Seminars at FGG
Hydrogen Balmer lines in the transmission spectrum of the ultra-hot Jupiter KELT-20b/MASCARA-2b
Speaker: Federico Biassoni (Universita' degli Studi dell'Insubria di Como)
Date and time: 2023-03-01 11:30
Ultra-Hot Jupiter (UHJ) are the most sought after among the class of exoplanets. They are Gas-Giants receiving an extreme XUV and FUV flux from the host star due to their close-in orbit causing an inflated atmosphere and extreme high temperature. Thanks to their high equilibrium temperature > 2200 K and large pressure scale height, molecules and atoms are easily detected during transits. Recent studies confirmed an inverse temperature profile in the dayside, furthermore, it seems that Non-Local-Thermodynamic-Equilibrium (NLTE) forward modelling describe better the behaviour of these atmospheres than a LTE model. We aim at extracting the transmission spectrum of the HI Balmer lines of the planet KELT-20b/MASCARA-2b, a typical UHJ, and compare the results with a LTE and NLTE atmospheric forward model.