Transit-timing variations in the AU Mic system observed with CHEOPS

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Volume 694 (February 2025)

A&A, 694 (2025) A137

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Table 1

Overview of the Allesfitter priors and best-fitting parameters of AU Mic b and c obtained based on the data from 2022 and 2023.

Parameter [unit]	Prior	Value (2022)	Value (2023)
Orbital and planetary parameters: AU Mic b
T_c [BJD_TDB]	𝒰(2459769.0500, 2459769.2000) ⁽¹⁾	2459769.12638 ± 0.00035	${2460149.95497}_{- 0.00086}^{+ 0.0012}$ ${2460149.95497_{ - 0.00086}^{ + 0.0012}}$
	𝒰(2460149.9000, 2460150.0500) ⁽²⁾
P_orb [d]	𝒩(8.4631427, 0.0000005) ⁽³⁾	8.46314271 ± 0.00000050	${8.46314280}_{- 0.00000051}^{+ 0.00000046}$ ${8.46314280_{ - 0.00000051}^{ + 0.00000046}}$
R_p/R_s	𝒰(0.01, 0.1)	${0.04700}_{- 0.00073}^{+ 0.00077}$ ${0.04700_{ - 0.00073}^{ + 0.00077}}$	0.0517 ± 0.0011
(R_p + R_s)/a	𝒰(0.05, 0.06)	${0.0556}_{- 0.0013}^{+ 0.0016}$ ${0.0556_{ - 0.0013}^{ + 0.0016}}$	${0.0578}_{- 0.0016}^{+ 0.0014}$ $0.0578_{ - 0.0016}^{ + 0.0014}$
cos i	𝒰(0.0, 0.0349)	${0.0154}_{- 0.0054}^{+ 0.0047}$ $0.0154_{ - 0.0054}^{ + 0.0047}$	${0.0213}_{- 0.0045}^{+ 0.0035}$ $0.0213_{ - 0.0045}^{ + 0.0035}$

Orbital and planetary parameters: AU Mic c
T_c [BJD_TDB]	𝒰(2459756.6000, 2459756.7500) ⁽¹⁾	${2459756.6677}_{- 0.0052}^{+ 0.0040}$ $2459756.6677_{ - 0.0052}^{ + 0.0040}$	${2460133.8718}_{- 0.0074}^{+ 0.0096}$ $2460133.8718_{ - 0.0074}^{ + 0.0096}$
	𝒰(2460133.8000, 2460133.9500) ⁽²⁾
P_orb [d]	𝒩(18.85882, 0.00005)⁽³⁾	18.858819 ± 0.000049	${18.858827}_{- 0.000052}^{+ 0.000049}$ ${18.858827_{ - 0.000052}^{ + 0.000049}}$
R_p/R_s	𝒰(0.01, 0.1)	0.0354 ± 0.0016	${0.0309}_{- 0.0033}^{+ 0.0028}$ ${0.0309_{ - 0.0033}^{ + 0.0028}}$
(R_p + R_s)/a	𝒰(0.030, 0.036)	0.0338 ± 0.0011	${0.0336}_{- 0.0010}^{+ 0.0011}$ ${0.0336_{ - 0.0010}^{ + 0.0011}}$
cos i	𝒰(0.0, 0.0349)	${0.0200}_{- 0.0037}^{+ 0.0027}$ $0.0200_{ - 0.0037}^{ + 0.0027}$	${0.0214}_{- 0.0074}^{+ 0.0033}$ $0.0214_{ - 0.0074}^{ + 0.0033}$

LD and GP parameters
q₁	𝒩(0.5100, 0.1)	0.485 ± 0.089	0.619 ± 0.085
q₂	𝒩(0.2324, 0.1)	0.279 ± 0.091	0.380 ± 0.092
log σ [log relative flux]	𝒰(–10.0, –6.0)	$- {7.7085}_{- 0.0037}^{+ 0.0039}$ $- 7.7085_{ - 0.0037}^{ + 0.0039}$	–7.7548 ± 0.0044
logS₀	𝒰(–25.0, –15.0)	–21.05 ± 0.12	$- {20.66}_{- 0.11}^{+ 0.11}$ $- 20.66_{ - 0.11}^{ + 0.11}$
log ω₀ [log d^–1]	𝒰(4.0, 8.0)	5.599 ± 0.051	5.898 ± 0.047

Notes. The additional priors were set as follows: T_eff = 3665 ± 31 K, R_s = 0.82 ± 0.02 R_⊙ and M_s = 0.60 ± 0.04 M_⊙ (Donati et al. 2023). ⁽¹⁾The prior for the mid-transit time in 2022. ⁽²⁾The prior for the mid-transit time in 2023. ⁽³⁾Based on Szabó et al. (2022).

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