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New Observations and Improved Analyses of the Rossiter-McLaughlin Effect

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Measurements of Spin-Orbit Angles for Transiting Systems

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Abstract

In this chapter, we present new observations and analyses of the RM effect. First, we preset new measurements of the RM effect for three systems. The new measurements involve the detections of the RM effect for Neptune-sized exoplanet (HAT-P-11b), and for a multiple transiting system (KOI-94). While the RM measurement for KOI-94 reveals that the host star’s spin axis agrees well with KOI-94.01’s orbital axis, the spin-orbit angles for HAT-P-11 and XO-3 turn out to be non-zero, implying significant spin-orbit misalignments. Those measurements provide a precious opportunity to discuss the evolution history of smaller planets or multiple planetary systems. The second topic is the reanalyses of the previous RM measurements. The previous measurements of the RM effect with the simultaneous reference technique (e.g., ESO/HARPS or OHP/SOPHIE) possibly had systematics arising from a rough modeling of the anomalous radial velocities during a transit, and hence the systematic errors in \(\lambda \) and \(V\sin I_s\) reported in the original papers are more or less overlooked. Based on this context, we report the reanalysis of the observed RVs for selected transiting systems for which the RM effect was previously detected, based on the new analytic formula for the simultaneous reference technique.

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Notes

  1. 1.

    These coefficients should be different from the ones used for the modeling of the RM effect since these represent the limb-darkening coefficients for the Kepler band.

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    Teruyuki Hirano

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Hirano, T. (2014). New Observations and Improved Analyses of the Rossiter-McLaughlin Effect. In: Measurements of Spin-Orbit Angles for Transiting Systems. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54586-6_4

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