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SPECTROSCOPIC OBSER...
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Childress, M. J.
(författare)
SPECTROSCOPIC OBSERVATIONS OF SN 2012fr : A LUMINOUS, NORMAL TYPE Ia SUPERNOVA WITH EARLY HIGH-VELOCITY FEATURES AND A LATE VELOCITY PLATEAU
- Artikel/kapitelEngelska2013
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Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:su-92007
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-92007URI
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https://doi.org/10.1088/0004-637X/770/1/29DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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AuthorCount:58;A number of other funders
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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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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Scalzo, R. A.
(författare)
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Sullivan, M.
(författare)
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Taddia, FrancescaStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ftadd
(författare)
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Vogt, F. P. A.
(författare)
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Zhou, G.
(författare)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Astrophysical Journal770:1, s. 29-0004-637X1538-4357
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