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 2

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

Parameter [unit]	Value (2022)	Value (2023)
Orbital and planetary parameters: AU Mic b
R_s/a	${0.0531}_{- 0.0013}^{+ 0.0016}$ ${0.0531_{ - 0.0013}^{ + 0.0016}}$	${0.0550}_{- 0.0015}^{+ 0.0013}$ ${0.0550_{ - 0.0015}^{ + 0.0013}}$
a/R_s	${18.83}_{- 0.54}^{+ 0.47}$ ${18.83_{ - 0.54}^{ + 0.47}}$	${18.18}_{- 0.42}^{+ 0.51}$ ${18.18_{ - 0.42}^{ + 0.51}}$
R_p/a	${0.002497}_{- 0.000083}^{+ 0.000094}$ ${0.002497_{ - 0.000083}^{ + 0.000094}}$	${0.002843}_{- 0.00011}^{+ 0.000098}$ ${0.002843_{ - 0.00011}^{ + 0.000098}}$
R_p [R_⊕]	4.20 ± 0.12	4.62 ± 0.15
R_p [R_Jup]	0.375 ± 0.011	0.412 ± 0.013
a [R_⊙]	15.42 ± 0.56	${14.92}_{- 0.49}^{+ 0.55}$ ${14.92_{ - 0.49}^{ + 0.55}}$
a [au]	0.0717 ± 0.0026	${0.0694}_{- 0.0023}^{+ 0.0025}$ ${0.0694_{ - 0.0023}^{ + 0.0025}}$
i [deg]	${89.12}_{- 0.27}^{+ 0.31}$ ${89.12_{ - 0.27}^{ + 0.31}}$	${88.78}_{- 0.20}^{+ 0.26}$ ${88.78_{ - 0.20}^{ + 0.26}}$
b	${0.290}_{- 0.098}^{+ 0.077}$ ${0.290_{ - 0.098}^{ + 0.077}}$	${0.386}_{- 0.074}^{+ 0.057}$ ${0.386_{ - 0.074}^{ + 0.057}}$
$T_{14}^{(⋆)} [h]$ ${T_{14}^{( \star )}[{\rm{h}}]}$	${3.457}_{- 0.019}^{+ 0.021}$ ${3.457_{ - 0.019}^{ + 0.021}}$	${3.480}_{- 0.062}^{+ 0.048}$ ${3.480_{ - 0.062}^{ + 0.048}}$
$T_{23}^{(⋆ ⋆)} [h]$ ${T_{23}^{( \star \star )}[{\rm{h}}]}$	${3.118}_{- 0.022}^{+ 0.021}$ ${3.118_{ - 0.022}^{ + 0.021}}$	${3.084}_{- 0.074}^{+ 0.056}$ ${3.084_{ - 0.074}^{ + 0.056}}$
$T_{eq}^{⋄} [K]$ ${T_{{\rm{eq}}}^\diamondsuit [{\rm{K}}]}$	${546.4}_{- 8.1}^{+ 8.9}$ ${546.4_{ - 8.1}^{ + 8.9}}$	${555.7}_{- 8.9}^{+7.9}$ ${555.7_{ - 8.9}^{7.9}}$
$T_{d}^{(‡)} [relative flux]$ $T_{\rm{d}}^{(\ddag )}[{\rm{relativeflux}}]$	0.002633 ± 0.000088	0.00330 ± 0.00011

Orbital and planetary parameters: AU Mic c
R_s/a	${0.0326}_{- 0.0010}^{+ 0.0011}$ ${0.0326_{ - 0.0010}^{ + 0.0011}}$	${0.03260}_{- 0.00098}^{+ 0.0010}$ ${0.03260_{ - 0.00098}^{ + 0.0010}}$
a/R_s	30.7 ± 1.0	30.68 ± 0.96
R_p/a	0.001155 ± 0.000069	${0.00100}_{- 0.00011}^{+ 0.00010}$ $0.00100_{ - 0.00011}^{ + 0.00010}$
R_p [R_⊕]	3.17 ± 0.16	${2.76}_{- 0.29}^{+ 0.26}$ $2.76_{ - 0.29}^{ + 0.26}$
Rp [R_Jup]	0.283 ± 0.014	${0.246}_{- 0.026}^{+ 0.023}$ $0.246_{ - 0.026}^{ + 0.023}$
a [R_⊙]	25.14 ± 1.0	25.14 ± 1.0
a [au]	0.1169 ± 0.0047	0.1169 ± 0.0047
i [deg]	${88.85}_{- 0.16}^{+ 0.21}$ $88.85_{ - 0.16}^{ + 0.21}$	${88.78}_{- 0.19}^{+ 0.43}$ $88.78_{ - 0.19}^{ + 0.43}$
b	${0.615}_{- 0.11}^{+ 0.074}$ $0.615_{ - 0.11}^{ + 0.074}$	${0.658}_{- 0.23}^{+ 0.093}$ $0.658_{ - 0.23}^{ + 0.093}$
$T_{14}^{(⋆)} [h]$ $T_{14}^{( \star )}[{\rm{h}}]$	${3.90}_{- 0.25}^{+ 0.31}$ $3.90_{ - 0.25}^{ + 0.31}$	${3.73}_{- 0.40}^{+ 0.64}$ $3.73_{ - 0.40}^{ + 0.64}$
$T_{23}^{(⋆ ⋆)} [h]$ $T_{23}^{( \star \star )}[{\rm{h}}]$	${3.48}_{- 0.30}^{+ 0.36}$ $3.48_{ - 0.30}^{ + 0.36}$	${3.34}_{- 0.48}^{+ 0.74}$ $3.34_{ - 0.48}^{ + 0.74}$
$T_{eq}^{(⋄)} [K]$ $T_{{\rm{eq}}}^{(\diamondsuit )}[{\rm{K}}]$	428.0 ± 7.8	428.0 ± 7.8
$T_{d}^{(‡)} [relative flux]$ $T_{\rm{d}}^{(\ddag )}[{\rm{relative}}\,{\rm{flux]}}$	0.001376 ± 0.000087	${0.00104}_{- 0.00014}^{+ 0.00012}$ $0.00104_{ - 0.00014}^{ + 0.00012}$

Stellar parameters
u₁	0.39 ± 0.13	0.60 ± 0.15
u₂	${0.30}_{- 0.13}^{+ 0.14}$ $0.30_{ - 0.13}^{ + 0.14}$	0.19 ± 0.14
ρ_s [g cm^–3]	1.65 ± 0.19	${1.56}_{- 0.12}^{+ 0.14}$ $1.56_{ - 0.12}^{ + 0.14}$

Notes. ^(★)Total transit duration between first and fourth contact.^(★★) Full transit duration between second and third contact. ^(◇)Assuming an albedo of 0.3 and uniform heat redistribution. ^(‡)Transit depth.

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