TASTE - V. A new ground-based investigation of orbital decay in the ultra-hot Jupiter WASP-12b

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Volume 686 (June 2024)

A&A, 686 (2024) A84

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Table 4

WASP-12b orbital parameters derived from PyORBIT Markov chain Monte Carlo analysis.

Parameter	Units	Prior	Posterior value
Fitted parameters
Orbital period (P)	[days]	𝒰 [1.09142090, 0.00000020]	${1.0914210}_{- 0.00000020}^{+ 0.00000019}$ ${1.0914210_{ - 0.00000020}^{ + 0.00000019}}$
Impact parameter (b)	–	𝒰 [0,1 + (R_★/R_p)/2]	${0.424}_{- 0.013}^{+ 0.012}$ ${0.424_{ - 0.013}^{ + 0.012}}$
Quadratic limb darkening term c₁ (R_C filter)	–	𝒰 [0.412, 0.10]	${0.349}_{- 0.029}^{+ 0.029}$ ${0.349_{ - 0.029}^{ + 0.029}}$
Quadratic limb darkening term c₂ (R_C filter)	–	𝒰 [0.148, 0.10]	${0.167}_{- 0.049}^{+ 0.049}$ ${0.167_{ - 0.049}^{ + 0.049}}$
Quadratic limb darkening term c₁ (SDSS.r filter)	–	𝒰 [0.428, 0.10]	${0.369}_{- 0.031}^{+ 0.030}$ ${0.369_{ - 0.031}^{ + 0.030}}$
Quadratic limb darkening term c₂ (SDSS.r filter)	–	𝒰 [0.15, 0.10]	${0.109}_{- 0.051}^{+ 0.053}$ ${0.109_{ - 0.051}^{ + 0.053}}$
Derived parameters
Semimajor axis (a)	[au]	–	${0.0234}_{- 0.0010}^{+ 0.0010}$ ${0.0234_{ - 0.0010}^{ + 0.0010}}$
Inclination (i)	[deg]	–	${81.80}_{- 0.27}^{+ 0.29}$ ${81.80_{ - 0.27}^{ + 0.29}}$
Planet radius (R_p)	[R_J]	–	${1.965}_{- 0.087}^{+ 0.088}$ ${1.965_{ - 0.087}^{ + 0.088}}$
Transit duration (T₁₄)	[days]	–	0.12504 ± 0.00018

Notes. The listed best-fit values and uncertainties are the medians and 15.865th-84.135th percentiles of the posterior distributions, respectively.

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