Type Ia supernova bolometric light curves and ejected mass estimates from the nearby supernova factory

R. Scalzo, G. Aldering, P. Antilogus, C. Aragon, S. Bailey, C. Baltay, S. Bongard, C. Buton, F. Cellier-Holzem, M. Childress, N. Chotard, Y. Copin, H.K. Fakhouri, E. Gangler, J. Guy, A.G. Kim, M. Kowalski, M. Kromer, J. Nordin, P. NugentK. Paech, R. Pain, E. Pecontal, R. Pereira, S. Perlmutter, D. Rabinowitz, M. Rigault, K. Runge, C. Saunders, S.A. Sim, G. Smadja, C. Tao, S. Taubenberger, R.C. Thomas, B.A. Weaver

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)

Abstract

We present a sample of normal Type Ia supernovae (SNe Ia) from the Nearby Supernova Factory data set with spectrophotometry at sufficiently late phases to estimate the ejected mass using the bolometric light curve.Wemeasure Ni masses from the peak bolometric luminosity, then compare the luminosity in the Co-decay tail to the expected rate of radioactive energy release 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 Ni throughout the ejecta. We find a strong correlation between ejected mass and light-curve decline rate, and consequently Ni mass, with ejected masses in our data ranging from 0.9 to 1.4 M. Most fast-declining (SALT2 x <-1) normal SNe Ia have significantly sub-Chandrasekhar ejected masses in our fiducial analysis.
Original languageEnglish
Pages (from-to)1498-1518
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume440
Issue number2
Early online date23 Mar 2014
DOIs
Publication statusPublished - 11 May 2014

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