KNOW THE STAR, KNOW THE PLANET. III. DISCOVERY OF LATE-TYPE COMPANIONS TO TWO EXOPLANET HOST STARS
KNOW THE STAR, KNOW THE PLANET. III. DISCOVERY OF LATE-TYPE COMPANIONS TO TWO EXOPLANET HOST STARS
复制标题
了解星星，了解星球。
DOI：
10.1088/0004-6256/149/4/118
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
C. Baranec
中科院分区：
文献类型：
--
作者：
Lewis C. Roberts Jr.;A. Tokovinin;B. Mason;R. Riddle;W. Hartkopf;N. Law;C. Baranec
我们讨论两个多星星系统，主机已知的系外行星：HD 2638和30阿里B。自适应光学图像显示了两颗恒星的额外恒星伴星。我们在Palomar天文台用Robo-AO和PALM-3000自适应光学系统收集了系统的多历元图像，并提供了相对测光和天体测量。天体测量表明，伴星与它们各自的主星有共同的自行。这两颗新的伴星都预计与系外行星宿主星星的距离小于30 Au。利用投影分离计算新伴星的轨道周期，HD 2638的周期为130年，30 Ari B的周期为80年。以前的研究表明，真实的周期很可能在这些估计值的三倍之内。阿里30的额外组成部分使其成为第二个被证实拥有系外行星的四重系统。HD 2638拥有一颗热木星，新伴星的发现加强了热木星和双星之间的联系。我们把系统的颜色星等图，并得出质量的同伴，原来是大约0.5太阳质量的恒星。
We discuss two multiple star systems that host known exoplanets: HD 2638 and 30 Ari B. Adaptive optics imagery revealed an additional stellar companion to both stars. We collected multi-epoch images of the systems with Robo-AO and the PALM-3000 adaptive optics systems at Palomar Observatory and provide relative photometry and astrometry. The astrometry indicates that the companions share common proper motion with their respective primaries. Both of the new companions have projected separations less than 30 AU from the exoplanet host star. Using the projected separations to compute orbital periods of the new stellar companions, HD 2638 has a period of 130 yr and 30 Ari B has a period of 80 yr. Previous studies have shown that the true period is most likely within a factor of three of these estimated values. The additional component to 30 Ari makes it the second confirmed quadruple system known to host an exoplanet. HD 2638 hosts a hot Jupiter and the discovery of a new companion strengthens the connection between hot Jupiters and binary stars. We place the systems on a color–magnitude diagram and derive masses for the companions which turn out to be roughly 0.5 solar mass stars.
影响因子：
4.8
作者：
Armstrong, D. J.;Osborn, H. P.;Udry, S.
通讯作者：
Udry, S.