# Summary of K2 Program GO4081

Title: Searching for Terrestrial Planets Orbiting Cool Stars and Brown Dwarfs with K2

PI: Demory, Brice-Olivier (University of Cambridge)
CoIs: Laughlin, Gregory P.; Lissauer, Jack J.; Dragomir, Diana; Zsom, Andras; Selsis, Franck; Stamenkovic, Vlada; Gillon, Michael; Payne, Matthew J; Huber, Daniel; de Wit, Julien

We propose to use K2 to conduct a detailed search for Earth-sized planets orbiting the brightest cool stars and brown dwarfs (spectral types from M0 to L8). We have identified 243 suitable targets for campaigns 4 and 5. This population of objects presents several advantages for exoplanet surveys. First, cool stars and brown dwarfs are small and thus result in favorable planet-to-star area ratios. Second, because of their low effective temperature, the inner edge of their habitable zone can be extremely close (down to a few days only). Third, our targets are bright at infrared wavelengths, which will enable detailed follow-up studies. Our program therefore represents a unique opportunity to find a transiting Earth-size exoplanet for which atmospheric features (including biosignatures) could be detected with near-to-come facilities such as JWST. Such an exoplanet has not been discovered yet. As of today, K2 is the only facility that provides the required stability and photometric precision to make this survey successful. This proposal is a continuation of our K2 campaigns 0, 1, 2 and 3 observations.

# Targets requested by this program that have been observed (56)
EPIC ID, RA (J2000) [deg], Dec (J2000) [deg], magnitude, Investigation IDs
210317378, 58.143084, 11.26078, 12.719, GO4002_SC|GO4020_LC|GO4032_LC|GO4060_LC|GO4097_LC|GO4029_LC|GO4002_LC|GO4081_LC|GO4109_LC
210327027, 58.847376, 11.562141, 15.399, GO4036_SC|GO4036_LC|GO4030_LC|GO4081_LC
210340480, 59.802497, 11.952793, 11.579, GO4020_LC|GO4060_LC|GO4011_LC|GO4029_LC|GO4006_LC|GO4054_LC|GO4104_LC|GO4081_LC|GO4109_LC
210360545, 59.704651, 12.506448, 12.952, GO4020_LC|GO4097_LC|GO4011_LC|GO4029_LC|GO4006_LC|GO4054_LC|GO4081_LC
210393283, 56.004181, 13.309548, 12.095, GO4020_LC|GO4060_LC|GO4011_LC|GO4029_LC|GO4006_LC|GO4081_LC|GO4109_LC
210408563, 64.448719, 13.661766, 11.778, GO4020_LC|GO4018_LC|GO4032_LC|GO4060_LC|GO4048_LC|GO4011_LC|GO4029_LC|GO4054_LC|GO4095_LC|GO4064_LC|GO4012_LC|GO4106_LC|GO4104_LC|GO4081_LC|GO4024_LC|GO4109_LC
210434433, 61.978365, 14.216811, 12.135, GO4002_SC|GO4020_LC|GO4060_LC|GO4097_LC|GO4011_LC|GO4029_LC|GO4083_LC|GO4106_LC|GO4002_LC|GO4081_LC|GO4109_LC
210434769, 61.93312, 14.223482, 10.265, GO4020_LC|GO4023_LC|GO4060_LC|GO4083_LC|GO4102_LC|GO4081_LC|GO4109_LC
