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arXiv 1209.4087astro-ph.SRastro-ph.EP
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系外行星宿主恒星的恒星同伴:过境行星宿主的幸运成像

Stellar companions to exoplanet host stars: Lucky Imaging of transiting planet hosts

Carolina Bergfors, Wolfgang Brandner, Sebastian Daemgen, Beth Biller, Stefan Hippler, Markus Janson, Natalia Kudryavtseva, Kerstin Geißler, Thomas Henning, Rainer Köhler

摘要:

观测到的双星/多星系统中恒星和行星的性质为行星形成和演化提供了线索。我们将我们对视觉恒星同伴的调查扩展到21颗恒星的凌日系外行星的主机,使用两台AstraLux仪器的幸运成像技术:Calar Alto 2.2米望远镜的AstraLux Norte和La Silla ESO 3.5米新技术望远镜的AstraLux Sur。我们对凌日行星宿主星HAT-P-8和WASP-12的两颗以前未知的二元候选伴星进行了观测,并推导出伴星候选者的光度和天体测量特性。先前发现的与系外行星宿主恒星TrES-4和WASP-2的候选伴星的共同自行从后续观测中得到证实。对AstraLux观测到的31颗凌日系外行星的主星进行的贝叶斯统计分析表明,行星主星的伴星比例与太阳型场星的伴星比例没有显着差异,但行星主星的双星分离平均较大。

英文摘要:

Observed properties of stars and planets in binary/multiple star systems provide clues to planet formation and evolution. We extended our survey for visual stellar companions to the hosts of transiting exoplanets by 21 stars, using the Lucky Imaging technique with the two AstraLux instruments: AstraLux Norte at the Calar Alto 2.2-m telescope, and AstraLux Sur at the ESO 3.5-m New Technology Telescope at La Silla. We present observations of two previously unknown binary candidate companions, to the transiting planet host stars HAT-P-8 and WASP-12, and derive photometric and astrometric properties of the companion candidates. The common proper motions of the previously discovered candidate companions with the exoplanet host stars TrES-4 and WASP-2 are confirmed from follow-up observations. A Bayesian statistical analysis of 31 transiting exoplanet host stars observed with AstraLux suggests that the companion star fraction of planet hosts is not significantly different from that of solar-type field stars, but that the binary separation is on average larger for planet host stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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