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Astrophysics Luncheon Seminar

Two Lenses for Glasses: Low- and High-resolution Spectroscopic Observations of Exoplanetary Atmospheres
Presented by Mario Damiano
Jet Propulsion Laboratory, California Institute of Technology

Monday, February 25, 2019
12:00 noon in 169-336

Abstract
Low- and high-resolution spectroscopic observations have provided significant insights on the atmospheric composition of extra solar planets. In this talk I will present two automatic pipelines working in the two resolution contexts.

The first one is an automatic analysis pipeline for HST/WFC3 spatially scanned spectroscopic observations of exoplanet transits and eclipses. The Wide Field Camera 3 records spectra at low-resolution in the near-IR. The pipeline includes all the stages of the analysis from image reduction, to the final 1D spectrum.

The second pipeline analyzes high-resolution spectra using principal component analysis (PCA) combined with a cross-correlation function (CCF). Such a pipeline is able to disentangle the effects of telluric absorption, stellar signal and correlated noise from the planetary signal using the differences of these signals in time and radial velocity.

For years, these techniques have been used separately. However, recently a multi-resolution approach has been used to constrain the thermal structure and the composition of a planetary atmosphere.

JPL Contact: Renyu Hu (4-6090)


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