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, 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 GuyonJun 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 M. 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 Watanabe, John P. Wisniewski, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

We report that HAT-P-7 has a common proper motion stellar companion. The companion is located at ̃3''009 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 byWinn 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).

Original languageEnglish (US)
Article numberL7
JournalPublications of the Astronomical Society of Japan
Volume64
Issue number6
DOIs
StatePublished - Dec 25 2012
Externally publishedYes

Keywords

  • Stars: binaries: general
  • Stars: planetary systems: individual (HAT-P-7)
  • Techniques: high angular resolution
  • Techniques: photometric
  • Techniques: radial velocities

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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  • Cite this

    Narita, N., Takahashi, Y. H., Kuzuhara, M., Hirano, T., Suenaga, T., Kandori, R., Kudo, T., Sato, B., Suzuki, R., Ida, S., Nagasawa, M., Abe, L., Brandner, W., Brandt, T. D., Carson, J., Egner, S. E., Feldt, M., Goto, M., Grady, C. A., ... Tamura, M. (2012). A common proper motion stellar companion to HAT-P-7. Publications of the Astronomical Society of Japan, 64(6), [L7]. https://doi.org/10.1093/pasj/64.6.L7