期刊
ASTROPHYSICAL JOURNAL
卷 770, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/770/1/29
关键词
galaxies: individual (NGC 1365); supernovae: general; supernovae: individual (SN 2012fr)
资金
- Australian Research Council Centre of Excellence for All-sky Astrophysics (CAAS-TRO) [CE110001020]
- Australian Research Council Future Fellowship [FT0992259]
- CONICYT through FONDECYT grant [3110142]
- Millennium Center for Supernova Science [P10-064-F]
- EU/FP7 via an ERC grant
- FONDECYT [3120227]
- Programa Bicentenario de Ciencia y Tecnologia de CONICYT
- Programa Iniciativa Cientifica Milenio de MIDEPLAN
- PRIN-INAF
- project Transient Universe: from ESO Large to PESSTO
- NSF [AST-0847157, AST-1008343, AST-1211916, AST-0907903]
- Richard and Rhoda Goldman Fund
- Christopher R. Redlich Fund
- TABASGO Foundation
- W.M. Keck Foundation
- NASA
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1302771] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1008343, 1211916] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/I001123/1] Funding Source: researchfish
- STFC [ST/I001123/1] Funding Source: UKRI
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.
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