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 5

Median values and 68% confidence interval for parameters of the outer companion of HD 88986 based on the joint analysis of the HIPPARCOS/Gaia astrometric and RV data.

Parameter (unit)	The outer companion posteriors
Stellar parameters
M_* (M_⊙)	${1.20}_{- 0.06}^{0.07}$ $1.20_{ - 0.06}^{0.07}$
Parallax (mas)	30.025 ± 0.023
σ_* (m s⁻¹)	${3.3}_{- 0.1}^{+ 0.2}$ $3.3_{ - 0.1}^{ + 0.2}$
The outer companion parameters
P (yr)	$116_{- 34}^{+ 40}$ $116_{ - 34}^{ + 40}$
T_c (BJD-2 400 000 d)	65 000 ± 2000
a (au)	${26.2}_{- 5.5}^{+ 6.4}$ $26.2_{ - 5.5}^{ + 6.4}$
$\sqrt{e} \cos ω$ $\sqrt e \cos \,\,\omega$	${0.47}_{- 0.24}^{+ 0.16}$ $0.47_{ - 0.24}^{ + 0.16}$
$\sqrt{e} \sin ω$ $\sqrt e \sin \,\,\omega$	$- {0.47}_{- 0.10}^{+ 0.13}$ $- 0.47_{ - 0.10}^{ + 0.13}$
e	0.46 ± 0.13
ω (°)	${314.9}_{- 21.4}^{+ 14.4}$ $314.9_{ - 21.4}^{ + 14.4}$
I (°)	${54.5}_{- 18.8}^{+ 21.3}$ $54.5_{ - 18.8}^{ + 21.3}$ or ${135.5}_{- 19.4}^{+ 18.4}$ $135.5_{ - 19.4}^{ + 18.4}$
Ω (°)	${29.1}_{- 3.6}^{+ 8.5}$ ${29.1_{ - 3.6}^{ + 8.5}}$
M_c (M_Jup)	$145_{- 48}^{+ 73}$ $145_{ - 48}^{ + 73}$
Instrumental parameters:
mu_ELODIE (m s⁻¹)	$29 220_{- 110}^{+ 180}$ ${29\,\,220_{ - 110}^{ + 180}}$
mu_SOPHIE (m s⁻¹)	$29 320_{- 110}^{+ 180}$ ${29\,\,320_{ - 110}^{ + 180}}$
mu_SOPHIE+ (m s⁻¹)	$29 320_{- 110}^{+ 180}$ ${29\,\,320_{ - 110}^{ + 180}}$
mu_HIRES (m s⁻¹)	$240_{- 110}^{+ 180}$ ${240_{ - 110}^{ + 180}}$
mu_HIRES+ (m s⁻¹)	$240_{- 110}^{+ 180}$ ${240_{ - 110}^{ + 180}}$

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