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@. An important consequence of this scenario is the hard X-ray emission with a luminosity of @(0,5-5)*1042  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.

About the authors

N. N. Chugai

Institute of Astronomy RAS

Email: nchugai@inasan.ru
Moscow, Russia

V. P. Utrobin

SRC ‘‘Kurchatov institute’’; Institute of Astronomy RAS

Author for correspondence.
Email: nchugai@inasan.ru
Moscow, Russia; Moscow, Russia

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