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 4

Outer slopes, mean particle eccentricities, and fractional widths for the ARKS sample.

Disc	α_out	e_rms		Δ R/R
		Median	Upper limit
HD 9672	$- {1.11}_{- 0.09}^{+ 0.08}$ $-1.11_{-0.09}^{+0.08}$	${0.69}_{- 0.06}^{+ 0.05}$ $0.69_{-0.06}^{+0.05}$	0.86	${1.27}_{- 0.06}^{+ 0.06}$ $1.27_{-0.06}^{+0.06}$

HD 10647	$- {1.24}_{- 0.08}^{+ 0.04}$ $-1.24_{-0.08}^{+0.04}$			${0.34}_{- 0.02}^{+ 0.02}$ $0.34_{-0.02}^{+0.02}$

HD 14055	$- {3.1}_{- 1.0}^{+ 0.7}$ $-3.1_{-1.0}^{+0.7}$	${0.24}_{- 0.08}^{+ 0.06}$ $0.24_{-0.08}^{+0.06}$	0.56	${0.99}_{- 0.09}^{+ 0.08}$ $0.99_{-0.09}^{+0.08}$

HD 15115	$- {16.3}_{- 0.8}^{+ 0.6}$ $-16.3_{-0.8}^{+0.6}$	${0.047}_{- 0.002}^{+ 0.002}$ $0.047_{-0.002}^{+0.002}$	0.052	${0.114}_{- 0.005}^{+ 0.004}$ $0.114_{-0.005}^{+0.004}$
HD 15115	$- {16.3}_{- 0.8}^{+ 0.6}$ $-16.3_{-0.8}^{+0.6}$	${0.047}_{- 0.002}^{+ 0.002}$ $0.047_{-0.002}^{+0.002}$	0.052	${0.086}_{- 0.029}^{+ 0.036}$ $0.086_{-0.029}^{+0.036}$

HD 15257	$- {3.1}_{- 2.9}^{+ 1.3}$ $-3.1_{-2.9}^{+1.3}$	${0.25}_{- 0.23}^{+ 0.10}$ $0.25_{-0.23}^{+0.10}$	1.2	${1.3}_{- 0.4}^{+ 0.3}$ $1.3_{-0.4}^{+0.3}$

HD 32297	$- {6.30}_{- 0.12}^{+ 0.12}$ $-6.30_{-0.12}^{+0.12}$			${0.134}_{- 0.006}^{+ 0.006}$ $0.134_{-0.006}^{+0.006}$

HD 39060	$- {4.8}_{- 0.8}^{+ 0.8}$ $-4.8_{-0.8}^{+0.8}$	${0.16}_{- 0.03}^{+ 0.03}$ $0.16_{-0.03}^{+0.03}$	0.24	${0.94}_{- 0.06}^{+ 0.05}$ $0.94_{-0.06}^{+0.05}$

HD 61005	$- {4.26}_{- 0.09}^{+ 0.08}$ $-4.26_{-0.09}^{+0.08}$	${0.181}_{- 0.004}^{+ 0.003}$ $0.181_{-0.004}^{+0.003}$	0.19	${0.269}_{- 0.015}^{+ 0.017}$ $0.269_{-0.015}^{+0.017}$

HD 76582	$- {2.7}_{- 0.4}^{+ 0.3}$ $-2.7_{-0.4}^{+0.3}$	${0.29}_{- 0.04}^{+ 0.03}$ $0.29_{-0.04}^{+0.03}$	0.40	${0.86}_{- 0.07}^{+ 0.05}$ $0.86_{-0.07}^{+0.05}$

HD 84870	$- {2.0}_{- 0.7}^{+ 0.5}$ $-2.0_{-0.7}^{+0.5}$	${0.39}_{- 0.13}^{+ 0.10}$ $0.39_{-0.13}^{+0.10}$	1.1	${1.1}_{- 0.2}^{+ 0.4}$ $1.1_{-0.2}^{+0.4}$

HD 92945	$- 11_{- 3}^{+ 3}$ $-11_{-3}^{+3}$	${0.07}_{- 0.02}^{+ 0.02}$ $0.07_{-0.02}^{+0.02}$	0.14	${0.23}_{- 0.05}^{+ 0.05}$ $0.23_{-0.05}^{+0.05}$
HD 92945	$- 11_{- 3}^{+ 3}$ $-11_{-3}^{+3}$	${0.07}_{- 0.02}^{+ 0.02}$ $0.07_{-0.02}^{+0.02}$	0.14	${0.58}_{- 0.04}^{+ 0.05}$ $0.58_{-0.04}^{+0.05}$

HD 95086	$- {2.5}_{- 0.3}^{+ 0.2}$ $-2.5_{-0.3}^{+0.2}$	${0.31}_{- 0.04}^{+ 0.02}$ $0.31_{-0.04}^{+0.02}$	0.41	${0.89}_{- 0.06}^{+ 0.07}$ $0.89_{-0.06}^{+0.07}$

