The growth of planets by pebble accretion in evolving protoplanetary discs
(2015) In Astronomy & Astrophysics 582.- Abstract
- The formation of planets depends on the underlying protoplanetary disc structure, which in turn influences both the accretion and migration rates of embedded planets. The disc itself evolves on time scales of several Myr, during which both temperature and density profiles change as matter accretes onto the central star. Here we used a detailed model of an evolving disc to determine the growth of planets by pebble accretion and their migration through the disc. Cores that reach their pebble isolation mass accrete gas to finally form giant planets with extensive gas envelopes, while planets that do not reach pebble isolation mass are stranded as ice giants and ice planets containing only minor amounts of gas in their envelopes. Unlike... (More)
- The formation of planets depends on the underlying protoplanetary disc structure, which in turn influences both the accretion and migration rates of embedded planets. The disc itself evolves on time scales of several Myr, during which both temperature and density profiles change as matter accretes onto the central star. Here we used a detailed model of an evolving disc to determine the growth of planets by pebble accretion and their migration through the disc. Cores that reach their pebble isolation mass accrete gas to finally form giant planets with extensive gas envelopes, while planets that do not reach pebble isolation mass are stranded as ice giants and ice planets containing only minor amounts of gas in their envelopes. Unlike earlier population synthesis models, our model works without any artificial reductions in migration speed and for protoplanetary discs with gas and dust column densities similar to those inferred from observations. We find that in our nominal disc model, the emergence of planetary embryos preferably should occur after approximately 2 Myr in order to not exclusively form gas giants, but also ice giants and smaller planets. The high pebble accretion rates ensure that critical core masses for gas accretion can be reached at all orbital distances. Gas giant planets nevertheless experience significant reduction in semi-major axes by migration. Considering instead planetesimal accretion for planetary growth, we show that formation time scales are too long to compete with the migration time scales and the dissipation time of the protoplanetary disc. All in all, we find that pebble accretion overcomes many of the challenges in the formation of ice and gas giants in evolving protoplanetary discs. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8383377
- author
- Bitsch, Bertram LU ; Lambrechts, Michiel LU and Johansen, Anders LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- planets and satellites: formation, planet-disk interactions, protoplanetary disks, accretion disks, accretion
- in
- Astronomy & Astrophysics
- volume
- 582
- article number
- A112
- publisher
- EDP Sciences
- external identifiers
-
- wos:000363538500112
- scopus:84946113302
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/201526463
- language
- English
- LU publication?
- yes
- id
- 47ed92a5-03ae-4f7b-8ed9-d75f7951a646 (old id 8383377)
- date added to LUP
- 2016-04-01 14:53:58
- date last changed
- 2022-12-12 02:09:54
@article{47ed92a5-03ae-4f7b-8ed9-d75f7951a646,
abstract = {{The formation of planets depends on the underlying protoplanetary disc structure, which in turn influences both the accretion and migration rates of embedded planets. The disc itself evolves on time scales of several Myr, during which both temperature and density profiles change as matter accretes onto the central star. Here we used a detailed model of an evolving disc to determine the growth of planets by pebble accretion and their migration through the disc. Cores that reach their pebble isolation mass accrete gas to finally form giant planets with extensive gas envelopes, while planets that do not reach pebble isolation mass are stranded as ice giants and ice planets containing only minor amounts of gas in their envelopes. Unlike earlier population synthesis models, our model works without any artificial reductions in migration speed and for protoplanetary discs with gas and dust column densities similar to those inferred from observations. We find that in our nominal disc model, the emergence of planetary embryos preferably should occur after approximately 2 Myr in order to not exclusively form gas giants, but also ice giants and smaller planets. The high pebble accretion rates ensure that critical core masses for gas accretion can be reached at all orbital distances. Gas giant planets nevertheless experience significant reduction in semi-major axes by migration. Considering instead planetesimal accretion for planetary growth, we show that formation time scales are too long to compete with the migration time scales and the dissipation time of the protoplanetary disc. All in all, we find that pebble accretion overcomes many of the challenges in the formation of ice and gas giants in evolving protoplanetary discs.}},
author = {{Bitsch, Bertram and Lambrechts, Michiel and Johansen, Anders}},
issn = {{0004-6361}},
keywords = {{planets and satellites: formation; planet-disk interactions; protoplanetary disks; accretion disks; accretion}},
language = {{eng}},
publisher = {{EDP Sciences}},
series = {{Astronomy & Astrophysics}},
title = {{The growth of planets by pebble accretion in evolving protoplanetary discs}},
url = {{http://dx.doi.org/10.1051/0004-6361/201526463}},
doi = {{10.1051/0004-6361/201526463}},
volume = {{582}},
year = {{2015}},
}