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25 mai 2018 Tout le mois


Jayne Birkby (University of Amsterdam) - New Frontiers in Exoplanet Characterization

Vendredi 25 mai 11:00-12:00

Exoplanet characterization is undergoing a rapid evolution, especially in the study of exoplanet atmospheres. I will discuss the very latest results from both space and ground-based observations and highlight how they are helping us to understand exoplanet origins and diversity. I will focus part of my talk on high-resolution spectroscopy, which is a robust and powerful tool in exoplanet characterization. It uses changes in the Doppler shift of a planet to disentangle its spectrum from the glare of its host star. The technique is sensitive to the depth, shape, and position of a planet’s spectral lines, and thus reveals information about the planet’s composition, atmospheric structure, mass, global wind patterns, and rotation. I will present some exciting preliminary results from MEASURE : the MMT Exoplanet Atmosphere SURvEy. This 40 night survey is the largest high-resolution study of exoplanet atmospheres to date, containing day and night side spectra of transiting and non-transiting hot Jupiters and Saturns. Its goal is to provide a homogenous dataset to perform comparative exoplanetology, and provide complementary high-resolution spectra for exoplanets observed with HST and Spitzer. The combination of high and low-resolution spectroscopy can provide stringent constraints on planet metallicity and C/O ratios, and signifies the next step in the detailed characterization of exoplanet atmospheres. I will also discuss how the study of exoplanet atmospheres in reflected light, and over time, can help reveal their formation pathways and evolutionary history.

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