# Summary of K2 Program GO12007

Title: Search for rotational modulation in precise photometry of white dwarf stars

PI: Kawaler, Steven (Iowa State University)
CoIs: 

This program will use very sensitive photometric observations of known white dwarfs by K2 during Campaigns 12, and 13 to search for rotational modulation of the flux from white dwarf stars.  These photometric variations can be caused by processes such as magnetic phenomena (such as starspots and plages) or large-scale granulation caused by convection. On the expected white dwarf rotation periods (about 1 day, generalizing from nonradially pulsating white dwarfs), the low amplitude of the expected variations renders them extremely difficult to detect using ground-based photometry. Measurement of rotation modulation (or even upper limits to photometric amplitude variations) will further exploit those data to teach us about magnetic fields and other processes in these stars that are otherwise inaccessible observationally.  

These new targets will build on results from observations in earlier K2 campaigns, allowing a statistically meaningful assessment of white dwarf rotation as an indicator of angular momentum transport during earlier phases of evolution.

In the nonradially pulsating white dwarfs, we can independently measure the rotation rate, providing a test of asteroseismic rotation periods.

# Targets requested by this program that have been observed (31)
EPIC ID, RA (J2000) [deg], Dec (J2000) [deg], magnitude, Investigation IDs
206437239, 343.947637, -6.014018, 15.126, GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12037_SC|GO12040_SC
245955120, 354.425848, -10.695595, 17.376, GO12027_LC|GO12007_LC|GO12040_LC
245970451, 356.300941, -10.267382, 17.813, GO12027_LC|GO12007_LC|GO12040_LC
245988152, 355.492701, -9.787958, 17.726, GO12027_LC|GO12002_LC|GO12007_LC
245995295, 351.476502, -9.606235, 17.806, GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12037_SC
246002141, 351.03554, -9.430223, 17.712, GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12037_SC
246032115, 345.729261, -8.668247, 16.763, GO12027_LC|GO12007_LC|GO12040_LC
246032223, 357.041717, -8.665325, 17.268, GO12002_LC|GO12007_LC|GO12040_LC
246049962, 346.095891, -8.256515, 18.034, GO12027_LC|GO12007_LC|GO12040_LC
246057757, 358.36573, -8.07757, 18.101, GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12903_LC
246074853, 354.711392, -7.688892, 13.34, GO12037_LC|GO12027_LC|GO12039_LC|GO12007_LC|GO12040_LC|GO12902_LC|GO12903_LC|GO12037_SC|GO12007_SC|GO12040_SC
246103334, 345.148469, -7.069209, 9.588, GO12019_LC|GO12052_LC|GO12037_LC|GO12002_LC|GO12007_LC|GO12040_LC|GO12904_LC|GO12037_SC
246105313, 346.079541, -7.024085, 17.121, GO12037_LC|GO12027_LC|GO12007_LC|GO12014_LC|GO12037_SC
246127340, 348.604902, -6.546574, 15.316, GO12037_LC|GO12039_LC|GO12007_LC|GO12037_SC
246142860, 349.789873, -6.213341, 17.826, GO12037_LC|GO12039_LC|GO12007_LC|GO12040_LC|GO12037_SC
246215654, 353.974574, -4.70393, 15.779, GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12903_LC|GO12037_SC|GO12040_SC
246308959, 358.134604, -2.885903, 17.048, GO12027_LC|GO12007_LC|GO12040_LC|GO12040_SC
246414917, 347.33734, -0.534031, 18.476, GO12007_LC
246485489, 350.994526, 1.67408, 14.122, GO12027_LC|GO12044_LC|GO12007_LC|GO12040_LC
251455484, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12037_SC|GO12007_SC|GO12040_SC
251455486, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12037_SC
251455487, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12040_SC
251455488, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC
251455489, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12037_SC
251455490, , , , GO12027_LC|GO12007_LC|GO12040_LC
251455491, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12037_SC
251455492, , , , GO12037_LC|GO12007_LC|GO12040_LC|GO12037_SC
251455493, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC|GO12037_SC
251455494, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC
251455495, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC
251455496, , , , GO12037_LC|GO12027_LC|GO12007_LC|GO12040_LC