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SUMMARY:Effect of Stellar activity on the atmosphere of hot Jupiters and t
 heir transit signatures.
DTSTART;VALUE=DATE-TIME:20220908T144500Z
DTEND;VALUE=DATE-TIME:20220908T150000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115921Z
UID:indico-contribution-123@meetings.aip.de
DESCRIPTION:Speakers: Gopal Hazra (Department of Astrophysics\, University
  of Vienna)\nThe evolution of planetary atmospheres is very much dependent
  on the environment of their host stars (e.g.\, stellar radiation\, stella
 r wind\, stellar flares and Coronal Mass Ejections (CMEs)). For close-in p
 lanets\, the stellar radiation evaporates the planetary atmosphere as a fo
 rm of supersonic planetary outflow due to photoionization. This planetary 
 outflow further interacts with the stellar wind\, which shapes up the plan
 etary atmosphere (sometimes producing a comet-like structure) and its mass
  loss rate. Moreover\, flares and CMEs from the star will also have a grea
 t impact on planetary evaporation. In this talk\, I will discuss the effec
 t of stellar wind\, and the impact of flares and CMEs on the atmosphere of
  hot Jupiters using a self-consistent 3D radiation hydrodynamic model. Amo
 ng all the considered stellar environments\, we find that CMEs are very ef
 fective in eroding planetary atmospheres. We also calculate synthetic Lyma
 n-alpha transit signatures and find that the flare alone cannot explain th
 e observed high blue shifted velocities seen in the Lyman-alpha observatio
 n. The CME\, however\, leads to an increase in the velocity of the escapin
 g atmosphere\, enhancing the transit depth at high blue shifted velocities
 . Finally\, I will also discuss the effect of the different orientations o
 f the CME magnetic field on the atmospheric escape and corresponding trans
 it signatures.\n\nhttps://meetings.aip.de/event/16/contributions/123/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/16/contributions/123/
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