HD 107146	$- {11.4}_{- 0.5}^{+ 0.6}$ $-11.4_{-0.5}^{+0.6}$	${0.068}_{- 0.003}^{+ 0.003}$ $$0.068_{-0.003}^{+0.003}$	3.0	${0.29}_{- 0.03}^{+ 0.02}$ $0.29_{-0.03}^{+0.02}$
				${0.497}_{- 0.003}^{+ 0.005}$ $0.497_{-0.003}^{+0.005}$
				${0.12}_{- 0.03}^{+ 0.04}$ $0.12_{-0.03}^{+0.04}$

HD 109573	$- {21.7}_{- 1.5}^{+ 1.2}$ $-21.7_{-1.5}^{+1.2}$	${0.035}_{- 0.002}^{+ 0.002}$ $0.035_{-0.002}^{+0.002}$	0.041	${0.081}_{- 0.003}^{+ 0.002}$ $0.081_{-0.003}^{+0.002}$

HD 121617	$- {6.9}_{- 0.4}^{+ 0.2}$ $-6.9_{-0.4}^{+0.2}$	${0.112}_{- 0.006}^{+ 0.003}$ $0.112_{-0.006}^{+0.003}$	0.12	${0.117}_{- 0.018}^{+ 0.017}$ $0.117_{-0.018}^{+0.017}$

HD 131488	$- {16.6}_{- 0.7}^{+ 0.8}$ $-16.6_{-0.7}^{+0.8}$			${0.072}_{- 0.003}^{+ 0.003}$ $0.072_{-0.003}^{+0.003}$

HD 131835	$- {2.96}_{- 0.05}^{+ 0.05}$ $-2.96_{-0.05}^{+0.05}$			${0.182}_{- 0.015}^{+ 0.016}$ $0.182_{-0.015}^{+0.016}$

HD 145560	$- {7.1}_{- 0.5}^{+ 0.4}$ $-7.1_{-0.5}^{+0.4}$	${0.108}_{- 0.008}^{+ 0.006}$ $0.108_{-0.008}^{+0.006}$	0.13	${0.315}_{- 0.015}^{+ 0.017}$ $0.315_{-0.015}^{+0.017}$

HD 161868	$- {3.7}_{- 0.8}^{+ 0.7}$ $-3.7_{-0.8}^{+0.7}$	${0.21}_{- 0.04}^{+ 0.04}$ $0.21_{-0.04}^{+0.04}$	0.38	${1.02}_{- 0.10}^{+ 0.19}$ $1.02_{-0.10}^{+0.19}$

HD 170773	$- 11_{- 5}^{+ 2}$ $-11_{-5}^{+2}$	${0.07}_{- 0.03}^{+ 0.01}$ $0.07_{-0.03}^{+0.01}$	0.12	${0.33}_{- 0.03}^{+ 0.04}$ $0.33_{-0.03}^{+0.04}$

HD 197481	$- {9.5}_{- 2.0}^{+ 1.5}$ $-9.5_{-2.0}^{+1.5}$	${0.08}_{- 0.02}^{+ 0.01}$ $0.08_{-0.02}^{+0.01}$	0.13	${0.14}_{- 0.05}^{+ 0.27}$ $0.14_{-0.05}^{+0.27}$
HD 197481	$- {9.5}_{- 2.0}^{+ 1.5}$ $-9.5_{-2.0}^{+1.5}$	${0.08}_{- 0.02}^{+ 0.01}$ $0.08_{-0.02}^{+0.01}$	0.13	${0.30}_{- 0.04}^{+ 0.21}$ $0.30_{-0.04}^{+0.21}$

HD 206893	$- {5.0}_{- 1.7}^{+ 1.2}$ $-5.0_{-1.7}^{+1.2}$	${0.15}_{- 0.05}^{+ 0.04}$ $0.15_{-0.05}^{+0.04}$	0.30	${0.3}_{- 0.2}^{+ 0.5}$ $0.3_{-0.2}^{+0.5}$
HD 206893	$- {5.0}_{- 1.7}^{+ 1.2}$ $-5.0_{-1.7}^{+1.2}$	${0.15}_{- 0.05}^{+ 0.04}$ $0.15_{-0.05}^{+0.04}$	0.30	${0.67}_{- 0.06}^{+ 0.08}$ $0.67_{-0.06}^{+0.08}$

TYC 9340-437-1	$- {3.3}_{- 0.7}^{+ 0.5}$ $-3.3_{-0.7}^{+0.5}$	${0.23}_{- 0.05}^{+ 0.04}$ $0.23_{-0.05}^{+0.04}$	0.35	${1.00}_{- 0.09}^{+ 0.09}$ $1.00_{-0.09}^{+0.09}$

HD 218396	$- {4.77}_{- 0.17}^{+ 0.30}$ $-4.77_{-0.17}^{+0.30}$	${0.161}_{- 0.006}^{+ 0.010}$ $0.161_{-0.006}^{+0.010}$	0.20	${0.72}_{- 0.10}^{+ 0.08}$ $0.72_{-0.10}^{+0.08}$

Notes. Multiple fractional widths (∆R/R) are reported for discs with multiple rings, but the mean particle eccentricity (e_rms) and the outer powerlaw index (α_out) are reported only for the outermost ring. Median eccentricities are calculated from the 50th percentile of α_out with 1 σ uncertainties, and upper limits on eccentricities are calculated from the 99.7th percentile of α_out. Eccentricities are not reported for discs with e_rms > ∆R/R as the relation between outer slope and eccentricity no longer holds in this case.

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