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We report the detection of periodic variations on the T_eff ~32 000 K DAwhite dwarf star HE 1017-1352. We obtained time series photometry using the 4.1m SOAR telescope on three separate nights for a total of 16.8 h. From thefrequency analysis we found four periods of 605 s, 556 s, 508 s and 869 s withsignificant amplitudes above the 1/1000 false alarm probability detectionlimit. The detected modes are compatible with low harmonic degree g-modenon-radial pulsations with radial order higher than ~ 9. This detectionconfirms the pulsation nature of HE 1017-1352 and thus the existence of the newpulsating class of hot DA white dwarf stars. In addition, we detect a longperiod of 1.52 h, compatible with a rotation period of DA white dwarf stars.

Pulsation in the white dwarf HE 1017-1352: confirmation of the class of hot DAV stars