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 6

Planetary parameters for TOI-4552 b.

Parameter	TOI-4552 b
Orbital period, P_orb (days)	0.30110032 ± 0.00000014
Time of conjunction, t_c (BJD)	2459361.88587913 ± 0.00024681
Planet radius, R_p (R_⊕)	1.11 ± 0.04
Planet mass, M_p (M_⊕)	1.83 ± 0.47
Planet bulk density, ρ_p (g cm⁻³)	7.74 ± 2.14
RV semi-amplitude, K_p (m s⁻¹)	${4.32}_{- 1.08}^{+ 1.04}$ $Mathematical equation: $4.32^{+1.04}_{-1.08}$$
Orbital inclination, i (°)	${87.77}_{- 1.90}^{+ 1.94}$ $Mathematical equation: $87.77^{+1.94} _{-1.90}$$
Scaled planetary radius, R_p/R_*	${0.0352}_{- 0.0009}^{+ 0.0009}$ $Mathematical equation: $0.0352^{+0.0009}_{-0.0009}$$
Impact parameter, b	${0.16}_{- 0.11}^{+ 0.12}$ $Mathematical equation: $0.16^{+0.12} _{-0.11}$$
Semi-major axis, a (AU)	0.0056255 ± 0.0000003
Eccentricity, e	0 (fixed)
Argument of periastron, ω (deg)	90 (fixed)
Insolation, S_p (S_⊕ )	263 ± 40
Equilibrium temperature^(γ), T_eq (K)	1122 ± 10
ESM $_{7.5 μ m}^{(γ)}$ $Mathematical equation: $^{(\gamma)}_{7.5\mu m}$$	19.5
Dayside temperature^(ζ) T_day (K)	1434 ± 10
Core mass fraction, CMF	${0.55}_{- 0.24}^{+ 0.17}$ $Mathematical equation: $0.55^{+0.17}_{-0.24}$$

Notes. ^(γ)Equilibrium temperature and Emission Spectroscopic Metric (ESM) are calculated as in Kempton et al. (2018), ^(ζ) dayside temperature is computed using Equation (8) in Morris et al. (2022) assuming a bond albedo of A_B =0 and heat distribution factor f = 2/3.

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