Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-11-17
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
12 pages, revised version accepted by ApJL
Scientific paper
The classic example of a Type IIb supernova is SN 1993J, which had a cool extended progenitor surrounded by a dense wind. There is evidence for another category of Type IIb supernova which has a more compact progenitor with a lower density, probably fast, wind. Distinguishing features of the compact category are: weak optical emission from the shock heated envelope at early times; nonexistent or very weak H emission in the late nebular phase; rapidly evolving radio emission; rapid expansion of the radio shell; and expected nonthermal as opposed to thermal X-ray emission. Type IIb supernovae that have one or more of these features include SNe 1996cb, 2001ig, 2003bg, 2008ax, and 2008bo. All of these with sufficient radio data (the last four) show evidence for presupernova wind variability. We estimate a progenitor envelope radius ~1e11 cm for SN 2008ax, a value consistent with a compact Wolf-Rayet progenitor. Supernovae in the SN 1993J extended category include SN 2001gd and probably the Cas A supernova. We suggest that the compact Type IIb events be designated Type cIIb and the extended ones Type eIIb. The H envelope mass dividing these categories is ~0.1 Msun.
Chevalier Roger A.
Soderberg Alicia Margarita
No associations
LandOfFree
Type IIB Supernovae with Compact and Extended Progenitors 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 Type IIB Supernovae with Compact and Extended Progenitors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Type IIB Supernovae with Compact and Extended Progenitors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-239979