Computer Science
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..383r&link_type=abstract
NOAO Proposal ID #2009A-0383
Computer Science
Scientific paper
Our group has embarked on an imaging survey to find and track light echoes of the original light from Galactic Supernovae, and we have already found several associated with the Tycho supernova of 1572 and Cas A Supernova of 1680. Our survey continues in 2009A with southern targets to be imaged with the CTIO 4m/MOSAIC camera. Here we propose Gemini/GMOS-S spectroscopic follow-up of the brightest echoes found. These echoes are moving with an apparent motion of 30"/year, with knots of reflected light brightening and fading on monthly timescales, so they need to be treated as Targets of Opportunity. Since the SN light is reflected without thermal reprocessing, spectroscopy of the echoes reveals the mean SN spectrum around maximum luminosity, which we will use to determine the SN type and sub-type. We will also investigate whether we can find signs of asymmetry in the SN explosions by comparing the spectra of a single SN observed from different angles, as viewed from the locations of the dust clouds causing the echoes.
Becker Andy
Bergmann Marcel
Blondin Stephane
Challis Peter
Clocchiati Alejandro
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