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    Detection of circumstellar material in a normal type Ia supernova

    Patat, F. and Chandra, P. and Chevalier, R. and Justham, S. and Podsiadlowski, Ph. and Wolf, C. and Gal-Yam, A. and Pasquini, L. and Crawford, Ian and Mazzali, P.A. and Pauldrach, A.W.A. and Nomoto, K. and Benetti, S. and Cappellaro, E. and Elias-Rosa, N. and Hillebrandt, W. and Leonard, D.C. and Pastorello, A. and Renzini, A. and Sabbadin, F. and Simon, J.D. and Turatto, M. (2007) Detection of circumstellar material in a normal type Ia supernova. Science 317 (5840), pp. 924-926. ISSN 1095-9203.

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    Type Ia supernovae are important cosmological distance indicators. Each of these bright supernovae supposedly results from the thermonuclear explosion of a white dwarf star that, after accreting material from a companion star, exceeds some mass limit, but the true nature of the progenitor star system remains controversial. Here we report the spectroscopic detection of circumstellar material in a normal type Ia supernova explosion. The expansion velocities, densities, and dimensions of the circumstellar envelope indicate that this material was ejected from the progenitor system. In particular, the relatively low expansion velocities suggest that the white dwarf was accreting material from a companion star that was in the red-giant phase at the time of the explosion.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: Sarah Hall
    Date Deposited: 06 Aug 2019 14:13
    Last Modified: 02 Aug 2023 17:53


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