Abstract
We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on 2007 November 12 (UT). This system is of special interest because of its 21 d period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be 62°±25°. Such a large spin-orbit misalignment, as well as the high eccentricity, could be explained as a relic of a previous gravitational interaction with other planets.
| Original language | English (US) |
|---|---|
| Pages (from-to) | L1-L5 |
| Journal | Publications of the Astronomical Society of Japan |
| Volume | 60 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2008 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
Keywords
- Stars: planetary systems: individual (HD 17156)
- Stars: rotation
- Techniques: photometric
- Techniques: radial velocities
- Techniques: spectroscopic
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