The GAPS Programme at TNG - LXV. Precise density measurement of TOI-1430 b, a young planet with an evaporating atmosphere

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Volume 693 (January 2025)

A&A, 693 (2025) A32

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Table 2

Stellar activity with multidimensional GP and parameters of TOI-1430 b.

Parameter	Unit	Prior	Value
TOI-1430 Stellar activity
Stellar rotational period (P_rot)	days	𝒩 (11.9,0.3)	${12.17}_{- 0.12}^{+ 0.12}$ $12.17_{ - 0.12}^{ + 0.12}$
Decay timescale of activity (P_dec)	days	𝓤(13,1000)	${26.8}_{- 1.6}^{+ 1.9}$ $26.8_{ - 1.6}^{ + 1.9}$
Coherence scale (w)		…	${0.65}_{- 0.17}^{+ 0.17}$ $0.65_{ - 0.17}^{ + 0.17}$
HARPS-N RV offset	ms⁻¹	…	$- {27244.83}_{- 0.89}^{+ 0.87}$ $- 27244.83_{ - 0.89}^{ + 0.87}$
Uncorrelated HARPS-N RV jitter	ms⁻¹	…	${3.22}_{- 0.23}^{+ 0.24}$ $3.22_{ - 0.23}^{ + 0.24}$
HARPS-N V_c	ms⁻¹	…	${3.51}_{- 0.49}^{+ 0.57}$ $3.51_{ - 0.49}^{ + 0.57}$
HARPS-N V_r	ms⁻¹	…	${31.1}_{- 4.1}^{+ 4.9}$ $31.1_{ - 4.1}^{ + 4.9}$
HIRES RV offset	ms⁻¹	…	${0.49}_{- 0.83}^{+ 0.82}$ $0.49_{ - 0.83}^{ + 0.82}$
Uncorrelated HIRES RV jitter	ms⁻¹	…	${3.21}_{- 0.29}^{+ 0.32}$ $3.21_{ - 0.29}^{ + 0.32}$
HIRES V_c	ms⁻¹	…	${3.12}_{- 0.47}^{+ 0.56}$ $3.12_{ - 0.47}^{ + 0.56}$
HIRES V_r	ms⁻¹	…	${26.3}_{- 4.0}^{+ 4.8}$ $26.3_{ - 4.0}^{ + 4.8}$
APF RV offset	ms⁻¹	…	$- {9.3}_{- 4.1}^{+ 3.6}$ $- 9.3_{ - 4.1}^{ + 3.6}$
Uncorrelated APF RV jitter	ms⁻¹	…	${3.8}_{- 2.0}^{+ 2.1}$ $3.8_{ - 2.0}^{ + 2.1}$
APF V_c	ms⁻¹	…	${7.0}_{- 2.4}^{+ 2.7}$ $7.0_{ - 2.4}^{ + 2.7}$
APF V_r	ms⁻¹	…	$40_{- 14}^{+ 15}$ $40_{ - 14}^{ + 15}$
HARPS-N log ${R^{'}}_{HK}$ ${{\rm{R'}}_{{\rm{HK}}}}$ offset		…	$- {4.4792}_{- 0.0079}^{+ 0.0078}$ $- 4.4792_{ - 0.0079}^{ + 0.0078}$
Uncorrelated HARPS-N log ${R^{'}}_{HK}$ ${{\rm{R'}}_{{\rm{HK}}}}$ jitter		…	${0.008666}_{- 0.00063}^{+ 0.00067}$ $0.008666_{ - 0.00063}^{ + 0.00067}$
HARPS-N L 1_c		…	${0.0331}_{- 0.0038}^{+ 0.0046}$ $0.0331_{ - 0.0038}^{ + 0.0046}$
HIRES log ${R^{'}}_{HK}$ ${{\rm{R'}}_{{\rm{HK}}}}$ offset		…	$- {4.4879}_{- 0.0075}^{+ 0.0075}$ $- 4.4879_{ - 0.0075}^{ + 0.0075}$
Uncorrelated HIRES log ${R^{'}}_{HK}$ ${{\rm{R'}}_{{\rm{HK}}}}$ jitter		…	${0.00693}_{- 0.00066}^{+ 0.00071}$ $0.00693_{ - 0.00066}^{ + 0.00071}$
HIRES L1c		…	${0.0318}_{- 0.0037}^{+ 0.0044}$ $0.0318_{ - 0.0037}^{ + 0.0044}$
APF log ${R^{'}}_{HK}$ ${{\rm{R'}}_{{\rm{HK}}}}$ offset		…	$- {4.454}_{- 0.017}^{+ 0.014}$ $- 4.454_{ - 0.017}^{ + 0.014}$
Uncorrelated APF log ${R^{'}}_{HK}$ ${{\rm{R'}}_{{\rm{HK}}}}$ jitter		…	${0.0301}_{- 0.0048}^{+ 0.0064}$ $0.0301_{ - 0.0048}^{ + 0.0064}$
APF L1c		…	${0.034}_{- 0.010}^{+ 0.012}$ $0.034_{ - 0.010}^{ + 0.012}$
HARPS-N Hα offset		…	${0.2471}_{- 0.0012}^{+ 0.0012}$ $0.2471_{ - 0.0012}^{ + 0.0012}$
Uncorrelated HARPS-N Ha jitter		…	${0.00192}_{- 0.00012}^{+ 0.0013}$ $0.00192_{ - 0.00012}^{ + 0.0013}$
HARPS-N L2_c		…	${0.00498}_{- 0.00058}^{+ 0.00070}$ $0.00498_{ - 0.00058}^{ + 0.00070}$
HARPS-N BIS offset	ms⁻¹	…	${28.27}_{+ 0.53}^{+ 0.50}$ $28.27_{ + 0.53}^{ + 0.50}$
Uncorrelated HARPS-N BIS jitter	ms⁻¹	…	${3.90}_{- 0.24}^{+ 0.26}$ $3.90_{ - 0.24}^{ + 0.26}$
HARPS-N B_c	ms⁻¹	…	${1.65}_{- 0.37}^{+ 0.42}$ $1.65_{ - 0.37}^{ + 0.42}$
HARPS-N Br	ms⁻¹	…	$- {33.5}_{- 5.4}^{+ 4.6}$ $- 33.5_{ - 5.4}^{ + 4.6}$
Photometric jitter $(σ_{jitter}^{LC})$ $\left( {\sigma _{{\rm{jitter}}}^{{\rm{LC}}}} \right)$	ppm	…	292.5±1.6
Stellar density (ρ_⋆)	ρ_⊙	𝒩 (1.85,0.25)	${1.86}_{- 0.15}^{+ 0.16}$ $1.86_{ - 0.15}^{ + 0.16}$

