High CO/H2 ratio supports an exocometary origin for a CO-rich debris disc

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Table 1

Stellar and disc parameters for HD 131488 and HD 110058.

Parameter	HD 131488	References	HD 110058	References
Spectral Type	A1 V	[1]	A0 V	[2]
RA (J2000)	14 55 08.03	[1]	12 39 46.14	[2]
Dec (J2000)	−41 07 13.3	[1]	−49 11 55.84	[2]
K-band Magnitude	7.803	[3]	7.583	[3]
Radial Velocity (km s⁻¹)	${5.97}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $5.97^{+0.05}_{-0.05}$$	[8]	${12.53}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $12.53^{+0.01}_{-0.01}$$	[8]
Distance (pc)	$152_{- 0.2}^{+ 3.2}$ $Mathematical equation: $152^{+3.2}_{-0.2}$$	[4]	$130_{- 0.2}^{+ 2}$ $Mathematical equation: $130^{+2}_{-0.2}$$	[4]
Association	Upper Centaurus Lupus	[1]	Lower Centaurus Crux	[2]
Age	−16 Myr	[1]	−17 Myr	[2]
Log(g)	${3.80}_{- 0.16}^{+ 0.38}$ $Mathematical equation: $3.80^{+0.38}_{-0.16}$$	[4]	${3.54}_{- 0.01}^{+ 0.41}$ $Mathematical equation: $3.54^{+0.41}_{-0.01}$$	[4]
Stellar radius (R_⊙)	${1.60}_{- 0.02}^{+ 0.03}$ $Mathematical equation: $1.60^{+0.03}_{-0.02}$$	[4]	${1.55}_{- 0.04}^{+ 0.02}$ $Mathematical equation: $1.55^{+0.02}_{-0.04}$$	[4]
Stellar mass (M_⊙)	1.8	[5]	1.84	[2]
Disc inclination (°)	$82_{- 3}^{+ 3}$ $Mathematical equation: $82^{+3}_{-3}$$	[6]	${85.5}_{- 7.2}^{+ 2.5}$ $Mathematical equation: $85.5^{+2.5}_{-7.2}$$	[2]
R_in (au)	$35_{- 11}^{+ 11}$ $Mathematical equation: $35^{+11}_{-11}$$	[7]	${7.4}_{- 7.3}^{+ 2.2}$ $Mathematical equation: $7.4^{+2.2}_{-7.3}$$	[2]
R_out (au)	$140_{- 11}^{+ 11}$ $Mathematical equation: $140^{+11}_{-11}$$	[7]	80 ± 12	[2]
log(N_CO (cm⁻²))	${18.1}_{- 0.1}^{+ 0.2}$ $Mathematical equation: $18.1^{+0.2}_{-0.1}$$	[4]	${19.7}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $19.7^{+0.1}_{-0.1}$$	[4]
T_gas (K)	$141_{- 55}^{+ 103}$ $Mathematical equation: $141^{+103}_{-55}$$	[8]	${133.0}_{- 18}^{+ 19}$ $Mathematical equation: $133.0^{+19}_{-18}$$	[8]

Notes. [1] Melis et al. (2013); [2] Hales et al. (2022); [3] Cutri et al. (2003); [4] Brennan et al. (2024); [5] Matrà et al. (2018a); [6] Moór et al. (2017); [7] Smirnov-Pinchukov et al. (2022); [8] This work. T_gas is the kinetic temperature from the ¹²CO observations summarised in Appendix C. It equals the kinetic temperature only if the system is in LTE and the H₂ is co-located with the CO. The radii R_in and R_out correspond to the CO disc, while the disc inclination is derived from the dust disc. The radial velocity is given in the barycentric frame.

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