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Hirano, Teruyuki; Nowak, Grzegorz; Kuzuhara, Masayuki; Palle, Enric; Dai, Fei; Yu, Liang; Van Eylen, Vincent; Takeda, Yoichi; Brandt, Timothy D.; Narita, Norio; Velasco, Sergio; Arranz, Jorge Prieto; Sanchis-Ojeda, Roberto; Winn, Joshua N.; Kudo, Tomoyuki; Kusakabe, Nobuhiko; Fukui, Akihiko; Sato, Bun'ei; Albrecht, Simon; Ribas, Ignasi; Ryu, Tsuguru; Tamura, Motohide
The Astrophysical journal, 07/2016, Letnik: 825, Številka: 1Journal Article
ABSTRACT We report on the detection and early characterization of a hot Jupiter in a three 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 (EPIC 212110888b) has a mass of , 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 ( degrees). High-contrast images obtained by the HiCIAO camera on the Subaru 8.2 m telescope reveal a faint companion candidate (CC) ( mag) at a separation of . Follow-up observations are needed to confirm that the CC 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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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