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 2

Gap location and widths, and inferred single planet masses.

Target	Gap	r_gap (au)	Δr_gap (au)	M_pl (M_J)	Consistent with direct imaging
HD 15115	1	79.3 $_{- 4.3}^{+ 4.0}$ $^{+4.0}_{-4.3}$	22.2 $_{- 0.6}^{+ 0.7}$ $^{+0.7}_{-0.6}$	0.37 $_{- 0.07}^{+ 0.09}$ $^{+0.09}_{-0.07}$	Y
HD 32297	1	79.9 $_{- 8.5}^{+ 6.4}$ $^{+6.4}_{-8.5}$	35.4 $_{- 1.2}^{+ 1.3}$ $^{+1.3}_{-1.2}$	2.0 $_{- 0.6}^{+ 0.9}$ $^{+0.9}_{-0.6}$	Y
HD 92945	1	72.6 $_{- 4.1}^{+ 4.7}$ $^{+4.7}_{-4.1}$	19.6 $_{- 1.7}^{+ 2.3}$ $^{+2.3}_{-1.7}$	0.20 $_{- 0.07}^{+ 0.10}$ $^{+0.10}_{-0.07}$	Y
HD 107146	1	57.3 $_{- 1.8}^{+ 2.8}$ $^{+2.8}_{-1.8}$	12.3 $_{- 0.6}^{+ 0.6}$ $^{+0.6}_{-0.6}$	0.11 $_{- 0.02}^{+ 0.03}$ $^{+0.03}_{-0.02}$	Y
	2	79.2 $_{- 2.6}^{+ 3.1}$ $^{+3.1}_{-2.6}$	18.9 $_{- 1.4}^{+ 2.7}$ $^{+2.7}_{-1.4}$	0.15 $_{- 0.05}^{+ 0.07}$ $^{+0.07}_{-0.05}$	Y
HD 131488	1	69.4 $_{- 6.2}^{+ 3.6}$ $^{+3.6}_{-6.2}$	26.1 $_{- 0.8}^{+ 1.0}$ $^{+1.0}_{-0.8}$	1.3 $_{- 0.3}^{+ 0.4}$ $^{+0.4}_{-0.3}$	Y
HD 131835	1	42.2 $_{- 9.1}^{+ 6.8}$ $^{+6.8}_{-9.1}$	25.2 $_{- 3.9}^{+ 3.3}$ $^{+3.3}_{-3.9}$	6.3 $_{- 3.5}^{+ 8.6}$ $^{+8.6}_{-3.5}$	Y
	2	84.8 $_{- 4.2}^{+ 4.9}$ $^{+4.9}_{-4.2}$	18.9 $_{- 1.8}^{+ 2.3}$ $^{+2.3}_{-1.8}$	0.20 $_{- 0.07}^{+ 0.10}$ $^{+0.10}_{-0.07}$	N
HD 197481	1	17.0 $_{- 6.0}^{+ 3.6}$ $^{+3.6}_{-6.0}$	14.1 $_{- 1.4}^{+ 2.1}$ $^{+2.1}_{-1.4}$	7.1 $_{- 4.5}^{+ 16.7}$ $^{+16.7}_{-4.5}$	N
	2	32.5 $_{- 1.8}^{+ 1.8}$ $^{+1.8}_{-1.8}$	4.1 $_{- 1.2}^{+ 1.3}$ $^{+1.3}_{-1.2}$	0.010 $_{- 0.007}^{+ 0.015}$ $^{+0.015}_{-0.007}$	Y
HD 206893	1	73.5 $_{- 12.0}^{+ 10.8}$ $^{+10.8}_{-12.0}$	40.4 $_{- 4.3}^{+ 4.6}$ $^{+4.6}_{-4.3}$	3.7 $_{- 1.8}^{+ 3.6}$ $^{+3.6}_{-1.8}$	Y

Notes. Gap location and widths are measured from the frank surface density profiles. The planet masses correspond to a single planet required to clear the measured widths (see Eq. (1)). These values are not tested for consistency with the gap depth. The rightmost column lists whether such a planet is consistent with current constraints from the available direct imaging observations based on the detection probability maps in Milli et al. (2026), i.e. ‘Y’ means not expected to be detected by available observations at 50%.

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