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 Velasco, Jorge Prieto Arranz, Roberto Sanchis-Ojeda, Joshua N. Winn, Tomoyuki Kudo, Nobuhiko Kusakabe, Akihiko Fukui, Bun'Ei Sato, Simon Albrecht, Ignasi RibasTsuguru Ryu, Motohide Tamura

Research output: Contribution to journalArticle

12 Scopus citations

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.

Original languageEnglish (US)
Article number53
JournalAstrophysical Journal
Volume825
Issue number1
DOIs
StatePublished - Jul 1 2016

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • planets and satellites: detection
  • stars: individual (EPIC 212110888 K2-34)
  • techniques: photometric
  • techniques: radial velocities-techniques: spectroscopic

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    Hirano, T., Nowak, G., Kuzuhara, M., Palle, E., Dai, F., Yu, L., Van Eylen, V., Takeda, Y., Brandt, T. D., Narita, N., Velasco, S., Arranz, J. P., Sanchis-Ojeda, R., Winn, J. N., Kudo, T., Kusakabe, N., Fukui, A., Sato, BE., Albrecht, S., ... Tamura, M. (2016). THE K2-ESPRINT PROJECT IV. A HOT JUPITER in A PROGRADE ORBIT with A POSSIBLE STELLAR COMPANION. Astrophysical Journal, 825(1), [53]. https://doi.org/10.3847/0004-637X/825/1/53