【学术报告】
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报告题目：Discovering the population of ultracompact hot subdwarf binaries using large scale optical surveys

报告人：Thomas Kupfer 博士

报告人单位： California Institute of Technology

报告时间：2018年1月5日（星期五）上午10：30 

报告地点：主楼427会议室

报告语言：英文

报告摘要： 

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　　Ultracompact hot subdwarf binaries are short period binaries with orbital periods so short that the subdwarf will fill its Roche Lobe before the turning into a white dwarf. The study of these systems are important for our understanding of topics such as supernova Ia progenitors or binary evolution. Some of them might be detectable as Galactic gravitational wave sources with LISA.  

　　However, the number of known systems is still limited. In this talk I present the discovery of several new systems with orbital periods of 44min up to 87min as part of a search for hot (ultra-)compact post-common envelope systems with Palomar Transient Factory data based on a color selected sample from the Sloan Digital Sky Survey (SDSS).  

　　The Zwicky Transient Facility (ZTF) is a next-generation optical synoptic survey with a 47 sqd. survey camera that builds on the experience and infrastructure of the Palomar Transient Factory and starts science operations in fall 2017. I am lead investigator of an approved high-cadence survey in the Galactic Plane (|b|<7deg) covering the full inner Plane visible from the Northern hemisphere (Galactic longitude 10<l<230) as part of ZTF. This results in a total coverage of 3080 sqd. We will obtain 2 - 3 hr continuous lightcurves of each field with a cadence of 40 sec starting early 2018. I will give an overview of the survey as well as discuss the expected numbers of ultracompact hot subwarf binaries from this survey. 

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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/

云台邀请团组： 　　

大样本恒星演化研究组

中国科学院天体结构与演化重点实验室  

邀请方联系人：陈雪飞 13629413587

12月28日