The ExoGRAVITY project: Using single mode interferometry to characterize exoplanets

Exoplanets; Optical interferometry; Planet formation; Adaptive optics; Extrasolar planets; Gravitation; Interferometry; Surveys; Metallicities; Molecular signatures; Orbital parameters; Parameter retrieval; Planetary formation; Self-consistent model; Single mode; Surface gravity; Orbits

Abstract :

[en] 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. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Lacour, S.; LESIA, Observatoire de Paris, PSL, CNRS, Sorbonne Universite, Meudon, 92195, France, European Southern Observatory, Karl-Schwarzschild-Straße 2, Garching, 85748, Germany

Wang, J. J.; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, United States

Nowak, M.; Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, United Kingdom

Pueyo, L.; Space Telescope Science Institute, Baltimore, MD 21218, United States

Eisenhauer, F.; Max Planck Institute for Extraterrestrial Physics, Garching, 85748, Germany

Lagrange, A.-M.; LESIA, Observatoire de Paris, PSL, CNRS, Sorbonne Universite, Meudon, 92195, France, Universite Grenoble Alpes, CNRS, IPAG, Grenoble, 38000, France

Mollière, P.; Max Planck Institute for Astronomy, Konigstuhl 17, Heidelberg, 69117, Germany

Abuter, R.; European Southern Observatory, Karl-Schwarzschild-Straße 2, Garching, 85748, Germany

Amorin, A.; Universidade de Lisboa, Faculdade de Ciencias, Campo Grande, Lisboa, 1749-016, Portugal, CENTRA, Centro de Astrofisica e Gravitacao, Universidade de Lisboa, Lisboa, Portugal

Asensio-Torres, R.; Max Planck Institute for Astronomy, Konigstuhl 17, Heidelberg, 69117, Germany

More authors (85 more)

Language :

English

Title :

The ExoGRAVITY project: Using single mode interferometry to characterize exoplanets

Publication date :

2020

Event name :

Optical and Infrared Interferometry and Imaging VII 2020

Event date :

14 December 2020 through 22 December 2020

Audience :

International

Journal title :

Proceedings of SPIE: The International Society for Optical Engineering

ISSN :

0277-786X

eISSN :

1996-756X

Publisher :

International Society for Optical Engineering, Bellingham, United States - Washington

Volume :

11446

Peer reviewed :

Peer reviewed

Funders :

The Society of Photo-Optical Instrumentation Engineers (SPIE)

Commentary :

166331 9781510636798

Available on ORBi :

since 05 February 2022

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