210434976, 57.753312, 14.22775, 12.656, GO4020_LC|GO4097_LC|GO4029_LC|GO4083_LC|GO4081_LC|GO4109_LC
210439387, 64.83403, 14.316441, 12.038, GO4020_LC|GO4032_LC|GO4060_LC|GO4011_LC|GO4029_LC|GO4006_LC|GO4081_LC|GO4109_LC
210460280, 56.478564, 14.714257, 11.197, GO4002_SC|GO4060_LC|GO4011_LC|GO4029_LC|GO4006_LC|GO4106_LC|GO4102_LC|GO4104_LC|GO4002_LC|GO4081_LC
210466658, 65.129177, 14.831186, 10.449, GO4020_LC|GO4081_LC|GO4109_LC
210486424, 59.775998, 15.180303, 12.257, GO4020_LC|GO4060_LC|GO4097_LC|GO4011_LC|GO4029_LC|GO4006_LC|GO4081_LC|GO4109_LC
210489654, 65.199952, 15.235854, 12.621, GO4002_SC|GO4020_LC|GO4032_LC|GO4097_LC|GO4029_LC|GO4095_LC|GO4002_LC|GO4081_LC|GO4024_LC|GO4109_LC
210497694, 54.2691, 15.374312, 12.295, GO4020_LC|GO4060_LC|GO4011_LC|GO4029_LC|GO4006_LC|GO4106_LC|GO4081_LC
210500368, 54.87103, 15.420167, 11.803, GO4060_LC|GO4011_LC|GO4029_LC|GO4081_LC|GO4109_LC
210500658, 63.665138, 15.424515, 11.403, GO4020_LC|GO4106_LC|GO4104_LC|GO4081_LC|GO4109_LC
210502828, 56.57705, 15.459936, 11.149, GO4020_LC|GO4060_LC|GO4029_LC|GO4033_LC|GO4007_LC|GO4106_LC|GO4104_LC|GO4081_LC
210522262, 61.781358, 15.779381, 16.935, GO4036_LC|GO4057_LC|GO4030_LC|GO4081_LC
210535241, 61.764251, 15.986204, 12.021, GO4020_LC|GO4060_LC|GO4029_LC|GO4106_LC|GO4102_LC|GO4081_LC|GO4109_LC
210579749, 55.938534, 16.667247, 9.982, GO4102_SC|GO4098_SC|GO4020_LC|GO4057_LC|GO4071_LC|GO4060_LC|GO4011_LC|GO4029_LC|GO4072_LC|GO4102_LC|GO4081_LC|GO4098_LC|GO4109_LC
210580056, 55.969017, 16.672025, 9.296, GO4102_SC|GO4098_SC|GO4020_LC|GO4057_LC|GO4071_LC|GO4023_LC|GO4060_LC|GO4029_LC|GO4033_LC|GO4007_LC|GO4072_LC|GO4102_LC|GO4104_LC|GO4081_LC|GO4098_LC|GO4109_LC
210585703, 56.976783, 16.756635, 11.608, GO4020_LC|GO4060_LC|GO4011_LC|GO4029_LC|GO4102_LC|GO4081_LC
210592074, 59.241097, 16.849487, 11.441, GO4020_LC|GO4060_LC|GO4029_LC|GO4033_LC|GO4007_LC|GO4106_LC|GO4104_LC|GO4081_LC|GO4109_LC
210613397, 56.558337, 17.154839, 11.993, GO4020_LC|GO4090_LC|GO4033_LC|GO4007_LC|GO4006_LC|GO4081_LC|GO4109_LC
210651981, 67.119902, 17.695942, 11.247, GO4020_LC|GO4018_LC|GO4032_LC|GO4060_LC|GO4048_LC|GO4011_LC|GO4006_LC|GO4054_LC|GO4095_LC|GO4064_LC|GO4012_LC|GO4104_LC|GO4081_LC|GO4024_LC|GO4109_LC
210693497, 65.664842, 18.269334, 12.135, GO4020_LC|GO4018_LC|GO4032_LC|GO4060_LC|GO4048_LC|GO4011_LC|GO4029_LC|GO4054_LC|GO4095_LC|GO4081_LC|GO4024_LC|GO4109_LC
210707811, 64.460975, 18.475193, 12.806, GO4020_LC|GO4018_LC|GO4048_LC|GO4097_LC|GO4011_LC|GO4029_LC|GO4054_LC|GO4095_LC|GO4081_LC|GO4024_LC|GO4109_LC
