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Low-frequency radio view of a fast-blue optical transient - AT 2018cow

Published online by Cambridge University Press:  29 August 2024

A. J. Nayana Open the ORCID record for A. J. Nayana [Opens in a new window]  and
Poonam Chandra
A. J. Nayana*
Affiliation:
Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560034, India
Poonam Chandra
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville VA 22903, USA National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune, India
*
email: [email protected]
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Abstract

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We present low-frequency (0.40 – 1.25 GHz) radio observations and modeling of a Fast Blue Optical Transient (FBOT), AT2018cow [Nayana & Chandra(2021)]. Our data are best modeled as an inhomogeneous synchrotron emitting region expanding into an ionized circumstellar medium. We estimate the mass-loss rate of the progenitor star and shock parameters at multiple epochs post-explosion and find that the progenitor has gone through an enhanced phase of mass-loss close to its end-of-life.

Keywords

supernovae: individual: AT2018cowradio continuum: generalstars: mass loss
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 602 - 604
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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