Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2010-03-11
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
10 pages, 3 figures, 3 tables, PASJ in press
Scientific paper
We report new radial velocities of the TrES-4 transiting planetary system, including observations of a full transit, with the High Dispersion Spectrograph of the Subaru 8.2m telescope. Modeling of the Rossiter-McLaughlin effect indicates that TrES-4b has closely aligned orbital and stellar spin axes, with $\lambda = 6.3^{\circ} \pm 4.7^{\circ}$. The close spin-orbit alignment angle of TrES-4b seems to argue against a migration history involving planet-planet scattering or Kozai cycles, although there are two nearby faint stars that could be binary companion candidates. Comparison of our out-of-transit data from 4 different runs suggest that the star exhibits radial velocity variability of $\sim$20 ms^-1 in excess of a single Keplerian orbit. Although the cause of the excess radial velocity variability is unknown, we discuss various possibilities including systematic measurement errors, starspots or other intrinsic motions, and additional companions besides the transiting planet.
Aoki Wako
Hirano Teruyuki
Narita Norio
Sato Bun'ei
Tamura Motohide
No associations
LandOfFree
Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial Velocity Variation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial Velocity Variation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial Velocity Variation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-540044