Patricio Cubillos – An Homogeneous Retrieval Study of Exoplanet Transmission Spectra


“An Homogeneous Retrieval Study of Exoplanet Transmission Spectra”

Patricio Cubillos

Space Research Institute, Austrian Academy of Science

Thanks mainly to the Hubble and Spitzer Space Telescopes, today there are dozens of exoplanets with multi-wavelength transmission spectra. However, despite being some of the most valuable observations in existence, retrieval analyses have revealed our difficulties in establishing stringent constraints on the atmospheric properties of these planets. Given the complexity of atmospheric modeling and retrieval tools, multiple independent analyses are a valuable exersize to highlight the outcome of the assumptions taken by each approach, and ultimately, enable a better understanding of transiting exoplanet observations.
I will present the retrieval atmospheric analysis for a sample of exoplanets with published multi-wavelength transit observations from space telescopes. I will discuss the general properties of the sample and, when applicable, compare our results to those of other retrieval studies from the literature. I will also discuss the difficulties that degeneracies in the physical parameters impose in the observed spectra, the consequences that arise from modeling choices made by the researcher, and the expectations for observations from future observatories, like the James Webb Space Telescope.

Seminar room, Institute of Astronomy

Monday 20th August 2018