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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Spectroscopic observations of sn 2012fr: A luminous, normal type ia supernova with early high-velocity features and a late velocity plateau
Astrophysical Journal, Volume 770, No. 1, Article 29, Year 2013
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Description
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 II λ6355 line that can be cleanly decoupled from the lower velocity "photospheric" component. This Si II λ6355 HVF fades by phase -5; subsequently, the photospheric component exhibits a very narrow velocity width and remains at a nearly constant velocity of 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 12,000 km s-1 with narrow line width and long velocity plateau, as well as an HVF beginning at v 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. © 2013. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Childress, Michael J.
Australia, Canberra
The Australian National University
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Scalzo, Richard A.
Australia, Canberra
The Australian National University
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Sim, S. A.
Australia, Canberra
The Australian National University
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
United Kingdom, Belfast
Queen's University Belfast
Tucker, Bradley E.
Australia, Canberra
The Australian National University
Yuan, Fang
Australia, Canberra
The Australian National University
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Schmidt, Brian P.
Australia, Canberra
The Australian National University
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Cenko, Stephen Bradley
United States, Berkeley
University of California, Berkeley
Silverman, Jeffrey M.
United States, Austin
The University of Texas at Austin
Contreras, Carlos
Chile, La Serena
Las Campanas Observatory
Hsiao, Eric Y.
Chile, La Serena
Las Campanas Observatory
Phillips, Mark M.
Chile, La Serena
Las Campanas Observatory
Morrell, Nidia I.
Chile, La Serena
Las Campanas Observatory
Jha, Saurabh W.
United States, New Brunswick
Rutgers University–new Brunswick
McCully, Curtis V.
United States, New Brunswick
Rutgers University–new Brunswick
Filippenko, Alexei V.
United States, Berkeley
University of California, Berkeley
Anderson, Joseph P.
Chile, Santiago
Universidad de Chile
Benetti, Stefano
Italy, Padua
Osservatorio Astronomico Di Padova
Bufano, Filomena
Chile, Santiago
Universidad Andrés Bello
de Jaeger, Thomas
Chile, Santiago
Universidad de Chile
Förster, Francisco
Chile, Santiago
Universidad de Chile
Gal-Yam, Avishay
Israel, Rehovot
Weizmann Institute of Science Israel
Le Guillou, L.
France, Paris
Sorbonne Université
Maguire, K.
United Kingdom, Oxford
University of Oxford
Maund, Justyn R.
United Kingdom, Belfast
Queen's University Belfast
Mazzali, Paolo A.
Italy, Padua
Osservatorio Astronomico Di Padova
United Kingdom, Liverpool
Liverpool John Moores University
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Pignata, Giuliano
Chile, Santiago
Universidad Andrés Bello
Smartt, Stephen J.
United Kingdom, Belfast
Queen's University Belfast
Spyromilio, Jason
Germany, Garching Bei Munchen
European Southern Observatory
Sullivan, Mark
United Kingdom, Southampton
University of Southampton
Taddia, Francesco
Sweden, Stockholm
Stockholms Universitet
Valenti, Stefano
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
United States, Santa Barbara
University of California, Santa Barbara
Bayliss, Daniel D.R.
Australia, Canberra
The Australian National University
Bessell, Michael S.
Australia, Canberra
The Australian National University
Blanc, Guillermo A.
United States, Pasadena
Carnegie Observatories
Carson, Daniel J.
United States, Irvine
University of California, Irvine
Clubb, Kelsey I.
United States, Berkeley
University of California, Berkeley
De Burgh-Day, C.
Australia, Melbourne
University of Melbourne
Desjardins, Tyler D.
Canada, London
Western University
Fang, J. J.
United States, Mount Hamilton
Lick Observatory
Fox, Ori D.
United States, Berkeley
University of California, Berkeley
Gates, Elinor L.
United States, Mount Hamilton
Lick Observatory
Ho, I. Ting
United States, Honolulu
University Hawaii Institute for Astronomy
Keller, S.
Australia, Canberra
The Australian National University
Kelly, Patrick L.
United States, Berkeley
University of California, Berkeley
Lidman, Christopher E.
Australia
Australian Astronomical Observatory
Loaring, Nicola S.
South Africa, Cape Town
South African Astronomical Observatory
Mould, Jeremy R.
Australia, Hawthorn
Swinburne University of Technology
Owers, Matt S.
Australia
Australian Astronomical Observatory
Ozbilgen, S.
Australia, Melbourne
University of Melbourne
Pei, Liuyi
United States, Irvine
University of California, Irvine
Pickering, Timothy E.
South Africa, Cape Town
South African Astronomical Observatory
Pracy, Michael B.
Australia, Sydney
The University of Sydney
Rich, Jeffrey
United States, Pasadena
Carnegie Observatories
Schaefer, Bradley E.
United States, Baton Rouge
Louisiana State University
Scott, N.
Australia, Hawthorn
Swinburne University of Technology
Stritzinger, Maximilian D.
Denmark, Aarhus
Aarhus Universitet
Vogt, F. P.A.
Australia, Canberra
The Australian National University
Zhou, George
Australia, Canberra
The Australian National University
Statistics
Citations: 58
Authors: 58
Affiliations: 32
Identifiers
Doi:
10.1088/0004-637X/770/1/29
ISSN:
0004637X
e-ISSN:
15384357