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 http://resolver.caltech.edu/CaltechAUTHORS:20110819-073513351
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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|
|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.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||19 Aug 2011 15:10|
|Last Modified:||22 Dec 2014 01:27|
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