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.2

MCMC results for discs with gaps or extended emission fit by a double Gaussian.

Best Fits
Disc	R₁ (au)	R₂ (au)	σ₁ (au)	σ₂ (au)	C	Σ_c	PA (°)	Δ α (mas)	Δ δ (mas)	i (°)	F_* (μ Jy)
HD 10647	89.2	168	12	48	0.659	−4.433	56.93	121	−17	79.08	128
HD 15115	65.8	97.54	1.6	4.75	0.26	−3.40	98.466	37	−14	86.7	23
HD 61005	69.7	94	7.3	32.3	0.836	−3.358	70.29	2	−16	86.2	1
HD 92945	57.1	102.7	5.6	24.1	0.52	−4.09	100.9	−70	−87	66.3	39
HD 109573	77.65	85	2.98	24	0.979	−2.77	26.52	13.8	−39.9	76.54	52
HD 121617	75.2	100	6	42	0.948	−3.17	58.0	0	−2	43.9	5
HD 131488	90.8	95.1	0.69	17.3	0.97	−1.96	97.305	1.1	−7.3	84.84	40
HD 131835	68.7	104.2	4.9	44.7	0.866	−2.9	58.94	1.4	−5.9	74.47	4
HD 206893	42	125	6	36	0.43	−4.53	64	−50	20	44	17

Medians

Disc	R₁ (au)	R₂ (au)	σ₁ (au)	σ₂ (au)	C	Σ_c	PA (°)	Δ α (mas)	Δ δ (mas)	i (°)	F_* (μ Jy)

