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Dawes Review 7: The Tidal Downsizing Hypothesis of Planet Formation

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journal contribution
posted on 23.11.2017, 12:23 by Sergei Nayakshin
Tidal Downsizing scenario of planet formation builds on ideas proposed by Gerard Kuiper in 1951. Detailed simulations of self-gravitating discs, gas fragments, dust grain dynamics, and planet evolutionary calculations are summarised here and used to build a predictive population synthesis. A new interpretation of exoplanetary and debris disc data, the Solar System's origins, and the links between planets and brown dwarfs is offered. Tidal Downsizing predicts that presence of debris discs, sub-Neptune mass planets, planets more massive than ~ 5 Jupiter masses and brown dwarfs should not correlate strongly with the metallicity of the host. For gas giants of ~ Saturn to a few Jupiter mass, a strong host star metallicity correlation is predicted only inwards of a few AU from the host. Composition of massive cores is predicted to be dominated by rock rather than ices. Debris discs made by Tidal Downsizing have an innermost edge larger than about 1 au, have smaller total masses and are usually in a dynamically excited state. Planet formation in surprisingly young or very dynamic systems such as HL Tau and Kepler-444 may be a signature of Tidal Downsizing. Open questions and potential weaknesses of the hypothesis are pointed out.

History

Citation

Publications of the Astronomical Society of Australia, 2017, 34, (e002), pp. ?-? (46)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

Publications of the Astronomical Society of Australia

Publisher

Cambridge University Press for Astronomical Society of Australia

issn

1323-3580

eissn

1448-6083

Acceptance date

04/11/2016

Copyright date

2017

Available date

23/11/2017

Publisher version

https://www.cambridge.org/core/journals/publications-of-the-astronomical-society-of-australia/article/dawes-review-7-the-tidal-downsizing-hypothesis-of-planet-formation/55CB4E8D0BBF6C53AFC36688CC1A1D63

Language

en