2019A&A...631A...7C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST08:11:32

2019A&A...631A...7C - Astronomy and Astrophysics, volume 631A, 7-7 (2019/11-1)

Pebbles versus planetesimals: the case of Trappist-1.

COLEMAN G.A.L., LELEU A., ALIBERT Y. and BENZ W.

Abstract (from CDS):

We present a study into the formation of planetary systems around low mass stars similar to Trappist-1, through the accretion of either planetesimals or pebbles. The aim is to determine if the currently observed systems around low mass stars could favour one scenario over the other. To determine these differences, we ran numerous N-body simulations, coupled to a thermally evolving viscous 1D disc model, and including prescriptions for planet migration, photoevaporation, and pebble and planetesimal dynamics. We mainly examine the differences between the pebble and planetesimal accretion scenarios, but we also look at the influences of disc mass, size of planetesimals, and the percentage of solids locked up within pebbles. When comparing the resulting planetary systems to Trappist-1, we find that a wide range of initial conditions for both the pebble and planetesimal accretion scenarios can form planetary systems similar to Trappist-1, in terms of planet mass, periods, and resonant configurations. Typically these planets formed exterior to the water iceline and migrated in resonant convoys into the inner region close to the central star. When comparing the planetary systems formed through pebble accretion to those formed through planetesimal accretion, we find a large number of similarities, including average planet masses, eccentricities, inclinations, and period ratios. One major difference between the two scenarios was that of the water content of the planets. When including the effects of ablation and full recycling of the planets' envelope with the disc, the planets formed through pebble accretion were extremely dry, whilst those formed through planetesimal accretion were extremely wet. If the water content is not fully recycled and instead falls to the planets' core, or if ablation of the water is neglected, then the planets formed through pebble accretion are extremely wet, similar to those formed through planetesimal accretion. Should the water content of the Trappist-1 planets be determined accurately, this could point to a preferred formation pathway for planetary systems, or to specific physics that may be at play.

Abstract Copyright: © ESO 2019

Journal keyword(s): planetary systems - planets and satellites: formation - planets and satellites: dynamical evolution and stability - planet-disk interactions

Simbad objects: 13

goto Full paper

goto View the reference in ADS

Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 G 268-38 PM* 00 44 59.3314993038 -15 16 17.543124886     14.150 13.801   M4.5 88 0
2 V* YZ Cet Er* 01 12 30.6367741360 -16 59 56.361313690 15.315 13.885 12.074 10.696 8.938 M4.0Ve 212 0
3 LP 656-38 PM* 05 01 57.4261049715 -06 56 46.371875101   13.92 12.196 11.791 9.175 M4.0Ve 98 0
4 L 320-124 PM* 10 14 51.7783473599 -47 09 24.189733387       13.067   M4 77 0
5 Ross 128 Er* 11 47 44.3968668170 +00 48 16.404931305 14.223 12.905 11.153 9.859 8.184 dM4 353 0
6 NAME Proxima Centauri b Pl 14 29 42.9451234609 -62 40 46.170818907           ~ 247 0
7 NAME Proxima Centauri Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1028 0
8 G 139-21 PM* 17 15 18.9337265994 +04 57 50.064695682       14.394   M4.5V 255 1
9 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 686 2
10 TRAPPIST-1c Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 112 0
11 TRAPPIST-1d Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 132 0
12 TRAPPIST-1g Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 120 0
13 TRAPPIST-1 LM* 23 06 29.3684052886 -05 02 29.031690445     18.798 16.466 14.024 M7.5e 581 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2019A&A...631A...7C and select 'bookmark this link' or equivalent in the popup menu


2021.04.15-08:11:32

© Université de Strasbourg/CNRS

    • Contact