HD 10647	${89.1}_{- 0.8}^{+ 0.7}$ $89.1_{-0.8}^{+0.7}$	$164_{- 8}^{+ 6}$ $164_{-8}^{+6}$	${11.9}_{- 0.9}^{+ 1.0}$ $11.9_{-0.9}^{+1.0}$	$46_{- 3}^{+ 3}$ $46_{-3}^{+3}$	${0.664}_{- 0.010}^{+ 0.009}$ $0.664_{-0.010}^{+0.009}$	$- {4.438}_{- 0.012}^{+ 0.012}$ $-4.438_{-0.012}^{+0.012}$	${56.93}_{- 0.05}^{+ 0.06}$ $56.93_{-0.05}^{+0.06}$	$121_{- 10}^{+ 10}$ $121_{-10}^{+10}$	$- 23_{- 7}^{+ 9}$ $-23_{-7}^{+9}$	${79.00}_{- 0.18}^{+ 0.12}$ $79.00_{-0.18}^{+0.12}$	$130_{- 10}^{+ 10}$ $130_{-10}^{+10}$
HD 15115	${65.8}_{- 0.3}^{+ 0.6}$ $65.8_{-0.3}^{+0.6}$	${97.57}_{- 0.05}^{+ 0.07}$ $97.57_{-0.05}^{+0.07}$	${2.4}_{- 0.8}^{+ 1.0}$ $2.4_{-0.8}^{+1.0}$	${4.73}_{- 0.20}^{+ 0.18}$ $4.73_{-0.20}^{+0.18}$	${0.19}_{- 0.04}^{+ 0.06}$ $0.19_{-0.04}^{+0.06}$	$- {3.44}_{- 0.02}^{+ 0.04}$ $-3.44_{-0.02}^{+0.04}$	${98.460}_{- 0.013}^{+ 0.011}$ $98.460_{-0.013}^{+0.011}$	$36_{- 3}^{+ 2}$ $36_{-3}^{+2}$	$- 14_{- 0.9}^{+ 0.9}$ $-14_{-0.9}^{+0.9}$	${86.71}_{- 0.02}^{+ 0.03}$ $86.71_{-0.02}^{+0.03}$	$28_{- 6}^{+ 5}$ $28_{-6}^{+5}$
HD 61005	${69.4}_{- 0.4}^{+ 0.5}$ $69.4_{-0.4}^{+0.5}$	$95_{- 3}^{+ 2}$ $95_{-3}^{+2}$	${7.4}_{- 0.5}^{+ 0.5}$ $7.4_{-0.5}^{+0.5}$	${31.7}_{- 1.5}^{+ 1.6}$ $31.7_{-1.5}^{+1.6}$	${0.837}_{- 0.012}^{+ 0.012}$ $0.837_{-0.012}^{+0.012}$	$- {3.359}_{- 0.015}^{+ 0.016}$ $-3.359_{-0.015}^{+0.016}$	${70.29}_{- 0.03}^{+ 0.02}$ $70.29_{-0.03}^{+0.02}$	$0_{- 5}^{+ 5}$ $0_{-5}^{+5}$	$- 17_{- 2}^{+ 2}$ $-17_{-2}^{+2}$	${86.17}_{- 0.07}^{+ 0.05}$ $86.17_{-0.07}^{+0.05}$	$5_{- 4}^{+ 7}$ $5_{-4}^{+7}$
HD 92945	${57.0}_{- 0.8}^{+ 0.8}$ $57.0_{-0.8}^{+0.8}$	${102.7}_{- 1.5}^{+ 1.5}$ $102.7_{-1.5}^{+1.5}$	${5.5}_{- 1.1}^{+ 1.2}$ $5.5_{-1.1}^{+1.2}$	${25.1}_{- 1.9}^{+ 2.0}$ $25.1_{-1.9}^{+2.0}$	${0.52}_{- 0.03}^{+ 0.04}$ $0.52_{-0.03}^{+0.04}$	$- {4.10}_{- 0.03}^{+ 0.04}$ $-4.10_{-0.03}^{+0.04}$	${100.5}_{- 0.5}^{+ 0.5}$ $100.5_{-0.5}^{+0.5}$	$- 80_{- 30}^{+ 30}$ $-80_{-30}^{+30}$	$- 78_{- 16}^{+ 17}$ $-78_{-16}^{+17}$	${66.0}_{- 0.6}^{+ 0.5}$ $66.0_{-0.6}^{+0.5}$	$36_{- 15}^{+ 15}$ $36_{-15}^{+15}$
HD 109573	${77.61}_{- 0.16}^{+ 0.04}$ $77.61_{-0.16}^{+0.04}$	$84_{- 1.8}^{+ 2.1}$ $84_{-1.8}^{+2.1}$	${2.89}_{- 0.19}^{+ 0.18}$ $2.89_{-0.19}^{+0.18}$	$22_{- 4}^{+ 4}$ $22_{-4}^{+4}$	${0.977}_{- 0.009}^{+ 0.006}$ $0.977_{-0.009}^{+0.006}$	$- {2.77}_{- 0.02}^{+ 0.02}$ $-2.77_{-0.02}^{+0.02}$	${26.51}_{- 0.07}^{+ 0.05}$ $26.51_{-0.07}^{+0.05}$	${13.9}_{- 0.8}^{+ 0.8}$ $13.9_{-0.8}^{+0.8}$	$- {39.6}_{- 1.2}^{+ 1.2}$ $-39.6_{-1.2}^{+1.2}$	${76.65}_{- 0.09}^{+ 0.09}$ $76.65_{-0.09}^{+0.09}$	$38_{- 17}^{+ 17}$ $38_{-17}^{+17}$
