Evidence for an asymptotic giant branch star in the progenitor system of a type Ia supernov.pdfVIP

下载本文档

7
0
约1.81万字
约 15页
2017-04-05 发布于江苏
举报
版权申诉

Evidence for an asymptotic giant branch star in the progenitor system of a type Ia supernov.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Evidence for an asymptotic giant branch star in the progenitor system of a type Ia supernov

1 Evidence for an asymptotic giant branch star in the progenitor system of a type Ia supernova Mario Hamuy*?, M. M. Phillips?, Nicholas B. Suntzeff║, José Maza?, L. E. González?, Miguel Roth?, Kevin Krisciunas?, Nidia Morrell?, E. M. Green§, S. E. Persson*, P. J. McCarthy* * Carnegie Observatories, 813 Santa Barbara St., Pasadena, CA, USA ? Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile ║ Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, Casilla 603, La Serena, Chile ? Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile § University of Arizona, Steward Observatory, Tucson, AZ 85721, USA ? Hubble Fellow A type Ia supernova (SN Ia), one of the two main classes of exploding stars, is recognized by the absence of hydrogen and the presence of elements such as silicon and sulphur in its spectra. These explosions are thought to produce the majority of iron-peak elements in the universe and are known to be precise “standard candles” used to measure distances to galaxies. While there is general agreement that SNe Ia are exploding white dwarfs1, astronomers face the embarrassing problem that the progenitor systems have never been directly observed. Significant effort has been put into the detection of circum-stellar material (CSM) in order to discriminate between the different types of possible progenitor systems2, yet no CSM has been found3. Here we report optical observations of SN 2002ic which reveal large amounts of CSM seen as a strong hydrogen emission. This observation 2 suggests that the progenitor system contained a massive asymptotic branch giant star which lost a few solar masses of hydrogen-rich gas prior to the type Ia explosion. SN 2002ic was discovered before or near maximum light by the Nearby Supernova Factory search4. It appeared ~4 arc seconds west of a faint elongated galaxy and north of a fainter galaxy (see Supplementary Informat