Supernovae at Late Times

Details Supernovae at Late Times Supernovae at Late Times

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..232k&link_type=abstract

NOAO Proposal ID #1999B-0232

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Scientific paper

We propose to renew a long-term program to study the light curves of a handful of bright supernovae from their initial outbursts through their revealing late stages. Near discovery, at 12-14 mag down to 19 mag, we will use our own 1.2m at Mount Hopkins: this proposal covers observations from mag 18 to 23 using the KPNO 2.1m. We will obtain with CCD spectrographs on the FLWO 1.5 m and other telescopes to the same limits as the 2.1m photometry. For a few special targets, HST will observe in the ultraviolet and at late times. This proposal, coupled with our efforts at other observatories should go a long way toward sorting out the roles of radioactivity, pulsar power, and shock interactions in powering supernovae at late times, as well as help us use these intrinsically bright objects as tools to measure extragalactic distances. 1998 was a good year for bright supernovae with two Type Ia (1998bu and 1998aq) and one bizarre Type IIn (1998S) that can be followed at late-times with the KPNO 2.1m. Our sustained study of the rare, but revealing, apparently bright supernovae has proved to be the best approach to understanding supernova physics. Dust formation and the sources of energy input can only be seen at late times in nearby events. Large sets of apparently faint supernovae have their uses, but understanding how supernovae work is best done through investigation of the best cases.

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