Detection of circumstellar material in a normal Type Ia Supernova
| Autor: | Patat, F., Chandra, P., Chevalier, R., Justham, S., Podsiadlowski, Ph., Wolf, C., Gal-Yam, A., Pasquini, L., Crawford, I. A., Mazzali, P. A., Pauldrach, A. W. A., Nomoto, K., Benetti, S., Cappellaro, E., Elias-Rosa, N., Hillebrandt, W., Leonard, D. C., Pastorello, A., Renzini, A., Sabbadin, F., Simon, J. D., Turatto, M. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Science 317:924-926,2007 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1126/science.1143005 |
| Popis: | Type Ia supernovae are thought to be thermonuclear explosions of accreting white dwarfs that reach a critical mass limit. Despite their importance as cosmological distance indicators, the nature of their progenitors has remained controversial. Here we report the detection of circumstellar material in a normal Type Ia supernova. The expansion velocities, densities and dimensions of the circumstellar envelope indicate that this material was ejected from the progenitor system. The relatively low expansion velocities appear to favor a progenitor system where a white dwarf accretes material from a companion star which is in the red-giant phase at the time of explosion. Comment: 25 pages, 7 figures. Accepted for publication in Science. Full resolution version at http://www.hq.eso.org/~fpatat/science/sn06X/preprint.pdf . The original paper can be found at http://www.sciencemag.org/cgi/content/abstract/1143005 |
| Databáze: | arXiv |
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