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
TL;DR
This paper reports the discovery of a stellar companion to HAT-P-7 and discusses how these companions influence the planet HAT-P-7b's migration, proposing a sequential Kozai mechanism as a plausible explanation.
Contribution
It identifies a new stellar companion to HAT-P-7 and revisits the planet's migration history, proposing sequential Kozai migration as a novel scenario.
Findings
Discovery of a common proper motion M5.5V stellar companion to HAT-P-7.
Confirmation of a third companion via radial velocity measurements.
Proposal that sequential Kozai migration explains HAT-P-7b's orbital characteristics.
Abstract
We report that HAT-P-7 has a common proper motion stellar companion. The companion is located at 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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