SN 1992bc and SN 1992bo: Evidence for intrinsic differences in type IA supernova luminosities

Details SN 1992bc and SN 1992bo: Evidence for intrinsic differences in type IA supernova luminosities SN 1992bc and SN 1992bo: Evidence for intrinsic differences in type IA supernova luminosities

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424l.107m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 424, no. 2, p. L107-L110

Astronomy and Astrophysics

Astrophysics

52

Astronomical Photometry, Background Radiation, Interstellar Extinction, Optical Emission Spectroscopy, Supernovae, Charge Coupled Devices, Light Curve, Luminosity, Red Shift, Spectrograms

Scientific paper

Based on the two best-observed Type Ia supernovae found in the Calan/Tololo Supernova Search, in this Letter we present convincing evidence that Type Ia supernovae with a fast rate of decline in the B band are intrinsically subluminous with respect to those with a slower decline rate. The effect is greater in the B band than in the I band. Specifically, we show that the two Type Ia supernovae SN 1992bc and SN 1992bo differ by 0.80 +/- 0.2 mag in their peak B absolute magnitudes, and by only 0.41 +/- 0.2 mag in the I band. SN 1992bc occurred in a spiral galaxy, whereas SN 1992bo exploded very far from the nucleus of a lenticular galaxy. These findings suggest the possibility that these two Type Ia supernovae may have had progenitors with significant physical differences. Both objects are normal Type Ia supernovae from a photometric and spectroscopic point of view. Even though these objects confirm the dependence of the absolute B magnitude on the rate of decline, that relation could be less pronounced than suggested recently by Phillips (1993).

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