The ESO SupJup Survey - X. A carbon isotope contrast in the young ROXs 12 system

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Table 1

Properties of the ROXs 12 system from the literature.

Parameter	ROXs 12A	ROXs 12B
Spectral type	M0^(a)	L0^(a)
Mass	${0.65}_{- 0.09}^{+ 0.05} M_{⊙}^{(a)}$ $Mathematical equation: $0.65\,\substack{+0.05 \\ -0.09}\,M_{\odot}^{(\text{a})}$$	$17.5 \pm 1.5 M_{Jup}^{(a)}$ $Mathematical equation: $17.5\pm1.5\,M_\text{Jup}^{(\text{a})}$$
Semi-major axis (AU)	–	210 ± 20^(b)
Separation (″)	–	1.7^(b)
Distance (pc)	138.0 ± 0.3^(c)
RA, Dec (ICRS, J2000)	16:26:28.0397,	−25:26:47.7175^(c)
Radial velocity (km/s)	−5.8 ± 1.9^(d)	–
Rotational velocity (km/s)	7.21 ± 0.07^(d)	${3.6}_{- 1.6}^{+ 1.2}^{(e)}$ $Mathematical equation: $3.6\substack{+1.2 \\ -1.6}^{(\text{e})}$$
Age (Myr)	${6_{- 2}^{+ 4}}^{(a)}$ $Mathematical equation: $6\substack{+4 \\ -2}^{(\text{a})}$$
K_S (mag)	9.10 ± 0.03^(a)	14.14 ± 0.03^(a)
[Fe/H]	0.14 ± 0.01^(f)	${- {0.30}_{- 0.22}^{+ 0.26}}^{(e)}$ $Mathematical equation: $-0.30\,\substack{+0.26 \\ -0.22}^{(\text{e})}$$
Effective temperature [K]	${3850_{- 70}^{+ 100}}^{(b)}$ $Mathematical equation: $3850\,\substack{+100\\ -70}^{(\text{b})}$$	2500 ± 140^(e)

Notes. ^(a)Bowler et al. (2017), ^(b)Kraus et al. (2014), ^(c)Gaia Collaboration (2020), ^(d)Bowler et al. (2023), ^(e)Xuan et al. (2024a), ^(f)Swastik et al. (2021).

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