3D Global climate model of an exo-Venus: a modern Venus-like atmosphere for the nearby super-Earth LP 890-9 c

Author:

Quirino Diogo12ORCID,Gilli Gabriella13ORCID,Kaltenegger Lisa45ORCID,Navarro Thomas67,Fauchez Thomas J8910,Turbet Martin11,Leconte Jérémy12,Lebonnois Sébastien11,González-Galindo Francisco3

Affiliation:

1. Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa , OAL, Edifício Leste, Tapada da Ajuda, Lisboa PT1349-018, Portugal

2. Faculty of Sciences , University of Lisbon, Campo Grande, Lisboa P-1749-016, Portugal

3. Instituto de Astrofísica de Andalucía (IAA – CSIC) , Glorieta de la Astronomía, Granada E-18008, Spain

4. Department of Astronomy, Cornell University , 311 Space Sciences Building, Ithaca, NY 14853, USA

5. Carl Sagan Institute, Cornell University , 302 Space Sciences Building, Ithaca, NY 14853, USA

6. Trottier Space Institute, McGill University , 3550 University Street, Montréal, QC H3A 2A7, Canada

7. Space Science Institute , 4765 Walnut St, Suite B, Boulder, CO 80301, USA

8. NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA

9. Integrated Space Science and Technology Institute, Department of Physics, American University , Washington DC 20016, USA

10. NASA GSFC Sellers Exoplanet Environments Collaboration , 8800 Greenbelt Road, Greenbelt, MD 20771, USA

11. Laboratoire de Météorologie Dynamique , IPSL, CNRS, Sorbonne Université, ENS, PSL Research University, École Polytechnique, Paris F-75005, France

12. Laboratoire d’Astrophysique de Bordeaux , CNRS, Université de Bordeaux, Bât. B18N, Allée Geoffroy Saint-Hilaire, CS 50023, Pessac F-33615, France

Abstract

ABSTRACT The recently discovered super-Earth LP 890-9 c is an intriguing target for atmospheric studies as it transits a nearby, low-activity late-type M-dwarf star at the inner edge of the Habitable Zone. Its position at the runaway greenhouse limit makes it a natural laboratory to study the climate evolution of hot rocky planets. We present the first 3D-Global Climate Model exo-Venus model for a modern Venus-like atmosphere (92 bar surface pressure, realistic composition, and H2SO4 radiatively-active clouds), applied to the tidally-locked LP 890-9 c to inform observations by JWST and future instruments. If LP 890-9 c has developed into a modern exo-Venus, then the modelled temperatures suggest that H2SO4 clouds are possible even in the substellar region. Like on modern Venus, clouds on LP 890-9 c would create a flat spectrum. The strongest CO2 bands in transmission predicted by our model for LP 890-9 c are about 10 ppm, challenging detection, given JWST estimated noise floor. Estimated phase curve amplitudes are 0.9 and 2.4 ppm for continuum and CO2 bands, respectively. While pointing out the challenge to characterise modern exo-Venus analogues, these results provide new insights for JWST proposals and highlight the influence of clouds in the spectrum of hot rocky exoplanet spectra.

Funder

MCIU

AEI

FEDER

Brinson Foundation

BELSPO

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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