学术通告
2019年度
2018年度
2017年度
2016年度
2015年度
2014年度
2013年度
2012年度
2011年度
2010年度
规章制度
通知公告
·关于停止接待散客参观的公告 (2020-12-29)
·2020年“国家奖学金”获奖名单公示 (2020-10-26)
·中国科学院云南天文台食堂原材料供应商遴选公告 (2020-09-30)
·中国科学院云南天文台关于2020年度岗位聘用事宜的通知 (2020-09-03)
·昆明分院拟提名2020年度云南省科学技术奖励项目相关信息公示 (2020-07-06)
·中国科学院云南天文台2019-2020学年优秀学生初选名单公示 (2020-05-25)
·关于做好2020年度中国科学院院长奖学金初选工作的通知 (2020-05-02)
·关于做好2020年度朱李月华奖学金评选工作的通知 (2020-05-02)
·关于申报2020年度中国科学院大学—必和必拓奖学金的通知 (2020-01-14)
·计算太阳物理领域博士后招聘启事 (2020-01-06)
您现在的位置:首页 > 新闻资讯 > 学术通告 > 2016年度
【云台学术报告】2016年1月20日(周三)上午10:00-11:00 小学校会议室
2016-01-16  |  作者:  |  【  】 【打印】 【关闭

【学术报告】
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
报告题目:The Post-Merger Magnetized Evolution of White Dwarf Binaries
报告人:Suoqing Ji
报告人单位:Department of Physics , University of California, Santa Barbara
报告时间:2016年1月20日(周三)上午10:00-11:00
报告地点:小学校会议室
报告语言:英文

报告摘要: Type Ia supernovae (SNe Ia) play a crucial role as standardizable cosmological candles, though the nature of their progenitors is a subject of active investigation. Recent observational and theoretical work has pointed to merging white dwarf binaries, referred to as the double-degenerate channel, as the possible progenitor systems for some SNe~Ia. Additionally, recent theoretical work suggests that mergers which fail to detonate may produce magnetized, rapidly-rotating white dwarfs. In this paper, we present the first multidimensional simulations of the post-merger evolution of white dwarf binaries to include the effect of the magnetic field. In these systems, the two white dwarfs complete a final merger on a dynamical timescale, and are tidally disrupted, producing a rapidly-rotating white dwarf merger surrounded by a hot corona and a thick, differentially-rotating disk. The disk is strongly susceptible to the magnetorotational instability (MRI), and we demonstrate that this leads to the rapid growth of an initially dynamically weak magnetic field in the disk, the spin-down of the white dwarf merger, and to the subsequent central ignition of the white dwarf merger. Additionally, these magnetized models exhibit new features not present in prior hydrodynamic studies of white dwarf mergers, including the development of MRI turbulence in the hot disk, magnetized outflows carrying a significant fraction of the disk mass, and the magnetization of the white dwarf merger to field strengths $\sim 2 \times 10^8$~G. We discuss the impact of our findings on the origins, circumstellar media, and observed properties of SNe Ia and magnetized white dwarfs.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
请全体师生踊跃参加!

本通知也可以在云台学术报告网页看到:

http://www.ynao.cas.cn/xwzx/xstg/

申请安排学术报告的同事请参见台学术报告管理办法:

http://www.ynao.cas.cn/xwzx/xstg/gzzd/

大样本恒星演化团组

云南天文台学术委会

 

1月16日

 
©2010  中科院云南天文台    版权所有     滇ICP备05000010号-1    滇公网安备53011102001009号
地址:中国 云南省 昆明市 官渡区 羊方旺396号    邮编:650216    联系我们