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SUMMARY:Spatially-resolving the terminator: Variation of Fe\, temperature 
 and winds in WASP-76~b across planetary limbs and orbital phase
DTSTART;VALUE=DATE-TIME:20220908T130000Z
DTEND;VALUE=DATE-TIME:20220908T131500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115919Z
UID:indico-contribution-116@meetings.aip.de
DESCRIPTION:Speakers: Siddharth Gandhi ()\nExoplanet atmospheres are inher
 ently three-dimensional systems in which thermal/chemical variation and wi
 nds can strongly influence spectra. Recently\, the ultra-hot Jupiter WASP-
 76~b has shown evidence for condensation and asymmetric Fe absorption with
  time. However\, it is unclear whether these asymmetries are driven by che
 mical or thermal differences between the two limbs\, as precise constraint
 s on variation in these have remained elusive due to the challenges of mod
 elling these dynamics in a Bayesian framework as well as the procurement o
 f such high quality observations. To address this we develop a new model\,
  HyDRA-2D\, capable of simultaneously retrieving morning and evening termi
 nators with day-night winds\, and use this on recent high-precision termin
 ator observations of WASP-76~b with ESPRESSO/VLT. We explore variations in
  Fe\, temperature profile\, winds and opacity deck with limb and orbital p
 hase. In this talk I will show that with HyDRA-2D we find Fe is more promi
 nent on the evening for the last quarter of the transit. On the other hand
  the morning shows a lower abundance with a wider uncertainty\, driven by 
 degeneracy with the opacity deck and because the stronger evening signal d
 ominates the overall spectrum. We also constrain a trend of higher tempera
 tures for the more irradiated atmospheric regions\, and a higher wind spee
 d for the last quarter of the transit than the first. This new spatially- 
 and phase-resolved treatment is statistically favoured by 4.9$\\sigma$ ove
 r traditional 1D-retrievals\, and thus demonstrates the power of such mode
 lling for robust constraints with current and future facilities.\n\nhttps:
 //meetings.aip.de/event/16/contributions/116/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/16/contributions/116/
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