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

2007-01-08

arxiv.org/abs/astro-ph/0701198v1

Astronomy and Astrophysics

Astrophysics

Accepted by PASP

Scientific paper

10.1086/512494

Synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW are compared to spectra of the unusual Type Ib supernova 2005bf. We confirm the discovery by Folatelli et al. (2006) that very early spectra (about 30 days before maximum light) contain both photospheric-velocity (8000 km/s) features of He I, Ca II, and Fe II, and detached high-velocity (14,000 km/s) features of H-alpha, Ca II, and Fe II. An early spectrum of SN 2005bf is an almost perfect match to a near-maximum-light spectrum of the Type Ib SN 1999ex. Although these two spectra were at very different times with respect to maximum light (20 days before maximum for SN 2005bf and five days after for SN 1999ex), they were for similar times after explosion - about 20 days for SN 2005bf and 24 days for SN 1999ex. The almost perfect match clinches the previously suggested identification of H-alpha in SN 1999ex and supports the proposition that many if not all Type Ib supernovae eject a small amount of hydrogen. The earliest available spectrum of SN 2005bf resembles a near-maximum-light spectrum of the Type Ic SN 1994I. These two spectra also were at different times with respect to maximum light (32 days before maximum for SN 2005bf and four days before for SN 1994I) but at similar times after explosion - about eight days for SN 2005bf and 10 days for SN 1994I. The resemblance motivates us to consider a reinterpretation of the spectra of Type Ic supernovae, involving coexisting photospheric-velocity and high-velocity features. The implications of our results for the geometry of the SN 2005bf ejecta, which has been suggested to be grossly asymmetric, are briefly discussed.

Affiliated with

Also associated with

No associations

Rating

Direct Analysis of Spectra of the Unusual Type Ib Supernova 2005bf does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Direct Analysis of Spectra of the Unusual Type Ib Supernova 2005bf, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct Analysis of Spectra of the Unusual Type Ib Supernova 2005bf will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-721591