TY - JOUR
T1 - THE K2-ESPRINT PROJECT IV. A HOT JUPITER in A PROGRADE ORBIT with A POSSIBLE STELLAR COMPANION
AU - Hirano, Teruyuki
AU - Nowak, Grzegorz
AU - Kuzuhara, Masayuki
AU - Palle, Enric
AU - Dai, Fei
AU - Yu, Liang
AU - Van Eylen, Vincent
AU - Takeda, Yoichi
AU - Brandt, Timothy D.
AU - Narita, Norio
AU - Velasco, Sergio
AU - Arranz, Jorge Prieto
AU - Sanchis-Ojeda, Roberto
AU - Winn, Joshua N.
AU - Kudo, Tomoyuki
AU - Kusakabe, Nobuhiko
AU - Fukui, Akihiko
AU - Sato, Bun'Ei
AU - Albrecht, Simon
AU - Ribas, Ignasi
AU - Ryu, Tsuguru
AU - Tamura, Motohide
N1 - Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.
PY - 2016/7/1
Y1 - 2016/7/1
N2 - 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.
AB - 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.
KW - planets and satellites: detection
KW - stars: individual (EPIC 212110888 K2-34)
KW - techniques: photometric
KW - techniques: radial velocities-techniques: spectroscopic
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U2 - 10.3847/0004-637X/825/1/53
DO - 10.3847/0004-637X/825/1/53
M3 - Article
AN - SCOPUS:84978238240
SN - 0004-637X
VL - 825
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 53
ER -