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Verfasst von:Mai, Chuhong [VerfasserIn]   i
 Desch, Steven J. [VerfasserIn]   i
 Kuiper, Rolf [VerfasserIn]   i
 Marleau, Gabriel-Dominique [VerfasserIn]   i
 Dullemond, Cornelis [VerfasserIn]   i
Titel:The dynamic proto-atmospheres around low-mass planets with eccentric orbits
Verf.angabe:Chuhong Mai, Steven J. Desch, Rolf Kuiper, Gabriel-Dominique Marleau, and Cornelis Dullemond
E-Jahr:2020
Jahr:2020 August 10
Umfang:18 S.
Illustrationen:Illustrationen
Fussnoten:Gesehen am 25.09.2020
Titel Quelle:Enthalten in: The astrophysical journal / 1
Ort Quelle:London : Institute of Physics Publ., 1996
Jahr Quelle:2020
Band/Heft Quelle:899(2020,1) Artikel-Nummer 54, 18 Seiten
ISSN Quelle:1538-4357
Abstract:Protoplanets are able to accrete primordial atmospheres when embedded in the gaseous protoplanetary disk. The formation and structure of the proto-atmosphere are subject to the planet-disk environment and orbital effects. In particular, when planets are on eccentric orbits, their velocities relative to the gas can exceed the sound speed. The planets generate atmosphere-stripping bow shocks. We investigate the proto-atmospheres on low-mass planets with eccentric orbits with radiation-hydrodynamics simulations. A 2D radiative model of the proto-atmosphere is established with tabulated opacities for the gas and dust. The solutions reveal large-scale gas recycling inside a bow shock structure. The atmospheres on eccentric planets are typically three to four orders of magnitude less massive than those on planets with circular orbits. Overall, however, a supersonic environment is favorable for planets to keep an early stable atmosphere, rather than harmful, due to the steady gas supply through the recycling flow. We also quantitatively explore how such atmospheres are affected by the planet’s velocity relative to the gas, the planet mass, and the background gas density. Our time-dependent simulations track the orbital evolution of the proto-atmosphere with the planet-disk parameters changing throughout the orbit. Atmospheric properties show oscillatory patterns as the planet travels on an eccentric orbit, with a lag in phase. To sum up, low-mass eccentric planets can retain small proto-atmospheres despite the stripping effects of bow shocks. The atmospheres are always connected to and interacting with the disk gas. These findings provide important insights into the impacts of migration and scattering on planetary proto-atmospheres.
DOI:doi:10.3847/1538-4357/aba4a8
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.3847/1538-4357/aba4a8
 DOI: https://doi.org/10.3847/1538-4357/aba4a8
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1733743219
Verknüpfungen:→ Zeitschrift

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