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Published December 16, 2020 | Published
Book Section - Chapter Open

The ExoGRAVITY project: using single mode interferometry to characterize exoplanets

Lacour, S. ORCID icon
Wang, J. J. ORCID icon
Nowak, Mathias
Pueyo, Laurent A. ORCID icon
Eisenhauer, Frank
Lagrange, A.-M.
Mollière, Paul ORCID icon
Abuter, Roberto
Amorin, António
Asensio-Torres, R. ORCID icon
Baubock, Michi
Benisty, Myriam ORCID icon
Berger, Jean-Philippe ORCID icon
Beust, Hervé
Blunt, S. ORCID icon
Boccaletti, Anthony ORCID icon
Bonnefoy, Mickaël ORCID icon
Bonnet, Henri
Brandner, Wolfgang ORCID icon
Cantalloube, Faustine
Caselli, Paola ORCID icon
Charnay, Benjamin
Chauvin, Gael
Choquet, Élodie ORCID icon
Christiaens, Valentin ORCID icon
Clénet, Yann
Cridland, Alex
de Zeeuw, Tim
Dembet, Roderick
Dexter, Jason ORCID icon
Drescher, Antonia
Duvert, Gilles
Gao, Feng
Garcia-Lopez, Rebeca
Gardner, Tyler
Gendron, Eric
Genzel, Reinhard ORCID icon
Gillessen, Stefan
Girard, Julien H. ORCID icon
Haubois, Xavier
Heissel, Gernot
Henning, Thomas ORCID icon
Hinkley, Sasha ORCID icon
Hippler, Stefan
Horrobin, Matthew
Houlle, Matthis
Hubert, Zoltan
Jimenez Rosales, A
Jocou, Laurent ORCID icon
Kammerer, Jens
Keppler, Miriam
Kervella, Pierre ORCID icon
Kreidberg, Laura ORCID icon
Lapeyrere, Vincent
Le Bouquin, Jean-Baptiste
Léna, Pierre
Lutz, Dieter ORCID icon
Maire, Anne-Lise ORCID icon
Mérand, Antoine
Monnier, John ORCID icon
Mouillet, David
Muller, André
Nasedkin, E. ORCID icon
Ott, Thomas
Otten, Gilles ORCID icon
Paladini, Claudia
Paumard, Thibaut
Rousselet-Perraut, Karine
Perrin, Guy S.
Pfuhl, Oliver
Rameau, Julien ORCID icon
Rodet, Laetitia
Rodriguez-Coira, Gustavo
Rousset, Gerard
Shangguan, Jinyi
Shimizu, Taro ORCID icon
Stadler, Julia
Straub, Odele
Straubmeier, Christian
Sturm, Eckhard
Stolker, Tomas ORCID icon
van Dishoeck, Ewine F. ORCID icon
Vigan, Arthur ORCID icon
Vincent, Frederic
von Fellenberg, Sebastiano
Ward Duong, Kimb ORCID icon
Widmann, Felix
Wieprecht, Ekkehard
Wiezorrek, Erich
Woillez, Julien

Abstract

Combining adaptive optics and interferometric observations results in a considerable contrast gain compared to single-telescope, extreme AO systems. Taking advantage of this, the ExoGRAVITY project is a survey of known young giant exoplanets located in the range of 0.1" to 2" from their stars. The observations provide astrometric data of unprecedented accuracy, being crucial for refining the orbital parameters of planets and illuminating their dynamical histories. Furthermore, GRAVITY will measure non-Keplerian perturbations due to planet-planet interactions in multi-planet systems and measure dynamical masses. Over time, repetitive observations of the exoplanets at medium resolution (R = 500) will provide a catalogue of K-band spectra of unprecedented quality, for a number of exoplanets. The K-band has the unique properties that it contains many molecular signatures (CO, H₂O, CH₄, CO₂). This allows constraining precisely surface gravity, metallicity, and temperature, if used in conjunction with self-consistent models like Exo-REM. Further, we will use the parameter-retrieval algorithm petitRADTRANS to constrain the C/O ratio of the planets. Ultimately, we plan to produce the first C/O survey of exoplanets, kick-starting the difficult process of linking planetary formation with measured atomic abundances.

Additional Information

© 2020 SPIE. This unnumbered section is used to identify those who have aided the authors in understanding or accomplishing the work presented and to acknowledge sources of funding.

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