Science Journal, Volume 17, Issue 1, February 2024.
Abstract We propose a simple, statistically principled, and theoretically justified method to improve supervised learning when the training set is not representative, a situation known as covariate shift. We build upon a well‐established methodology in causal inference and show that the effects of covariate shift can be reduced or eliminated by ...
Maximilian Autenrieth, David A. van Dyk, Roberto Trotta, David C. Stenning   +3 more
wiley   +1 more source

The Transitional Stripped-Envelope SN 2008ax: Spectral Evolution and Evidence for Large Asphericity [PDF]

, 2011
Supernova (SN) 2008ax in NGC 4490 was discovered within hours after shock breakout, presenting the rare opportunity to study a core-collapse SN beginning with the initial envelope-cooling phase immediately following shock breakout.
A. L. Malec, A. M. Wolfe, A. Stockton, A. V. Filippenko, Arbour, Baron, Benetti, Benetti, Berger, Blondin, Blondin, Branch, C. E. Woodward, Chevalier, Chornock, Chornock, Chugai, Clocchiatti, Cropper, D. K. Lynch, Deng, Dessart, E. C. Moran, Fesen, Fesen, Folatelli, G. D. Becker, G. H. Marion, Hamuy, Hamuy, Heger, Howell, Hughes, Hwang, Höflich, J. M. Silverman, James, Jenniskens, Kasen, Leonard, Leonard, Leonard, Lewis, Li, M. Modjaz, M. Rafelski, M. T. Murphy, Maeda, Malesani, Marion, Marion, Matheson, Matheson, Matheson, Matthews, Matzner, Maund, Maund, Maund, Mazzali, Meikle, Menzies, Milisavljevic, Miller, Miller, Modjaz, Modjaz, Mostardi, Munari, Müller, P. Garnavich, Qiu, Quimby, R. A. Jorgenson, R. Chornock, R. J. Foley, R. J. Rudy, R. W. Russell, Rest, Rest, Roming, Ryder, Schlegel, Smith, Soderberg, Stritzinger, Stritzinger, T. N. Steele, Tanaka, Tominaga, Tsvetkov, Valenti, W. H. de Vries, W. Li, Wang, Wheeler, Wheeler   +96 more
core   +3 more sources

The Origins of Calcium-rich Supernovae From Disruptions of CO White Dwarfs by Hybrid He–CO White Dwarfs

The Astrophysical Journal, 2023
Calcium-rich explosions are very faint ( M _B ∼ −15.5), type I supernovae (SNe) showing strong Ca lines, mostly observed in old stellar environments. Several models for such SNe have been explored and debated, but none were able to reproduce consistently
Yossef Zenati, Hagai B. Perets, Luc Dessart, Wynn V. Jacobson-Galán, Silvia Toonen, Armin Rest   +5 more
doaj   +1 more source

The Supernova-Gamma Ray Burst Connection [PDF]

, 1998
Supernovae 1998bw and its corresponding relativistically expanding radio source are coincident with the \grb source GRB 980425. We show that of six recent SN Ib/c for which an outburst epoch can be estimated with some reliability, four have radio ...
J. Craig Wheeler, Lifan Wang, Thompson C.   +2 more
core   +3 more sources

Large Cold Dust Reservoir Revealed in Transitional SN Ib 2014C by James Webb Space Telescope Mid-infrared Spectroscopy

The Astrophysical Journal
Supernova (SN) 2014C is a rare transitional event that exploded as a hydrogen-poor, helium-rich Type Ib SN and subsequently interacted with a hydrogen-rich circumstellar medium (CSM) a few months postexplosion.
Samaporn Tinyanont, Ori D. Fox, Melissa Shahbandeh, Tea Temim, Robert Williams, Kittipong Wangnok, Armin Rest, Ryan M. Lau, Keiichi Maeda, Jacob E. Jencson, Katie Auchettl, Alexei V. Filippenko, Conor Larison, Chris Ashall, Thomas G. Brink, Kyle W. Davis, Luc Dessart, Ryan J. Foley, Lluís Galbany, Matthew Grayling, Joel Johansson, Mansi M. Kasliwal, Zachary G. Lane, Natalie LeBaron, Dan Milisavljevic, Jeonghee Rho, Itsuki Sakon, Arkaprabha Sarangi, Tamás Szalai, Kirsty Taggart, Schuyler D. Van Dyk, Qinan Wang, Yi Yang, WeiKang Zheng, Szanna Zsíros   +34 more
doaj   +1 more source