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Effect of improved atmospheric opacities in modelling Sub-Neptunes: a case study for GJ1214b

MacKenzie, Jasmine and Grenfell, John Lee and Baumeister, Philipp and Tosi, Nicola and Cabrera Perez, Juan and Rauer, H (2022) Effect of improved atmospheric opacities in modelling Sub-Neptunes: a case study for GJ1214b. Astronomy and Astrophysics. EDP Sciences. doi: 10.1051/0004-6361/202141784. ISSN 0004-6361.

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Aims. We investigate the impact of updated atmospheric mean opacity input values upon modeled transit radius and the distribution of interior layer mass fractions. Methods. We have developed and applied a coupled interior-atmosphere model. Our straightforward semi-grey calculation of atmospheric temperature enables us to perform thousands of model realisations in a Monte Carlo approach to address potential degeneracies in interior and atmospheric mass fraction. Our main constraints are planetary mass and radius from which our model infers distributions of the interna! structure of exoplanetary classes ranging from Super-Earth to Mini-Neptune. We vary the relative masses of gas, envelope, mantle and core layers subject to constraints in the bulk density from observations. We investigate the effect of updating atmospheric mean opacities. Results. First, we validate our model output with observed temperature profiles for modern Neptune. We can reproduce the basic features in the middle atmosphere but not the temperature inversion in the upper layers likely because our model lacks aerosol heating. Calculated interiors are generally consistent with modem Neptune. Second, we compare with the well-studied object GJ 1214 b and find that results are broadly consistent with previous work. Results suggest correlations between modelled gas, water, and core mass fractions although these are generally weak. Updating the opacities led to a change on the order of a few percent in the modelled transit radius. This is comparable in magnitude to the planned accuracy of the PLATO data for planetary radius hence the opacity update in the model was important to implement.

Item URL in elib:https://elib.dlr.de/191220/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Effect of improved atmospheric opacities in modelling Sub-Neptunes: a case study for GJ1214b
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
MacKenzie, JasmineTechnische Universität Berlin, Zentrum für Astronomie und Astrophysik, Hardenbergstraße 36, 10623 BerlinUNSPECIFIEDUNSPECIFIED
Baumeister, PhilippUNSPECIFIEDhttps://orcid.org/0000-0001-9284-0143145887585
Tosi, NicolaUNSPECIFIEDhttps://orcid.org/0000-0002-4912-2848UNSPECIFIED
Cabrera Perez, JuanUNSPECIFIEDhttps://orcid.org/0000-0001-6653-5487UNSPECIFIED
Date:25 November 2022
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:EDP Sciences
Keywords:GJ1214b, atmospheres, fundamental parameters, interiors
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 > Planetary Physics
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Grenfell, John Lee
Deposited On:01 Dec 2022 13:55
Last Modified:03 Nov 2023 13:30

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