RX Gru is a pre-main-sequence eclipsing binary with twin components of mass ~1 solar mass each, age ~28 Myr, and a circumbinary companion of minimum mass 89 Mjup in a 23.8-year orbit.
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A derivative-based method estimates mass ratios for overcontact binaries using the time between extrema in the third derivative of light curves, showing agreement with spectroscopic values for most tested systems.
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RX Gru: a short-period pre-main-sequence eclipsing binary with a distant circumbinary companion
RX Gru is a pre-main-sequence eclipsing binary with twin components of mass ~1 solar mass each, age ~28 Myr, and a circumbinary companion of minimum mass 89 Mjup in a 23.8-year orbit.
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Mass ratio estimates for overcontact binaries using the derivatives of light curves
A derivative-based method estimates mass ratios for overcontact binaries using the time between extrema in the third derivative of light curves, showing agreement with spectroscopic values for most tested systems.