# Summary of K2 Program GO16010

Title: Asteroseismology of solar-type stars with K2

PI: Lund, Mikkel N (University of Birmingham)
CoIs: Huber, Daniel; Grundahl, Frank; White, Timothy R; Basu, Sarbani; Chaplin, William J; Latham, David W.; Silva Aguirre, Victor; Davies, Guy Rhys; Casagrande, Luca

The aim of the present proposal is to perform an asteroseismic study of bright solar-type stars, including cool main-sequence (MS) dwarfs and sub-giants, residing in the solar neighbourhood. This will be achieved using short-cadence (SC) data collected during K2 Campaigns 14, 15, and 16 (C14-16). This proposal follows similar ones submitted for K2 campaigns 0-13 (PIs Chaplin, Campante, Davies, and Lund).

The information contained in solar-like oscillations allows the internal stellar structure to be constrained to unprecedented levels and allows precise determinations of fundamental stellar properties (mass, radius, age). We seek to exploit the unique opportunity offered by K2 to observe targets for asteroseismology that are typically brighter than those observed during the nominal mission, thus benefiting from better independent constraints (parallaxes, spectroscopy, interferometry). This will make it possible to bring the full potential of asteroseismology to bear to test the physics of stellar interiors. To constrain our analysis further we plan for a spectroscopic follow-up of the proposed targets. By combining the targets observed 
during C14-16 with those from previous K2 campaigns that possess independent constraints we may calibrate seismic scaling relations. This will be essential in seismic galactic archaeology studies, which rely on the application of these relations. Including also targets from the nominal mission, we may study the chemical evolution of the solar neighbourhood and place constraints on the age-metallicity relation of nearby field stars. The results will be used in ongoing investigations that are relevant to this solicitation:

- In C16, M44 and M67 will be re-observed, allowing us to combine new observations with those made during C5, from which solar-like oscillations have been detected for both clusters. M44 is similar to the Hyades for which [1] from C4 observations provided the first ever detections of MS solar-like oscillators in an open cluster. C16 is furthermore forward facing, allowing for contemporaneous observations from the SONG network. Such observations are vital to better understand the relations between observations in photometry and velocity.  

- The targets will further expand the sample of benchmark stars having precise fundamental properties from asteroseismology to different fields in the Galaxy, which will be crucial to calibrate surveys as Gaia and the upcoming GALAH.

We estimate requesting for 30-50 targets per campaign. These should show detectable solar-like oscillations with periods of the order of minutes, hence SC data are required for detecting the oscillations. We will prepare analysis-ready light curves from pixel-data using in-house software - these will be made available to the community via the KASOC portal. We will apply well-tested analysis procedures to the frequency-power spectra of the light curves, providing both estimates of global seismic parameters and individual modes of oscillation. Detailed modelling using state-of-the-art stellar evolution codes will then provide the stellar properties. 

The methodology delineated above has already been successfully applied to the analysis of K2 C1-8 data, for which we reached a very good understanding of the seismic detection yield - from targets awarded in C0-3, [2] showed a detection yield >73%. From C3-5 data we have found that solar-like oscillations can be detected for stars similar to the Sun, with characteristic frequencies around 3100uHz. We have also successfully extracted individual frequencies for these stars, hence enabling detailed seismic modelling [2].

Rerefences: 
[1] Lund et al., 2016a, MNRAS, 463, 1237
[2] Lund et al., 2016b, PASP (in press; http://adsabs.harvard.edu/abs/2016arXiv160807292L)

