The Rossiter-McLaughlin effect reloaded: Probing the 3D spin-orbit geometry, differential stellar rotation, and the spatially-resolved stellar spectrum of star-planet systems

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Volume 588 (April 2016)

A&A, 588 (2016) A127

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Table 3

MCMC observational results for HD 189733 and the dervied 3D spin-orbit obliquity.

v_eq (km s^-1)	i⋆ (°) ^a	α	λ (°)	c₁ (km s^-1)	c₂ (km s^-1)	BIC	χ ²	ψ (°)


3.25 ± 0.02^b	90^b	0^b	−0.45 ± 0.17	–	–	76.0	69.0	–^b

4.45	92.5	0.28–0.85^c	−0.42	–	–	70.1	56.2	6.8

4.50	92.0	0.30–0.86^c	−0.44 ± 0.21	−0.01	–	71.4	54.0	6.3

4.46	92.3	0.29–0.85^c	−1.7	1.0	−0.95	74.5	53.7	6.9

Notes.

^(a)

i_⋆ is constrained to 0–180°, and values >90° indicate the star’s rotation axis is pointig away from the LOS.

^(b)

Fixed under the assumption of rigid body rotation; note this means the value in the v_eq column for this row corresponds to v_eq sin i_⋆ and that we are unable to determine the 3D obliquity, ψ.

^(c)

We present only the 1σ ranges as α is largely unconstrained by the data; however, we did find α is > 0.1 with 99.2% confidence.

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