Transit of a Spherical Planet of a Stellar Chromosphere which is Geometrically Thin

Details Transit of a Spherical Planet of a Stellar Chromosphere which is Geometrically Thin Transit of a Spherical Planet of a Stellar Chromosphere which is Geometrically Thin

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ascl.soft11018s&link_type=abstract

Astrophysics Source Code Library, record ascl:1011.018

Astronomy and Astrophysics

Astrophysics

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 Si IV absorption model has R_p,SIV/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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