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 3

Best-fit parameters.

Line	Peak position		Contrast c	R_eff	FWHM	Significance	δ_{R_p}/H_eq
	(nm)	(km s⁻¹)	(%)	(Rp)	(nm)	σ
He I	${1083.2969}_{- 0.0042}^{+ 0.0052}$ $1083.2969_{ - 0.0042}^{ + 0.0052}$	$- {8.09}_{- 1.17}^{+ 1.44}$ $- 8.09_{ - 1.17}^{ + 1.44}$	${3.57}_{- 0.50}^{+ 0.51}$ $3.57_{ - 0.50}^{ + 0.51}$	2.33 ± 0.02	${0.084}_{- 0.012}^{+ 0.016}$ $0.084_{ - 0.012}^{ + 0.016}$	6.9	79 ± 9
Hα	${656.2834}_{- 0.0088}^{+ 0.0094}$ $656.2834_{ - 0.0088}^{ + 0.0094}$	${1.94}_{- 4.18}^{+ 4.42}$ $1.94_{ - 4.18}^{ + 4.42}$	${1.39}_{- 0.28}^{+ 0.28}$ $1.39_{ - 0.28}^{ + 0.28}$	1.65 ± 0.11	${0.104}_{- 0.022}^{+ 0.028}$ $0.104_{ - 0.022}^{ + 0.028}$	5.0	39 ± 7
NaDl	${589.5900}_{- 0.0011}^{+ 0.0011}$ $589.5900_{ - 0.0011}^{ + 0.0011}$	$- {0.98}_{- 0.55}^{+ 0.54}$ $- 0.98_{ - 0.55}^{ + 0.54}$	${3.79}_{- 0.47}^{+ 0.50}$ $3.79_{ - 0.47}^{ + 0.50}$	2.38 ± 0.13	${0.021}_{- 0.003}^{+ 0.004}$ $0.021_{ - 0.003}^{ + 0.004}$	7.9	82 ± 12
NaD2	${588.9952}_{- 0.0017}^{+ 0.0017}$ $588.9952_{ - 0.0017}^{ + 0.0017}$	${0.014}_{- 0.82}^{+ 0.85}$ $0.014_{ - 0.82}^{ + 0.85}$	${3.36}_{- 0.44}^{+ 0.46}$ $3.36_{ - 0.44}^{ + 0.46}$	2.28 ± 0.12	${0.028}_{- 0.004}^{+ 0.004}$ $0.028_{ - 0.004}^{ + 0.004}$	7.4	75 ± 11

Notes. From left to right: the investigated spectral line, the peak position (both in air wavelength and velocity respect to the planetary reference frame), the excess of absorption, c, the corresponding effective radius, the FWHM, the significance of the detection, and the ratio between the equivalent height of the atmosphere and the atmospheric scale height.

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