Late gas released in the young Kuiper belt could have significantly contributed to the carbon enrichment of the atmospheres of Neptune and Uranus

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Table 2

List of the HKB simulations.

HKB ^a	f_accr ^b	$M_{b e l t}^{0} {[M_{\oplus}]}^{c}$ $\[\mathrm{M}_{belt}^{0}~\left[M_{\oplus}\right]^{c}\]$	system ^d	t_ev ^e	t_fold ^f
fid	0.5	50	c	10	10
2	0.1	50	c	10	10
3	0.5	20	c	10	10
4	0.5	5	e	10	10
5	0.5	5	e	100	100

Notes. ^(a)HKB simulations names. ^(b)Accretion efficiency defined in Equation (7). ^(c)Initial belt mass in Earth masses. ^(d)Positions of the planets. In the compact configuration (c in the table), Neptune is initially much closer to the Sun than in the extended configuration (e in the table). The belt is at the same place for all HKB simulations, i.e. closer to the Sun than the present-day Kuiper belt. ^(e)Starting time of the depletion by Neptune’s outer migration in Myr. ^(f)Exponential dissipation of the belt mass over an e-folding time, t_fold (in Myr in the table) starting at t_ev.

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