RedDots: Multiplanet system around M dwarf GJ 887 in the solar neighborhood

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Volume 707 (March 2026)

A&A, 707 (2026) A93

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Table 3

Table of posterior medians and 1σ-intervals of model D^a.

Parameter	planet e	planet b	planet c	planet d
P (days]	${4.42490}_{- 0.00013}^{+ 0.00014}$ $Mathematical equation: $4.42490_{-0.00013}^{+0.00014}$$	${9.2619}_{- 0.0005}^{+ 0.0005}$ $Mathematical equation: $9.2619_{-0.0005}^{+0.0005}$$	${21.784}_{- 0.004}^{+ 0.004}$ $Mathematical equation: $21.784_{-0.004}^{+0.004}$$	${50.77}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $50.77_{-0.05}^{+0.05}$$
K (m/s)	${0.91}_{- 0.10}^{+ 0.10}$ $Mathematical equation: $0.91_{-0.10}^{+0.10}$$	${2.00}_{- 0.17}^{+ 0.17}$ $Mathematical equation: $2.00_{-0.17}^{+0.17}$$	${2.54}_{- 0.27}^{+ 0.27}$ $Mathematical equation: $2.54_{-0.27}^{+0.27}$$	${1.7}_{- 0.4}^{+ 0.4}$ $Mathematical equation: $1.7_{-0.4}^{+0.4}$$
t₀ (BJD)	${2453488.05}_{- 0.13}^{+ 0.13}$ $Mathematical equation: $2453488.05_{-0.13}^{+0.13}$$	${2453492.75}_{- 0.27}^{+ 0.27}$ $Mathematical equation: $2453492.75_{-0.27}^{+0.27}$$	${2453498.2}_{- 0.9}^{+ 0.9}$ $Mathematical equation: $2453498.2_{-0.9}^{+0.9}$$	$2453496_{- 4}^{+ 4}$ $Mathematical equation: $2453496_{-4}^{+4}$$
e	—	${0.14}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $0.14_{-0.06}^{+0.06}$$	${0.17}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $0.17_{-0.06}^{+0.06}$$	—
ω (rad)	—	${3.1}_{- 2.2}^{+ 2.2}$ $Mathematical equation: $3.1_{-2.2}^{+2.2}$$	${3.5}_{- 2.4}^{+ 2.0}$ $Mathematical equation: $3.5_{-2.4}^{+2.0}$$	—
M sin i,(M_⊕)	${1.46}_{- 0.18}^{+ 0.19}$ $Mathematical equation: $1.46_{-0.18}^{+0.19}$$	${3.9}_{- 0.5}^{+ 0.5}$ $Mathematical equation: $3.9_{-0.5}^{+0.5}$$	${6.5}_{- 0.9}^{+ 1.0}$ $Mathematical equation: $6.5_{-0.9}^{+1.0}$$	${6.1}_{- 1.4}^{+ 1.4}$ $Mathematical equation: $6.1_{-1.4}^{+1.4}$$
a (AU)	${0.0417}_{- 0.0015}^{+ 0.0014}$ $Mathematical equation: $0.0417_{-0.0015}^{+0.0014}$$	${0.0683}_{- 0.0024}^{+ 0.0022}$ $Mathematical equation: $0.0683_{-0.0024}^{+0.0022}$$	${0.121}_{- 0.005}^{+ 0.004}$ $Mathematical equation: $0.121_{-0.005}^{+0.004}$$	${0.212}_{- 0.008}^{+ 0.007}$ $Mathematical equation: $0.212_{-0.008}^{+0.007}$$
T_eq (K)	$544_{- 20}^{+ 21}$ $Mathematical equation: $544_{-20}^{+21}$$	$426_{- 16}^{+ 16}$ $Mathematical equation: $426_{-16}^{+16}$$	$320_{- 12}^{+ 13}$ $Mathematical equation: $320_{-12}^{+13}$$	$241_{- 9}^{+ 10}$ $Mathematical equation: $241_{-9}^{+10}$$
S (S_⊕)	${20.9}_{- 2.9}^{+ 4.0}$ $Mathematical equation: $20.9_{-2.9}^{+4.0}$$	${7.8}_{- 1.1}^{+ 1.3}$ $Mathematical equation: $7.8_{-1.1}^{+1.3}$$	${2.5}_{- 0.4}^{+ 0.4}$ $Mathematical equation: $2.5_{-0.4}^{+0.4}$$	${0.81}_{- 0.12}^{+ 0.13}$ $Mathematical equation: $0.81_{-0.12}^{+0.13}$$
θ (mas)	${12.7}_{- 0.5}^{+ 0.5}$ $Mathematical equation: $12.7_{-0.5}^{+0.5}$$	${20.8}_{- 0.8}^{+ 0.7}$ $Mathematical equation: $20.8_{-0.8}^{+0.7}$$	${36.7}_{- 1.3}^{+ 1.2}$ $Mathematical equation: $36.7_{-1.3}^{+1.2}$$	${64.6}_{- 2.2}^{+ 2.1}$ $Mathematical equation: $64.6_{-2.2}^{+2.1}$$
C × 10⁻⁹	$103_{- 7}^{+ 8}$ $Mathematical equation: $103_{-7}^{+8}$$	$75_{- 5}^{+ 6}$ $Mathematical equation: $75_{-5}^{+6}$$	$63_{- 4}^{+ 5}$ $Mathematical equation: $63_{-4}^{+5}$$	${38.1}_{- 2.4}^{+ 2.8}$ $Mathematical equation: $38.1_{-2.4}^{+2.8}$$

