Hot subdwarf stars with substellar companions from the MUCHFUSS project

来自 MUCHFUSS 项目的热亚矮星及其亚恒星伴星

• 批准号: 224973632
• 负责人: Professor Dr. Stephan Geier
• 金额: --
• 依托单位: Institut für Physik und Astronomie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/224973632?language=en
• 关键词: Hot; subdwarf; stars; substellar; companions

Our radial velocity survey of hot subdwarf stars from SDSS (MUCHFUSS) ledto the discovery of two very short period systems with most likely substellarcompanions. In the course of that survey we found more promising candidates. Theinteraction of planets and brown dwarfs with close-by main sequence stars may behighly important to understand the yet unclear origin of sdB stars, which are thestripped cores of red giants. Close binary interaction has been invoked to explain themassive loss of envelope necessary to form these compact, evolved stars. Whetherand under what conditions substellar companions are able to do the job is underdebate. Here we propose follow-up observations to obtain orbital parameters of ourcandidate short-period sdB binaries to discover more substellar companions.

我们从SDSS （MUCHFUSS）对热亚矮星的径向速度进行了调查，发现了两个非常短的周期系统，它们最有可能是恒星伴星。在调查过程中，我们发现了更多有前途的候选人。行星和棕矮星与附近的主序星的相互作用可能对理解sdB恒星的起源非常重要，这些恒星是红巨星剥离的核心。紧密的双星相互作用被用来解释形成这些致密、演化的恒星所必需的大量包层损失。是否以及在什么条件下，次恒星伴星能够完成这项工作还在争论中。在此，我们提出后续观测，以获得候选短周期sdB双星的轨道参数，以发现更多的次恒星伴星。