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 language | English (US) |
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Article number | L7 |
Journal | Publications of the Astronomical Society of Japan |
Volume | 64 |
Issue number | 6 |
DOIs | |
State | Published - Dec 25 2012 |
Externally published | Yes |
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