Results 91 to 100 of about 13,120 (212)

Optical Photometry of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex in IC 5179 [PDF]

, 2002
We present UBVRIz lightcurves of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex, both located in the galaxy IC 5179. SN 1999ee has an extremely well sampled lightcurve spanning from 10 days before Bmax through 53 days after peak.
A. C. Becker, Barbon R., Branch D., Christopher Stubbs, David González, Eric P. Rubenstein, Gaspar Galaz, José Maza, Juan Espinoza, L.-G. Strolger, Leibundgut B., Luis González, M. M. Phillips, Marina Wischnjewsky, Mario Hamuy, Maximilian Stritzinger, Menzies J. W., Munari U., Nicholas B. Suntzeff, Pablo Candia, R. C. Smith, Roberto Antezana, Strolger L. G.   +22 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

Light Element Production in the Circumstellar Matter of Energetic Type Ic Supernovae

, 2006
We investigate energetic type Ic supernovae as production sites for Li6 and Be in the early stages of the Milky Way. Recent observations have revealed that some very metal-poor stars with [Fe/H]
Cayrel R., D’Antona F., Ko Nakamura, Meneguzzi M., Nath B. B., Primas F., Primas F., Shinya Wanajo, Spite F., Susumu Inoue, Toshikazu Shigeyama   +10 more
core   +1 more source

Phylogenomic analysis of protein‐coding genes resolves complex gall wasp relationships

Systematic Entomology, Volume 49, Issue 1, Page 110-137, January 2024.
We present the first phylogenomic analysis of gall wasp relationships (Hymenoptera: Cynipidae) based on protein‐coding sequence data from genome and transcriptome assemblies. Our results confirm previous analyses of ultra‐conserved elements, suggesting that the family falls into three lineages, recognized here as separate families: Cynipidae (s. str.),
Jack Hearn, Erik Gobbo, José Luis Nieves‐Aldrey, Antoine Branca, James A. Nicholls, Georgios Koutsovoulos, Nicolas Lartillot, Graham N. Stone, Fredrik Ronquist   +8 more
wiley   +1 more source

Direct Analysis of Spectra of the Type Ic Supernova SN 1994I [PDF]

The Astrophysical Journal, 1999
Synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW are compared to observed photospheric-phase spectra of the Type Ic supernova 1994I. The observed optical spectra can be well matched by synthetic spectra that are based on the assumption of spherical symmetry.
Millard, J., Branch, D., Baron, E., Hatano, K., Fisher, A., Filippenko, A., Kirshner, R., Challis, P., Fransson, C., Panagia, N., Phillips, M., Sonneborn, G., Suntzeff, N., Wagoner, R., Wheeler, J.   +14 more
openaire   +2 more sources

Probing Presupernova Mass Loss in Double-peaked Type Ibc Supernovae from the Zwicky Transient Facility

The Astrophysical Journal
Eruptive mass loss of massive stars prior to supernova (SN) explosion is key to understanding their evolution and end fate. An observational signature of pre-SN mass loss is the detection of an early, short-lived peak prior to the radioactive-powered ...
Kaustav K. Das, Mansi M. Kasliwal, Jesper Sollerman, Christoffer Fremling, I. Irani, Shing-Chi Leung, Sheng Yang, Samantha Wu, Jim Fuller, Shreya Anand, Igor Andreoni, C. Barbarino, Thomas G. Brink, Kishalay De, Alison Dugas, Steven L. Groom, George Helou, K-Ryan Hinds, Anna Y. Q. Ho, Viraj Karambelkar, S. R. Kulkarni, Daniel A. Perley, Josiah Purdum, Nicolas Regnault, Steve Schulze, Yashvi Sharma, Tawny Sit, Niharika Sravan, Gokul P. Srinivasaragavan, Robert Stein, Kirsty Taggart, Leonardo Tartaglia, Anastasios Tzanidakis, Avery Wold, Lin Yan, Yuhan Yao, Jeffry Zolkower   +36 more
doaj   +1 more source

The origin of single radio pulsars

, 1999
By comparing relative rates of supernovae versus formation rates of single radio pulsars, recycled pulsars, binary pulsars and X-ray binaries we put strong limits on the progenitors of radio pulsars and on the requirement of an asymmetry in the supernova.
Heuvel, Edward van den, Zwart, Simon Portegies   +1 more
core   +2 more sources

Explaining Nonmerger Gamma-Ray Bursts and Broad-lined Supernovae with Close Binary Progenitors with Black Hole Central Engines

The Astrophysical Journal
For over 25 yr, the origin of long-duration gamma-ray bursts (lGRBs) has been linked to the collapse of rotating massive stars. However, we have yet to pinpoint the stellar progenitor powering these transients.
Christopher L. Fryer, Eric Burns, Anna Y. Q. Ho, Alessandra Corsi, Amy Y. Lien, Daniel A. Perley, Jada L. Vail, V. Ashley Villar   +7 more
doaj   +1 more source

SN 2022oqm–A Ca-rich Explosion of a Compact Progenitor Embedded in C/O Circumstellar Material

The Astrophysical Journal
We present the discovery and analysis of SN 2022oqm, a Type Ic supernova (SN) detected
Ido Irani, Ping Chen, Jonathan Morag, Steve Schulze, Avishay Gal-Yam, Nora L. Strotjohann, Ofer Yaron, Erez A. Zimmerman, Amir Sharon, Daniel A. Perley, J. Sollerman, Aaron Tohuvavohu, Kaustav K. Das, Mansi M. Kasliwal, Rachel Bruch, Thomas G. Brink, WeiKang Zheng, Alexei V. Filippenko, Kishore C. Patra, Sergiy S. Vasylyev, Yi Yang, Matthew J. Graham, Joshua S. Bloom, Paolo Mazzali, Josiah Purdum, Russ R. Laher, Avery Wold, Yashvi Sharma, Leander Lacroix, Michael S. Medford   +29 more
doaj   +1 more source

Analysis of Late--time Light Curves of Type IIb, Ib and Ic Supernovae

, 2015
The shape of the light curve peak of radioactive--powered core--collapse "stripped--envelope" supernovae constrains the ejecta mass, nickel mass, and kinetic energy by the brightness and diffusion time for a given opacity and observed expansion velocity.
Clocchiatti, A., Johnson, V., Wheeler, J. Craig   +2 more
core   +1 more source