SIMBAD references

2017MNRAS.470..932H - Mon. Not. R. Astron. Soc., 470, 932-939 (2017/September-1)

Rapid rotators revisited: absolute dimensions of KOI-13.


Abstract (from CDS):

We analyse Kepler light-curves of the exoplanet Kepler Object of Interest no. 13b (KOI-13b) transiting its moderately rapidly rotating (gravity-darkened) parent star. A physical model, with minimal ad hoc free parameters, reproduces the time-averaged light-curve at the ∼10 parts per million level. We demonstrate that this Roche-model solution allows the absolute dimensions of the system to be determined from the star's projected equatorial rotation speed, ve sin i*, without any additional assumptions; we find a planetary radius RP = (1.33 ± 0.05) R, stellar polar radius Rp = (1.55 ± 0.06) R, combined mass M* + MP( ≃ M*) = (1.47 ± 0.17) M and distance d ≃ (370 ± 25) pc, where the errors are dominated by uncertainties in relative flux contribution of the visual-binary companion KOI-13B. The implied stellar rotation period is within ∼5 per cent of the non-orbital, 25.43-hr signal found in the Kepler photometry. We show that the model accurately reproduces independent tomographic observations, and yields an offset between orbital and stellar-rotation angular-momentum vectors of 60.25 ± 0.05.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: fundamental parameters - stars: individual: KOI-13 - stars: rotation - stars: rotation

Simbad objects: 10

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