Other
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12223q&link_type=abstract
HST Proposal ID #12223. Cycle 18
Other
Scientific paper
A new class of stellar outbursts dwarfing the most powerful supernovae observed in the past century has recently been uncovered by wide field optical imaging surveys. With peak luminosities in excess of 10^44 erg/s and total radiative outputs greater than 10^51 erg, these events push the limits of conventional supernova explosion theory. One possibility is that these luminous supernovae {LSNe} are triggered by the electron-positron pair instability, and they may thus represent local analogs of the first stellar explosions to shape the universe. Another is that an additional source of power, such as that provided by spin-down of a nacent magnetar, adds energy into the ejecta after the initial supernova explosion. Near UV spectroscopy from HST/STIS can help break the observational degereracy to reveal the true physical origin of these events. We propose a non-disruptive ToO program for STIS spectroscopy to follow-up new LSNe discoveries in Cycle 18 supplemented with Swift UV photometry and ground based optical imaging and spectroscopy from the Keck and Palomar observatories.;
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