Exo-Planetary Transits of Limb Brightened Lines

Details Exo-Planetary Transits of Limb Brightened Lines Exo-Planetary Transits of Limb Brightened Lines

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734302s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #343.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Transit light curves for stellar continua have only one minimum and a "U" shape. By contrast, transit curves for optically thin chromospheric emission lines can have a "W" shape because of stellar limb-brightening. We calculate light curves for an optically thin shell of emission and fit these models to time-resolved observations of Si IV absorption by the planet HD209458b. We find that the best fit SiIV absorption model has Rp,SiIV/R* = 0.34 +0.07 -0.12, similar to the Roche lobe of the planet. While the large radius is only at the limit of statistical significance, we develop formulae applicable to transits of all optically thin chromospheric emission lines.

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