Formation of TRAPPIST-1 and other compact systems

Chris W. Ormel; Beibei Liu; Djoeke Schoonenberg

doi:10.1051/0004-6361/201730826

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Volume 604 (August 2017)

A&A, 604 (2017) A1

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Table 1

Default disk and stellar parameters of TRAPPIST-1 during the planet formation phase.

Symbol	Description	Value	Comments

α	viscosity parameter inner disk	10^-3	^a
δ _ice	fractional width of iceline	0.05
γ _I	prefactor in type-I migration rate	4	^b
ξ	# e-foldings to reach pebble size	10
τ _p	pebble dimensionless stopping time exterior to iceline	0.05	^c
ζ	dust fraction in pebbles	0.5
h	inner disk aspect ratio	0.03
r _out	outer disk radius	200 au
B _⋆	stellar magnetic field strength at surface	180G
M _⋆	stellar mass	0.08M_⊙
M _disk	disk mass (gas)	0.04M_⋆
Ṁ _g	accretion rate	10^-10M_⊙yr^-1
R _⋆	stellar radius	0.5R_⊙
Z ₀	disk metallicity (global solids-to-gas mass ratio)	0.02

Notes.

^(a)

Our default model. We also discuss more laminar and more turbulent disks (10^-4 ≤ α ≤ 10^-2);

^(b)

Kley & Nelson (2012);

^(c)

the stopping time of pebbles interior to the iceline is denoted τ_s with τ_s ≪ τ_p.

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