Malesani 2008 SN 2008D 的早期谱

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· arXiv e-print (arXiv:0805.1188)

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Title:		Early spectroscopic identification of SN 2008D
Authors:		Malesani, D.; Fynbo, J. P. U.; Hjorth, J.; Leloudas, G.; Sollerman, J.; Stritzinger, M. D.; Vreeswijk, P. M.; Watson, D. J.; Gorosabel, J.; Michałowski, M. J.; Thöne, C. C.; Augusteijn, T.; Bersier, D.; Jakobsson, P.; Jaunsen, A. O.; Ledoux, C.; Levan, A. J.; Milvang-Jensen, B.; Rol, E.; Tanvir, N. R.; Wiersema, K.; Xu, D.; Albert, L.; Bayliss, M.; Gall, C.; Grove, L. F.; Koester, B. P.; Leitet, E.; Pursimo, T.; Skillen, I.
Publication:		eprint arXiv:0805.1188
Publication Date:		05/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		6 pages, 5 figures, 4 tables; submitted to ApJ Letters
Bibliographic Code:		2008arXiv0805.1188M

Abstract

SN 2008D was discovered while following up a luminous, unusual X-ray transient in the nearby spiral galaxy NGC 2770. We present early spectra of the optical counterpart (1.77 days after the X-ray transient) which first allowed to identify the object as a supernova at redshift z = 0.007. These spectra were acquired during the initial declining phase of the light curve, likely due to the shock breakout. They show a relatively flat continuum with broad undulations, and a strong, W-shaped feature with minima at 3980 and 4190 AA (rest frame). We also present extensive spectroscopic and photometric monitoring of the supernova covering the photospheric phase. Unlike supernovae associated with gamma-ray bursts, SN 2008D displayed prominent He features and is therefore of Type Ib.

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