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SUMMARY:Tantalising signs of H$_2$O in the cloudy atmosphere of a warm Nep
 tune from High-Resolution Spectroscopy
DTSTART;VALUE=DATE-TIME:20220909T081500Z
DTEND;VALUE=DATE-TIME:20220909T083000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115923Z
UID:indico-contribution-115@meetings.aip.de
DESCRIPTION:Speakers: Spandan Dash (Department of Physics\, University of 
 Warwick)\nCharacterization of cooler atmospheres of super-Earths and Neptu
 ne sized objects at low-resolution is often thwarted by the presence of cl
 ouds\, hazes and aerosols which effectively flatten the transmission spect
 ra. High-Resolution Spectroscopy (HRS) presents an opportunity to overcome
  this limitation by having the ability to detect molecular species whose s
 pectral line cores extend above the level of clouds in these atmospheres. 
 We analyse High-Resolution observations of the warm Neptune GJ 3470b taken
  over one transit using CARMENES (R ~ 80400) and two transits using GIANO 
 (R ~ 50000) and look at the possibility of signatures for first H$_2$O in 
 isolation and then H$_2$O and CH$_4$ together. We find a tentative detecti
 on of H$_2$O using either the peak of the cross correlation signal or a cr
 oss-correlation-to-likelihood metric while comparing it to just the best f
 it model\, when all three nights are combined. The detection becomes even 
 weaker when both H$_2$O and CH$_4$ are used for abundance and cloud deck l
 ayer values close to the best fit model. This decrease is in line with res
 ults from the Hubble Space Telescope\, at much lower resolution. However\,
  accounting for the effects of data analysis on the compared model produce
 s a strong detection close to the expected exoplanet position using just o
 ne night of CARMENES. Following this\, we are planning to use a Bayesian r
 etrieval tool to put simultaneous constraints on the abundance of molecula
 r species and the pressure of the cloud top-deck. Such a tool will also al
 low us to directly compare/combine our results with published HST observat
 ions.\n\nhttps://meetings.aip.de/event/16/contributions/115/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/16/contributions/115/
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