# Summary of K2 Program GO15016

Title: K2 Observations of Variable White Dwarfs in Fields 14, 15 and 16

PI: Hermes, James J (University Of North Carolina, Chapel Hill)
CoIs: Winget, D. E.; Dunlap, Bart H; Clemens, Chris; Gentile Fusillo, Nicola; Kawaler, Steven; Gaensicke, Boris Teddy; Dennihy, Erik; Bell, Keaton; Raddi, Roberto; Montgomery, Mike; Fuchs, Josh

We propose observations of variable white dwarfs in Fields 14-16 of the K2 mission. We request short-cadence observations of known and high-probability pulsating white dwarfs, since the pulsation periods span 100-1400 s. These K2 pulsating white dwarfs will provide unprecedented insight into the interiors of evolved stellar remnants with a sample size large enough to measure the distribution of both hydrogen and helium-layer masses of these evolved objects, as well as directly constraining the efficiency of convection. Additionally, we propose long-cadence observations of hundreds of known and candidate white dwarfs, many of which are known to be magnetic, in close binaries, or harbor remnant planetary systems.

Overall, our program will more than quadruple the number of rotation rates measured for white dwarfs, putting strong constraints on the evolution of angular momentum in the final stages of stellar evolution. We will also characterize the orbital periods of many new post-common-envelope binaries (close WD+dM), informing Type Ia supernova population synthesis models. The proposed observations will provide the capstone for our legacy dataset of white dwarf variability with K2, which will revolutionize our understanding of stellar remnants for the next decade.