# Targets requested by this program that have been observed (57)
EPIC ID, RA (J2000) [deg], Dec (J2000) [deg], magnitude, Investigation IDs
211395494, 136.239922, 11.572482, 8.861, GO16009_LC|GO16010_LC|GO16021_LC|GO16025_LC|GO16028_LC|GO16063_LC|GO16068_LC
211403248, 133.109706, 11.691019, 12.306, GO16004_LC|GO16010_LC|GO16031_LC|GO16052_LC|GO16064_LC|GO16010_SC|GO16064_SC
211405262, 132.650557, 11.72169, 12.663, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211407836, 133.047291, 11.760538, 12.745, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211408015, 132.763573, 11.763168, 12.653, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211408138, 132.824965, 11.765055, 12.74, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211408858, 132.900042, 11.775989, 12.615, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211409088, 132.936412, 11.779443, 12.817, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211409376, 132.827865, 11.784082, 12.318, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211409560, 132.784937, 11.786702, 12.267, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211411508, 132.888425, 11.814256, 12.671, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211411553, 133.234386, 11.814967, 12.32, GO16004_LC|GO16010_LC|GO16031_LC|GO16052_LC|GO16064_LC|GO16010_SC|GO16064_SC
211411922, 132.708114, 11.820204, 12.84, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211412839, 132.883939, 11.834337, 12.61, GO16010_LC|GO16010_SC
211414687, 132.914096, 11.862589, 11.955, GO16010_LC|GO16010_SC
211414962, 132.87001, 11.866654, 12.591, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211415273, 132.867925, 11.87153, 12.862, GO16010_LC|GO16010_SC
211415364, 132.742319, 11.872875, 12.762, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211415650, 132.840639, 11.877207, 11.252, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211416749, 132.899075, 11.89297, 12.093, GO16010_LC|GO16010_SC
211417812, 132.750734, 11.908914, 12.69, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211420451, 132.953496, 11.947557, 12.726, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211420502, 137.052346, 11.948203, 7.119, GO16004_LC|GO16010_LC|GO16063_LC
211420549, 132.715955, 11.948852, 12.779, GO16010_LC|GO16010_SC
211421683, 132.897516, 11.965695, 12.688, GO16010_LC|GO16064_LC|GO16010_SC|GO16064_SC
211421954, 132.829055, 11.969724, 12.145, GO16010_LC|GO16010_SC
211424362, 133.520295, 12.005556, 12.014, GO16010_LC|GO16031_LC|GO16052_LC|GO16064_LC|GO16010_SC
211435003, 132.695987, 12.170198, 12.588, GO16004_LC|GO16010_LC|GO16021_LC|GO16031_LC|GO16064_LC|GO16010_SC
211452088, 134.137944, 12.431913, 8.563, GO16009_LC|GO16010_LC|GO16021_LC|GO16028_LC|GO16034_LC|GO16063_LC
211506655, 133.099756, 13.233436, 9.244, GO16004_LC|GO16010_LC|GO16025_LC|GO16037_LC|GO16052_LC|GO16063_LC|GO16068_LC|GO16077_LC|GO16010_SC|GO16037_SC
211593834, 137.474415, 14.456763, 8.168, GO16009_LC|GO16010_LC|GO16021_LC|GO16028_LC|GO16034_LC|GO16063_LC
