Direct Analysis of Spectra of the Unusual Type Ib Supernova 2005bf

Details Direct Analysis of Spectra of the Unusual Type Ib Supernova 2005bf Direct Analysis of Spectra of the Unusual Type Ib Supernova 2005bf

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915003p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #150.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Synthetic spectra are generated with the parameterized supernova (SN) synthetic-spectrum code SYNOW and are compared to spectra of the exceptionally interesting Type Ib SN 2005bf. By definition, Type Ib supernovae are those whose spectra display conspicuous helium lines and no hydrogen lines. We confirm the discovery by Folatelli et al. (2006) that very early spectra ( 30 days before maximum light) contain both photospheric-velocity ( 8000 km s-1) features of He I, Ca II, and Fe II as well as detached high-velocity features of Hα, Ca II, and Fe II. A comparison of an early spectrum of SN 2005bf to that of the Type Ib SN 1999ex clinches a previously suggested identification of Hα in SN 1999ex and supports the proposition that many if not all Type Ib supernovae eject a small amount of hydrogen. The resemblance of the earliest spectrum of SN 2005bf and a near-maximum-light spectrum of the Type Ic SN 1994I means that a reinterpretation of the spectra of Type Ic supernovae, involving coexisting photospheric-velocity and high-velocity features, should be explored. Implications of these results for the geometry of the SN 2005bf ejecta, which is thought to be highly asymmetrical, are discussed. This work has been supported by NSF grants AST-0204771 and AST-0506028, and NASA LTSA grant NNG04GD36G.

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