Spectroscopic observations of sn 2012fr: A luminous, normal type Ia supernova with early high-velocity features and a late velocity plateau
Article
Article Title | Spectroscopic observations of sn 2012fr: A luminous, normal type Ia supernova with early high-velocity features and a late velocity plateau |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Childress, M.J. (Author), Scalzo, R.A. (Author), Sim, S.A. (Author), Tucker, B.E. (Author), Yuan, F. (Author), Schmidt, B.P. (Author), Cenko, S.B. (Author), Silverman, J.M. (Author), Contreras, C. (Author), Hsiao, E.Y. (Author), Phillips, M. (Author), Morrell, N. (Author), Jha, S.W. (Author), McCully, C. (Author), Filippenko, A.V. (Author), Anderson, J.P. (Author), Benetti, S. (Author), Bufano, F. (Author), de Jaeger, T. (Author), Forster, F. (Author), Gal-Yam, A. (Author), Le Guillou, L. (Author), Maguire, K. (Author), Maund, J. (Author), Mazzali, P.A. (Author), Pignata, G. (Author), Smartt, S. (Author), Spyromilio, J. (Author), Sullivan, M. (Author), Taddia, F. (Author), Valenti, S. (Author), Bayliss, D.D.R. (Author), Bessell, M. (Author), Blanc, G.A. (Author), Carson, D.J. (Author), Clubb, K.I. (Author), de Burgh-Day, C. (Author), Desjardins, T.D. (Author), Fang, J.J. (Author), Fox, O.D. (Author), Gates, E.L. (Author), Ho, I.-T. (Author), Keller, S. (Author), Kelly, P.L. (Author), Lidman, C. (Author), Loaring, N.S. (Author), Mould, J.R. (Author), Owers, M. (Author), Ozbilgen, S. (Author), Pei, L. (Author), Pickering, T. (Author), Pracy, M.B. (Author), Rich, J.A. (Author), Schaefer, B.E. (Author), Scott, N. (Author), Stritzinger, M. (Author), Vogt, F.P.A. (Author) and Zhou, G. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 770 (1), pp. 1-20 |
Article Number | 29 |
Number of Pages | 20 |
Year | 2013 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stt813 |
Web Address (URL) | https://iopscience.iop.org/article/10.1088/0004-637X/770/1/29 |
Abstract | We present 65 optical spectra of the Type Ia SN 2012fr, 33 of which were obtained before maximum light. At early times, SN 2012fr shows clear evidence of a high-velocity feature (HVF) in the Si lambda 6355 line that can be cleanly decoupled from the lower velocity 'photospheric' component. This Si lambda 6355 HVF fades by phase - 5; subsequently, the photospheric component exhibits a very narrow velocity width and remains at a nearly constant velocity of similar to 12,000 km s(-1) until at least five weeks after maximum brightness. The Ca II infrared triplet exhibits similar evidence for both a photospheric component at v approximate to 12,000 km s(-1) with narrow line width and long velocity plateau, as well as an HVF beginning at v approximate to 31,000 km s(-1) two weeks before maximum. SN 2012fr resides on the border between the 'shallow silicon' and 'core-normal' subclasses in the Branch et al. classification scheme, and on the border between normal and high-velocity Type Ia supernovae (SNe Ia) in the Wang et al. system. Though it is a clear member of the 'low velocity gradient' group of SNe Ia and exhibits a very slow light-curve decline, it shows key dissimilarities with the overluminous SN 1991T or SN 1999aa subclasses of SNe Ia. SN 2012fr represents a well-observed SN Ia at the luminous end of the normal SN Ia distribution and a key transitional event between nominal spectroscopic subclasses of SNe Ia. |
Keywords | galaxies: individual (NGC 1365); supernovae: general; supernovae: individual (SN 2012fr) |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Australian National University |
University of California, United States | |
University of Texas, United States | |
Las Campanas Observatory, Chile | |
Rutgers University, United States | |
University of Chile, Chile | |
National Institute for Astrophysics, Italy | |
Andres Bello National University, Chile | |
Weizmann Institute of Science, Israel | |
Sorbonne University, France | |
University of Oxford, United Kingdom | |
Queen's University Belfast, United Kingdom | |
European Southern Observatory (ESO), Chile | |
University of Southampton, United Kingdom | |
Stockholm University, Sweden | |
Las Cumbres Observatory, United States | |
Carnegie Institution of Washington, United States | |
University of Melbourne | |
University of Western Ontario, Canada | |
University of Hawaii, United States | |
Australian Astronomical Observatory, Australia | |
South African Astronomical Observatory, South Africa | |
Swinburne University of Technology | |
University of Sydney | |
Louisiana State University, United States | |
Aarhus University, Denmark | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6x3q/spectroscopic-observations-of-sn-2012fr-a-luminous-normal-type-ia-supernova-with-early-high-velocity-features-and-a-late-velocity-plateau
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