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RADIO OBSERVATIONS ...
RADIO OBSERVATIONS REVEAL A SMOOTH CIRCUMSTELLAR ENVIRONMENT AROUND THE EXTRAORDINARY TYPE Ib SUPERNOVA 2012au
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Kamble, Atish (author)
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Soderberg, Alicia M. (author)
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Chomiuk, Laura (author)
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Margutti, Raffaella (author)
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Medvedev, Mikhail (author)
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Milisavljevic, Dan (author)
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Chakraborti, Sayan (author)
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Chevalier, Roger (author)
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Chugai, Nikolai (author)
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Dittmann, Jason (author)
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Drout, Maria (author)
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- Fransson, Claes (author)
- Stockholms universitet,Institutionen för astronomi
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Nakar, Ehud (author)
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Sanders, Nathan (author)
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(creator_code:org_t)
- 2014
- 2014
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 797:1, s. 2-
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We present extensive radio and X-ray observations of SN 2012au, an energetic, radio-luminous supernova of Type Ib that exhibits multi-wavelength properties bridging subsets of hydrogen-poor superluminous supernovae, hypernovae, and normal core-collapse supernovae. The observations closely follow models of synchrotron emission from a shock-heated circumburst medium that has a wind density profile (rho alpha r(-2)). We infer a sub-relativistic velocity for the shock wave v approximate to 0.2 c and a radius of r approximate to 1.4 x 10(16) cm at 25 days after the estimated date of explosion. For a wind velocity of 1000 km s(-1), we determine the mass-loss rate of the progenitor to be M = 3.6 x 10(-6) M-circle dot yr(-1), consistent with the estimates from X-ray observations. We estimate the total internal energy of the radio-emitting material to be E approximate to 10(47) crg, which is intermediate to SN 1998bw and SN 2002ap. The evolution of the radio light curve of SN 2012au is in agreement with its interaction with a smoothly distributed circumburst medium and the absence of stellar shells ejected from previous outbursts out to r approximate to 10(17) cm from the supernova site. We conclude that the bright radio emission from SN 2012au was not dissimilar from other core-collapse supernovae despite its extraordinary optical properties, and that the evolution of the SN 2012au progenitor star was relatively quiet, marked with a steady mass loss, during the final years preceding explosion.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- radiation mechanisms: non-thermal
- radio continuum: general
- supernovae: general
- supernovae: individual (SN 2012au)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Kamble, Atish
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Soderberg, Alici ...
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Chomiuk, Laura
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Margutti, Raffae ...
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Medvedev, Mikhai ...
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Milisavljevic, D ...
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show more...
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Chakraborti, Say ...
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Chevalier, Roger
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Chugai, Nikolai
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Dittmann, Jason
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Drout, Maria
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Fransson, Claes
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Nakar, Ehud
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Sanders, Nathan
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astrophysical Jo ...
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Stockholm University