210737964, 65.275052, 18.925304, 17.188, GO4046_LC|GO4081_LC|GO4109_LC
210741091, 66.310684, 18.973581, 11.981, GO4020_LC|GO4018_LC|GO4032_LC|GO4060_LC|GO4048_LC|GO4011_LC|GO4029_LC|GO4054_LC|GO4095_LC|GO4104_LC|GO4081_LC|GO4024_LC|GO4109_LC
210757663, 52.925586, 19.226148, 12.101, GO4020_LC|GO4011_LC|GO4081_LC
210774807, 65.456494, 19.485744, 14.062, GO4026_LC|GO4057_LC|GO4032_LC|GO4023_LC|GO4081_LC|GO4024_LC
210778181, 59.816471, 19.538068, 11.151, GO4020_LC|GO4011_LC|GO4106_LC|GO4104_LC|GO4081_LC|GO4109_LC
210879793, 62.28961, 21.077606, 16.968, GO4036_LC|GO4057_LC|GO4030_LC|GO4081_LC
210941195, 59.809121, 22.043849, 13.363, GO4020_LC|GO4018_LC|GO4032_LC|GO4060_LC|GO4048_LC|GO4011_LC|GO4006_LC|GO4054_LC|GO4095_LC|GO4081_LC|GO4024_LC|GO4109_LC
210996505, 56.659972, 22.919779, 9.426, GO4018_LC|GO4032_LC|GO4048_LC|GO4029_LC|GO4090_LC|GO4033_LC|GO4007_LC|GO4086_LC|GO4064_LC|GO4012_LC|GO4081_LC|GO4024_LC
211003775, 52.177733, 23.034775, 18.253, GO4036_LC|GO4030_LC|GO4081_LC
211006744, 59.993931, 23.082105, 13.27, GO4020_LC|GO4060_LC|GO4011_LC|GO4006_LC|GO4081_LC|GO4109_LC
211008819, 63.794298, 23.114437, 10.099, GO4020_LC|GO4032_LC|GO4104_LC|GO4081_LC|GO4109_LC
211029843, 62.678872, 23.444399, 12.707, GO4020_LC|GO4060_LC|GO4011_LC|GO4029_LC|GO4006_LC|GO4081_LC|GO4109_LC
211036776, 62.16742, 23.557149, 12.804, GO4020_LC|GO4018_LC|GO4032_LC|GO4060_LC|GO4048_LC|GO4029_LC|GO4054_LC|GO4095_LC|GO4081_LC|GO4024_LC|GO4109_LC
211043042, 57.01939, 23.658443, 17.992, GO4057_LC|GO4081_LC
211046195, 53.758697, 23.709892, 14.792, GO4036_SC|GO4036_LC|GO4057_LC|GO4011_LC|GO4081_LC
211048942, 57.856482, 23.755932, 17.626, GO4026_LC|GO4081_LC|GO4024_LC
211058117, 56.421937, 23.902765, 16.873, GO4057_LC|GO4081_LC
211063108, 56.289344, 23.979172, 17.05, GO4057_LC|GO4081_LC|GO4109_LC
211069628, 56.608667, 24.086025, 16.62, GO4057_LC|GO4081_LC
211088076, 56.824686, 24.375475, 17.83, GO4026_LC|GO4036_LC|GO4081_LC|GO4024_LC
211089068, 56.825255, 24.390769, 12.29, GO4020_LC|GO4018_LC|GO4032_LC|GO4060_LC|GO4048_LC|GO4091_LC|GO4106_LC|GO4081_LC|GO4024_LC
211096282, 55.91787, 24.503166, 17.876, GO4026_LC|GO4036_LC|GO4081_LC|GO4024_LC
211102808, 56.91254, 24.606293, 17.353, GO4026_LC|GO4081_LC|GO4024_LC
211102810, 57.312981, 24.606302, 17.015, GO4026_LC|GO4081_LC|GO4024_LC
211107998, 60.60176, 24.690113, 13.019, GO4020_LC|GO4060_LC|GO4011_LC|GO4081_LC|GO4109_LC
211110493, 55.750676, 24.731255, 18.53, GO4026_LC|GO4081_LC|GO4024_LC
211111803, 59.391377, 24.752967, 11.967, GO4020_LC|GO4011_LC|GO4006_LC|GO4054_LC|GO4106_LC|GO4081_LC|GO4109_LC
211183696, 59.973831, 26.089796, 11.556, GO4029_LC|GO4081_LC