Panchromatic view of the frigid Jovian exoplanet COCONUTS-2 b

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Volume 710 (June 2026)

A&A, 710 (2026) A46

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Table 1

Literature values of the physical properties of the COCONUTS-2 system.

COCONUTS-2A		Refs.
Spectral type	M3	(a)
T_eff (K)	3406±69	(c)
log(g)	4.83±0.03	(h)
[M/H]	0.00±0.08	(d)
Distance (pc)	10.888±0.002	(f)
Radial velocity (km.s⁻¹)	1.19±0.61	(e)
Age (Myr)	414±23	(j)
Mass (M_⊙)	0.37±0.011	(h)
Radius (R_⊙)	0.388±0.011	(h)

COCONUTS-2 b

Spectral type	T9	(b)
T_eff (K)	$483_{- 53}^{+ 44}$ $Mathematical equation: $483^{+44}_{-53}$$	(i)
log(g)	${4.19}_{- 0.13}^{+ 0.18}$ $Mathematical equation: $4.19^{+0.18}_{-0.13}$$	(i)
Semimajor axis (au)	$7506_{- 2060}^{+ 5205}$ $Mathematical equation: $7506^{+5205}_{-2060}$$	(h+)
Period (Myr)	${1.1}_{- 0.4}^{+ 1.3}$ $Mathematical equation: $1.1^{+1.3}_{-0.4}$$	(h+)
Age (Myr)	414±23	(j)
Mass (M_Jup)	8±2	(i)
Radius (R_Jup)	${1.11}_{- 0.04}^{+ 0.03}$ $Mathematical equation: $1.11^{+0.03}_{-0.04}$$	(i)

Notes. ^(a)Torres et al. (2006), ^(b)Kirkpatrick et al. (2011), ^(c)Gaidos et al. (2014), ^(d)Hojjatpanah et al. (2019), ^(e)Schneider et al. (2019), ^(f)Gaia Collaboration (2021), ^(g)Bailer-Jones et al. (2021), ^(h)Zhang et al. (2021a), ⁽ⁱ⁾Zhang et al. (2025) and ^(j)Kiman et al. (2026). The semimajor axis and orbital period were estimated using orbital predictions based on the eccentricity distributions from Dupuy & Liu (2011); Zhang et al. (2021a) measured a projected separation of 594”.

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