Stellar Spin-Orbit Alignment for Kepler-9, a Multi-transiting Planetary System with Two Outer Planets Near 2:1 Resonance

We present spectroscopic measurements of the Rossiter-McLaughlin effect for the planet b of the Kepler-9 multi-transiting planetary system. The resulting sky-projected spin-orbit angle is λ = −13° 16°, which favors an aligned system and strongly disfavors highly misaligned, polar, and retrograde orb...

Full description

Saved in:
Bibliographic Details
Published in:The Astronomical journal 2018-02, Vol.155 (2), p.70
Main Authors: Wang, Songhu, Addison, Brett, Fischer, Debra A., Brewer, John M., Isaacson, Howard, Howard, Andrew W., Laughlin, Gregory
Format: Article
Language:English
Subjects:
Alignment
Astronomy
methods: observational
Orbital resonances (celestial mechanics)
Planetary systems
Planets
planets and satellites: individual (Kepler-9b)
Retrograde orbits
stars: individual (Kepler-9)
techniques: radial velocities
techniques: spectroscopic
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present spectroscopic measurements of the Rossiter-McLaughlin effect for the planet b of the Kepler-9 multi-transiting planetary system. The resulting sky-projected spin-orbit angle is λ = −13° 16°, which favors an aligned system and strongly disfavors highly misaligned, polar, and retrograde orbits. Including Kepler-9, there are now a total of four Rossiter-McLaughlin effect measurements for multiplanet systems, all of which are consistent with spin-orbit alignment.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/aaa2fb