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Direct-imaging of cold exoplanets: The importance of knowing the planet radius

Carrión González, Oscar and Garcia Munoz, A. and Cabrera Perez, Juan and Csizmadia, Szilard and Santos, N. C. and Rauer, H (2020) Direct-imaging of cold exoplanets: The importance of knowing the planet radius. Virtual Annual Meeting of the German Astronomical Society, 21.-25. Sep. 2020, Online.

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Direct imaging of exoplanets in reflected starlight will be a major step forward in atmospheric characterization. Nancy Grace Roman Space Telescope (former WFIRST) or concepts such as LUVOIR or HabEx will directly observe the starlight reflected from cold and temperate exoplanets. This will probe atmospheric depths that are not accessible in transit measurements. Direct-imaging technique will also allow us to study the atmospheres of non-transiting exoplanets. Here we present results from a recent work (1) where we aim to understand what information can be extracted from such direct imaging observations. We simulated direct-imaging measurements and performed retrievals to constrain the atmospheric properties of the exoplanet. We find that knowing the planet radius will be key to improve the atmospheric characterization. This will affect the predictions about the science outcome of direct-imaging missions, because most of the exoplanets accessible to direct imaging will lack a measurement of the radius. We apply our study to Barnard's Star b and discuss the prospects for characterizing the atmosphere of this nearby (d=1.8pc) super-Earth. (1) https://doi.org/10.1051/0004-6361/202038101

Item URL in elib:https://elib.dlr.de/137424/
Document Type:Conference or Workshop Item (Speech)
Title:Direct-imaging of cold exoplanets: The importance of knowing the planet radius
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Garcia Munoz, A.Zentrum fuer Astronomie und Astrophysik, Technische Universitaet Berlin, Germanyhttps://orcid.org/0000-0003-1756-4825UNSPECIFIED
Cabrera Perez, JuanUNSPECIFIEDhttps://orcid.org/0000-0001-6653-5487UNSPECIFIED
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, PortugalUNSPECIFIEDUNSPECIFIED
Date:September 2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:exoplanets, direct imaging
Event Title:Virtual Annual Meeting of the German Astronomical Society
Event Location:Online
Event Type:national Conference
Event Dates:21.-25. Sep. 2020
Organizer:Astronomische Gesellschaft
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 (old)
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:12 Nov 2020 08:57
Last Modified:12 Nov 2020 08:57

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