HAL : in2p3-00162424, version 1

arXiv : 0707.1328

Code Bibliographique ADS : 2008A&A...492..631A

DOI : 10.1051/0004-6361:200809796

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Astronomy and Astrophysics 492 (2008) 631-636

Evidence of short-lived SN Ia progenitors

E. Aubourg1, 2, 3, R. Tojeiro, R. Jimenez3, A. F. Heavens, M. A. Strauss3, D. N. Spergel3

(2008)

We use the VESPA algorithm and spectra from the Sloan Digital Sky Survey to investigate the star formation history of the host galaxies of 257 type Ia supernovae. We find 5$\sigma$ evidence of a short-lived population of progenitors with lifetimes of less than 180 Myr, indicating a type Ia supernova channel arising from stars in the mass range ~3.5-8 $M_\odot$. As standardizeable candles, type Ia supernovae play an important role in determining the expansion history of the Universe, but to be useful for future cosmological surveys, the peak luminosity needs to be free of uncorrected systematic effects at the level of 1-2%. If the different progenitor routes lead to supernovae with even moderately small differences in properties, then these need to be corrected for separately, or they could lead to a systematic bias in future supernovae surveys, as the prompt route is likely to increase in importance at high redshift. VESPA analysis of hosts could be a valuable tool in this, by identifying which progenitor route is most likely.

1 :	APC - AstroParticule et Cosmologie
2 :	IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
3 :	Princeton University

équipe(s) de recherche : APC - Cosmologie et Gravitation

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique

Mot(s)-clé(s) : stars: supernovae: general – galaxies: stellar content – cosmology: observations

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Contributeur : Simone Lantz <>

Soumis le : Vendredi 13 Juillet 2007, 14:16:43

Dernière modification le : Vendredi 22 Juin 2012, 21:08:14