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Eleven Years of Radio Monitoring of the type IIn Supernova SN 1995N

Chandra, Poonam and Stockdale, Christopher J. and Chevalier, Roger A. and Van Dyk, Schuyler D. and Ray, Alak and Kelley, Matthew T. and Weiler, Kurt W. and Panagia, Nino and Sramek, Richard A. (2009) Eleven Years of Radio Monitoring of the type IIn Supernova SN 1995N. Astrophysical Journal, 690 (2). pp. 1839-1846. ISSN 0004-637X.

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We present radio observations of the optically bright Type IIn supernova SN 1995N. We observed the SN at radio wavelengths with the Very Large Array for 11 years. We also observed it at low radio frequencies with the Giant Metrewave Radio Telescope at various epochs within 6.5 – 10 years since explosion. Although there are indications of an early optically thick phase, most of the data are in the optically thin regime so it is difficult to distinguish between synchrotron self absorption and free-free absorption (FFA) mechanisms. However, the information from other wavelengths indicates that FFA is the dominant absorption process. Model fits of radio emission with FFA give reasonable physical parameters. Making use of X-ray and optical observations, we derive the physical conditions of the shocked ejecta and the shocked circumstellar matter.

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Van Dyk, Schuyler D.0000-0001-9038-9950
Additional Information:© 2009. The American Astronomical Society. Received 2008 August 25; accepted 2008 September 16; published 2008 December 30. Print publication: Issue 2 (2009 January 10). We thank the VLA staff for making radio observations, without which this work was not possible. For the GMRT observations, we thank the staff of the GMRT which is run by the National Center for Radio Astrophysics of the Tata Institute of Fundamental Research (TIFR). We acknowledge the use of the AIPS, which was developed by the staff of the National Radio Astronomical Observatory. P.C. is a Jansky fellow at National Radio Astronomy Observatory. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. R.A.C. was supported in part by NSF grant AST-0807727. At the Tata Institute, this research formed a part of the projects 10P-201 and 11P-904 of the Five Year Plans. Online-only material: color figure
Group:Infrared Processing and Analysis Center (IPAC)
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National Radio Astronomical ObservatoryUNSPECIFIED
Associated Universities, Inc.UNSPECIFIED
Tata Institute of Fundamental Research10P-201
Tata Institute of Fundamental Research11P-904
Subject Keywords:ircumstellar matter; radiation mechanisms: non-thermal; radio continuum: stars; stars: mass loss; supernovae: individual (SN 1995N)
Issue or Number:2
Record Number:CaltechAUTHORS:CHAapj09
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12889
Deposited By: Archive Administrator
Deposited On:09 Jan 2009 00:46
Last Modified:03 Oct 2019 00:32

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