NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T22:44:24 PDT
Help | Comment | NED Home

For refcode 2010ApJ...710..444H:
Retrieve 12 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2010ApJ...710..444H Secondary Parameters of Type Ia Supernova Light Curves Hoflich, P.; Krisciunas, K.; Khokhlov, A. M.; Baron, E.; Folatelli, G.; Hamuy, M.; Phillips, M. M.; Suntzeff, N.; Wang, L.; NSF07-SNIa Collaboration Abstract. High-quality observations of B and V light curves obtained at Las Campanas Observatory for local Type Ia Supernovae (SNe Ia) show clear evidence that SNe Ia with the same brightness decline or stretch may have systematic and independent deviations at times t <~ 5 days before and at times t >~ 30 days after maximum light. This suggests the existence of two independent secondary parameters that control the shape of SN Ia light curves in addition to the primary light curve parameter, stretch s or {DELTA}m_15_. The secondary parameters may reflect two independent physical effects caused by variations in the initial carbon-to-oxygen (C/O) profile in the progenitor and the initial central density {rho}_ c_ in a carbon-oxygen white dwarf exploding as an SN Ia. Theoretical light curves of delayed detonation SN Ia models with varying progenitor masses on the main sequence, varying accretion rates, and varying primordial metallicity reproduce two morphologically different and independent types of variations in observed visual light curves. These calculations predict small variations of ~0.05 mag in the absolute brightness of SNe Ia which are correlated with the variations of progenitor mass on the main-sequence M_MS_, which changes the C/O profile, and {rho}_ c_, which depends on the accretion rate. Such variations in real supernovae will induce systematic errors in SN Ia calibration at high redshifts. A physically motivated three-parameter, s, C/O, {rho}_ c_, template for SNe Ia light curves might take these variations into account. Comparison between the theoretical predictions and the observational results agree qualitatively; however, the observations show variations between the B and V light curves that are not expected from the modeling and may indicate limitations in the details of the theoretical models. Key words: distance scale, supernovae: general, supernovae: individual: 2004ef 2005al 2005am 2005el 2005ki 2005na
Retrieve 12 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home