# Summary of K2 Program GO7067

Title: Observing high-priority transit candidates and eclipsing binaries from HATSouth with K2 long-cadence photometry

PI: Bakos, Gaspar Aron (Princeton University)
CoIs: Hartman, Joel D; Mancini, Luigi

We propose to observe 24 stars in campaign 7 of the K2 mission which have been selected as candidate transiting planets based on observations by the HATSouth survey. The transit signals found in the HATSouth light curves for these candidates have periods ranging from 0.6 days to 16.7 days. The candidates have V magnitudes ranging from 12.8 to 16.4. Follow-up spectroscopic observations have been carried out for 15 of these candidates, based on which 8 have been identified as eclipsing binaries and 7 remain active candidates. There are 9 other candidates which remain active, and have not yet received follow-up observations. Two of the candidates have high precision RV observations which vary in phase with the photometric ephemeris and strongly suggest that they are transiting hot Jupiter systems. We are requesting long-cadence observations for all 24 of these objects.

The K2 observations of these stars will serve several purposes: (1) confirming the transit detections for marginal candidates; (2) allowing us to rule out a variety of false positives by detecting secondary eclipses, large amplitude out-of-transit ellipsoidal variations, or differences in depth between even and odd transits; (3) providing high precision light curves to use in determining the properties of confirmed planets; (4) measuring the photometric rotation periods of the candidates; (5) for the 8 objects already found to be eclipsing binaries we will combine the high precision K2 light curves with our RV observations to determine the physical properties of the transiting M dwarf stars in these systems, we will also attempt an independent measure of the component masses through modelling the ellipsoidal and doppler boosting signals.

A similar proposal was previously submitted to follow-up HATNet candidates in K2 campaign 0. These observations allowed us to confirm a new well-characterized transiting planet (HTR220-003; Huang et al. 2015, in preparation) demonstrating the promise of our method.

This proposal is relevant to the NASA goal of finding and characterizing exoplanetary systems.

# Targets requested by this program that have been observed (24)
EPIC ID, RA (J2000) [deg], Dec (J2000) [deg], magnitude, Investigation IDs
214439239, 289.2985229, -26.4893227, 15.467, GO7067_LC
214512594, 288.6398621, -26.3090744, 15.909, GO7067_LC
214652580, 290.2932739, -25.9666157, 14.307, GO7067_LC
214912104, 289.8248291, -25.3558941, 14.276, GO7067_LC
215101303, 289.4114685, -24.9358578, 14.891, GO7067_LC
215234145, 296.2214966, -24.649271, 13.114, GO7030_LC|GO7067_LC
215353525, 294.0773621, -24.3963909, 14.765, GO7067_LC
215358983, 294.4802246, -24.384943, 13.786, GO7067_LC
215474548, 288.8956299, -24.1430073, 15.95, GO7067_LC
215626177, 289.434021, -23.8475742, 12.964, GO7067_LC
215714765, 293.9234619, -23.6784687, 14.386, GO7067_LC
215716837, 290.1205444, -23.6746407, 15.076, GO7067_LC
215816368, 295.9132996, -23.4870014, 15.628, GO7067_LC
215969174, 291.4786987, -23.2027931, 14.3, GO7067_LC
216231580, 295.1570129, -22.7216892, 14.771, GO7067_LC
216442060, 291.0415344, -22.3408909, 12.796, GO7067_LC
216562832, 291.4645691, -22.1251469, 15.818, GO7067_LC
216579956, 288.3367615, -22.0945969, 15.188, GO7067_LC
217149884, 290.6599426, -21.0838795, 14.216, GO7067_LC
217231249, 288.2290344, -20.9394398, 13.838, GO7067_LC
217393088, 289.4391174, -20.6543751, 15.293, GO7067_LC
218131080, 289.2023926, -19.3559074, 12.7, GO7067_LC
218210199, 288.2145996, -19.2131672, 13.848, GO7067_LC
218475491, 290.2160645, -18.7352734, 14.849, GO7067_LC