Doublets and Double Peaks: Late-Time [O I] 6300, 6364 Line Profiles of Stripped-Envelope, Core-Collapse Supernovae

Details Doublets and Double Peaks: Late-Time [O I] 6300, 6364 Line Profiles of Stripped-Envelope, Core-Collapse Supernovae Doublets and Double Peaks: Late-Time [O I] 6300, 6364 Line Profiles of Stripped-Envelope, Core-Collapse Supernovae

2009-04-27

arxiv.org/abs/0904.4256v2

Astrophys.J.709:1343-1355,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

15 pages, 10 figures; new data and revisions to text and figures; matches version to be published in ApJ

Scientific paper

10.1088/0004-637X/709/2/1343

We present optical spectra of SN 2007gr, SN 2007rz, SN 2007uy, SN 2008ax, and SN 2008bo obtained in the nebular phase when line profiles can lead to information about the velocity distribution of the exploded cores. We compare these to 13 other published spectra of stripped-envelope core-collapse supernovae (Type IIb, Ib, and Ic) to investigate properties of their double-peaked [O I] 6300, 6364 emission. These 18 supernovae are divided into two empirical line profile types: (1) profiles showing two conspicuous emission peaks nearly symmetrically centered on either side of 6300 Angstroms and spaced approximately 64 Angstroms apart, close to the wavelength separation between the [O I] 6300, 6364 doublet lines, and (2) profiles showing asymmetric [O I] line profiles consisting of a pronounced emission peak near 6300 Angstroms plus one or more blueshifted emission peaks. Examination of these emission profiles, as well as comparison with profiles in the lines of [O I] 5577, O I 7774, and Mg I] 4571, leads us to conclude that neither type of [O I] double-peaked profile is necessarily the signature of emission from front and rear faces of ejecta arranged in a toroidal disk or elongated shell geometry as previously suggested. We propose possible alternative interpretations of double-peaked emission for each profile type, test their feasibility with simple line-fitting models, and discuss their strengths and weaknesses. The underlying cause of the observed predominance of blueshifted emission peaks is unclear, but may be due to internal scattering or dust obscuration of emission from far side ejecta.

Affiliated with

Also associated with

No associations

Rating

Doublets and Double Peaks: Late-Time [O I] 6300, 6364 Line Profiles of Stripped-Envelope, Core-Collapse Supernovae 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 Doublets and Double Peaks: Late-Time [O I] 6300, 6364 Line Profiles of Stripped-Envelope, Core-Collapse Supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Doublets and Double Peaks: Late-Time [O I] 6300, 6364 Line Profiles of Stripped-Envelope, Core-Collapse Supernovae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-712465