TOI-1430 b parameters
Orbital Period (P_b)	days	𝒩 (7.43,0.05)	${7.4341325}_{- 0.0000044}^{+ 0.000042}$ $7.4341325_{ - 0.0000044}^{ + 0.000042}$
RV semi-amplitude (K_b)	ms⁻¹	𝓤 (0.01,10)	${1.52}_{- 0.30}^{+ 0.30}$ $1.52_{ - 0.30}^{ + 0.30}$
Impact factor (b_b )		…	${0.435}_{- 0.060}^{+ 0.051}$ $0.435_{ - 0.060}^{ + 0.051}$
Planetary-to-stellar-radius ratio ((R_P,b/R_⋆))	%	…	${2.360}_{- 0.028}^{+ 0.028}$ $2.360_{ - 0.028}^{ + 0.028}$
Mean longitude of the ascending node (Ω_b)	deg	…	${176.584}_{- 0.030}^{+ 0.029}$ $176.584_{ - 0.030}^{ + 0.029}$
Orbital eccentricity (e_b)	deg	…	0 (fixed)
Limb darkening (u₁)		𝒩 (0.47,0.01)	${0.466}_{- 0.010}^{+ 0.010}$ $0.466_{ - 0.010}^{ + 0.010}$
Limb darkening (u₂)		𝒩 (0.14,0.01)	${0.141}_{- 0.010}^{+ 0.010}$ $0.141_{ - 0.010}^{ + 0.010}$
Central time of the first transit (T_0,b)	BJD	𝓤 (2458705,2458706)	${2458705.64614}_{- 0.00059}^{+ 0.00062}$ $2458705.64614_{ - 0.00059}^{ + 0.00062}$
Semi-major-axis-to-stellar-radius ratio ((a_b/ R_⋆))		…	${19.71}_{- 0.54}^{+ 0.55}$ $19.71_{ - 0.54}^{ + 0.55}$
Orbital Semi-major axis (a_b)	au	…	${0.07060}_{- 0.00055}^{+ 0.00054}$ $0.07060_{ - 0.00055}^{ + 0.000054}$
Orbital inclination (i_b)	deg	…	${88.74}_{- 0.19}^{+ 0.20}$ $88.74_{ - 0.19}^{ + 0.20}$
Duration of the transit (T _14,b)	hours	…	${2.673}_{- 0.018}^{+ 0.017}$ $2.673_{ - 0.018}^{ + 0.017}$
Planetary radius (R_P,b)	R_⊕	…	${1.982}_{- 0.069}^{+ 0.072}$ $1.982_{ - 0.069}^{ + 0.072}$
Planetary mass (M_P,b)	M_⊕	…	${4.15}_{- 0.83}^{+ 0.83}$ $4.15_{ - 0.83}^{ + 0.83}$
Planetary density (ρ_b)	ρ_⊕	…	${0.53}_{- 0.12}^{+ 0.12}$ $0.53_{ - 0.12}^{ + 0.12}$

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