The SOPHIE search for northern extrasolar planets - XIX. A system including a cold sub-Neptune potentially transiting a V = 6.5 star HD 88986

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Volume 681 (January 2024)

A&A, 681 (2024) A55

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Table 3

Median values and 68% confidence interval of parameters for HD 88986 b based on the joint analysis of the photometric and RV data by juliet (see Sect. 7 and Fig. 8).

Parameter (unit)	Posterior HD 88986 b
Stellar parameters:
ρ_* (kg m⁻³)	$472_{- 35}^{+ 38}$ ${472_{ - 35}^{ + 38}}$
Planet parameters
P^* (d)	${146.05}_{- 0.40}^{+ 0.43}$ ${146.05_{ - 0.40}^{ + 0.43}}$
T_c (BJD-2 400 000)	58 891.690 ± 0.003
K (m s⁻¹)	1.85 ± 0.34
e	0.24 ± 0.05
ω (º)	$306_{- 11}^{+ 10}$ $306_{ - 11}^{ + 10}$
Rp/R_*	0.0148 ± 0.0004
b	${0.21}_{- 0.14}^{+ 0.17}$ $0.21_{ - 0.14}^{ + 0.17}$
a/R_*	81.1 ± 2.1
TESS instrumental parameters:
M_TESS (ppm)	−0.0000001 ± 0.0000014
σ_ω,TESS (ppm)	143.4 ± 1.3
q1	${0.27}_{- 0.14}^{+ 0.17}$ $0.27_{ - 0.14}^{ + 0.17}$
SOPHIE+ instrumental parameters:
σ_SOPHIE+ (m s⁻¹)	${2.09}_{- 0.17}^{+ 0.16}$ $2.09_{ - 0.17}^{ + 0.16}$
mu_SOPHIE+ (m s⁻¹)	29 090 6 ± 0 4
Drift on SOPHIE+:
A (m s⁻¹)	0.0165 ± 0.0003
Q (m s⁻¹)	0.0000039 ± 0.0000002
QP-GP on SOPHIE+:
B_GP (m s⁻¹)	${4.0}_{- 0.8}^{+ 1.1}$ $4.0_{ - 0.8}^{ + 1.1}$
C_GP (m s⁻¹)	10⁻²⁰ (fixed)
P_rot (d)	30.0 ± 2.0
L_GP (d)	$29_{- 18}^{+ 37}$ $29_{ - 18}^{ + 37}$

Derived planet parameters:
a (au)	0.58 ± 0.04
i (°)	89.9 ± 0.1
R_p (R_⊕)	2.49 ± 0.18
M_p (M_⊕)	${17.2}_{- 3.8}^{+ 4.0}$ $17.2_{ - 3.8}^{ + 4.0}$
ρ_p (g cm⁻³)	${6.1}_{- 2.3}^{+ 3.3}$ $6.1_{ - 2.3}^{ + 3.3}$
T_eq (K)	460±8

Notes.^(*) See the refined period in Table 4.

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