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Title:
One-dimensional delayed-detonation models of Type Ia supernovae: confrontation to observations at bolometric maximum
Authors:
Blondin, Stéphane; Dessart, Luc; Hillier, D. John; Khokhlov, Alexei M.
Affiliation:
AA(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388 Marseille, France; Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université, CNRS/IN2P3, 13288 Marseille, France; ), AB(Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388 Marseille, France; TAPIR, Mail code 350-17, California Institute of Technology, Pasadena, CA 91125, USA), AC(Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA), AD(Department of Astronomy and Astrophysics, the Enrico Fermi Institute, and the Computation Institute, The University of Chicago, Chicago, IL 60637, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 429, Issue 3, p.2127-2142 (MNRAS Homepage)
Publication Date:
03/2013
Origin:
OUP
Astronomy Keywords:
radiative transfer, supernovae: general
Abstract Copyright:
2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sts484
Bibliographic Code:
2013MNRAS.429.2127B

Abstract

The delayed-detonation explosion mechanism applied to a Chandrasekhar-mass white dwarf offers a very attractive model to explain the inferred characteristics of Type Ia supernovae (SNe Ia). The resulting ejecta are chemically stratified, have the same mass and roughly the same asymptotic kinetic energy, but exhibit a range in 56Ni mass. We investigate the contemporaneous photometric and spectroscopic properties of a sequence of delayed-detonation models, characterized by 56Ni masses between 0.18 and 0.81 M&sun;. Starting at 1 d after explosion, we perform the full non-local thermodynamic equilibrium, time-dependent radiative transfer with the code CMFGEN, with an accurate treatment of line blanketing, and compare our results to SNe Ia at bolometric maximum. Despite the 1D treatment, our approach delivers an excellent agreement to observations. We recover the range of SN Ia luminosities, colours and spectral characteristics from the near-ultraviolet to 1 mum, for standard as well as low-luminosity 91bg-like SNe Ia. Our models predict an increase in rise time to peak with increasing 56Ni mass, from ˜15 to ˜21 d, yield peak bolometric luminosities that match Arnett's rule to within 10 per cent and reproduce the much smaller scatter in near-infrared magnitudes compared to the optical. We reproduce the morphology of individual spectral features, the stiff dependence of the mathcal {R}(Si) spectroscopic ratio on 56Ni mass and the onset of blanketing from Ti II/Sc II in low-luminosity SNe Ia with a 56Ni mass ≲0.3 M&sun;. We find that ionization effects, which often dominate over abundance variations, can produce high-velocity features in Ca II lines, even in 1D. Distinguishing between different SN Ia explosion mechanisms is a considerable challenge but the results presented here provide additional support to the viability of the delayed-detonation model.
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