A joint effort to discover and characterize two resonant mini-Neptunes around TOI-1803 with TESS, HARPS-N, and CHEOPS

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Volume 695 (March 2025)

A&A, 695 (2025) A273

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Table A.1

Priors and results for the modeling of planets b and c from the analysis of the photometric and radial velocities time series. Circular orbits.

Combined Radial Velocities – Multidimensional GP – Photometric fit

Parameter	Unit	Prior	Value

	Star
Stellar density (ρ_⋆)	ρ_⊙	N(2.00, 0.13)	2.03±0.13
CHEOPS Limb Darkening (q_1,CHEOPS)		u(0,1)	${0.497}_{- 0.079}^{+ 0.085}$ $0.497_{ - 0.079}^{ + 0.085}$
CHEOPS Limb Darkening (q_2,CHEOPS)		u(0,1)	${0.461}_{- 0.034}^{+ 0.039}$ $0.461_{ - 0.034}^{ + 0.039}$
TESS Limb Darkening (q_1,TESS)		u(0,1)	${0.49}_{- 0.09}^{+ 0.10}$ $0.49_{ - 0.09}^{ + 0.10}$
TESS Limb Darkening (q_2,TESS)		u(0,1)	${0.38}_{- 0.033}^{+ 0.039}$ $0.38_{ - 0.033}^{ + 0.039}$

Planet b

Parameter	Unit	Prior	Value

Orbital period (P_b)	days	u(6.2, 6.4)	6.293287±0.000028
Central time of transit (T_0,b)	BTJD^a	u(1904,1905)	1904.6237±0.0027
Impact parameter (b)		u(0, 1)	${0.34}_{- 0.14}^{+ 0.09}$ $0.34_{ - 0.14}^{ + 0.09}$
R_p / R_⋆		u(0.00001, 0.5)	0.038±0.001
Planetary Radius (R_p)	R_⊕	…	2.99 ± 0.08
a / R_⋆		…	18.2 ± 0.4
Semi-major axis a	AU	…	0.060 ± 0.001
Radial Velocity semi-amplitude (K)	m/s	u(0, 10)	4.4±1.0
Inclination (i)	deg	…	88.9 ± 0.5
Transit duration (T₁₄)	days	…	0.108 ± 0.003
Planetary mass (M_p)	M_⊕	…	10.3 ± 2.5
Planetary density (ρ_p)	ρ_⊕	…	0.39 ± 0.10
Instellation (F_i)	W m⁻²	…	(7.9±1.6)·104
Equilibrium Temperature (T_eq)	K^b	…	747 ± 11

Planet c

Parameter	Unit	Prior	Value

Orbital period (P_c)	days	u(12.8, 13.0)	12.885779±0.000036
Central time of transit (T_0,c)	BTJD^a	u(1911,1912)	1911.6747±0.0019
Impact parameter (b)		u(0, 1)	${0.779}_{- 0.015}^{+ 0.014}$ $0.779_{ - 0.015}^{ + 0.014}$
R_p / R_⋆		u(0.00001, 0.5)	0.055±0.001
Planetary Radius (R_p)	R_⊕	…	4.29 ± 0.08
a / R_⋆		…	29.3 ± 0.6
Semi-major axis _a	AU	…	0.097 ± 0.002
Radial Velocity semi-amplitude (K)	m/s	u(0, 10)	${2.1}_{- 1.0}^{+ 1.1}$ $2.1_{ - 1.0}^{ + 1.1}$
Inclination (i)	deg	…	88.48 ± 0.06
Transit duration (T₁₄)	days	…	0.0998 ± 0.0015
Planetary mass (M_p)	M_⊕	…	6.0 ± 3.0
Planetary density (ρ_p)	ρ_⊕	…	0.076 ± 0.038
Instellation (F_i)	W m⁻²	…	(3.0±0.6)·104
Equilibrium Temperature (T_eq)	K^b	…	588 ± 10

Activity

Stellar rotation period (P_rot)	days	u(12.0, 15.0)	${13.659}_{- 0.033}^{+ 0.029}$ $13.659_{ - 0.033}^{ + 0.029}$
Decay time (P_dec)	days	u(10, 2000)	$113_{- 24}^{+ 28}$ $113_{ - 24}^{ + 28}$
Coherence Scale (w)		N(0.35, 0.035)	${0.388}_{- 0.025}^{+ 0.026}$ $0.388_{ - 0.025}^{ + 0.026}$

Notes. ^(a)TESS Barycentric Julian Date (BJD_TDB - 2457000). ^(b)Computed as $T_{eq} = T_{⋆} {(\frac{R_{⋆}}{2 a})}^{1 / 2} {[f (1 - A_{b})]}^{1 / 4}$ ${T_{{\rm{eq}}}} = {T_ \star }{\left( {{{{R_ \star }} \over {2a}}} \right)^{1/2}}{\left[ {f\left( {1 - {A_b}} \right)} \right]^{1/4}}$ , assuming a Bond albedo A_b = 0.3 and f = 1.

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