The Intrinsic Color of Type Ia Supernovae Depends on Ejecta Velocity

Details The Intrinsic Color of Type Ia Supernovae Depends on Ejecta Velocity The Intrinsic Color of Type Ia Supernovae Depends on Ejecta Velocity

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733712f&link_type=abstract

American Astronomical Society, AAS Meeting #217, #337.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The intrinsic maximum-light B-V color of a Type Ia supernova (SN Ia) depends on the velocity of its ejecta at maximum brightness. Separating SNe Ia in two classes based on their ejecta velocity (normal and high-velocity), we notice that (1) for low and moderate reddening, the samples have similar extinction laws, (2) the bluest members of the high-velocity sample are significantly redder (by 0.1 mag) than the bluest members of the normal sample, and (3) the cumulative distribution functions (CDFs) of the two samples have extremely similar shapes, but the high-velocity CDF is offset by 0.1 mag to the red. We conclude that these samples have intrinsically different maximum-light colors. This effect can be explained by additional line blanketing in the B band for the high-velocity objects. We discuss the implications of this result, including how using this information will improve distance estimates to SNe Ia.

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