(2009) Eearly spectroscopic identification of SN 2008D. Astrophysical Journal Letters, Vol.692 (No.2). L84-L87. doi:10.1088/0004-637X/692/2/L84

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Abstract

SN 2008D was discovered while following up an unusually bright X-ray transient (XT) in the nearby spiral galaxy NGC 2770. We present early optical spectra ( obtained 1.75 days after the XT) which allowed the first identification of the object as a supernova ( SN) at redshift z = 0.007. These spectra were acquired during the initial declining phase of the light curve, likely produced in the stellar envelope cooling after shock breakout, and rarely observed. They exhibit a rather flat spectral energy distribution with broad undulations, and a strong, W-shaped feature with minima at 3980 and 4190 angstrom ( rest frame). We also present extensive spectroscopy and photometry of the SN during the subsequent photospheric phase. Unlike SNe associated with gamma-ray bursts, SN 2008D displayed prominent He features and is therefore of Type Ib.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Astrophysical Journal Letters
Publisher:	IOP Publishing Ltd
ISSN:	2041-8205
Official Date:	20 February 2009
Dates:	Date Event 20 February 2009 Published
Volume:	Vol.692
Number:	No.2
Number of Pages:	4
Page Range:	L84-L87
DOI:	10.1088/0004-637X/692/2/L84
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	DNRF, Spanish research programs, EU, Icelandic Research Fund
Grant number:	AYA2004-01515, ESP2005-07714-C03-03, MEIF-CT2006-041363, PERG03-GA-2008-226653

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