RV parameters

μ_HARPSpre (m/s)	${8.2}_{- 0.8}^{+ 0.8}$ $Mathematical equation: $8.2_{-0.8}^{+0.8}$$	—	—	—
σ_w,HARPSpre (m/s)	${0.66}_{- 0.12}^{+ 0.13}$ $Mathematical equation: $0.66_{-0.12}^{+0.13}$$	—	—	—
μ_HARPSpost (m/s)	$- {7.6}_{- 0.9}^{+ 0.9}$ $Mathematical equation: $-7.6_{-0.9}^{+0.9}$$	—	—	—
σ_w,HARPSpost (m/s)	${0.17}_{- 0.15}^{+ 0.25}$ $Mathematical equation: $0.17_{-0.15}^{+0.25}$$	—	—	—
μ_HARPSpw (m/s)	${1.9}_{- 1.1}^{+ 1.2}$ $Mathematical equation: $1.9_{-1.1}^{+1.2}$$	—	—	—
σ_w,HARPSpw (m/s)	${0.10}_{- 0.08}^{+ 0.40}$ $Mathematical equation: $0.10_{-0.08}^{+0.40}$$	—	—	—
μ_ESPRESSO (m/s)	${9136.8}_{- 0.6}^{+ 0.7}$ $Mathematical equation: $9136.8_{-0.6}^{+0.7}$$	—	—	—
σ_w,ESPRESSO (m/s)	${1.4}_{- 0.4}^{+ 0.5}$ $Mathematical equation: $1.4_{-0.4}^{+0.5}$$	—	—	—

GP parameters

σ_GP,HARPSpre (m/s)	${3.6}_{- 0.5}^{+ 0.5}$ $Mathematical equation: $3.6_{-0.5}^{+0.5}$$	—	—	—
σ_GP,HARPSpost (m/s)	${4.0}_{- 0.5}^{+ 0.6}$ $Mathematical equation: $4.0_{-0.5}^{+0.6}$$	—	—	—
σ_GP,HARPSpw (m/s)	${2.6}_{- 0.6}^{+ 0.8}$ $Mathematical equation: $2.6_{-0.6}^{+0.8}$$	—	—	—
σ_GP,ESPRESSO (m/s)	${0.16}_{- 0.14}^{+ 0.70}$ $Mathematical equation: $0.16_{-0.14}^{+0.70}$$	—	—	—
P_rot,GP (days⁻²)	${38.6}_{- 0.5}^{+ 0.6}$ $Mathematical equation: $38.6_{-0.5}^{+0.6}$$	—	—	—
Γ_GP	${4.2}_{- 0.7}^{+ 0.9}$ $Mathematical equation: $4.2_{-0.7}^{+0.9}$$	—	—	—
α_GP (days⁻²)	${0.00031}_{- 0.00010}^{+ 0.00017}$ $Mathematical equation: $0.00031_{-0.00010}^{+0.00017}$$	—	—	—

Notes. ^(a)Quasi-periodic kernel; derived parameters: (projected) planet mass M sin i, the semi-major axis a, the equilibrium temperature T_eq, stellar influx S, angular separation θ and contrast C assuming an Earth-like albedo of 0.3.

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