Early Spectroscopic Identification of SN 2008D
2009 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 692, no 2, L84-L87 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2009. Vol. 692, no 2, L84-L87 p.
supernovae: individual (SN 2008D)
IdentifiersURN: urn:nbn:se:uu:diva-137352DOI: 10.1088/0004-637X/692/2/L84ISI: 000263149100005OAI: oai:DiVA.org:uu-137352DiVA: diva2:378221