Long-period magnetic activity in the K dwarf GJ1137 and a new super-Earth on a 9-day orbit - A cautionary tale for Jovian-analogue detection from Doppler surveys

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Volume 708 (April 2026)

A&A, 708 (2026) A232

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Table 1

Stellar parameters of GJ 1137 and their 1σ uncertainties.

Parameter	Lovis et al. (2005)	This work	Ref.
Spectral type	K3 V	K2 IV-V	[5]
V (mag)	8.3	8.4571	[2]
B - V (mag)	0.945	0.981 ±0.013	[4]
Mass (M_⊙)	${0.70}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $0.70^{+0.04}_{-0.04}$$	${0.836}_{- 0.025}^{+ 0.023}$ $Mathematical equation: $0.836^{+0.023}_{-0.025}$$	[1]
Radius (R_⊙)		${0.837}_{- 0.018}^{+ 0.026}$ $Mathematical equation: $0.837^{+0.026}_{-0.018}$$	[1]
Age (Gyr)	—	${10.71}_{- 1.25}^{+ 2.24}$ $Mathematical equation: $10.71^{+2.24}_{-1.25}$$	[1]
Distance (pc)	—	${28.462}_{- 0.016}^{+ 0.019}$ $Mathematical equation: $28.462^{+0.019}_{-0.016}$$	[6]
π (mas)	34.6	${35.0393}_{- 0.0484}^{+ 0.0484}$ $Mathematical equation: $35.0393^{+0.0484}_{-0.0484}$$	[3]
Luminosity (L_⊙)	0.41	${0.407}_{- 0.031}^{+ 0.038}$ $Mathematical equation: $0.407^{+0.038}_{-0.031}$$	[1]
T_eff (K)	$4995_{- 50}^{+ 50}$ $Mathematical equation: $4995^{+50}_{-50}$$	${5033.8}_{- 77.2}^{+ 85.7}$ $Mathematical equation: $5033.8^{+85.7}_{-77.2}$$	[1]
log g (cm ∙ s⁻²)	–	4.23 ± 0.07	[1]
[Fe/H]	0.15 ± 0.06	0.13 ± 0.07	[1]

References. 1 - This work. 2 - van Leeuwen (2007). 3 - Gaia Collaboration (2018). 4 - da Silva et al. (2006). 5 - Gray et al. (2006). 6 -Bailer-Jones et al. (2021).

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