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Verfasst von:Winter, Andrew J. [VerfasserIn]   i
 Alexander, Richard [VerfasserIn]   i
Titel:An upper limit for the growth of inner planets?
Verf.angabe:Andrew J. Winter and Richard Alexander
E-Jahr:2021
Jahr:2021 May 7
Umfang:20 S.
Fussnoten:Gesehen am 16.08.2021
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
Ort Quelle:Oxford : Oxford Univ. Press, 1827
Jahr Quelle:2021
Band/Heft Quelle:505(2021), 1 vom: Juli, Seite 869-888
ISSN Quelle:1365-2966
Abstract:The exotic range of known planetary systems has provoked an equally exotic range of physical explanations for their diverse architectures. However, constraining formation processes requires mapping the observed exoplanet population to that which initially formed in the protoplanetary disc. Numerous results suggest that (internal or external) dynamical perturbation alters the architectures of some exoplanetary systems. Isolating planets that have evolved without any perturbation can help constrain formation processes. We consider the Kepler multiples, which have low mutual inclinations and are unlikely to have been dynamically perturbed. We apply an adaption of previous modelling efforts, accounting for the two-dimensionality of the radius (Rpl = 0.3–20 R⊕) and period (Porb = 0.5–730 d) distribution. We find that an upper limit in planet mass of the form Mlim ∝ aβpl exp(−ain/apl), for semimajor axis apl and a broad range of ain and β, can reproduce a distribution of Porb, Rpl that is indistinguishable from the observed distribution by our comparison metric. The index is consistent with β = 1.5, expected if growth is limited by accretion within the Hill radius. This model is favoured over models assuming a separable PDF in Porb, Rpl. The limit, extrapolated to longer periods, is coincident with the orbits of RV-discovered planets (apl > 0.2 au, Mpl > 1 MJ) around recently identified low density host stars, hinting at isolation mass limited growth. We discuss the necessary circumstances for a coincidental age-related bias as the origin of this result; such a bias is possible but unlikely. We conclude that, in light of the evidence suggesting that some planetary systems have been dynamically perturbed, simple models for planet growth during the formation stage are worth revisiting.
DOI:doi:10.1093/mnras/stab1302
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 ; Verlag: https://doi.org/10.1093/mnras/stab1302
 Volltext: https://academic.oup.com/mnras/article/505/1/869/6271331
 DOI: https://doi.org/10.1093/mnras/stab1302
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1767077297
Verknüpfungen:→ Zeitschrift

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