Аннотация
We present the GALEX detection of a UV burst at the time of explosion of an
optically normal Type II-P supernova (PS1-13arp) from the Pan-STARRS1 survey at
z=0.1665. The temperature and luminosity of the UV burst match the theoretical
predictions for shock breakout in a red supergiant, but with a duration a
factor of \~50 longer than expected. We compare the \$NUV\$ light curve of
PS1-13arp to previous GALEX detections of Type IIP SNe, and find clear
distinctions that indicate that the UV emission is powered by shock breakout,
and not by the subsequent cooling envelope emission previously detected in
these systems. We interpret the \~ 1 d duration of the UV signal with a shock
breakout in the wind of a red supergiant with a pre-explosion mass-loss rate of
\~ 10^-3 Msun yr^-1. This mass-loss rate is enough to prolong the duration of
the shock breakout signal, but not enough to produce an excess in the optical
plateau light curve or narrow emission lines powered by circumstellar
interaction. This detection of non-standard, potentially episodic high
mass-loss in a RSG SN progenitor has favorable consequences for the prospects
of future wide-field UV surveys to detect shock breakout directly in these
systems, and provide a sensitive probe of the pre-explosion conditions of SN
progenitors.
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