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SUMMARY:From cross-correlations to likelihoods: What can we do with high-r
 esolution transmission spectroscopy?
DTSTART;VALUE=DATE-TIME:20220908T074500Z
DTEND;VALUE=DATE-TIME:20220908T080000Z
DTSTAMP;VALUE=DATE-TIME:20241101T160820Z
UID:indico-contribution-122@meetings.aip.de
DESCRIPTION:Speakers: Neale Gibson (Trinity College Dublin)\nHigh-resoluti
 on Doppler-resolved spectroscopy has opened up a new window into the atmos
 pheres of both transiting and non-transiting exoplanets. While the 'classi
 cal' cross-correlation approach is efficient for finding atomic and molecu
 lar species\, it is quite limited with its inability to recover quantitati
 ve information on the atmosphere such as abundances and temperature profil
 es - the very information we need to understand planetary atmospheres! Her
 e\, I will outline a new retrieval framework based on a simple Gaussian li
 kelihood coupled to a fast model-filtering technique that is critical to a
 ccount for the common pre-processing steps performed on time-series spectr
 a. I will demonstrate its use including the first retrievals of high-resol
 ution transmission spectra\, showcasing multiple detections of neutral and
  ionised metals (Fe\, V\, Mg\, Cr\, FeII\, etc) in ultra-hot Jupiters\, wh
 ich in turn place robust and precise constraints on abundance ratios and t
 emperature-pressure profiles\, as well as directly constrain the mean line
 -profile. However\, to fully realise the power of high-resolution spectros
 copy - which is sensitive to winds and atmospheric escape - it is clear th
 at we need to treat highly irradiated planets as 3D objects. This is incom
 patible with the requirement for ultra-fast forward model atmospheres whic
 h make high-resolution retrievals viable in the first place. I will finish
  by discussing some open questions and current limitations of high-resolut
 ion atmospheric retrievals\, with the goal of encouraging discussion of th
 e best routes forward.\n\nhttps://iaus379.aip.de/event/16/contributions/12
 2/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://iaus379.aip.de/event/16/contributions/122/
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