Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.0105c&link_type=abstract
American Astronomical Society, DPS meeting #38, #01.05; Bulletin of the American Astronomical Society, Vol. 38, p.481
Other
Scientific paper
We have observed the Rossiter-McLaughlin Effect during four transits of HD189733b across the disk of its parent star. This effect is the perturbation on the apparent radial velocities of the star caused by the planet blocking part of the Doppler-shifted light from the rotating star. Measurement of this effect is highly diagnostic of the degree of alignment of the planetary orbital axis with the stellar spin axis. We present data from two partial transits observed with the HET, and from two full transits observed with the McDonald Observatory 2.7m Harlan Smith Telescope. We model this effect by first computing stellar photospheric line profile shapes from each surface element of a model rotating star. We then compute the disk integrated line profile as a function of time through a transit event as the planet successively blocks surface elements from one side of the rotating star to the other. The centroid of this model line profile then gives the stellar radial velocity perturbation due to the transit. This work was supported by NASA grant NNG05G107G.
Cochran William D.
Endl Michael
Hatzes Artie P.
Wittenmyer Robert A.
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