Results 71 to 80 of about 7,219,823 (215)

Stellar Properties of Observed Stars Stripped in Binaries in the Magellanic Clouds

The Astrophysical Journal, 2023
Massive stars (∼8–25 M _⊙ ) stripped of their hydrogen-rich envelopes via binary interaction are thought to be the main progenitors for merging neutron stars and stripped-envelope supernovae.
Y. Götberg, M. R. Drout, A. P. Ji, J. H. Groh, B. A. Ludwig, P. A. Crowther, N. Smith, A. de Koter, S. E. de Mink   +8 more
doaj   +1 more source

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

A LUMINOUS AND FAST-EXPANDING TYPE Ib SUPERNOVA SN 2012au [PDF]

The Astrophysical Journal, 2013
We present a set of photometric and spectroscopic observations of a bright Type Ib supernova SN 2012au from -6d until ~+150d after maximum. The shape of its early R-band light curve is similar to that of an average Type Ib/c supernova. The peak absolute magnitude is M_R=-18.7+-0.2 mag, which suggests that this supernova belongs to a very luminous group
Takaki, K., Kawabata, K. S., Yamanaka, M., Maeda, K., Tanaka, M., Akitaya, H., Fukazawa, Y., Itoh, R., Kinugasa, K., Moritani, Y., Ohsugi, T., Sasada, M., Uemura, M., Ueno, I., Ui, T., Urano, T., Yoshida, M., Nomoto, K.   +17 more
openaire   +2 more sources

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

Progenitor masses of Type Ib/c supernovae [PDF]

Monthly Notices of the Royal Astronomical Society, 1992
Recent models for the origins of Type Ib/c supernovae have proposed that the progenitors consist of relatively low-mass (M ∼ 12-18 M ⊙ ) stars in binary systems that have lost their hydrogen envelope. On the basis of the nickel mass, light curve and the amount of mixing, these models identify the low-mass end with Ic's and the higher mass end with Ib's.
openaire   +1 more source

Direct Analysis of Spectra of Type Ib Supernovae [PDF]

The Astrophysical Journal, 2002
Synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW are compared to photospheric-phase spectra of Type Ib supernovae (SNe Ib). Although the synthetic spectra are based on many simplifying approximations, including spherical symmetry, they account well for the observed spectra.
David Branch, S. Benetti, Daniel Kasen, E. Baron, David J. Jeffery, Kazuhito Hatano, R. A. Stathakis, Alexei V. Filippenko, Thomas Matheson, A. Pastorello, G. Altavilla, E. Cappellaro, L. Rizzi, M. Turatto, Weidong Li, Douglas C. Leonard, Joseph C. Shields   +16 more
openaire   +3 more sources

Progenitors and Hydrodynamics of Type II and lb Supernovae [PDF]

International Astronomical Union Colloquium, 1996
We review critical physics affecting the observational characteristics of those supernovae that occur in massive stars. Particular emphasis is given to 1) how mass loss, either to a binary companion or by a radiatively driven wind, affects the type and light curve of the supernova, and 2) the interaction of the outgoing supernova shock with regions of ...
S. E. Woosley, T. A. Weaver, R. G. Eastman   +2 more
openaire   +1 more source

A Search for Extragalactic Fast Blue Optical Transients in ZTF and the Rate of AT2018cow-like Transients

The Astrophysical Journal, 2023
We present a search for extragalactic fast blue optical transients (FBOTs) during Phase I of the Zwicky Transient Facility (ZTF). We identify 38 candidates with durations above half-maximum light 1 day < t _1/2 < 12 days, of which 28 have blue ( g − r ≲ −
Anna Y. Q. Ho, Daniel A. Perley, Avishay Gal-Yam, Ragnhild Lunnan, Jesper Sollerman, Steve Schulze, Kaustav K. Das, Dougal Dobie, Yuhan Yao, Christoffer Fremling, Scott Adams, Shreya Anand, Igor Andreoni, Eric C. Bellm, Rachel J. Bruch, Kevin B. Burdge, Alberto J. Castro-Tirado, Aishwarya Dahiwale, Kishalay De, Richard Dekany, Andrew J. Drake, Dmitry A. Duev, Matthew J. Graham, George Helou, David L. Kaplan, Viraj Karambelkar, Mansi M. Kasliwal, Erik C. Kool, S. R. Kulkarni, Ashish A. Mahabal, Michael S. Medford, A. A. Miller, Jakob Nordin, Eran Ofek, Glen Petitpas, Reed Riddle, Yashvi Sharma, Roger Smith, Adam J. Stewart, Kirsty Taggart, Leonardo Tartaglia, Anastasios Tzanidakis, Jan Martin Winters   +42 more
doaj   +1 more source

On the stellar progenitor of the type Ib supernova 1984L

The Astrophysical Journal, 1993
Photometric and spectroscopic data on the Type Ib SN 1984L and the probable Type Ib SN 1985F near maximum light and at late times appear to lead to contradictory conclusions. At early times a low mass and/or a high explosion energy is indicated, while at late times a high mass and/or a low explosion is indicated. Several possibilities for resolving the
E. Baron, Timothy R. Young, David Branch
openaire   +1 more source

Oxygen and helium in stripped-envelope supernovae [PDF]

, 2018
International audienceWe present an analysis of 507 spectra of 173 stripped-envelope (SE) supernovae (SNe) discovered by the untargeted Palomar Transient Factory (PTF) and intermediate PTF (iPTF) surveys. Our sample contains 55 Type IIb SNe (SNe IIb), 45
C. Fremling, C. Saunders, Perley, DA, Cenko, S.B., Horesh, A., M. Ergon, Quimby, R.M., Kasliwal, M.M., Kulkarni, SR, De Cia, A., D. A. Perley, C. Barbarino, Kuesters, D., Fremling, C., Karamehmetoglu, E., Filippenko, A, Karamehmetoglu, E, De Cia, A, Sollerman, J, G. Hosseinzadeh, T. Matheson, Graham, M.L., Cenko, SB, Filippenko, AV, S. B. Cenko, Fremling, C, A. Horesh, Quimby, RM, Nugent, PE, D. Kuesters, J. Sollerman, Horesh, A, Filippenko, A.V., Kuesters, D, Saunders, C., Howell, DA, Kasliwal, MM, Taddia, F, Clubb, K, Barbarino, C, Taddia, F., Sollerman, J., A. De Cia, Hosseinzadeh, G, E. Karamehmetoglu, Lunnan, R., F. Taddia, Gal-Yam, A, Duggan, G, Duggan, G., G. Duggan, Clubb, K., Arcavi, I, M. M. Kasliwal, Perley, D.A., Kulkarni, S.R., A. V. Filippenko, R. M. Quimby, De, A, M. L. Graham, Saunders, C, S. R. Kulkarni, Nugent, P.E., Hosseinzadeh, G., R. Lunnan, Ergon, M., A. Gal-Yam, Ergon, M, Lunnan, R, Matheson, T, Gal-Yam, A., P. E. Nugent, D. A. Howell, Matheson, T., Howell, D.A., K. Clubb, Arcavi, I., I. Arcavi, Barbarino, C., Graham, ML, Kasliwal, M. M., Nugent, P. E., Ergon, Mattias,, Lunnan, Ragnhild,, Graham, M. L., Karamehmetoglu, Emir,, Kulkarni, S. R., Filippenko, A., Sollerman, Jesper,, Perley, D. A., Taddia, Francesco,, Quimby, R. M., Cenko, S. B., Fremling, Christoffer,, Barbarino, Cristina,, Howell, D. A.   +95 more
core   +1 more source