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Second Maximum of SN 2019stc: Collision with a Circumstellar Shell?

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Abstract

We consider scenario of a supernova interaction with a circumstellar shell proposed earlier to account for the second maximum in the light curve of the superluminous supernova (SLSN-I) SN 2019stc. It is shown that this mechanism is able to describe the secondary maximum at a circumstellar envelope mass of about 0.3 \(M_{\odot}\). An important consequence of this scenario is the hard X-ray emission with a luminosity of \({\sim}(0.5-5)\times 10^{42}\) erg s\({}^{-1}\) during the secondary maximum. An X-ray flash coeval with a secondary maximum in SLSNe-I is proposed as a crucial test of the circumstellar interaction scenario.

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Funding

This research is supported by RFBR (19-12-00229-P) and DFG grant 21-52-12032.

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Authors and Affiliations

  1. Institute of Astronomy RAS, Moscow, Russia

    N. N. Chugai & V. P. Utrobin

  2. SRC ‘‘Kurchatov institute’’, Moscow, Russia

    V. P. Utrobin

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  1. N. N. Chugai
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  2. V. P. Utrobin
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Correspondence to N. N. Chugai.

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Chugai, N.N., Utrobin, V.P. Second Maximum of SN 2019stc: Collision with a Circumstellar Shell?. Astron. Lett. 49, 49–55 (2023). https://doi.org/10.1134/S1063773723020019

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  • DOI: https://doi.org/10.1134/S1063773723020019

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