Search for outer massive bodies around transiting planetary systems: Candidates of faint stellar companions around HAT-P-7

Norio Narita, Tomoyuki Kudo, Carolina Bergfors, Makiko Nagasawa, Christian Thalmann, Bun'Ei Sato, Ryuji Suzuki, Ryo Kandori, Markus Janson, Miwa Goto, Wolfgang Brandner, Shigeru Ida, Lyu Abe, Joseph Carson, Sebastian E. Egner, Markus Feldt, Taras Golota, Olivier Guyon, Jun Hashimoto, Yutaka HayanoMasahiko Hayashi, Saeko S. Hayashi, Thomas Henning, Klaus W. Hodapp, Miki Ishh, Gillian R. Knapp, Nobuhiko Kusakabe, Masayuki Kuzuhara, Taro Matsuo, Michael W. McElwain, Shoken M. Mlyama, Jun Ichi Morino, Amaya Moro-Martin, Tetsuo Nlshlmura, Tae Soo Pyo, Eugene Serabyn, Takuya Suenaga, Hiroshi Suto, Yasuhiro Haruhi Takahashi, Michihiro Takami, Naruhisa Takato, Hiroshi Terada, Daigo Tomono, Edwin L. Turner, Makoto Watanabe, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


We present results of direct imaging observations for HAT-P-7 taken with the Subaru HiCIAO and the Calar Alto AstraLux. Since the close-in transiting planet HAT-P-7b was reported to have a highly tilted orbit, massive bodies such as giant planets, brown dwarfs, and a binary star are expected to exist in the outer region of this system. We show that there are indeed two candidates for distant faint stellar companions around HAT-P-7. We discuss how such companions can play a role on the orbital evolution of HAT-P-7b. We conclude that since there is a third body in the system, as reported by Winn et al. (2009, ApJ, 763, L99), Kozai migration is less likely, while planet-planet scattering is possible.

Original languageEnglish (US)
Pages (from-to)779-786
Number of pages8
JournalPublications of the Astronomical Society of Japan
Issue number3
StatePublished - 2010

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Binaries
  • General-stars
  • High angular resolution
  • Individual (HAT-P-7)-techniques
  • Planetary systems
  • Stars


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