Two neighbours of the ultra-short-period Earth-sized planet K2-157 b in the warm Neptunian savanna

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Volume 699 (July 2025)

A&A, 699 (2025) A344

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Table B.4

Parameters of K2-157 c and K2-157 d based on the ESPRESSO blind-search analysis described in Sect. 4.2.

Parameter	Priors	Posteriors

Orbital and physical parameters of K2-157 c
Orbital period, P_orb,c (days)	𝒰(0, 400)	${25.968}_{- 0.052}^{+ 0.051}$ $25.968_{ - 0.052}^{ + 0.051}$
Time of mid-transit, T_0,c (JD)	𝒰(2458533, 2458933)	2458557.03 ± 0.36
RV semi-amplitude, K_c (ms^–1)	𝒰(0, 20)	7.10 ± 0.49
Minimum mass, M_p,c sin i (M_⊕)	(derived)	30.4 ± 2.2
Minimum mass, M_p,c sin i (M_J)	(derived)	0.0958 ± 0.0069
Relative orbital separation, a_c/R_★	(derived)	41.3 ± 1.0
Orbit semi-major axis, a_c (au)	(derived)	0.1651 ± 0.0018
Incident flux, F_inc,c (F_⊕)	(derived)	22.62 ± 0.68
Equilibrium temperature [A=0], T_eq,c (K)	(derived)	587 ± 10

Orbital and physical parameters of K2-157 d

Orbital period, P_orb,d (days)	𝒰(0, 400)	${66.62}_{- 0.75}^{+ 0.99}$ $66.62_{ - 0.75}^{ + 0.99}$
Time of mid-transit, T_0,d (JD)	𝒰(2458533, 2458933)	${2458588.9}_{- 2.8}^{+ 2.2}$ $2458588.9_{ - 2.8}^{ + 2.2}$
RV semi-amplitude, K_d (ms^–1)	𝒰(0, 20)	${3.79}_{- 0.48}^{+ 0.49}$ $3.79_{ - 0.48}^{ + 0.49}$
Minimum mass, M_p,d sin i (M_⊕)	(derived)	22.3 ± 2.8
Minimum mass, M_p,d sin i (M_J)	(derived)	0.0701 ± 0.0089
Relative orbital separation, a_d/R_★	(derived)	77.4 ± 2.0
Orbit semi-major axis, a_d (au)	(derived)	0.3093 ± 0.0041
Incident flux, F_inc,d (F_⊕)	(derived)	6.44 ± 0.22
Equilibrium temperature [A=0], T_eq,d (K)	(derived)	429 ± 8

RV jitter and quadratic trend

RV jitter, σ_jit (m s^–1)	𝒰(0, 10)	${1.43}_{- 0.39}^{+ 0.35}$ $1.43_{ - 0.39}^{ + 0.35}$
Systemic velocity, v_sys (ms^–1)	𝒰(43430, 43460)	${43448.00}_{- 0.83}^{+ 0.79}$ $43448.00_{ - 0.83}^{ + 0.79}$
Linear term, γ (ms^–1 day^–1)	𝒰(–0.1, 0.1)	$- {0.0498}_{- 0.0061}^{+ 0.0062}$ $- 0.0498_{ - 0.0061}^{ + 0.0062}$
Quadratic term, δ (ms^–1 day^–2)	𝒰(–0.01, 0.01)	6.5 ± 1.1 × 10^–5

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