Optical Observations of SN 1999aa

Details Optical Observations of SN 1999aa Optical Observations of SN 1999aa

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915015s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #150.15; Bulletin of the American Astronomical Society,

Physics

Scientific paper

The distance measurements that have been used in determining the acceleration of the universe are based on type Ia supernova (SN Ia) luminosities calibrated using the light-curve shape. Detailed analysis of SNe Ia, and peculiar objects in particular, lead to a better understanding of the physics associated with the luminosity calibration, hopefully leading to more precise distances. SN 1999aa (and similar objects) is a somewhat peculiar SN Ia with spectral properties intermediate to a normal SN Ia and the prototypical overluminous SN 1991T. Similarly, SN 1999aa's light curves appear to bridge the gap between the normal and overluminous SNe Ia. The incredible homogeneity of SNe Ia (including overluminous objects) suggests that all SNe Ia come from a similar progenitor and have a similar explosion model. Since SN 1999aa has characteristics in common with both normal and overluminous objects, understanding the physics of SN 1999aa-like events may help constrain progenitor and explosion models for both types of objects. We present optical spectra and photometry across four bandpasses for a set of SN 1999aa-like objects. This data suggests that SN 1999aa is the Rosetta stone in understanding the differences and similarities between normal and overluminous SNe Ia.

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