Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812805h&link_type=abstract
American Astronomical Society, AAS Meeting #218, #128.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The Rossiter-McLaughlin (RM) effect is a radial velocity anomaly during a planetary transit caused by a partial occultation of the rotating stellar disk. Measurements of the RM effect tell us the sky-projected angle between the stellar spin axis and the planetary orbital axis. This angle is associated with the dynamical history of close-in planets and so very important to test theoretical hypotheses regarding planetary migration. So far, the interpretation of the radial velocity anomaly has been based mainly on analytic approximations with limited applicability, or with numerical simulations. We have developed a new and more accurate analytic formula which specifies the RM velocity anomaly in terms of the position of the planet, the stellar spin velocity, and other intrinsic line parameters such as macroturbulence. Although our formula is derived for the case in which the radial velocity anomaly is derived from a cross-correlation analysis, the formula also gives a good agreement with the simulated results based on the forward-modeling approach that is used for spectra obtained with an iodine gas cell. We discuss the results of reanalyses of the RM effect for several selected transiting systems with our new analytic formula and show that it is a useful new tool for precise estimations of planetary parameters.
Albrecht Simon
Hirano Teruyuki
Narita Norio
Sato Bun'ei
Suto Yasushi
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