An asymmetric explosion as the origin of spectral evolution diversity in type Ia supernovae

K. Maeda (), S. Benetti, M. Stritzinger, F. K. Röpke, G. Folatelli, J. Sollerman, S. Taubenberger, K. Nomoto, G. Leloudas, M. Hamuy, M. Tanaka, P. A. Mazzali and N. Elias-Rosa
Additional contact information
K. Maeda: Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan
S. Benetti: INAF — Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
M. Stritzinger: Carnegie Institute for Science, Las Campanas Observatory, Colina el Pino Casilla 601, La Serena, Chile
F. K. Röpke: Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, 85741 Garching, Germany
G. Folatelli: Universidad de Chile, Casilla 36-D, Santiago, Chile
J. Sollerman: Dark Cosmology Centre, Niels Bohr Institute, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
S. Taubenberger: Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, 85741 Garching, Germany
K. Nomoto: Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan
G. Leloudas: Dark Cosmology Centre, Niels Bohr Institute, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
M. Hamuy: Universidad de Chile, Casilla 36-D, Santiago, Chile
M. Tanaka: Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan
P. A. Mazzali: Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, 85741 Garching, Germany
N. Elias-Rosa: Spitzer Science Center, California Institute of Technology, 1200 E. California Blvd, Pasadena, California 91125, USA

Nature, 2010, vol. 466, issue 7302, 82-85

Abstract: Type Ia supernovae: maintaining the standard The status of type Ia supernovae as cosmological 'standard candles' relies upon the assumption that they are very similar to one another and form a uniform class of objects. Recently, however, observational differences between type Ia supernovae have emerged. Maeda et al. propose a new model that takes account of recent theoretical and observational data and explains the observed spectral diversity as a consequence of random directions from which a theoretically proposed asymmetric explosion is viewed. On this basis, the spectral evolution diversity is no longer a concern in the continued use of type Ia supernovae as standard candles.

Date: 2010
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DOI: 10.1038/nature09122

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