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Chromatic line-profile tomography to reveal exoplanetary atmospheres

Francesco Borsa
INAF, MIlan

Abstract
Transmission spectroscopy can constrain the properties of the atmospheres of transiting exoplanets. During a transit, in fact, the light blocked from the atmosphere of the planet leaves an imprint in the light coming from the star. This has been shown for many exoplanets with different techniques.
I will introduce chromatic line-profile tomography as a new method to investigate exoplanetary atmospheres: the signal imprinted on the cross-correlation function by a planet transiting its star is in fact dependent on the planet-to-star radius ratio.
I will show the application of this technique to three HARPS transit observations of HD 189733b. Using separately the different orders of the echelle spectrograph, it is possible to obtain a good-quality broadband transmission spectrum of the planet, that is in agreement with the spectra obtained with other techniques.

15 June 2016, 13:30

Centro de Astrofísica
Rua das Estrelas
4150-762 Porto

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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