A super-Earth orbiting the early-M dwarf GJ7 | Astronomy & Astrophysics (A&A)

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Volume 706 (February 2026)

A&A, 706 (2026) A166

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Table 3

GJ7 b (TOI-198 b) planetary parameters from the joint fit.

Parameter	Value Circular orbit	Description
P(d)	${10.215213}_{- 0.000010}^{+ 0.000011}$ $10.215213_{ - 0.000010}^{ + 0.000011}$	Orbital period
T₀ − 2458000	${356.37313}_{- 0.00089}^{+ 0.00089}$ $356.37313_{ - 0.00089}^{ + 0.00089}$	Mid-transit time
b	${0.22}_{- 0.15}^{+ 0.17}$ $0.22_{ - 0.15}^{ + 0.17}$	Impact parameter
R_p/R_∗	${0.02988}_{- 0.00080}^{+ 0.00087}$ $0.02988_{ - 0.00080}^{ + 0.00087}$	Scaled planetary radius
K (m s–¹)	${1.673}_{- 0.240}^{+ 0.207}$ $1.673_{ - 0.240}^{ + 0.207}$	Keplerian amplitude
e	≤0.15	Orbital eccentricity
ω (deg)	90 (fixed)	Argument of periapsis
δ (ppm)	${892.9}_{- 47.0}^{+ 52.8}$ $892.9_{ - 47.0}^{ + 52.8}$	Transit photometric depth
i (deg)	${89.63}_{- 0.32}^{+ 0.24}$ $89.63_{ - 0.32}^{ + 0.24}$	Orbital inclination angle
a/R_∗	${34.69}_{- 1.93}^{+ 0.98}$ $34.69_{ - 1.93}^{ + 0.98}$	Scaled semimajor axis
a (au)	${0.0675}_{- 0.0082}^{+ 0.0067}$ $0.0675_{ - 0.0082}^{ + 0.0067}$	Semimajor axis
T₁₄ (h)	${2.26}_{- 0.18}^{+ 0.19}$ $2.26_{ - 0.18}^{ + 0.19}$	Transit duration
Mp (M_⊕)	${3.17}_{- 0.65}^{+ 0.64}$ $3.17_{ - 0.65}^{ + 0.64}$	Planet mass
R_p (R_⊕)	1.36 ± 0.13	Planet radius
ρ_p (g cm⁻³)	${6.89}_{- 2.78}^{+ 4.27}$ $6.89_{ - 2.78}^{ + 4.27}$	Planet mean density
T_eq (K) ^∗	$456_{- 27}^{+ 34}$ $456_{ - 27}^{ + 34}$	Planet equilibrium temperature
S (S_⊕)	${7.2}_{- 1.4}^{+ 2.4}$ $7.2_{ - 1.4}^{ + 2.4}$	Insolation = (L/L_⊙)/(a/1au)²
v_esc (km s⁻¹)	17.0 ± 2.7	Escape velocity
TSM	${7.4}_{- 3.7}^{+ 8.2}$ $7.4_{ - 3.7}^{ + 8.2}$	Transmission spectroscopy metric

Notes.^∗ Computed for null albedo.

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