Joint Rossiter-McLaughlin Revolutions analysis of the multi-planetary system GJ 9827

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Table A.1

System parameters used and derived in the analysis of GJ 9827.

Parameter	Symbol	Value	Unit	Reference
GJ 9827

Spectral type		K7V		1
Stellar radius	R_⋆	0.58 ± 0.03	R_⊙	1
Stellar temperature	T_eff	4236 ± 12	K	1
Stellar mass	M_⋆	0.62 ± 0.04	M_⊙	1
Stellar spin inclination	i_⋆	${90.8}_{- 35}^{+ 33}$ $Mathematical equation: $90.8^{+33}_{-35}$$	deg	0
Stellar equatorial period	P_rot	${28.16}_{- 2.66}^{+ 3.38}$ $Mathematical equation: $28.16^{+3.38}_{-2.66}$$	d	1
Stellar projected velocity	v sin i_⋆	${0.94}_{- 0.18}^{+ 0.23}$ $Mathematical equation: $0.94^{+0.23}_{-0.18}$$	km s⁻¹	0
Age	τ	5.465 ± 4.058	Gyr	1
Limb-darkening coefficients	u₁	${0.38}_{- 0.22}^{+ 0.23}$ $Mathematical equation: $0.38^{+0.23}_{-0.22}$$		1
	u₂	${0.52}_{- 0.30}^{+ 0.29}$ $Mathematical equation: $0.52^{+0.29}_{-0.30}$$		1

Planet b

Orbital period	P	1.208974 ± 0.000001	d	1
Transit epoch	T₀	2457738.8259 ± 0.0005	BJD	1
Eccentricity	e	0
Stellar reflex velocity	K	3.53±0.22	km s⁻¹	1
Scaled separation	a/R_⋆	${7.00708}_{- 0.38}^{+ 0.37}$ $Mathematical equation: $7.00708^{+0.37}_{-0.38}$$		1
Orbital inclination	i_b	${87.60}_{- 1.27}^{+ 1.31}$ $Mathematical equation: $87.60^{+1.31}_{-1.27}$$	deg	1
Transit duration	T₁₄	${1.28}_{- 0.020}^{+ 0.022}$ $Mathematical equation: $1.28^{+0.022}_{-0.020}$$	h	1
Planet-to-star radius ratio	R_p/R_⋆	0.0256		1
Sky-plane obliquity	λ	$9_{- 64}^{+ 67}$ $Mathematical equation: $9^{+67}_{-64}$$	deg	0
3D obliquity	Ψ	$54_{- 38}^{+ 26}$ $Mathematical equation: $54^{+26}_{-38}$$	deg	0

Planet c

Orbital period	P	${3.648103}_{- 0.000010}^{+ 0.000013}$ $Mathematical equation: $3.648103^{+0.000013}_{-0.000010}$$	d	1
Transit epoch	T₀	2457742.2000 ± 0.0014	BJD	1
Eccentricity	e	0
Stellar reflex velocity	K	1.06±0.21	km s⁻¹	1
Scaled separation	a/R_⋆	${14.64443}_{- 0.81}^{+ 0.78}$ $Mathematical equation: $14.64443^{+0.78}_{-0.81}$$		1
Orbital inclination	i_c	${89.09}_{- 0.68}^{+ 0.60}$ $Mathematical equation: $89.09^{+0.60}_{-0.68}$$	deg	1
Transit duration	T₁₄	1.83 ± 0.037	h	1
Planet-to-star radius ratio	R_p/R_⋆	0.0201		1
Sky-plane obliquity	λ	$- 21_{- 44}^{+ 43}$ $Mathematical equation: $-21^{+43}_{-44}$$	deg	0
3D obliquity	Ψ	$46_{- 30}^{+ 22}$ $Mathematical equation: $46^{+22}_{-30}$$	deg	0

Planet d

Orbital period	P	6.201830 ± 0.000003	d	2
Transit epoch	T₀	2460265.10196 ± +0.00006	BJD	2
Eccentricity	e	0
Stellar reflex velocity	K	1.44±0.27	km s⁻¹	1
Scaled separation	a/R_⋆	${20.87295}_{- 1.15}^{+ 1.08}$ $Mathematical equation: $20.87295^{+1.08}_{-1.15}$$		1
Orbital inclination	i_d	${87.66}_{- 0.16}^{+ 0.13}$ $Mathematical equation: $87.66^{+0.13}_{-0.16}$$	deg	1
Transit duration	T₁₄	${1.29}_{- 0.029}^{+ 0.035}$ $Mathematical equation: $1.29^{+0.035}_{-0.029}$$	h	1
Planet-to-star radius ratio	R_p/R_⋆	0.0327		1
Sky-plane obliquity	λ	−1 ± 26	deg	0
3D obliquity	Ψ	$33_{- 24}^{+ 16}$ $Mathematical equation: $33^{+16}_{-24}$$	deg	0

Notes. References : 0 - This work, 1 - Passegger et al. (2024), 2 - Piaulet-Ghorayeb et al. (2024).

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