Massive unseen compact companions to hot subluminous stars

巨大的看不见的致密伴星是炽热的亚光度恒星

• 批准号: 113098793
• 负责人: Professor Dr. Ulrich Heber
• 金额: --
• 依托单位: Dr. Remeis-Sternwarte Bamberg - Astronomisches Institut -
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/113098793?language=en
• 关键词: Massive; unseen; compact; companions; hot

Neutron stars and stellar-mass black holes are the remnants of massive stars ending their lifes in supernova explosions. Detecting these exotic objects is usually only possible in a binary, when matter is transferred from the luminous star to the compact object and bright X-rays are emitted from the strongly heated accreted material. In a detached binary, however, they can only be detected from the Dopper-reflex motion of the visible star. In our pilot study of detached hot subdwarf binaries we took advantage of their orbital synchronisation and found that at least three out of our sample of 51 must have very massive, but invisible companions, i.e. neutron stars or even black holes. This fraction is unexpectedly large because these objects are considered to be rare. This new connection between hot subdwarfs, which are numerous in our Galaxy, and massive compact objects may lead to a tremendous increase in the number of known neutron stars and black holes. However, our analysis suffers from selection effects which can not be quantified yet. This can only be achieved by a much larger sample. Therefore, we have initiated a large survey to search for hot subwarfs with massive companions in a much bigger space volume than before. High sensitivity to massive companions is ensured by the survey s efficient target pre-selection strategy. The smoking gun will be a high-amplitude, short-period binary system, because it will exclude any possibility of doubt about the nature of the companion. The results will shed light on the population of neutron stars and black holes as companions in detached binaries and their evolutionary link to the X-ray binary population. The project will also reveal the properties of the halo population of hot subdwarfs and allow the Galactic gravitational potential to be probed.

中子星和恒星质量的黑洞是大量恒星的残余，结束了他们在超新星爆炸中的生命。通常只有在二进制中检测这些外来物体，当物质从发光恒星传递到紧凑的物体时，并从强加热的积聚材料中发出明亮的X射线。然而，在独立的二进制中，只能从可见星的多普反射运动中检测到它们。在我们对脱落热的二进制二进制的试点研究中，我们利用了它们的轨道同步，发现51个样本中至少有三个必须具有非常庞大的伴侣，但不可见的伴侣，即中子星或黑洞。这一部分意外的是很大，因为这些物体被认为是罕见的。在我们的银河系中众多和大量紧凑物体的热分子点之间的这种新联系可能会导致已知的中子星和黑洞的数量大大增加。但是，我们的分析遭受了无法量化的选择效应。这只能通过更大的样本来实现。因此，我们已经开始了一项大规模调查，以搜索与以前更大的空间量的大量同伴的热门低音。通过调查的有效目标预选策略确保对大型伴侣的高敏感性。吸烟枪将是一个高振幅，短期二进制系统，因为它将排除对同伴性质的任何疑问。结果将阐明中子星和黑洞的种群，作为分离二进制的同伴及其与X射线二元人口的进化联系。该项目还将揭示热分子的光环种群的性质，并允许探测银河系的重力。

项目成果

Radial velocity variable, hot post-AGB stars from the MUCHFUSS project. Classification, atmospheric parameters, formation scenarios

• DOI: 10.1051/0004-6361/201527637
• 发表时间: 2016-01
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: N. Reindl;S. Geier;T. Kupfer;S. Bloemen;V. Schaffenroth;U. Heber;B. Barlow;R. Ostensen

The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project

MUCHFUSS 项目的径向速度可变热亚光度恒星目录

• DOI: 10.1051/0004-6361/201525666
• 发表时间: 2015
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Kupfer;Schaffenroth;V. Barlow;Østensen;O’Toole;Ziegerer;Heuser
• 通讯作者: Heuser

Hot subdwarf stars and their connection to thermonuclear supernovae

• DOI: 10.1088/1742-6596/728/7/072017
• 发表时间: 2016-04
• 期刊: Journal of Physics: Conference Series
• 作者: S. Geier;T. Kupfer;E. Ziegerer;U. Heber;P. Németh;A. Irrgang

AN EXTREMELY FAST HALO HOT SUBDWARF STAR IN A WIDE BINARY SYSTEM

宽双星系统中一颗极其接近光环的热亚矮星

• DOI: 10.3847/2041-8205/821/1/l13
• 发表时间: 2016
• 期刊: The Astrophysical Journal Letters
• 作者: Németh;Ziegerer;Irrgang;Fürst;Kupfer
• 通讯作者: Kupfer

Orbital solutions of eight close sdB binaries and constraints on the nature of the unseen companions

• DOI: 10.1051/0004-6361/201323115
• 发表时间: 2014-01
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: S. Geier;R. Oestensen;U. Heber;T. Kupfer;P. Maxted;B. Barlow;M. Vučković;A. Tillich;S. Mueller;H. Edelmann;L. Classen;A. McLeod