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

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

We report that HAT-P-7 has a common proper motion stellar companion. The companion is located at $ \sim$ 3 $ .\!\!\!''$ 9 to the east and estimated to be an M5.5V dwarf based on its colors. We also confirm the presence of a third companion, which was first reported by Winn et al. (2009, Ap...

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Veröffentlicht in:Publications of the Astronomical Society of Japan 2012-12, Vol.64 (6)
Hauptverfasser: Narita, Norio, Takahashi, Yasuhiro H., Kuzuhara, Masayuki, Hirano, Teruyuki, Suenaga, Takuya, Kandori, Ryo, Kudo, Tomoyuki, Sato, Bun'ei, Suzuki, Ryuji, Ida, Shigeru, Nagasawa, Makiko, Abe, Lyu, Brandner, Wolfgang, Brandt, Timothy D., Carson, Joseph, Egner, Sebastian E., Feldt, Markus, Goto, Miwa, Grady, Carol A., Guyon, Olivier, Hashimoto, Jun, Hayano, Yutaka, Hayashi, Masahiko, Hayashi, Saeko S., Henning, Thomas, Hodapp, Klaus W., Ishii, Miki, Iye, Masanori, Janson, Markus, Knapp, Gillian R., Kusakabe, Nobuhiko, Kwon, Jungmi, Matsuo, Taro, Mayama, Satoshi, Mcelwain, Michael W., Miyama, Shoken M., Morino, Jun-Ichi, Moro-Martin, Amaya, Nishimura, Tetsuo, Pyo, Tae-Soo, Serabyn, Eugene, Suto, Hiroshi, Takami, Michihiro, Takato, Naruhisa, Terada, Hiroshi, Thalmann, Christian, Tomono, Daigo, Turner, Edwin L., Watanabe, Makoto, Wisniewski, John P., Yamada, Toru, Takami, Hideki, Usuda, Tomonori, Tamura, Motohide
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Sprache:eng
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Zusammenfassung:We report that HAT-P-7 has a common proper motion stellar companion. The companion is located at $ \sim$ 3 $ .\!\!\!''$ 9 to the east and estimated to be an M5.5V dwarf based on its colors. We also confirm the presence of a third companion, which was first reported by Winn et al. (2009, ApJ, 703, L99), based on long-term radial velocity measurements. We revisit the migration mechanism of HAT-P-7b given to the presence of those companions, and propose the 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, ApJ, 757, 18).
ISSN:0004-6264
2053-051X
DOI:10.1093/pasj/64.6.L7