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arxiv: 1209.4422 · v1 · pith:GF4JTCYEnew · submitted 2012-09-20 · 🌌 astro-ph.EP · astro-ph.SR

A Common Proper Motion Stellar Companion to HAT-P-7

Norio Narita , Yasuhiro H. Takahashi , Masayuki Kuzuhara , Teruyuki Hirano , Takuya Suenaga , Ryo Kandori , Tomoyuki Kudo , Bun'ei Sato
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Ryuji Suzuki Shigeru Ida Makiko Nagasawa Lyu Abe Wolfgang Brandner Timothy D. Brandt Joseph Carson Sebastian E. Egner Markus Feldt Miwa Goto Carol A. Grady Olivier Guyon Jun Hashimoto Yutaka Hayano Masahiko Hayashi Saeko S. Hayashi Thomas Henning Klaus W. Hodapp Miki Ishii Masanori Iye Markus Janson Gillian R. Knapp Nobuhiko Kusakabe Jungmi Kwon Taro Matsuo Satoshi Mayama Michael W. McElwain Shoken Miyama Jun-ichi Morino Amaya Moro-Martin Tetsuo Nishimura Tae-Soo Pyo Eugene Serabyn Hiroshi Suto Michihiro Takami Naruhisa Takato Hiroshi Terada Christian Thalmann Daigo Tomono Edwin L. Turner Makoto Watanab John P. Wisniewski Toru Yamada Hideki Takami Tomonori Usuda Motohide Tamara
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classification 🌌 astro-ph.EP astro-ph.SR
keywords companioncommonhat-p-7hat-p-7bmigrationmotionpresenceproper
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We report that HAT-P-7 has a common proper motion stellar companion. The companion is located at $\sim3.9$ arcsec to the east and estimated as an M5.5V dwarf based on its colors. We also confirm the presence of the third companion, which was first reported by Winn et al. (2009), based on long-term radial velocity measurements. We revisit the migration mechanism of HAT-P-7b given the presence of those companions, and propose sequential Kozai migration as a likely scenario in this system. This scenario may explain the reason for an outlier in the discussion of the spin-orbit alignment timescale for HAT-P-7b by Albrecht et al. (2012).

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