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ALMA observations require slower Core Accretion runaway growth

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journal contribution
posted on 16.09.2019, 11:30 by S Nayakshin, G Dipierro, J Szulágyi
Due to recent high-resolution ALMA observations, there is an accumulating evidence for presence of giant planets with masses from ∼0.01 MJ to a few MJ with separations up to 100 au in the annular structures observed in young protoplanetary discs. We point out that these observations set unique ‘live’ constraints on the process of gas accretion on to subJovian planets that were not previously available. Accordingly, we use a population synthesis approach in a new way: we build time-resolved models and compare the properties of the synthetic planets with the ALMA data at the same age. Applying the widely used gas accretion formulae leads to a deficit of sub-Jovian planets and an overabundance of a few Jupiter mass planets compared to observations. We find that gas accretion rate on to planets needs to be suppressed by about an order of magnitude to match the observed planet mass function. This slower gas giant growth predicts that the planet mass should correlate positively with the age of the protoplanetary disc, albeit with a large scatter. This effect is not clearly present in the ALMA data but may be confirmed in the near future with more observations.

Funding

SN acknowledges support from STFC grants ST/N000757/1 and ST/M006948/1 to the University of Leicester. GD acknowledges financial support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 681601). JS acknowledges the funding from the Swiss National Science Foundation (SNSF) Ambizione grant PZ00P2_174115.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2019, 488 (1), pp. L12-L17 (6)

Author affiliation

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

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP), Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Acceptance date

29/05/2019

Copyright date

2019

Available date

16/09/2019

Publisher version

https://academic.oup.com/mnrasl/article/488/1/L12/5512600

Notes

Supplementary data are available at MNRASL online. https://academic.oup.com/mnrasl/article/488/1/L12/5512600#supplementary-data slz087_Supplement_Table Table 1. A part of the data used in this paper. - zip file

Language

en