Studies of Twin Supernovae with the Nearby Supernova Factory

Details Studies of Twin Supernovae with the Nearby Supernova Factory Studies of Twin Supernovae with the Nearby Supernova Factory

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21912602f&link_type=abstract

American Astronomical Society, AAS Meeting #219, #126.02

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Scientific paper

We report on the latest developments in a study of "twin" supernovae with spectrophotometric timeseries of nearby Type Ia supernovae from the Nearby Supernova Factory. Two SNe Ia are considered twins if they have matching spectrophotometry at all epochs, though allowing a single multiplicative ratio to account for relative overall brightness difference (i.e. the difference between the Hubble residuals). We expect this luminosity distance-corrected brightness difference to be minimal for twin SNe, allowing further standardization of these cosmologically useful tools. One novel aspect in this report is the use of Gaussian process regression to model the SN spectral surface, allowing a direct statistical comparision of SN pairs and the interpolation of the data to a uniform epoch sampling.

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