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Spectropolarimetry of Core-Collapse Supernovae

Leonard, D. C. and Filippenko, A. V. (2005) Spectropolarimetry of Core-Collapse Supernovae. In: 1604-2004: Supernovae as Cosmological Lighthouses. ASP Conference Series. No.342. Astronomical Society of the Pacific , San Francisco, CA, pp. 330-336. ISBN 1-58381-209-1.

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We briefly review the young field of spectropolarimetry of core-collapse supernovae (SNe). Spectropolarimetry provides the only direct known probe of early-time supernova (SN) geometry. The fundamental result is that asphericity is a ubiquitous feature of young core-collapse SNe. However, the nature and degree of the asphericity vary considerably. The best predictor of core-collapse SN polarization seems to be the mass of the hydrogen envelope that is intact at the time of the explosion: those SNe that arise from progenitors with large, intact envelopes (e.g., Type II-plateau) have very low polarization, while those that result from progenitors that have lost part (SN IIb, SN IIn) or all (SN Ib) of their hydrogen (or even helium; SN Ic) layers prior to the explosion tend to show substantial polarization. Thus, the deeper we probe into core-collapse events, the greater the asphericity seems to be, suggesting a fundamentally asymmetric explosion with the asymmetry damped by the addition of envelope material.

Item Type:Book Section
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Filippenko, A. V.0000-0003-3460-0103
Additional Information:© 2005 Astronomical Society of the Pacific. Submitted on 21 Sep 2004. D.C.L. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-0401479. A.V.F. is grateful for NSF grant AST-0307894.
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Series Name:ASP Conference Series
Issue or Number:342
Record Number:CaltechAUTHORS:20110819-073513351
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24950
Deposited By: Ruth Sustaita
Deposited On:19 Aug 2011 15:10
Last Modified:20 Nov 2019 04:41

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