TOI-4552 b: A new ultra-short-period rocky world revealed by NIRPS and TESS

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Volume 709 (May 2026)

A&A, 709 (2026) A73

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Table 1

Stellar parameters for TOI-4552.

	TOI-4552	Source
Identifiers
TIC ID	248250955	TICv8.2
2MASS ID	J17385163-4738056	2MASS
Gaia ID	5948579462188230144	Gaia DR3
Astrometric parameters
Right ascension (J2015.5), α	17^h 38^m 51.42^s	Gaia DR3
Declination (J2015.5), δ	−47″ 38′ 13.36″	Gaia DR3
Parallax (mas)	36.556 ± 0.017	Gaia DR3
Distance (pc)	27.38±0.01	Gaia DR3
μRA (mas yr⁻¹)	—134.4654 ± 0.0185	Gaia DR3
μDec (mas yr⁻¹)	−472.5121 ± 0.0118	Gaia DR3
v_sys (km s⁻¹)	−26.2162 ± 0.9744	Gaia DR3
U^(θ) (km s⁻¹)	−44.918 ± 0.923	This work
V^(θ) (km s⁻¹)	−50.718 ± 0.277	This work
W^(θ) (km s⁻¹)	−12.703 ± 0.146	This work
Photometric parameters
TESS (mag)	11.9251 ± 0.0073	TICv8.2
V (mag)	14.44 ± 0.028	TICv8.2
G (mag)	13.2136 ± 0.0004	Gaia DR3
J (mag)	10.256 ± 0.021	2MASS
H (mag)	9.659 ± 0.019	2MASS
K_s (mag)	9.395 ± 0.019	2MASS
Bulk parameters
Spectral type	M4.5V	This work
T_eff (K)	3258 ± 115	This work
R_* (R_⊙)	0.2869 ± 0.0088	This work
M_* (M_⊙)	0.2619 ± 0.0063	This work
P_* (g cm⁻³)	15.803 $_{- 1.302}^{+ 1.057}$ $Mathematical equation: $^{+1.057}_{-1.302}$$	This work
L_* (L_⊙)	0.00836 ± 0.0013	This work
[Fe/H] (dex)	−0.07 ± 0.09	This work
[M/H] (dex)	−0.01 ± 0.07	This work
[α/Fe] (dex)	0.06 ± 0.12	This work
Fe/Mg (mol. frac.)	0.91 $_{- 0.31}^{+ 0.48}$ $Mathematical equation: $^{+0.48}_{-0.31}$$	This work
Mg/Si (mol. frac.)	0.62 $_{- 0.33}^{+ 0.69}$ $Mathematical equation: $^{+0.69}_{-0.33}$$	This work
Si/O (mol. frac.)	0.10 $_{- 0.05}^{+ 0.1}$ $Mathematical equation: $^{+0.1}_{-0.05}$$	This work
log g_* (cms⁻²)	4.940 ± 0.028	This work
Macroturbulance (km s⁻¹)	4 ± 2.25	This work
Microturbulance (km s⁻¹)	0.75 ± 0.5	This work

Notes. Sources: TICv8 (Stassun et al. 2019), 2MASS (Skrutskie et al. 2006), Gaia DR3 (Gaia Collaboration 2023). ^(θ)The values for the galactic space velocities (U, V and W) were calculated using the default function of the BANYAN Σ algorithm (Gagné et al. 2018) using parameters from Gaia DR3. The same algorithm concluded that TOI-4552 is a field star with 99.9% probability.

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