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Low-frequency radio observations of SN 2011dh and the evolution of its post-shock plasma properties

Yadav, Naveen and Ray, Alak and Chakraborti, Sayan (2016) Low-frequency radio observations of SN 2011dh and the evolution of its post-shock plasma properties. In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 459 (1). pp. 595-602.

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Official URL: http://dx.doi.org/10.1093/mnras/stw594


We present late time, low-frequency observations of SN 2011dh made using the Giant Metrewave Radio Telescope (GMRT). Our observations at 325, 610 and 1280 MHz conducted between 93 and 421 d after the explosion supplement the millimeter and centimetrewave observations conducted between 4 and 15 d after explosion using the Combined Array for Research in Millimeter-wave Astronomy (CARMA) and extensive radio observations (1.0-36.5 GHz) conducted between 16 and 93 d after explosion using Jansky Very Large Array (JVLA). We fit a synchrotron self absorption model (SSA) to the 610 and 1280 MHz radio light curves. We use it to determine the radius (R-p) and magnetic field (B-p) at 173 and 323 d after the explosion. A comparison of the peak radio luminosity Lop with the product of the peak frequency nu(p) and time to peak t(p) shows that the supernova evolves between the epochs of CARMA, JVLA and GMRT observations. It shows a general slowing down of the expansion speed of the radio emitting region on a time-scale of several hundred days during which the shock is propagating through a circumstellar medium set up by a wind with a constant mass-loss parameter, (M) over dot / nu(w). We derive the mass-loss parameter (A(star)) based on 610 and 1280 MHz radio light curves, which are found to be consistent with each other within error limits.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
Keywords: radiation mechanisms: non-thermal; techniques: interferometric; stars: mass-loss; supernovae: individual: SN 2011dh; radio continuum: general
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 22 Jun 2016 05:24
Last Modified: 22 Jun 2016 05:24
URI: http://eprints.iisc.ac.in/id/eprint/54038

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