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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The Evolutionary Track of H/He Envelopes of the Observed Population of Sub-Neptunes and Super-Earths

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Estrela, Raissa [1, 2] ; Swain, Mark R. [1] ; Gupta, Akash [3] ; Sotin, Christophe [1] ; Valio, Adriana [2]
Total Authors: 5
[1] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 - USA
[2] Univ Prebiteriana Mackenzie, Ctr Radioastron & Astrophys Mackenzie, R Consolacao 896, BR-01301000 Sao Paulo, SP - Brazil
[3] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 - USA
Total Affiliations: 3
Document type: Journal article
Source: ASTROPHYSICAL JOURNAL; v. 898, n. 2 AUG 2020.
Web of Science Citations: 0

The observational detection of a localized reduction in the small planet occurrence rate, sometimes termed a ``gap,{''} is an exciting discovery because of the implications for planet evolutionary history. This gap appears to define a transition region in which sub-Neptune planets are believed to have lost their H/He envelopes, potentially by photoevaporation or core powered mass loss, and have thus been transformed into bare core terrestrial planets. Here we investigate the transition between sub-Neptunes and super-Earths using a real sample of observed small close-in planets and applying envelope evolution models of the H/He envelope together with the mass-radius diagram and a photoevaporation model. We find that photoevaporation can explain the H/He envelope loss of most super-Earths in 100 Myr, although an additional loss mechanism appears necessary in some planets. We explore the possibility that these planets' families have different core masses and find a continuum in the primordial population of the strongly irradiated super-Earths and the sub-Neptunes. Our analysis also shows that close-orbiting sub-Neptunes withR R(circle plus)typically lose similar to 30% of their primordial envelope. (AU)

FAPESP's process: 16/25901-9 - Star-planet magnetic interactions and its consequences for planetary habitability
Grantee:Raissa de Lourdes Freitas Estrela
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/09984-7 - Unveiling haze formation and energy balance in the exoplanets atmospheres with the Hubble Space Telescope
Grantee:Raissa de Lourdes Freitas Estrela
Support Opportunities: Scholarships abroad - Research Internship - Doctorate