Thomas Barclay edited Observations, Extractions and Detrending.tex  about 10 years ago

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We collected data on GD\,1212 from 2014\,Jan\,17 to 2014\,Feb\,13 in short-cadence mode (SC), where each exposure is 58.8\,s. After the first 2.6 days, the observations were interrupted for 15.1\,days by a safe-mode event and subsequent engineering fault analysis. The final 9.0-day light curve can be found in Figure~\ref{fig:GD1212lc}. We have removed all points falling more than 4$\sigma$ from the light curve mean, resulting in 2.6- and 9.0-day observations with a duty cycle of more than 98.2\% and 98.9\%, respectively.  In contrast to the primary mission, where only small masks were placed around each star, the data on GD\,1212 were collected using a $50 \times 50$ pixel ``super aperture.'' We expect the aperture size used in two-wheel mode will decrease as confidence in the spacecraft pointing ability increases. The observed pixels were processed through the CAL module of the {\em Kepler} pipeline \citep{2010SPIE.7740E..64Q} to produce target pixel files (TPFs); light curve files were not produced for this commissioning engineering  data. TPF data for all stars observed during this engineering run are available at the MAST Kepler archive\footnote{\url{http://archive.stsci.edu/kepler}}. Our final 9.0-day dataset is nearly continuous and has a formal frequency resolution of 1.29 \muhz. The median noise level in the Fourier transform (FT) near 500 and 1500 \muhz\ for this 9.0-day run is roughly 0.0036\% (36 ppm). For the entire 26.7-day (42.8\% duty cycle) data set on the $K_p=13.3$ mag GD\,1212, the median noise level is roughly 0.0028\% (28 ppm).