155 articles – 1965 Notices  [english version]
 HAL : in2p3-00162424, version 1
 arXiv : 0707.1328
 Code Bibliographique ADS : 2008A&A...492..631A
 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.
 équipe(s) de recherche : APC - Cosmologie et Gravitation
 Thème(s) : Physique/Astrophysique/Cosmologie et astrophysique extra-galactiquePlanète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactiquePlanète et Univers/Astrophysique
 Mot(s)-clé(s) : stars: supernovae: general – galaxies: stellar content – cosmology: observations
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0707.1328
 in2p3-00162424, version 1 http://hal.in2p3.fr/in2p3-00162424 oai:hal.in2p3.fr:in2p3-00162424 Contributeur : Simone Lantz <> Soumis le : Vendredi 13 Juillet 2007, 14:16:43 Dernière modification le : Vendredi 22 Juin 2012, 21:08:14