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arXiv 1602.00638astro-ph.EPastro-ph.SR
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K2-ESPRINT项目IV:一颗在顺行轨道上的热木星和一颗可能的伴星

The K2-ESPRINT Project IV: A Hot Jupiter in a Prograde Orbit with a Possible Stellar Companion

Teruyuki Hirano, Grzegorz Nowak, Masayuki Kuzuhara, Enric Palle, Fei Dai, Liang Yu, Vincent Van Eylen, Yoichi Takeda, Timothy D. Brandt, Norio Narita, Sergio Ve… 展开作者

Teruyuki Hirano, Grzegorz Nowak, Masayuki Kuzuhara, Enric Palle, Fei Dai, Liang Yu, Vincent Van Eylen, Yoichi Takeda, Timothy D. Brandt, Norio Narita, Sergio Velasco, Jorge Prieto Arranz, Roberto Sanchis-Ojeda, Joshua N. Winn, Tomoyuki Kudo, Nobuhiko Kusakabe, Akihiko Fukui, Bun'ei Sato, Simon Albrecht, Ignasi Ribas, Tsuguru Ryu, Motohide Tamura

摘要:

我们报告了在K2-34(EPIC~212110888)周围的3天轨道上发现和早期表征的热木星,K2 - 34是一颗富金属的F型恒星,位于K2周期5场中。我们的后续活动包括使用多个设施进行精确的径向速度(RV)测量和高对比度成像。在我们的高对比度数据中没有明亮的邻近光源,这表明类似凌日的信号不是由于这样一颗伴星的光变化造成的。我们密集的RV测量显示,K2- 34 b的质量为$1.773\pm0.086M_J$,确认了它作为行星的地位。我们还检测到K2- 34 b的Rossiter-McLaughlin效应,并表明该系统具有良好的自旋轨道对准($λ=-1_{-9}^{+10}$度)。斯巴鲁8.2米望远镜上的HiCIAO相机获得的高对比度图像显示了一个微弱的伴星($Δm_H=6.19\pm 0.11$ mag),距离为$0\farcs36$。需要进行后续观察,以确认伴星候选者与K2-34有身体上的联系。K2- 34 b似乎是典型的“热木星”的一个例子,尽管可以使用K2测光和地面跟踪的组合来精确地描述它的特征。

英文摘要:

We report on the detection and early characterization of a hot Jupiter in a 3-day orbit around K2-34 (EPIC~212110888), a metal-rich F-type star located in the K2 Cycle 5 field. Our follow-up campaign involves precise radial velocity (RV) measurements and high-contrast imaging using multiple facilities. The absence of a bright nearby source in our high-contrast data suggests that the transit-like signals are not due to light variations from such a companion star. Our intensive RV measurements show that K2-34b has a mass of $1.773\pm0.086M_J$, confirming its status as a planet. We also detect the Rossiter-McLaughlin effect for K2-34b and show that the system has a good spin-orbit alignment ($λ=-1_{-9}^{+10}$ degrees). High-contrast images obtained by the HiCIAO camera on the Subaru 8.2-m telescope reveal a faint companion candidate ($Δm_H=6.19\pm 0.11$ mag) at a separation of $0\farcs36$. Follow-up observations are needed to confirm that the companion candidate is physically associated with K2-34. K2-34b appears to be an example of a typical "hot Jupiter," albeit one which can be precisely characterized using a combination of K2 photometry and ground-based follow-up.

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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