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

Abstract

view Abstract Citations (56) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS SN 1992bc and SN 1992bo: Evidence for Intrinsic Differences in Type IA Supernova Luminosities Maza, Jose ; Hamuy, Mario ; Phillips, M. M. ; Suntzeff, N. B. ; Aviles, R. Abstract Based on the two best-observed Type 1a 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 1992be 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). Publication: The Astrophysical Journal Pub Date: April 1994 DOI: 10.1086/187286 Bibcode: 1994ApJ...424L.107M Keywords: Astronomical Photometry; Background Radiation; Interstellar Extinction; Optical Emission Spectroscopy; Supernovae; Charge Coupled Devices; Light Curve; Luminosity; Red Shift; Spectrograms; Astrophysics full text sources ADS | data products SIMBAD (9) NED (4)