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On the Explosion Geometry of Red Supergiant Stars

Published online by Cambridge University Press:  27 October 2016

Douglas C. Leonard ,
Luc Dessart ,
Giuliano Pignata ,
D. John Hillier ,
George G. Williams ,
Paul S. Smith ,
Harish Khandrika ,
Christopher Bilinski ,
Nhieu Duong  and
Kelsi Flatland
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Douglas C. Leonard
Affiliation:
San Diego State University
Luc Dessart
Affiliation:
U. Nice Sophia-Antipolis
Giuliano Pignata
Affiliation:
U. Andres Bello
D. John Hillier
Affiliation:
U. Pittsburgh
George G. Williams
Affiliation:
MMT Observatory
Paul S. Smith
Affiliation:
U. Arizona
Harish Khandrika
Affiliation:
San Diego State University Space Telescope Science Institute
Christopher Bilinski
Affiliation:
U. Arizona
Nhieu Duong
Affiliation:
San Diego State University
Kelsi Flatland
Affiliation:
San Diego State University
Luis Gonzalez
Affiliation:
San Diego State University
Jennifer L. Hoffman
Affiliation:
U. Denver
Chuck Horst
Affiliation:
San Diego State University
Leah Huk
Affiliation:
U. Denver
Peter Milne
Affiliation:
U. Arizona
Alisa A. Rachubo
Affiliation:
San Diego State University
Nathan Smith
Affiliation:
U. Arizona
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Abstract

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We present the observed “continuum” levels of polarization as a function of time for four well-observed Type II-Plateau supernovae (SNe II-P; Fig. 1), the class of SNe decisively determined to arise from red supergiant stars (Smartt 2009). All four objects show temporally increasing degrees of polarization through the end of the photospheric phase, with some exhibiting early-time polarization that challenge existing models (e.g., Dessart and Hillier 2011) to reproduce. A fundamental ejecta asymmetry is present in this photometrically diverse sample of type II SNe, and it probably takes different forms (e.g., 56Ni blobs/fingers, large scale deformation). We acknowledge support from NSF grants AST-1009571 and AST-1210311.

Keywords

Supernovae: individual (SN 2004dj, SN 2008bk, SN 2012aw, SN 2013ej)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 458
Copyright
Copyright © International Astronomical Union 2016 

References

Dall'Ora, M., et al. 2014, ApJ, 787, 139 Google Scholar
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Leonard, D. C., et al. 2006, Nature, 440, 505 Google Scholar
Leonard, D. C., Dessart, L., Hillier, D. J., & Pignata, G. 2012, in: Hoffman, J., Whitney, B., & Bjorkman, J. (eds.), Stellar Polarimetry (New York, AIP), 1429, 204 Google Scholar
Richmond, M. W. 2014, JAAVSO, 42, 333 Google Scholar
Smartt, S. J. 2009, ARAA, 47, 63 CrossRefGoogle Scholar