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Atmospheric Retrieval of Exoplanets

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How do we measure what exoplanet atmospheres are made of? As we move closer to observations of Earth-like atmospheres, exoplanet researcher Ryan MacDonald (Cambridge, UK) explains how astronomers retrieve the atmospheric properties of exoplanets.
-----Further information and links-----
*Recent reviews of exoplanet atmosphere research:
*An excellent textbook on exoplanet atmosphere theory:
*The first exoplanet atmosphere retrieval paper (Madhusudhan & Seager, 2009):
*'The presence of methane in the atmosphere of an extrasolar planet' (Swain et al. 2008):
*'HD 209458b in New Light' (Ryan's MNRAS paper):
[Contains an overview of exoplanet atmospheric retrieval for transmission spectra]
-Online version:
-Open access pdf (pre-typset author's manuscript):
*The James Webb Space Telescope (JWST):
*Hubble Space Telescope Wide Field Camera 3 (WFC3):
The schematic diagrams, cross section plots, and transmission spectra illustrations were produced by Ryan MacDonald, making use of the POSEIDON radiative transfer and retrieval algorithm.
-----Further information and links-----
*Recent reviews of exoplanet atmosphere research:
*An excellent textbook on exoplanet atmosphere theory:
*The first exoplanet atmosphere retrieval paper (Madhusudhan & Seager, 2009):
*'The presence of methane in the atmosphere of an extrasolar planet' (Swain et al. 2008):
*'HD 209458b in New Light' (Ryan's MNRAS paper):
[Contains an overview of exoplanet atmospheric retrieval for transmission spectra]
-Online version:
-Open access pdf (pre-typset author's manuscript):
*The James Webb Space Telescope (JWST):
*Hubble Space Telescope Wide Field Camera 3 (WFC3):
The schematic diagrams, cross section plots, and transmission spectra illustrations were produced by Ryan MacDonald, making use of the POSEIDON radiative transfer and retrieval algorithm.
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