2014A&A...572A..35L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST06:59:12

2014A&A...572A..35L - Astronomy and Astrophysics, volume 572A, 35-35 (2014/12-1)

Separating gas-giant and ice-giant planets by halting pebble accretion.

LAMBRECHTS M., JOHANSEN A. and MORBIDELLI A.

Abstract (from CDS):

In the solar system giant planets come in two flavours: gas giants (Jupiter and Saturn) with massive gas envelopes, and ice giants (Uranus and Neptune) with much thinner envelopes around their cores. It is poorly understood how these two classes of planets formed. High solid accretion rates, necessary to form the cores of giant planets within the life-time of protoplanetary discs, heat the envelope and prevent rapid gas contraction onto the core, unless accretion is halted. We find that, in fact, accretion of pebbles (∼cm sized particles) is self-limiting: when a core becomes massive enough it carves a gap in the pebble disc. This halt in pebble accretion subsequently triggers the rapid collapse of the super-critical gas envelope. Unlike gas giants, ice giants do not reach this threshold mass and can only bind low-mass envelopes that are highly enriched by water vapour from sublimated icy pebbles. This offers an explanation for the compositional difference between gas giants and ice giants in the solar system. Furthermore, unlike planetesimal-driven accretion scenarios, our model allows core formation and envelope attraction within disc life-times, provided that solids in protoplanetary discs are predominantly made up of pebbles. Our results imply that the outer regions of planetary systems, where the mass required to halt pebble accretion is large, are dominated by ice giants and that gas-giant exoplanets in wide orbits are enriched by more than 50 Earth masses of solids.

Abstract Copyright:

Journal keyword(s): planets and satellites: formation - planets and satellites: gaseous planets - planets and satellites: composition - planets and satellites: interiors - protoplanetary disks

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 CoRoT-20b Pl 06 30 52.9022405280 +00 13 36.858471822           ~ 26 1
2 CoRoT-13b Pl 06 50 53.0726687117 -05 05 11.190142526           ~ 29 1
3 CoRoT-14b Pl 06 53 41.8086658726 -05 32 09.682886897           ~ 31 1
4 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1532 1
5 CoRoT-17b Pl 18 34 47.8213622401 -06 36 44.111908316           ~ 21 1
6 CoRoT-23b Pl 18 39 07.8405532613 +04 21 28.034647444           ~ 16 1
7 CoRoT-10b Pl 19 24 15.2868183023 +00 44 46.003932819           ~ 45 1
8 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 896 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-06:59:12

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