The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) - II. The radial structure of debris discs

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Volume 705 (January 2026)

A&A, 705 (2026) A196

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Table C.3

MCMC results from the best parametric models for HD 15115, HD 107146, and HD 197481.

	HD 15115		HD 107146		HD 197481
	2 pow. + 1 gap		3 pow. + 2 gaps		3 pow. + 1 gap		3 pow.
Parameter	Best fit	Median	Best fit	Median	Best fit	Median	Best fit	Median
R_c (au)	98.11	${98.09}_{- 0.19}^{+ 0.16}$ $98.09_{-0.19}^{+0.16}$
R_in (au)			44.4	${43.8}_{- 0.9}^{+ 0.8}$ $43.8_{-0.9}^{+0.8}$	25.4	${25.1}_{- 1.0}^{+ 0.8}$ $25.1_{-1.0}^{+0.8}$	26.7	${26.9}_{- 0.7}^{+ 0.5}$ $26.9_{-0.7}^{+0.5}$
R_out (au)			137.8	${137.5}_{- 1.0}^{+ 1.0}$ $137.5_{-1.0}^{+1.0}$	38.7	${38.1}_{- 1.4}^{+ 1.2}$ $38.1_{-1.4}^{+1.2}$	38.3	${39.0}_{- 1.3}^{+ 1.1}$ $39.0_{-1.3}^{+1.1}$
α_in	7.9	${7.9}_{- 0.2}^{+ 0.3}$ $7.9_{-0.2}^{+0.3}$	6.7	${6.6}_{- 0.3}^{+ 0.4}$ $6.6_{-0.3}^{+0.4}$	25	$28_{- 11}^{+ 14}$ $28_{-11}^{+14}$	28	$25_{- 5}^{+ 4}$ $25_{-5}^{+4}$
α_mid			0	${0.02}_{- 0.05}^{+ 0.04}$ $0.02_{-0.05}^{+0.04}$	0.9	${0.8}_{- 0.4}^{+ 0.3}$ $0.8_{-0.4}^{+0.3}$	0.8	${0.5}_{- 0.3}^{+ 0.4}$ $0.5_{-0.3}^{+0.4}$
α_out	−16.2	$- {16.3}_{- 0.8}^{+ 0.6}$ $-16.3_{-0.8}^{+0.6}$	−11.3	$- {11.4}_{- 0.5}^{+ 0.6}$ $-11.4_{-0.5}^{+0.6}$	−9.3	$- {9.5}_{- 2.0}^{+ 1.5}$ $-9.5_{-2.0}^{+1.5}$	−11.1	$- {11.4}_{- 2.1}^{+ 1.4}$ $-11.4_{-2.1}^{+1.4}$
R₁ (au)	94	${93.9}_{- 0.3}^{+ 0.3}$ $93.9_{-0.3}^{+0.3}$	55.9	${56.1}_{- 0.3}^{+ 0.5}$ $56.1_{-0.3}^{0.5}$	36	$34_{- 2}^{+ 3}$ $34_{-2}^{+3}$
σ₁ (au)	11	${10.9}_{- 0.4}^{+ 0.4}$ $10.9_{-0.4}^{+0.4}$	2.7	${2.9}_{- 0.4}^{+ 0.6}$ $2.9_{-0.4}^{+0.6}$	7.5	$8_{- 1.1}^{+ 1.2}$ $8_{-1.1}^{+1.2}$
C₁	0.448	${0.452}_{- 0.008}^{+ 0.007}$ $0.452_{-0.008}^{+0.007}$	0.64	${0.57}_{- 0.9}^{+ 0.7}$ $0.57_{-0.9}^{+0.7}$	0.8	${0.6}_{- 0.3}^{+ 0.3}$ $0.6_{-0.3}^{+0.3}$
R₂ (au)			77.9	${78.1}_{- 0.8}^{+ 0.6}$ $78.1_{-0.8}^{+0.6}$
σ₂ (au)			16.2	${16.6}_{- 0.8}^{+ 1.0}$ $16.6_{-0.8}^{+1.0}$
C₂			0.692	${0.693}_{- 0.016}^{+ 0.025}$ $0.693_{-0.016}^{+0.025}$
Σ_c	−3.04	$- {3.02}_{- 0.02}^{+ 0.02}$ $-3.02_{-0.02}^{+0.02}$	−4.17	$- {4.18}_{- 0.04}^{+ 0.04}$ $-4.18_{-0.04}^{+0.04}$	−3.82	$- {3.89}_{- 0.10}^{+ 0.11}$ $-3.89_{-0.10}^{+0.11}$	−4.05	$- {3.99}_{- 0.08}^{+ 0.06}$ $-3.99_{-0.08}^{+0.06}$
PA (°)	98.478	${98.464}_{- 0.033}^{+ 0.019}$ $98.464_{-0.033}^{+0.019}$	163.2	${163.29}_{- 0.16}^{+ 0.19}$ $163.29_{-0.16}^{+0.19}$	128.72	${128.73}_{- 0.02}^{+ 0.03}$ $128.73_{-0.02}^{+0.03}$	128.72	${128.74}_{- 0.03}^{+ 0.05}$ $128.74_{-0.03}^{+0.05}$
Δ α (mas)	36	$36_{- 2}^{+ 3}$ $36_{-2}^{+3}$	12	$11_{- 6}^{+ 7}$ $11_{-6}^{+7}$	−19	$- 20_{- 7}^{+ 6}$ $-20_{-7}^{+6}$	−17	$- 22_{- 7}^{+ 7}$ $-22_{-7}^{+7}$
Δ δ (mas)	−14.0	$- {14.0}_{- 0.09}^{+ 0.09}$ $-14.0_{-0.09}^{+0.09}$	−20	$- 29_{- 5}^{+ 5}$ $-29_{-5}^{+5}$	−9	$- 9_{- 6}^{+ 5}$ $-9_{-6}^{+5}$	−10	$- 8_{- 6}^{+ 5}$ $-8_{-6}^{+5}$
i (°)	86.753	${86.735}_{- 0.041}^{+ 0.017}$ $86.735_{-0.041}^{+0.017}$	14.5	${14.4}_{- 0.3}^{+ 1.1}$ $14.4_{-0.3}^{+1.1}$	88.4	${88.42}_{- 0.06}^{+ 0.03}$ $88.42_{-0.06}^{+0.03}$	88.41	${88.40}_{- 0.08}^{+ 0.04}$ $88.40_{-0.08}^{+0.04}$
F_* (μ Jy)	21	$25_{- 6}^{+ 6}$ $25_{-6}^{+6}$	23.1	${23.6}_{- 1.3}^{+ 1.7}$ $23.6_{-1.3}^{+1.7}$	See Table C.4

Notes. The surface density normalisation Σ_c is parametrised as an exponent, with 10^Σ_c in units of g cm⁻². For HD 197481, the significance of the gap centred at 36 au is ambiguous, so we report results for two parametrisations here.

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