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ALMA constraints on assembly of core accretion planets

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posted on 2024-03-14, 11:29 authored by Sergei Nayakshin, Vardan Elbakyan, Giovanni Rosotti

Resolved dust continuum and CO line ALMA imaging, and in some cases detection of H α emission, hint that young massive planets are abundant at wide separations in protoplanetary discs. Here we show how these observations can probe the runaway phase of planetary growth in the Core Accretion theory. Planets in this phase have the right range of masses to account for the predominantly moderate contrast gaps and rings seen in ALMA observ ations. Ho we ver, we find that these planets gain mass and migrate inward very rapidly. As a result, the phase when they could produce gaps with properties similar to those observed is very short, i.e. t gap  0.1 Myr, independently of the disc viscosity parameter. This would require many tens to hundreds of gas giant planets to be born per ALMA system, violating the available mass budget of solids in realistic discs. This also predicts preponderance of discs with very wide gaps or complete inner disc holes, which is not observed. We show that suppression of both planet accretion and migration by a factor of at least ten is a possible solution to these serious problems. Future population synthesis models of planet formation should aim to address both exoplanetary data of older disc-less planetary systems and ALMA discs with embedded planets in one framework. 

Funding

Astrophysics Research at the University of Leicester

Science and Technology Facilities Council

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Connecting theories and observations of planet formation

Science and Technology Facilities Council

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Ministry of Science and Higher Education of the Russian Federation under the grant 075-15-2020-780 (N13.1902.21.0039)

History

Author affiliation

College of Science & Engineering/Physics & Astronomy

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

516

Issue

1

Pagination

1250 - 1250

Publisher

OXFORD UNIV PRESS

issn

0035-8711

eissn

1365-2966

Copyright date

2022

Available date

2024-03-14

Language

English

Deposited by

Professor Sergei Nayakshin

Deposit date

2024-03-13

Data Access Statement

The data underlying this article will be shared on reasonable request to the corresponding author.

Rights Retention Statement

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