# Targets requested by this program that have been observed (92)
EPIC ID, RA (J2000) [deg], Dec (J2000) [deg], magnitude, Investigation IDs
204102719, 241.070815, -23.65612, 18.218, GO15016_LC|GO15016_SC
204919142, 237.779192, -20.267127, 18.1, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
249251294, 229.980614, -25.006817, 18.241, GO15016_LC|GO15066_LC|GO15019_LC|GO15049_LC|GO15016_SC|GO15066_SC|GO15019_SC|GO15049_SC
249350659, 234.146466, -23.707607, 18.415, GO15016_LC
249548325, 237.193436, -21.134699, 13.469, GO15016_LC|GO15016_SC
249573959, 234.132615, -20.822754, 18.016, GO15016_LC
249579776, 236.124142, -20.750875, 17.906, GO15016_LC|GO15016_SC
249581565, 234.244693, -20.729034, 18.835, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
249591837, 235.795476, -20.603908, 18.781, GO15016_LC
249598573, 236.763352, -20.521578, 18.77, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
249600039, 236.547648, -20.503513, 16.439, GO15016_LC|GO15046_LC|GO15062_LC|GO15903_LC|GO15016_SC|GO15062_SC
249605620, 235.423694, -20.435136, 18.381, GO15016_LC
249624478, 236.465191, -20.201019, 17.361, GO15016_LC|GO15016_SC
249628409, 236.913963, -20.150927, 18.811, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
249660366, 231.201575, -19.748229, 15.068, GO15016_LC
249670517, 226.740763, -19.614613, 18.104, GO15016_LC
249676657, 232.672179, -19.536051, 18.217, GO15016_LC|GO15903_LC
249694616, 237.458288, -19.300562, 18.358, GO15016_LC|GO15016_SC
249701196, 237.457654, -19.215008, 18.26, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
249708253, 237.707013, -19.12175, 18.505, GO15016_LC
249781167, 237.541313, -18.147758, 15.793, GO15016_LC|GO15016_SC
249837266, 236.604885, -17.416943, 17.3, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
249842752, 232.636086, -17.346298, 16.501, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
249862817, 236.893304, -17.094694, 18.05, GO15016_LC|GO15051_LC|GO15089_LC|GO15080_LC|GO15016_SC|GO15051_SC|GO15080_SC
249885753, 237.3072, -16.812378, 18.722, GO15016_LC|GO15046_LC|GO15062_LC|GO15902_LC|GO15062_SC|GO15902_SC
249899334, 237.866479, -16.64752, 17.297, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
249899685, 237.806611, -16.643097, 18.54, GO15016_LC
249900134, 237.21562, -16.637342, 17.135, GO15016_LC
249901196, 229.646235, -16.624479, 16.123, GO15016_LC|GO15046_LC|GO15016_SC
249926034, 236.414049, -16.332146, 15.078, GO15016_LC
249931070, 237.201886, -16.273431, 18.425, GO15016_LC|GO15062_LC|GO15902_LC|GO15062_SC|GO15902_SC
249953838, 231.290186, -16.007179, 17.213, GO15016_LC
250000138, 233.332395, -15.462493, 17.986, GO15016_LC
250004497, 235.6809, -15.412215, 17.851, GO15016_LC
250015239, 231.529307, -15.287337, 18.591, GO15016_LC
250024411, 231.700682, -15.183416, 18.125, GO15016_LC|GO15016_SC
250076674, 230.101024, -14.570483, 18.245, GO15016_LC
250083298, 230.78483, -14.491302, 17.344, GO15016_LC|GO15089_LC|GO15080_LC|GO15016_SC|GO15080_SC
250085514, 231.586147, -14.463991, 18.108, GO15016_LC|GO15016_SC
250085524, 230.029615, -14.463895, 17.576, GO15016_LC
250101795, 232.847655, -14.262889, 15.28, GO15016_LC
250105131, 233.971134, -14.220069, 13.678, GO15016_LC|GO15066_LC|GO15090_LC|GO15019_LC|GO15099_LC|GO15049_LC|GO15032_LC|GO15065_LC|GO15016_SC|GO15066_SC|GO15090_SC|GO15019_SC|GO15049_SC
250113938, 234.603327, -14.106198, 18.701, GO15016_LC
250120520, 233.359636, -14.019874, 17.904, GO15016_LC|GO15016_SC
250120527, 232.786465, -14.019785, 18.235, GO15016_LC
250126593, 235.502765, -13.937082, 15.236, GO15016_LC|GO15041_LC|GO15005_LC|GO15065_LC
250131107, 231.718226, -13.875788, 18.411, GO15016_LC
250151928, 232.815696, -13.581462, 17.902, GO15016_LC|GO15046_LC|GO15062_LC|GO15062_SC
250152017, 231.284507, -13.580307, 14.787, GO15016_LC|GO15016_SC
250161682, 232.426611, -13.439768, 18.704, GO15016_LC
250163946, 231.78504, -13.404922, 15.806, GO15016_LC|GO15065_LC
250168085, 233.811939, -13.340701, 18.342, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
250170124, 231.694386, -13.308581, 17.975, GO15016_LC|GO15046_LC|GO15062_LC|GO15062_SC
250175227, 232.847013, -13.231509, 17.631, GO15016_LC
251668141, 227.318945, -19.42781, 17.9, GO15016_LC|GO15016_SC
251668142, 231.68584, -15.098288, 17.3, GO15016_LC|GO15016_SC
251668143, 226.791679, -18.962215, 18.3, GO15016_LC|GO15016_SC
251668144, 229.701221, -14.916099, 18.9, GO15016_LC|GO15016_SC
251668145, 233.027152, -19.975372, 17.6, GO15016_LC|GO15016_SC
251668146, 229.366861, -19.75853, 18.6, GO15016_LC|GO15016_SC
251668147, 233.130982, -14.550798, 18.7, GO15016_LC|GO15016_SC
251668148, 235.9124, -15.4617, 19.0, GO15016_LC|GO15046_LC|GO15062_LC|GO15016_SC|GO15062_SC
251668149, 232.46186, -15.194222, 17.835, GO15016_LC|GO15016_SC
251668150, 229.600275, -18.965921, 18.562, GO15016_LC|GO15016_SC
251668151, 232.589291, -15.428174, 18.744, GO15016_LC|GO15016_SC
251668152, 230.286238, -14.623309, 18.955, GO15016_LC|GO15016_SC
251668154, 229.825633, -19.176998, 18.049, GO15016_LC
251668155, 227.295473, -19.576376, 18.178, GO15016_LC
251668156, 230.386824, -15.043323, 18.21, GO15016_LC
251668157, 231.0044, -21.142, 18.309, GO15016_LC
251668158, 227.236984, -19.635442, 18.377, GO15016_LC
251668159, 233.9944, -25.3383, 18.404, GO15016_LC
251668160, 231.087044, -16.003793, 18.483, GO15016_LC
251668161, 231.7768, -22.048, 18.534, GO15016_LC
251668162, 227.240513, -19.79528, 18.598, GO15016_LC
251668163, 228.362357, -19.560834, 18.604, GO15016_LC
251668164, 232.350963, -18.960993, 18.626, GO15016_LC
251668165, 228.404125, -19.221133, 18.634, GO15016_LC
251668166, 228.079541, -19.129623, 18.666, GO15016_LC
251668167, 230.69974, -19.071154, 18.692, GO15016_LC
251668168, 229.852768, -15.094301, 18.726, GO15016_LC
251668169, 226.334447, -19.943873, 18.756, GO15016_LC
251668170, 227.751331, -19.533665, 18.766, GO15016_LC
251668171, 232.877284, -14.949972, 18.808, GO15016_LC|GO15902_LC|GO15902_SC
251668172, 229.830265, -15.160571, 18.826, GO15016_LC
251668173, 228.687071, -18.972322, 18.872, GO15016_LC
251668174, 231.459511, -15.513795, 18.88, GO15016_LC
251668175, 230.601969, -16.005031, 18.9, GO15016_LC
251668176, 233.131506, -19.287875, 18.906, GO15016_LC
251668177, 231.082106, -15.297638, 19.085, GO15016_LC
251668178, 237.4088, -20.45241, 19.129, GO15016_LC|GO15046_LC|GO15062_LC|GO15062_SC
251668179, 228.0344, -22.1531, 19.198, GO15016_LC