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Optimally planning and interpreting reflected-starlight observations of exoplanets through a multi-technique approach

Carrión González, Oscar and Garcia Munoz, A. and Santos, N. C. and Cabrera Perez, Juan and Csizmadia, Szilard and Rauer, Heike (2021) Optimally planning and interpreting reflected-starlight observations of exoplanets through a multi-technique approach. STSci: Towards the Comprehensive Characterization of Exoplanets: Science at the Interface of Multiple Measurement Techniques, 19.-23.04.2021, virtuell.

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Abstract

Directly imaging exoplanets in reflected starlight will enable the atmospheric characterization of long-period exoplanets, which are not accessible to current techniques. The launch of the Roman Space Telescope (planned in the mid-2020s) will pave the way for a future generation of telescopes both in space and on the ground (LUVOIR, HabEx, ELTs...) whose ultimate goal is to directly image Earth-like planets in their habitable zones. However, in order to both plan and interpret direct-imaging observations, a multi-technique approach will be needed. For instance, estimating the inclination of the orbit will affect the prospects of detecting the planet. In this talk, we show with particular examples such as Proxima Centauri c how current astrometric measurements of the orbital inclination determine the detectability of exoplanets. We also find that the characterization of atmospheric properties from directly-imaged spectra of exoplanets will be affected by nonatmospheric parameters such as the planet radius. Through atmospheric retrieval exercises we show that, if the planet radius is constrained, it would be possible to constrain the abundance of gaseous species and detect the presence of clouds. On the other hand, if the planet radius remains unknown it will be challenging to distinguish between cloudy and cloud-free atmospheres. This will be the most frequent scenario, given that most long-period planets will not be observed in transit. Hence, we show that the combination of radial velocity and astrometry campaigns will help plan a target list for future direct-imaging telescopes. In addition, to make the most of direct imaging for atmospheric characterization, our retrieval exercises also motivate long-baseline transit missions that enable to measure the planets' radius.

Item URL in elib:https://elib.dlr.de/142432/
Document Type:Conference or Workshop Item (Speech)
Title:Optimally planning and interpreting reflected-starlight observations of exoplanets through a multi-technique approach
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Carrión González, OscarTU BerlinUNSPECIFIED
Garcia Munoz, A.AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, F-91191 Gif-sur-Yvette, Francehttps://orcid.org/0000-0003-1756-4825
Santos, N. C.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal; Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Rua Campo Alegre, 4169-007 Porto, PortugalUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.dehttps://orcid.org/0000-0001-6653-5487
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Rauer, Heikeheike.rauer (at) dlr.dehttps://orcid.org/0000-0002-6510-1828
Date:April 2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:direct imaging exoplanets
Event Title:STSci: Towards the Comprehensive Characterization of Exoplanets: Science at the Interface of Multiple Measurement Techniques
Event Location:virtuell
Event Type:international Conference
Event Dates:19.-23.04.2021
Organizer:STSci
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Cabrera Perez, Juan
Deposited On:31 May 2021 10:03
Last Modified:31 May 2021 10:03

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