A Snapshot Survey of Nearby Supernovae with the Hubble Space Telescope
arxiv(2024)
Abstract
Over recent decades, robotic (or highly automated) searches for supernovae
(SNe) have discovered several thousand events, many of them in quite nearby
galaxies (distances < 30 Mpc). Most of these SNe, including some of the
best-studied events to date, were found before maximum brightness and have
associated with them extensive follow-up photometry and spectroscopy. Some of
these discoveries are so-called SN impostors, thought to be superoutbursts of
luminous blue variable stars, although possibly a new, weak class of
massive-star explosions. We conducted a Snapshot program with the Hubble Space
Telescope(HST) and obtained images of the sites of 31 SNe and four impostors,
to acquire late-time photometry through two filters. The primary aim of this
project was to reveal the origin of any lingering energy for each event,
whether it is the result of radioactive decay or, in some cases, ongoing
late-time interaction of the SN shock with pre-existing circumstellar matter,
or the presence of a light echo. Alternatively, lingering faint light at the SN
position may arise from an underlying stellar population (e.g., a host star
cluster, companion star, or a chance alignment). The results from this study
complement and extend those from Snapshot programs by various investigators in
previous HST cycles.
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