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A double plateau and unprecendented circumstellar variable sodium in the transient SN 2011A

Published online by Cambridge University Press:  29 January 2014

T. de Jaeger ,
J. Anderson ,
G. Pignata  and
M. Hamuy
T. de Jaeger
Affiliation:
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
J. Anderson
Affiliation:
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
G. Pignata
Affiliation:
Departamento de Ciencias Físicas - Universidad Andrés Bello, Avda. República 252, Santiago, Chile. email: [email protected]
M. Hamuy
Affiliation:
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
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Abstract

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We present optical photometry and spectrosopy of the transient SN 2011A. Our data spans 140 days after discovery including BVRIu'g'r'i'z' photometry and a sequence of 11 spectra. First classified as a type IIn supernova due to the presence of narrow Hα emission, this object shows exceptional characteristics. Firstly, the light curve shows a double plateau; a property only before observed in the impostor object SN 1997bs. Secondly SN 2011A has a very low luminosity for a type IIn supernova placing it between the type IIn supernovae and impostor classes in terms of luminosity. Thirdly, SN 2011A shows low velocity and high equivalent width sodium doublet absorption which increases with time and is most likely of circumstellar origin. This evolution is also accompanied by a change of line profile. When the absorption becomes stronger, a P-Cygni profile appears.

Keywords

circumstellar mattersupernovae: indivudual: 2011Astars: mass losswinds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S296: Supernova Environmental Impacts , January 2013 , pp. 346 - 347
Copyright
Copyright © International Astronomical Union 2014 

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