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Draft version June 29, 2010 Preprint typeset using LATEX style emulateapj v. 11/10/09
 

Summary: Draft version June 29, 2010
Preprint typeset using LATEX style emulateapj v. 11/10/09
EXO-PLANETARY TRANSITS OF LIMB BRIGHTENED LINES;
SI IV ABSORPTION BY HD209458B
E. Schlawin1
, E. Agol2
, L. M. Walkowicz3
, K. Covey1,4,5
, and J. P. Lloyd1
Draft version June 29, 2010
ABSTRACT
Transit light curves for stellar continua and optically thick emission lines 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 Rp,Si IV/R = 0.34+0.7
-0.12, similar to
the Roche lobe of the planet.
Subject headings: extrasolar planets: transit detections stellar chromospheres
1. INTRODUCTION

  

Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara

 

Collections: Physics