THE K2-ESPRINT PROJECT IV. A HOT JUPITER IN A PROGRADE ORBIT WITH A POSSIBLE STELLAR COMPANION
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Hirano_2016_ApJ_825_53.pdf
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Author(s)
Hirano, Teruyuki
Nowak, Grzegorz
Kuzuhara, Masayuki
Palle, Enric
Dai, Fei
Van Eylen, Vincent
Takeda, Yoichi
Brandt, Timothy D.
Narita, Norio
Velasco, Sergio
Date Issued
June 2016
Journal
The Astrophysical Journal
Publisher
American Astronomical Society
Citation
Hirano, Teruyuki, et al. “THE K2 -ESPRINT PROJECT IV. A HOT JUPITER IN A PROGRADE ORBIT WITH A POSSIBLE STELLAR COMPANION.” The Astrophysical Journal, vol. 825, no. 1, June 2016, p. 53. © 2016 The American Astronomical Society.
Version
Final published version
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 1.773 ± 0.086M[subscript 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[superscript +10][subscript -9] degrees). High-contrast images obtained by the HiCIAO camera on the Subaru 8.2 m telescope reveal a faint companion candidate (CC) (Δm[subscript H] = 6.19 ± 0.11 mag) at a separation of 0.'' 36. 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. Key words: planets and satellites: detection – stars: individual (EPIC 212110888, K2-34) techniques:
photometric – techniques: radial velocities – techniques: spectroscopic
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/0004-637X/825/1/53
