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Catalogue of exoplanets accessible in reflected starlight to the Nancy Grace Roman Space Telescope. Population study and prospects for phase-curve measurements

Carrión González, Oscar and Garcia Munoz, A. and Santos, N. C. and Cabrera Perez, Juan and Csizmadia, Szilard and Rauer, Heike (2021) Catalogue of exoplanets accessible in reflected starlight to the Nancy Grace Roman Space Telescope. Population study and prospects for phase-curve measurements. Astronomy & Astrophysics, 651, A7. EDP Sciences. doi: 10.1051/0004-6361/202039993. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/abs/2021/07/aa39993-20/aa39993-20.html


Context. Reflected starlight measurements will open a new path in the characterization of directly imaged exoplanets. However, we still lack a population study of known targets to which this technique can be applied. Aims: We investigate which of the about 4300 exoplanets confirmed to date are accessible for the Roman Space Telescope coronagraph in reflected starlight at reference wavelengths lambda = 575, 730, and 825 nm. We carry out a population study and also address the prospects for phase-curve measurements. Methods: We used the NASA Exoplanet Archive as a reference for planet and star properties and explored the effect of their uncertainties on the exoplanet detectability by applying statistical arguments. We defined a planet as Roman-accessible on the basis of the inner and outer working angles of the instrument and its minimum planet-to-star contrast (IWA, OWA, and Cmin). We adopted three plausible configurations for these technical specifications, labeled pessimistic, intermediate, and optimistic. Our key outputs for each exoplanet are its probability of being Roman-accessible (Paccess), the range of observable phase angles, the evolution of its equilibrium temperature, the number of days per orbit for which it is accessible, and its transit probability. Results: In the optimistic scenario, we find 26 Roman-accessible exoplanets with Paccess > 25% and host stars brighter than V = 7 mag. This population is biased towards planets more massive than Jupiter, but also includes the super-Earths tau Cet e and f, which orbit near the habitable zone of their star. Thirteen planets are part of multi-planetary systems. Three of these planets have known transiting companions, which offers opportunities for a contemporaneous atmospheric characterization. The intermediate and pessimistic scenarios yield ten and three Roman-accessible exoplanets, respectively. We find that inclination estimates (e.g. with astrometry) are required to refine the detectability prospects. Conclusions: A science phase of the coronagraph instrument has a remarkable potential for characterizing the atmospheres of exoplanets that cannot be studied with other techniques.

Item URL in elib:https://elib.dlr.de/144611/
Document Type:Article
Title:Catalogue of exoplanets accessible in reflected starlight to the Nancy Grace Roman Space Telescope. Population study and prospects for phase-curve measurements
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
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:A7
Publisher:EDP Sciences
Keywords:catalogs; planets and satellites: detection; planets and satellites: fundamental parameters; planets and satellites: gaseous planets; planets and satellites: terrestrial planets; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics
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:19 Oct 2021 07:17
Last Modified:19 Oct 2021 07:17

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