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 D.1

Stellar activity with quasiperiodic GP and orbital parameters of TOI-1430 b

Parameter	Unit	Prior	Value
TOI-1430 Stellar activity
Stellar rotational period (P_rot)	days	𝒩(11.9,0.3)	${12.058}_{- 0.082}^{+ 0.084}$ $12.058_{ - 0.082}^{ + 0.084}$
Decay Timescale of activity (P_dec)	days	𝒰(13,1000)	${41.4}_{- 7.8}^{+ 6.6}$ ${41.4_{ - 7.8}^{ + 6.6}}$
Coherence scale (w)	m s⁻¹	…	${0.842}_{- 0.070}^{+ 0.085}$ ${0.842_{ - 0.070}^{ + 0.085}}$
Amplitude of the HARPS-N RV signal		𝒰(0.01,100)	${8.6}_{- 1.2}^{+ 1.5}$ ${8.6_{ - 1.2}^{ + 1.5}}$
HARPS-N RV offset	m s⁻¹	…	$- {27244.9}_{- 2.4}^{+ 2.4}$ ${ - 27244.9_{ - 2.4}^{ + 2.4}}$
Uncorrelated HARPS-N RV jitter	m s⁻¹	…	${2.86}_{- 0.24}^{+ 0.25}$ ${2.86_{ - 0.24}^{ + 0.25}}$
Amplitude of the HIRES RV signal	m s⁻¹	𝒰(0.01,100)	${7.8}_{- 1.2}^{+ 1.5}$ ${7.8_{ - 1.2}^{ + 1.5}}$
HIRES RV offset	m s⁻¹	…	$- {0.7}_{- 2.2}^{+ 2.2}$ ${ - 0.7_{ - 2.2}^{ + 2.2}}$
Uncorrelated HIRES RV jitter	m s⁻¹	…	${2.64}_{- 0.42}^{+ 0.47}$ ${2.64_{ - 0.42}^{ + 0.47}}$
Amplitude of the APF RV signal	m s⁻¹	𝒰(0.01,100)	${7.8}_{- 5.7}^{+ 9.6}$ ${7.8_{ - 5.7}^{ + 9.6}}$
APF RV offset	m s⁻¹	…	$- {0.3}_{- 5.7}^{+ 4.9}$ ${ - 0.3_{ - 5.7}^{ + 4.9}}$
Uncorrelated APF RV jitter	m s⁻¹	…	${7.2}_{- 3.1}^{+ 2.6}$ $7.2_{ - 3.1}^{ + 2.6}$
Amplitude of the HARPS-N log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ signal		…	${0.0254}_{- 0.0026}^{+ 0.0031}$ $0.0254_{ - 0.0026}^{ + 0.0031}$
HARPS-N log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ offset		…	$- {4.4768}_{- 0.0071}^{+ 0.0070}$ $- 4.4768_{ - 0.0071}^{ + 0.0070}$
Uncorrelated HARPS-N log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ jitter		…	${0.00776}_{- 0.00079}^{+ 0.00077}$ $0.00776_{ - 0.00079}^{ + 0.00077}$
Amplitude of the HIRES log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ signal		…	${0.0242}_{- 0.0026}^{+ 0.0031}$ $0.0242_{ - 0.0026}^{ + 0.0031}$
HIRES log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ offset		…	$- {4.44890}_{- 0.0068}^{+ 0.0067}$ $- 4.44890_{ - 0.0068}^{ + 0.0067}$
Uncorrelated HIRES log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ jitter		…	${0.00443}_{- 0.00087}^{+ 0.00083}$ $0.00443_{ - 0.00087}^{ + 0.00068}$
Amplitude of the APF log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ signal		…	${0.030}_{- 0.012}^{+ 0.017}$ $0.030_{ - 0.012}^{ + 0.017}$
APF log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ offset		…	$- {4.427}_{- 0.020}^{+ 0.019}$ $- 4.427_{ - 0.020}^{ + 0.019}$
Uncorrelated APF log $R_{HK}^{'}$ ${\rm{R}}_{{\rm{HK}}}^\prime$ jitter		…	${0.0321}_{- 0.0058}^{+ 0.0078}$ $0.0321_{ - 0.0058}^{ + 0.0078}$
Amplitude of the HARPS-N Hα signal		…	${0.00367}_{- 0.00038}^{+ 0.00045}$ $0.00367_{ - 0.00038}^{ + 0.0045}$
HARPS-N Hα offset		…	${0.2478}_{- 0.0010}^{+ 0.0010}$ $0.2478_{ - 0.0010}^{ + 0.0010}$
Uncorrelated HARPS-N Hα jitter		…	${0.00143}_{- 0.00013}^{+ 0.0012}$ $0.00143_{ - 0.00013}^{ + 0.0012}$
Amplitude of the HARPS-N BIS signal	m s⁻¹	…	${9.6}_{- 1.4}^{+ 1.7}$ $9.6_{ - 1.4}^{ + 1.7}$
HARPS-N BIS offset	m s⁻¹	…	${28.0}_{- 2.7}^{+ 2.7}$ $28.0_{ - 2.7}^{ + 2.7}$
Uncorrelated HARPS-N BIS jitter	m s⁻¹	…	${3.13}_{- 0.21}^{+ 0.23}$ $3.13_{ - 0.21}^{ + 0.23}$
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)	${7.4341325}_{- 0.0000044}^{+ 0.0000042}$ ${7.4341325_{ - 0.0000044}^{ + 0.0000042}}$
RV semi-amplitude (K_b)	m s⁻¹	𝒰(0.01,10)	${1.63}_{- 0.31}^{+ 0.31}$ ${1.63_{ - 0.31}^{ + 0.31}}$
Orbital eccentricity (e_b)	deg	…	0 (fixed)
Orbital Semi-major axis (a_b)	au	…	${0.07060}_{- 0.00055}^{+ 0.00054}$ ${0.07060_{ - 0.00055}^{ + 0.00054}}$
Planetary mass (M_P,b)	M_⊕	…	${4.47}_{- 0.84}^{+ 0.84}$ ${4.47_{ - 0.84}^{ + 0.84}}$
Planetary density (ρ_b)	ρ_⊕	…	${0.57}_{- 0.13}^{+ 0.13}$ ${0.57_{ - 0.13}^{ + 0.13}}$

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