Transmission spectroscopy and Rossiter-McLaughlin measurements of the young Neptune orbiting AU Mic

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Table 1

Best fit derived values for the DRS+ARoME and SERVAL+PyAstronomy fits, with and without the use of Gaussian processes.

Parameter	Prior	ARoME	PyAstronomy	ARoME+GP	PyAstronomy+GP
λ°
v sin i (km s⁻¹)
ɛ		–	0.72	–	0.39
u_a		0.57	–	0.35	–
u_b		0.20	–	0.16	–
A_GP (m s⁻¹)		–	–	27.11	8.10
τ_GP (days)		–	–	0.025	0.007
RMS Residual (m s⁻¹)	–	6.10	9.78	3.80	3.42
ln Z	–	− 369.76 ± 0.20	− 307.76 ± 0.08	− 326.18 ± 0.11	− 293.21 ± 0.04

Notes. is a uniform prior with lower and upper limits of a and b, is a normal distribution with mean μ and width σ. The T₀ mean reported corresponds to the first transit time for each planet.

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