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Over a dozen transiting circumbinary planets have been discovered aroundeclipsing binaries. Transit detections are biased towards aligned planet andbinary orbits, and indeed all of the known planets have mutual inclinationsless than $4.5^{\circ}$. One path to discovering circumbinary planets withmisaligned orbits is through eclipse timing variations (ETVs) of non-transitingplanets. Borkovits et al. (2016) discovered ETVs on the 18.6 d binaryKepler-1660AB, indicative of a third body on a $\approx 236$ d period, with amisaligned orbit and a potentially planetary mass. Getley et al. (2017) agreedwith the planetary hypothesis, arguing for a $7.7M_{\rm Jup}$ circumbinaryplanet on an orbit that is highly misaligned by $120^{\circ}$ with respect tothe binary. In this paper, we obtain the first radial velocities of the binary.We combine these with an analysis of not only the ETVs but also the eclipsedepth variations. We confirm the existence of a $239.5$ d circumbinary planet,but with a lower mass of $4.87M_{\rm Jup}$ and a coplanar orbit. The misalignedorbits proposed by previous authors are definitively ruled out by a lack ofeclipse depth variations. Kepler-1660ABb is the first confirmed circumbinaryplanet found using ETVs around a main sequence binary.

A $5M_\text{Jup}$ Non-Transiting Coplanar Circumbinary Planet Around Kepler-1660AB