Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.1401k&link_type=abstract
American Astronomical Society, ESS meeting #2, #14.01
Astronomy and Astrophysics
Astronomy
Scientific paper
3-D dynamical models of hot Jupiter atmospheres predict strong winds in the atmospheres of these planets. For tidally locked hot Jupiters, winds at high altitude in the planet's atmosphere advect heat from the day side to the cooler night side of the planet. Net wind speeds on the order of 1-10 km/s directed towards the night side of the planet are predicted at mbar pressures, which is the approximate pressure level probed by transmission spectroscopy. These winds should result in an observed blue shift of spectral lines in transmission on the order of the wind speed. Indeed, Snellen et al. (2010) recently observed a 2 (+/-) 1 km/s blue shift of CO transmission features for HD 209458b, which has been interpreted as a detection of the day-to-night winds that have been predicted by 3-D atmospheric dynamics modeling. In this talk, I present the results of a coupled 3-D atmospheric dynamics and transmission spectrum model, which predicts the Doppler-shifted spectrum of a hot Jupiter during transit resulting from winds in the planet's atmosphere. We show how Doppler shifted transmission spectra can be used to diagnose wind speeds in the planet's atmosphere, and in certain cases can be used to map wind speeds across the planet's terminator and as a function of altitude.
Kempton Eliza
Rauscher Emily
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