Detection of circumstellar material in a normal type Ia supernova

被引：324

作者：

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.

机构：

[1] European So Observ, D-85748 Garching, Germany

[2] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[3] Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England

[4] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[5] Univ London Birkbeck Coll, Sch Earth Sci, London WC1E 7HX, England

[6] Max Planck Inst Astrophys, D-85748 Garching, Germany

[7] Osserv Astron Trieste, INAF, I-34131 Trieste, Italy

[8] Univ Munich, Inst Astron & Astrophys, D-81679 Munich, Germany

[9] Univ Tokyo, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan

[10] Osserv Astron Padova, INAF, I-35122 Padua, Italy

[11] Univ La Laguna, E-38206 Tenerife, Spain

[12] San Diego State Univ, Dept Astron, San Diego, CA 92182 USA

[13] Queens Univ Belfast, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland

来源：

SCIENCE | 2007年 / 317卷 / 5840期

关键词：

D O I：

10.1126/science.1143005

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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. Normalized Flux

引用

页码：924 / 926

页数：3

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