Linking the evolution of terrestrial interiors and an early outgassed atmosphere to astrophysical observations

Bower, Dan J.; Kitzmann, Daniel; Wolf, Aaron S.; Sanan, Patrick; Dorn, Caroline; Oza, Apurva V. (2019). Linking the evolution of terrestrial interiors and an early outgassed atmosphere to astrophysical observations. Astronomy and astrophysics, 631(A103), A103. EDP Sciences 10.1051/0004-6361/201935710

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A terrestrial planet is molten during formation and may remain so if subject to intense insolation or tidal forces. Observations continue to favour the detection and characterisation of hot planets, potentially with large outgassed atmospheres. We aim to determine the radius of hot Earth-like planets with large outgassed atmospheres and explore differences between molten and solid silicate planets and their influence on the mass-radius relationship and transmission and emission spectra. An interior-atmosphere model, combined with static structure calculations, tracks the evolving radius of a rocky mantle that is outgassing CO₂ and H₂O. Synthetic emission and transmission spectra are generated for CO₂ and H₂O dominated atmospheres. Atmospheres dominated by CO₂ suppress the outgassing of H₂O to a greater extent than previously realised, as previous studies have applied an erroneous relationship between volatile mass and partial pressure. We therefore predict more H₂O can be retained by the interior during the later stages of magma ocean crystallisation. Furthermore, formation of a lid at the surface can tie outgassing of H₂O to the efficiency of heat transport through the lid, rather than the atmosphere's radiative timescale. Contraction of the mantle as it solidifies gives ∼5% radius decrease, which can partly be offset by addition of a relatively light species to the atmosphere. We conclude that a molten silicate mantle can increase the radius of a terrestrial planet by around 5% compared to its solid counterpart, or equivalently account for a 13% decrease in bulk density. An outgassing atmosphere can perturb the total radius according to its speciation. Atmospheres of terrestrial planets around M-stars that are dominated by CO₂ or H₂O can be distinguished by observing facilities with extended wavelength coverage (e.g., JWST).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
10 Strategic Research Centers > Center for Space and Habitability (CSH)
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Bower, Dan J.; Kitzmann, Daniel and Oza, Apurva Vikram

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Danielle Zemp

Date Deposited:

03 Apr 2020 12:08

Last Modified:

05 Apr 2020 02:50

Publisher DOI:

10.1051/0004-6361/201935710

ArXiv ID:

1904.08300v3

BORIS DOI:

10.7892/boris.142634

URI:

https://boris.unibe.ch/id/eprint/142634

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