The Pan-STARRS1 survey has obtained multi-epoch imaging in five bands ( Pan-STARRS1 g _ { P 1 } , r _ { P 1 } , i _ { P 1 } , z _ { P 1 } , and y _ { P 1 } ) on twelve “ Medium Deep Fields ” , each of which spans a 3.3 degree circle .
For the period between Apr 2009 and Apr 2011 these fields were observed 50–200 times .
Using a reduced proper motion diagram , we have extracted a list of 47 white dwarf ( WD ) candidates whose Pan-STARRS1 astrometry indicates a non-zero proper motion at the 6 \sigma level , with a typical 1 \sigma proper motion uncertainty of 10 mas/yr .
We also used astrometry from SDSS ( when available ) and USNO-B to assess our proper motion fits .
None of the WD candidates exhibits evidence of statistically significant parallaxes , with a typical 1 \sigma uncertainty of 8 mas .
Twelve of these candidates are known WDs , including the high proper motion ( 1.7 \arcsec yr ^ { -1 } ) WD LHS 291 .
We confirm three more objects as WDs through optical spectroscopy .
Based on the Pan-STARRS1 colors , ten of the stars are likely to be cool WDs with 4170 K < T _ { eff } < 5000 K and cooling ages < 9 Gyr .
We classify these objects as likely thick disk WDs based on their kinematics .
Our current sample represents only a small fraction of the Pan-STARRS1 data .
With continued coverage from the Medium Deep Field Survey and the 3 \pi survey , Pan-STARRS1 should find many more high proper motion WDs that are part of the old thick disk and halo .