A Hubble Space Telescope Snapshot survey of nearby supernovae

Weidong Li, Alexei V. Filippenko, Schuyler D. Van Dyk, Jingyao Hu, Yulei Qiu, Maryam Modjaz, Douglas C. Leonard

    Research output: Contribution to journalArticle

    Abstract

    We present photometry of 13 recent supernovae (SNe) recovered in a Hubble Space Telescope Snapshot program and tie the measurements to earlier ground-based observations in order to study the late-time evolution of the SNe. Many of the ground-based measurements are previously unpublished and were made primarily with a robotic telescope, the Katzman Automatic Imaging Telescope. Evidence for circumstellar interaction is common among the core-collapse SNe. Late-time decline rates for Type IIn SNe are found to span a wide range, perhaps because of differences in circumstellar interaction. An extreme case, SN IIn 1995N, declined by only 1.2 mag in V over about 4 yr following discovery. Template images of some SNe must therefore be obtained many years after the explosion if contamination from the SN itself is to be minimized. Evidence is found against a previous hypothesis that the Type IIn SN 1997bs was actually a superoutburst of a luminous blue variable star. The peculiar SN Ic 1997ef, a "hypernova," declined very slowly at late times. The decline rate of the SN Ia 2000cx decreased at late times, but this is unlikely to have been caused by a light echo.

    Original languageEnglish (US)
    Pages (from-to)403-415
    Number of pages13
    JournalPublications of the Astronomical Society of the Pacific
    Volume114
    Issue number794
    DOIs
    StatePublished - 2002

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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