HD 121617	${75.3}_{- 0.3}^{+ 0.4}$ $75.3_{-0.3}^{+0.4}$	$103_{- 5}^{+ 8}$ $103_{-5}^{+8}$	$6_{- 0.5}^{+ 0.5}$ $6_{-0.5}^{+0.5}$	$42_{- 7}^{+ 8}$ $42_{-7}^{+8}$	${0.952}_{- 0.010}^{+ 0.008}$ $0.952_{-0.010}^{+0.008}$	$- {3.17}_{- 0.02}^{+ 0.03}$ $-3.17_{-0.02}^{+0.03}$	${58.3}_{- 0.6}^{+ 0.6}$ $58.3_{-0.6}^{+0.6}$	$- 1_{- 2}^{+ 2}$ $-1_{-2}^{+2}$	$- 2_{- 2}^{+ 3}$ $-2_{-2}^{+3}$	${44.1}_{- 0.5}^{+ 0.6}$ $44.1_{-0.5}^{+0.6}$	$12_{- 8}^{+ 11}$ $12_{-8}^{+11}$
HD 131488	${90.84}_{- 0.08}^{+ 0.18}$ $90.84_{-0.08}^{+0.18}$	${96.1}_{- 0.7}^{+ 0.6}$ $96.1_{-0.7}^{+0.6}$	${0.96}_{- 0.19}^{+ 0.28}$ $0.96_{-0.19}^{+0.28}$	${19.3}_{- 1.3}^{+ 1.9}$ $19.3_{-1.3}^{+1.9}$	${0.966}_{- 0.006}^{+ 0.006}$ $0.966_{-0.006}^{+0.006}$	$- {2.08}_{- 0.10}^{+ 0.08}$ $-2.08_{-0.10}^{+0.08}$	${97.301}_{- 0.029}^{+ 0.012}$ $97.301_{-0.029}^{+0.012}$	${1.2}_{- 0.6}^{+ 0.6}$ $1.2_{-0.6}^{+0.6}$	$- {7.1}_{- 0.3}^{+ 0.3}$ $-7.1_{-0.3}^{+0.3}$	${84.87}_{- 0.03}^{+ 0.06}$ $84.87_{-0.03}^{+0.06}$	$38_{- 8}^{+ 8}$ $38_{-8}^{+8}$
HD 131835	${68.5}_{- 0.4}^{+ 0.4}$ $68.5_{-0.4}^{+0.4}$	${105.8}_{- 1.7}^{+ 2.0}$ $105.8_{-1.7}^{+2.0}$	${4.9}_{- 0.6}^{+ 0.6}$ $4.9_{-0.6}^{+0.6}$	${43.5}_{- 1.5}^{+ 1.3}$ $43.5_{-1.5}^{+1.3}$	${0.869}_{- 0.010}^{+ 0.011}$ $0.869_{-0.010}^{+0.011}$	$- {2.939}_{- 0.04}^{+ 0.04}$ $-2.939_{-0.04}^{+0.04}$	${58.95}_{- 0.18}^{+ 0.18}$ $58.95_{-0.18}^{+0.18}$	${1.6}_{- 1.8}^{+ 1.8}$ $1.6_{-1.8}^{+1.8}$	$- {5.6}_{- 1.4}^{+ 1.3}$ $-5.6_{-1.4}^{+1.3}$	${74.41}_{- 0.20}^{+ 0.20}$ $74.41_{-0.20}^{+0.20}$	$10_{- 7}^{+ 11}$ $10_{-7}^{+11}$
HD 206893	$42_{- 5}^{+ 5}$ $42_{-5}^{+5}$	$126_{- 3}^{+ 4}$ $126_{-3}^{+4}$	$6_{- 4}^{+ 9}$ $6_{-4}^{+9}$	$36_{- 3}^{+ 4}$ $36_{-3}^{+4}$	${0.38}_{- 0.17}^{+ 0.22}$ $0.38_{-0.17}^{+0.22}$	$- {4.57}_{- 0.12}^{+ 0.20}$ $-4.57_{-0.12}^{+0.20}$	$62_{- 3}^{+ 3}$ $62_{-3}^{+3}$	$- 10_{- 60}^{+ 60}$ $-10_{-60}^{+60}$	$30_{- 50}^{+ 50}$ $30_{-50}^{+50}$	$46_{- 2}^{+ 3}$ $46_{-2}^{+3}$	$14_{- 6}^{+ 6}$ $14_{-6}^{+6}$

Notes. The top half of the table describes the best fits, while the bottom half describes the median values and their uncertainties, as calculated from the 16th and 84th percentiles of the posterior distribution. The surface density normalisation Σ_c is parametrised as an exponent, with 10^Σ_c in units of g cm⁻². Although HD 15115, HD 107146, and HD 197481 are included in this table, these discs are better fit by variations of the triple power law or double power law functional forms. These results can be found in Table C.3.

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