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SUMMARY:Variable atmospheric dynamics of planets experiencing gravity-dark
 ened seasons
DTSTART;VALUE=DATE-TIME:20220907T103000Z
DTEND;VALUE=DATE-TIME:20220907T104500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115908Z
UID:indico-contribution-124@meetings.aip.de
DESCRIPTION:Speakers: Anusha Pai Asnodkar (The Ohio State University)\nPla
 nets on misaligned orbits around rapid rotators can experience “gravity-
 darkened seasons” as their orbits cross over the hot poles and cooler eq
 uators of rotationally-flattened stars. The periodically variable heating 
 from these seasons presents a unique case for exploring how changes in ste
 llar irradiation influence planetary atmospheric dynamics. We perform a ho
 mogeneous analysis of day-to-nightside winds on the ultra-hot Jupiters KEL
 T-9 b and KELT-20 b\, enabling the comparison of a planet experiencing gra
 vity-darkened seasons (KELT-9 b) with a similar planet that does not (KELT
 -20 b). We conduct high-resolution transmission spectroscopy using two tra
 nsits observed by the PEPSI spectrograph on the Large Binocular Telescope 
 to empirically constrain supersonic ~10 km/s day-to-nightside winds traced
  by Fe II features in the atmosphere of KELT-9 b. Reconciling our findings
  with two archival HARPS-N datasets suggests multi-epoch variability ~5-8 
 km/s over timescales between weeks to years. In contrast\, KELT-20 b’s d
 ay-to-nightside winds are less rapid (~2 km/s) and stable across four tran
 sits collectively observed by PEPSI and HARPS-N. The observed contrast of 
 KELT-9 b’s wind variability and KELT-20 b’s stability is in accordance
  with our intuition on the effect of gravity-darkened seasons. A qualitati
 ve evaluation of our measured wind velocities and variability against curr
 ent ultra-hot Jupiter GCMs reveals that KELT-9 b poses unique challenges f
 or validating giant planet atmospheric models.\n\nhttps://meetings.aip.de/
 event/16/contributions/124/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/16/contributions/124/
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