211636364, 131.332045, 15.046927, 8.351, GO16010_LC|GO16021_LC|GO16028_LC
211658473, 132.756096, 15.350656, 6.232, GO16010_LC|GO16021_LC|GO16028_LC|GO16063_LC|GO16068_LC|GO16081_LC
211811597, 134.191623, 17.48135, 7.48, GO16004_LC|GO16010_LC|GO16025_LC|GO16037_LC|GO16052_LC|GO16063_LC|GO16068_LC|GO16010_SC|GO16037_SC
211826254, 132.653639, 17.689322, 9.221, GO16009_LC|GO16010_LC|GO16021_LC|GO16028_LC|GO16037_LC|GO16063_LC|GO16903_LC|GO16010_SC|GO16903_SC
211902331, 131.638644, 18.760966, 9.332, GO16009_LC|GO16010_LC|GO16021_LC|GO16022_LC|GO16031_LC|GO16060_LC|GO16068_LC
211912407, 130.490908, 18.911724, 9.352, GO16010_LC|GO16021_LC|GO16022_LC|GO16028_LC|GO16031_LC|GO16060_LC|GO16065_LC
211918335, 130.007101, 18.999848, 10.042, GO16001_LC|GO16009_LC|GO16010_LC|GO16021_LC|GO16022_LC|GO16028_LC|GO16031_LC|GO16060_LC|GO16065_LC
211922975, 130.77939, 19.068358, 9.436, GO16010_LC|GO16021_LC|GO16022_LC|GO16028_LC|GO16031_LC|GO16060_LC|GO16065_LC
211923188, 130.280672, 19.071227, 10.014, GO16009_LC|GO16010_LC|GO16021_LC|GO16022_LC|GO16028_LC|GO16031_LC|GO16060_LC|GO16065_LC
211927867, 130.400854, 19.142644, 9.351, GO16010_LC|GO16021_LC|GO16022_LC|GO16028_LC|GO16031_LC|GO16060_LC|GO16068_LC
211931736, 129.991944, 19.201646, 9.518, GO16010_LC|GO16021_LC|GO16022_LC|GO16031_LC|GO16060_LC
211947522, 136.37278, 19.435842, 7.866, GO16010_LC|GO16021_LC|GO16028_LC
211950227, 130.106426, 19.475771, 9.816, GO16009_LC|GO16010_LC|GO16021_LC|GO16022_LC|GO16031_LC|GO16060_LC
211950703, 130.218848, 19.48322, 10.209, GO16010_LC|GO16021_LC|GO16022_LC|GO16031_LC|GO16060_LC|GO16065_LC
211951863, 129.695611, 19.500929, 9.168, GO16010_LC|GO16021_LC|GO16022_LC|GO16031_LC|GO16060_LC
211954550, 130.362412, 19.54247, 9.796, GO16010_LC|GO16021_LC|GO16022_LC|GO16031_LC|GO16060_LC
211964025, 130.086448, 19.686737, 7.605, GO16001_LC|GO16006_LC|GO16010_LC|GO16021_LC|GO16031_LC
211966571, 129.761784, 19.724729, 9.291, GO16009_LC|GO16010_LC|GO16021_LC|GO16022_LC|GO16028_LC|GO16031_LC|GO16060_LC|GO16065_LC|GO16071_LC
211970750, 130.073432, 19.787566, 9.847, GO16009_LC|GO16010_LC|GO16021_LC|GO16022_LC|GO16031_LC|GO16060_LC
212053807, 134.732211, 21.166286, 8.275, GO16009_LC|GO16010_LC|GO16021_LC|GO16025_LC|GO16028_LC|GO16034_LC|GO16037_LC|GO16063_LC|GO16068_LC|GO16010_SC|GO16037_SC
212109644, 133.577945, 22.211262, 7.737, GO16010_LC|GO16021_LC|GO16028_LC|GO16063_LC
212110888, 127.57877, 22.235908, 11.441, GO16009_LC|GO16010_LC|GO16011_LC|GO16013_LC|GO16015_LC|GO16028_LC|GO16077_LC|GO16101_LC|GO16902_LC|GO16010_SC|GO16013_SC|GO16015_SC|GO16101_SC
212178066, 129.689671, 23.685905, 6.793, GO16009_LC|GO16010_LC|GO16021_LC|GO16028_LC|GO16063_LC|GO16068_LC|GO16081_LC
212181661, 135.205252, 23.780045, 8.95, GO16001_LC|GO16009_LC|GO16010_LC|GO16021_LC|GO16028_LC|GO16034_LC|GO16041_LC|GO16063_LC
212194811, 130.761487, 24.137161, 9.84, GO16001_LC|GO16010_LC|GO16020_LC|GO16037_LC|GO16052_LC|GO16063_LC
251341358, 140.946194, 20.364455, 8.272, GO16009_LC|GO16010_LC|GO16021_LC|GO16028_LC|GO16063_LC|GO16077_LC