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SUMMARY:Sodium in the atmosphere of WASP-7 b observed with UVES
DTSTART;VALUE=DATE-TIME:20220907T144500Z
DTEND;VALUE=DATE-TIME:20220907T150000Z
DTSTAMP;VALUE=DATE-TIME:20241101T160820Z
UID:indico-contribution-121@meetings.aip.de
DESCRIPTION:Speakers: Hossein Rahmati (Bu-Ali Sina University)\nContext. T
 ransmission spectroscopy is a prime technique to study the chemical compos
 ition and structure of exoplanetary atmospheres. Strong excess absorption 
 signals have been detected in the optical Na I D1\, 2 Fraunhofer lines dur
 ing transits of hot Jupiters\, which are attributed to the planetary atmos
 pheres and allow us to constrain its structure.\nAims. We study the atmosp
 here of WASP-7 b by means of high-resolution transit spectroscopy in the s
 odium lines.\nMethods. We analyze a spectral transit time-series of 89 hig
 h-resolution spectra of the hot Jupiter WASP-7 b that was observed using t
 he Ultraviolet and Visual Echelle Spectrograph (UVES). We use the telluric
  lines for an accurate alignment of the spectra and carry out a telluric c
 orrection with molecfit. Stellar magnetic activity is monitored by investi
 gating chromospheric lines such as the Ca ii\nH and K and hydrogen Hα lin
 es. Finally\, we obtain transmission spectra and light curves in the sodiu
 m lines region.\nResults. The star shows no identifiable flares and\, if a
 ny\, marginal changes in activity during our observing run. The sodium tra
 nsmission spectra and corresponding light curves clearly show signs of the
  Rossiter-McLaughlin effect (RM) and the stellar center-to-limb variation 
 (CLV) that we model using synthetic spectra. A statistically significant\,
  narrow absorption feature with a line contrast of 0.47 ± 0.06 % and a FW
 HM of 0.13 ± 0.03 Å is detected at the location of the Na I D2 line. For
  the Na I D1 line signal\, we derive an upper limit of 0.12 %.\n\nhttps://
 iaus379.aip.de/event/16/contributions/121/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://iaus379.aip.de/event/16/contributions/121/
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