New ephemerides and detection of transit-timing variations in the K2-138 system using high-precision CHEOPS photometry

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Volume 688 (August 2024)

A&A, 688 (2024) A192

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Table A.1

Priors used for the modeling of the CHEOPS multi-visit, and the resulting best pycheops fit.

Parameters	Prior	Best CHEOPS multi-visit fit
Planet d
Period [days]	5.40479 ± 0.00021	5 40533 ± 0 00043
T_o [BJD-2450000]	${7743.15984}_{- 0.00093}^{0.00095}$ $7743.15984_{ - 0.00093}^{0.00095}$	9110.7186 ± 0.0024
Depth [ppm]	${645.16}_{- 33.02}^{+ 35.05}$ $645.16_{ - 33.02}^{ + 35.05}$	837.98 ± 117.64
Transit duration T₁₄ [h]	${2.71}_{- 0.08}^{+ 0.07}$ $2.71_{ - 0.08}^{ + 0.07}$	2.758 ± 0.094
Impact parameter b	_. ${0.297}_{- 0.170}^{+ 0.145}$ $0.297_{ - 0.170}^{ + 0.145}$	0.388 ± 0.215
Planet e
Period [days]	${8.26146}_{- 0.00021}^{+ 0.00022}$ $8.26146_{ - 0.00021}^{ + 0.00022}$	8.26129 ± 0.00042
To [BJD-2450000]	${7740.64563}_{- 0.00087}^{+ 0.00085}$ $7740.64563_{ - 0.00087}^{ + 0.00085}$	9095.5044 ± 0.0021
Depth [ppm]	${1298.88}_{- 51.90}^{+ 55.34}$ $1298.88_{ - 51.90}^{ + 55.34}$	1285.08 ± 96.49
Transit duration T₁₄ [h]	2.97 ± 0.05	2.994 ± 0.0625
Impact parameter b	${0.474}_{- 0.115}^{+ 0.081}$ $0.474_{ - 0.115}^{ + 0.081}$	0.551 ± 0.111
Planet f
Period [days]	${12.75760}_{- 0.00048}^{+ 0.00051}$ $12.75760_{ - 0.00048}^{ + 0.00051}$	12.7581 ± 0.00137
To [BJD-2450000]	${7738.80226}_{- 0.00092}^{+ 0.00093}$ $7738.80226_{ - 0.00092}^{ + 0.00093}$	9090.9061 ± 0.00571
Depth [ppm]	${939.42}_{- 50.88}^{+ 52.10}$ $939.42_{ - 50.88}^{ + 52.10}$	850.69 ± 126.55
Transit duration T₁₄ [h]	3.2±0.08	3.240 ± 0.112
Impact parameter b	${0.541}_{- 0.109}^{+ 0.073}$ $0.541_{ - 0.109}^{ + 0.073}$	0.525 ± 0.145
Planet g
Period [days]	${41.96822}_{- 0.00774}^{+ 0.00817}$ ${41.96822_{ - 0.00774}^{ + 0.00817}}$	41.96851 ± 0.00786
To [BJD-2450000]	${7773.86006}_{- 0.03522}^{+ 0.01931}$ ${7773.86006_{ - 0.03522}^{ + 0.01931}}$	9116.7492 ± 0.0020
Depth [ppm]	${1023.36}_{- 158.67}^{+ 209.21}$ ${1023.36_{ - 158.67}^{ + 209.21}}$	841.49 ± 189.47
Transit duration T₁₄ [h]	${4.71}_{- 1.63}^{+ 0.79}$ ${4.71_{ - 1.63}^{ + 0.79}}$	4.226 ± 0.027
Impact parameter b	${0.55}_{- 0.365}^{+ 0.319}$ ${0.55_{ - 0.365}^{ + 0.319}}$	0.487 ± 0.231

Notes. As planet 𝑔 only has a single visit, the resulting fit values are therefore from the single visit analysis. These results are solely based on the transits acquired by CHEOPS, the ephemerides from the complete analysis can be found in Table 5.

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