The GAPS programme at TNG - LXIII. Photo-evaporating puzzle: Exploring the enigmatic nature of TOI-5398 b’s atmospheric signal

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Volume 692 (December 2024)

A&A, 692 (2024) A77

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Table 1

Stellar and planetary parameters adopted.

Parameters			Reference
Stellar parameters
Stellar mass M_* (M_⊙)	1.146 ± 0.013		Mantovan et al. (2024a)
Stellar radius, R_* (R_⊙)	1.051 ± 0.013		Mantovan et al. (2024a)
Effective temperature, T_eff (K)	6000 ± 75		Mantovan et al. (2024a)
Metallicity, [Fe/H] (dex)	0.09 ± 0.06		Mantovan et al. (2024a)
log g (log₁₀ (cm s⁻²))	4.44 ± 0.10		Mantovan et al. (2024a)
Systemic velocity, v_sys (km s⁻¹)	9.95±0.30		GaiaDR3
v sin i_* (km s ⁻¹)	7.5 ± 0.6		Mantovan et al. (2024a)
Planetary Parameters
	TOI-5398 b	TOI-5398c
Orbital period, P (days)	${10.590547}_{- 0.000011}^{+ 0.000012}$ $10.590547_{ - 0.000011}^{ + 0.000012}$	${4.77271}_{- 0.000014}^{+ 0.000016}$ $4.77271_{ - 0.000014}^{ + 0.000016}$	Mantovan et al. (2024a)
Transit epoch, T₀ (BJD_TDB)	${2459616.49232}_{- 0.00021}^{+ 0.00022}$ $2459616.49232_{ - 0.00021}^{ + 0.00022}$		Mantovan et al. (2024a)
Eccentricity, e	≤0.13	≤0.14	Mantovan et al. (2024a)
Argument of periastron, ω_* (deg)	${92.0}_{- 45.0}^{+ 82.0}$ $92.0_{ - 45.0}^{ + 82.0}$	$172_{- 107}^{+ 79}$ $172_{ - 107}^{ + 79}$	Mantovan et al. (2024a)
Stellar reflex velocity, K_* (m s⁻¹)	15 7 ± 1 5	${4.1}_{- 1.6}^{+ 1.7}$ $4.1_{ - 1.6}^{ + 1.7}$	Mantovan et al. (2024a)
Orbital major semi-axis, a (au)	0.0980 ± 0.0050	0 057 ± 0 003	Mantovan et al. (2024a)
Orbital inclination, i (deg)	${89.21}_{- 0.21}^{+ 0.31}$ $89.21_{ - 0.21}^{ + 0.31}$	≥88.4	Mantovan et al. (2024a)
Planetary mass, M_p (M_jup)	0.185 ± 0.018	0 0345 ± 0 0125	Mantovan et al. (2024a)
Planetary radius, R_p (R_jup)	0.9189 ± 0.0357	0.32 ± 0.02	Mantovan et al. (2024a)
Planetary density, ρ_p (g/cm³)	0.29 ± 0.05	1.50 ± 0.68	Mantovan et al. (2024a)
Impact parameter, b	${0.272}_{- 0.110}^{+ 0.069}$ $0.272_{ - 0.110}^{ + 0.069}$	≤0.34	Mantovan et al. (2024a)
Projected obliquity, λ (deg)	${3.0}_{- 4.2}^{+ 6.8}$ $3.0_{ - 4.2}^{ + 6.8}$		Mantovan et al. (2024b)
Equilibrium temperature, T_eq (K)	947 ± 28	1242 ± 37	Mantovan et al. (2024a)
Planet radial-velocity semi-amplitude, K_p(km s⁻¹)	101.58	132.14	This paper ^(a)

Notes. $^{(a)} K_{p} = \frac{2 π a}{P} \frac{\sin i}{\sqrt{1 - e^{2}}} = {(\frac{2 π G}{P})}^{\frac{1}{3}} \frac{{(M_{⋆} + M_{p})}^{\frac{1}{3}} \sin i}{\sqrt{1 - e^{2}}} .$ ${{\rm{K}}_{\rm{p}}} = {{2\pi a} \over P}{{\sin i} \over {\sqrt {1 - {e^2}} }} = {\left( {{{2\pi G} \over P}} \right)^{{1 \over 3}}}{{{{\left( {{M_ \star } + {M_{\rm{p}}}} \right)}^{{1 \over 3}}}\sin i} \over {\sqrt {1 - {e^2}} }}.$

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