Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21811203c&link_type=abstract
American Astronomical Society, AAS Meeting #218, #112.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The Rossiter-McLaughlin (RM) effect causes a transiting planet to perturb the spectral line shape of stellar photospheric lines. This perturbation is generally interpreted as a anomalous Doppler shift of the stellar lines during transit, and the time profile of this shift is highly diagnostic of the projected inclination of the stellar orbital angular momentum vector to the stellar rotational angular momentum. This method was used to help confirm Kepler-8b (Jenkins et al. 2010 ApJ 724 1108). For the case of very rapid stellar rotation, the RM effect is manifested by a bump moving across the rotationally broadened stellar line profile. Since such a bump is not easily interpreted as an anomalous Doppler shift, instead Doppler Tomography techniques offer the possibility of confirming planets orbiting these rapidly rotating stars. This is a valuable new tool, as these stars are rotating too rapidly for standard high precision radial velocity measurements to confirm the existence of planets by the standard measurement of the stellar Doppler reflex motion. We will also explore the possibility of using Rossiter-McLaughlin data during transits to confirm the existence of very small planets that would give Doppler reflex wobbles during their orbits that are too small to measure with current RV precision.
Cochran William D.
Kepler Science Team
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