Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects

Detalhes bibliográficos
Autor(a) principal: Quirino, Diogo Filipe Gonçalves dos Santos
Data de Publicação: 2022
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/54262
Resumo: Tese de mestrado, Ciências Geofísicas (Meteorologia e Oceanografia) 2022, Universidade de Lisboa, Faculdade de Ciências
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spelling Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospectsTRAPPIST-1 cVénusGCMModelação NuméricaTeses de mestrado - 2022Departamento de Engenharia Geográfica, Geofísica e EnergiaTese de mestrado, Ciências Geofísicas (Meteorologia e Oceanografia) 2022, Universidade de Lisboa, Faculdade de CiênciasIn recent years, several Earth-sized exoplanets have been detected in short-period orbits of a few Earth days, around low-mass stars. Despite their small size compared to gas giants, their close-in orbits, combined with the small radius of the host star compared to our Sun’s, make these worlds the best targets for atmospheric characterisation among rocky exoplanets. These worlds have stellar irradiation levels that can be several times that of the Earth, suggesting that a Venus-like climate is more likely. In this work, I use a Global Circulation Model (GCM), the Generic-GCM, to model a possible Venuslike atmosphere on TRAPPIST-1 c as a benchmark of highly-irradiated rocky exoplanets orbiting Mdwarf stars. The model has been developed at the Laboratoire de Météorologie Dynamique (LMD) for exoplanet and paleoclimate studies. It includes a 3D dynamical core common to all terrestrial planets and a planet-specific physical part. In addition, the Generic-GCM has a generalised radiative transfer routine for variable atmospheric compositions. The overarching goal is twofold: (1) to study the largescale atmospheric circulation of highly-irradiated rocky exoplanets; and (2) to address the observational prospects of this kind of planet by producing phase curves (reflection and emission) and transmission spectra to support future space missions (e.g., James Webb Space Telescope, JWST). I assumed that TRAPPIST-1 c is a synchronous rotator with zero eccentricity and obliquity. It has a Venus-like atmosphere, a 92 bar surface atmospheric pressure, and a radiatively active sulphuric acid prescribed global cloud cover. I run a test to assess the Generic-GCM representation of the large-scale atmospheric circulation on Venus, comparing the results with a Venus specific GCM: the IPSL-VGCM. First, the Generic-GCM reproduces the superrotation pressure range and high-latitudes jets observed in the IPSLVGCM. Second, the Generic-GCM responds well to decreasing insolation by reducing the zonal wind speeds. Third, superrotation is a robust dynamical feature present in the range of insolation explored. The results for TRAPPIST-1 c indicate a warmer atmosphere than that of Venus, possibly a consequence of carbon dioxide absorption of stellar radiation, which is strongest in the near-infrared. The day-night heat redistribution in the planet is done through eastward superrotation jets (equatorial and two high-latitudes) and meridional circulation. The latter comprises two large cells, one per hemisphere (northern and southern), crossing the pole. Heat transport is mainly explained by its mean meridional circulation component, with a minor poleward contribution of the stationary waves in the mid-latitudes. The cloud top temperature field shows a distinctive chevron-like pattern and an eastward shift of the peak thermal emission from the substellar point, suggesting an advection of warm air masses by the equatorial zonal superrotation jet. There is evidence for an equatorial wave (c¯ ∼ 130 m s−1 , Tw = 17.5 hours). The TRAPPIST-1 c reflection phase curves reach a maximum planet-to-star contrast on the order of 10−6 , confirming that high albedo sulphuric acid aerosols of Venus-like cloudy exoplanets may favour their detection by JWST and other future instruments. This work also shows that thermal phase curves can sound different atmospheric levels, depending on the spectral band: carbon dioxide absorption bands will sound mesospheric levels, while continuum bands will sound the cloud top. The simulated transmission spectrum of TRAPPIST-1 c is flattened by clouds, screening almost all but the strongest carbon dioxide absorption bands (e.g., 4.3 µm, 15 µm). Detection of weaker CO2 spectral lines might be possible, suggesting a higher abundance, Venus-like carbon dioxide atmosphere. In particular, the work shows that detecting the 4.8 µm CO2 spectral band might be possible, indicating a high-pressure atmosphere. The removal of Venus-like aerosols from simulations leads to a warmer deep atmosphere, including the development of polar warming. The parametric study reveals that larger exoplanets will have more intense zonal equatorial jets but a smaller eastward shift of the hotspot and larger planet-to-star contrast in the phase curves. The higher-order spin-orbit resonances will modulate the amplitude and peak emission of the thermal phase curve, suggesting that this observable can be used to constrain the rotation state.Machado, Pedro Miguel Borges do Canto Mota, 1967-Gilli, GabriellaRepositório da Universidade de LisboaQuirino, Diogo Filipe Gonçalves dos Santos2022-08-31T14:52:29Z202220222022-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/54262enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T17:00:41Zoai:repositorio.ul.pt:10451/54262Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:05:10.346998Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects
title Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects
spellingShingle Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects
Quirino, Diogo Filipe Gonçalves dos Santos
TRAPPIST-1 c
Vénus
GCM
Modelação Numérica
Teses de mestrado - 2022
Departamento de Engenharia Geográfica, Geofísica e Energia
title_short Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects
title_full Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects
title_fullStr Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects
title_full_unstemmed Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects
title_sort Modelling Venus-like exoplanetary atmospheres with a GCM: planetary parameters impact on the large-scale circulation and observational prospects
author Quirino, Diogo Filipe Gonçalves dos Santos
author_facet Quirino, Diogo Filipe Gonçalves dos Santos
author_role author
dc.contributor.none.fl_str_mv Machado, Pedro Miguel Borges do Canto Mota, 1967-
Gilli, Gabriella
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Quirino, Diogo Filipe Gonçalves dos Santos
dc.subject.por.fl_str_mv TRAPPIST-1 c
Vénus
GCM
Modelação Numérica
Teses de mestrado - 2022
Departamento de Engenharia Geográfica, Geofísica e Energia
topic TRAPPIST-1 c
Vénus
GCM
Modelação Numérica
Teses de mestrado - 2022
Departamento de Engenharia Geográfica, Geofísica e Energia
description Tese de mestrado, Ciências Geofísicas (Meteorologia e Oceanografia) 2022, Universidade de Lisboa, Faculdade de Ciências
publishDate 2022
dc.date.none.fl_str_mv 2022-08-31T14:52:29Z
2022
2022
2022-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/54262
url http://hdl.handle.net/10451/54262
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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