Type Ia supernova bolometric light curves and ejected mass estimates from the Nearby Supernova Factory

Abstract : We present a sample of normal type Ia supernovae from the Nearby Supernova Factory dataset with spectrophotometry at sufficiently late phases to estimate the ejected mass using the bolometric light curve. We measure $^{56}$Ni masses from the peak bolometric luminosity, then compare the luminosity in the $^{56}$Co-decay tail to the expected rate of radioactive energy re- lease from ejecta of a given mass. We infer the ejected mass in a Bayesian context using a semi-analytic model of the ejecta, incorporating constraints from contemporary numerical models as priors on the density structure and distribution of $^{56}$Ni throughout the ejecta. We find a strong correlation between ejected mass and light curve decline rate, and consequently $^{56}$Ni mass, with ejected masses in our data ranging from 0.9-1.4 $M_\odot$. Most fast-declining (SALT2 $x_1 < -1$) normal SNe Ia have significantly sub-Chandrasekhar ejected masses in our fiducial analysis.
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00958452
Contributor : Sylvie Flores <>
Submitted on : Wednesday, March 12, 2014 - 3:07:36 PM
Last modification on : Tuesday, November 19, 2019 - 2:42:49 AM

Links full text

Identifiers

Citation

R. Scalzo, G. Aldering, P. Antilogus, C. Aragon, S. Bailey, et al.. Type Ia supernova bolometric light curves and ejected mass estimates from the Nearby Supernova Factory. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2014, 440, pp.1498-1518. ⟨10.1093/mnras/stu350⟩. ⟨in2p3-00958452⟩

Share

Metrics

Record views

417