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SUMMARY:High-resolution spectroscopic detection of atmospheric sodium on l
 ong-transiting inflated exoplanet KELT-11b
DTSTART;VALUE=DATE-TIME:20220907T100000Z
DTEND;VALUE=DATE-TIME:20220907T101500Z
DTSTAMP;VALUE=DATE-TIME:20241101T160813Z
UID:indico-contribution-140@meetings.aip.de
DESCRIPTION:Speakers: Dany Mounzer (University of Geneva)\nState-of-the-ar
 t spectrographs on large ground-based telescopes have allowed significant 
 discoveries in the structure\, composition and dynamic processes of exopla
 netary atmospheres through high-resolution transit spectroscopy. However\,
  observations from ground-based facilities face two major challenges : The
  day-night cycle limits the length of observations\, and incoming signals 
 are distorted by Earth's atmosphere. The latter can be solved by adaptive 
 optics and precise telluric correction\, but the former is an issue for tr
 ansit spectroscopy. This restricts the observable planets to ones with tra
 nsit duration smaller than five hours.\n\nExtremely inflated exoplanet KEL
 T-11b is affected by this issue\, as it transits its host star for more th
 an seven hours. To bypass this limitation\, we observed this system for se
 ries of three consecutive days: Before\, during and after the transit\, in
  order to collect a large number of in-transit and out-of-transit baseline
  spectra. This allowed the computation of a strong signal-to-noise high-re
 solution combined transmission spectrum. The individual spectra were corre
 cted for telluric absorption using ESO atmospheric transmission code Molec
 fit.\n\nThis resulting transmission spectrum shows conclusive evidence of 
 excess atomic sodium absorption through the 5'900 Å doublet of 0.29±0.05
  % and 0.50±0.06 % in the Na D1 and D2 lines respectively. We model for w
 ind patterns and find day-to-night side winds with surprisingly no vertica
 l winds\, considering KELT-11b's extreme scale height of 2'763 km. We also
  highlight the robustness of our three-day observation method which allows
  the study of exoplanets with long transits that haven't been studied with
  high-resolution ground-based spectrographs.\n\nOther recent results from 
 TESS\, HST and CHEOPS combined with KELT-11b's hot atmosphere\, bright hos
 t star\, long transit\, sub-Saturn mass and great bloatedness make it a un
 ique and ideal candidate for atmospheric characterization with the next ge
 neration of telescopes\, especially from space.\n\nhttps://iaus379.aip.de/
 event/16/contributions/140/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://iaus379.aip.de/event/16/contributions/140/
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