Confirmation of the hot super-Neptune TOI-672 b with NIRPS and HARPS - Insights into the Neptunian desert around M dwarfs

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Table 2

Stellar parameters and chemical abundances of the host star TOI-672.

Stellar parameters		(Unit)	Value	Source
Physical parameters
Effective temperature	T_eff	(K)	3783 ± 52	Section 3.1.3, Mann et al. (2015)
			3810 ± 33	Section 3.1.1, Jahandar et al. (2024, 2025)
			3751±52	Section 3.1.2, Antoniadis-Karnavas et al. (2020, 2024)
Spectral type			M0V	Pecaut & Mamajek (2013)
Stellar radius	R_*	(R_⊙)	0.54 ± 0.03	Section 3.1.3, Mann et al. (2015); Tayar et al. (2022)
			0.563 ± 0.016	Section 3.1.4, SED fit, derived
Stellar mass	M_*	(M_⊙)	0.54 ± 0.03	Section 3.1.3, Mann et al. (2019); Tayar et al. (2022)
			0.570 ± 0.021	Section 3.1.4, SED fit, Schweitzer et al. (2019)
Surface gravity	log g	(cgs)	4.70 ± 0.03	Section 3.1.3, derived
Bolometric luminosity	L_bol	(L_bol,⊙)	0.056 ± 0.004	Section 3.1.3, derived
			0.04799 ± 0.00022	Section 3.1.4, SED fit
Rotational velocity	v sin i_*	(km s⁻¹)	<3.75	Upper limit based on the width of a NIRPS resolution element
Chromospheric activity index	log R′_HK		$- {4.69}_{- 0.34}^{+ 0.29}$ $Mathematical equation: $-4.69^{+0.29}_{-0.34}$$	Section 3.3, Astudillo-Defru et al. (2017)
Predicted rotation period	P_rot	(days)	$26_{- 9}^{+ 18}$ $Mathematical equation: $26^{+18}_{-9}$$	Section 3.3, Astudillo-Defru et al. (2017)
			$19_{- 6}^{+ 35}$ $Mathematical equation: $19^{+35}_{-6}$$	Section 3.3, Suárez Mascareño et al. (2018)
			~18.5	Section 3.3, ASAS-SN photometry

Chemical abundances
Overall metallicity	[M/H]	(dex)	−0.3 ± 0.1	Section 3.1.1, Jahandar et al. (2024, 2025)
			-0.25 ± 0.05	Section 3.2, Gromek et al. (in prep.)
Alpha enhancement	[α/Fe]		−0.13 ± 0.09	Section 3.2, Gromek et al. (in prep.), Hinkel et al. (2022)
Iron	[Fe/H]		0.09 ± 0.11	Section 3.1.2, Antoniadis-Karnavas et al. (2020, 2024)
			-0.14 ± 0.07	Section 3.2, Gromek et al. (in prep.)
Oxygen	[O/H]		−0.28 ± 0.06
Sodium	[Na/H]		0.17 ± 0.04
Magnesium	[Mg/H]		−0.20 ± 0.12
Aluminium	[Al/H]	⋮	−0.15 ± 0.06
Silicon	[Si/H]		−0.15 ± 0.10
Potassium	[K/H]		0.16 ± 0.09
Calcium	[Ca/H]		0.07 ± 0.04	⋮
Titanium	[Ti/H]		−0.10 ± 0.10
Chromium	[Cr/H]		−0.07 ± 0.04
Manganese	[Mn/H]		0.15 ± 0.07
Nickel	[Ni/H]		−0.01 ± 0.08

Elemental Ratios
Iron to magnesium	Fe/Mg		${0.91}_{- 0.14}^{+ 0.16}$ $Mathematical equation: $0.91^{+0.16}_{-0.14}$$	Section 3.2, Gromek et al. (in prep.)
Magnesium to silicon	Mg/Si		${1.10}_{- 0.23}^{+ 0.29}$ $Mathematical equation: $1.10^{+0.29}_{-0.23}$$
Silicon to oxygen	Si/O		0.09 ± 0.02	⋮

Notes. Methods for deriving parameters are described in full in Section 3. In the circumstance where multiple values are derived for the same parameter, we indicate in bold which value has been adopted.

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