Discovery of a Warm Jupiter near Resonance with an Exterior sub-Neptune

KOI-315.01 is a sub-Neptune (R_p = 2.02 ± 0.21 R_E) planet candidate with a period of about 36 days that exhibits significant transit time variations (TTVs) of ~2 hours. Follow-up spectroscopic observations from the Tillinghast Reflector Echelle Spectrograph at the Whipple Observatory show a radial velocity (RV) signal due to an interior non-transiting warm Jupiter with a period of about 18 days. This radial velocity signal is consistent with the observed TTVs, as presented in Holczer et al., 2016. We simultaneously fit the RVs and the TTVs in our model, in order to take advantage of all the dynamical information. This is the first system with a warm Jupiter in or near resonance with an exterior sub-Neptune. This system architecture may provide evidence for the in situ formation of warm Jupiters.