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arXiv 1202.4586astro-ph.EP
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系外行星宿主星的幸运成像多重性研究

A lucky imaging multiplicity study of exoplanet host stars

C. Ginski, M. Mugrauer, M. Seeliger, T. Eisenbeiss

摘要:

为了了解额外的宽恒星伴星对行星形成的影响,有必要确定多恒星系统在已知的太阳系外行星群中的比例。我们的目标是最近发现的径向速度系外行星系统,可从北半球和足够高的自行检测恒星同伴通过直接成像。我们利用Calar Alto 2.2米望远镜结合其幸运的成像相机AstraLux。到目前为止,天文学家已经观测到了71颗行星母星,其中有一颗新的低质量伴星(0.239 \pm 0.022 M \odot),位于行星母星HD 185269东北方4.5角秒(227天文单位),由AstraLux天体测量仪探测到。我们还提出了后续的天体测量三个以前发现的恒星同伴,第一次显示共同自行的0.5角秒的同伴HD126614。此外,我们确定了所有目标的探测极限,这使我们能够表征这些恒星可能的进一步同伴的探测空间。

英文摘要:

To understand the influence of additional wide stellar companions on planet formation, it is necessary to determine the fraction of multiple stellar systems amongst the known extrasolar planet population. We target recently discovered radial velocity exoplanetary systems observable from the northern hemisphere and with sufficiently high proper motion to detect stellar companions via direct imaging. We utilize the Calar Alto 2.2m telescope in combination with its lucky imaging camera AstraLux. 71 planet host stars have been observed so far, yielding one new low-mass (0.239 \pm 0.022M\odot) stellar companion, 4.5 arcsec (227AU of projected separation) northeast of the planet host star HD185269, detected via astrometry with AstraLux. We also present follow-up astrometry on three previously discovered stellar companions, showing for the first time common proper motion of the 0.5 arcsec companion to HD126614. Additionally, we determined the achieved detection limits for all targets, which allows us to characterize the detection space of possible further companions of these 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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