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Isolated spinning neutron stars, asymmetric with respect to their rotationaxis, are expected to be sources of continuous gravitational waves. The mostsensitive searches for these sources are based on accurate matched filteringtechniques, that assume the continuous wave to be phase-locked with the pulsarbeamed emission. While matched filtering maximizes the search sensitivity, asignificant signal-to-noise ratio loss will happen in case of a mismatchbetween the assumed and the true signal phase evolution. Narrow-band algorithmsallow for a small mismatch in the frequency and spin-down values of the pulsarwhile integrating coherently the entire data set. In this paper we describe anarrow-band search using LIGO O2 data for the continuous wave emission of 33pulsars. No evidence for a continuous wave signal has been found andupper-limits on the gravitational wave amplitude, over the analyzed frequencyand spin-down volume, have been computed for each of the targets. In thissearch we have surpassed the spin-down limit for some of the pulsars alreadypresent in the O1 LIGO narrow-band search, such as J1400\textminus6325J1813\textminus1246, J1833\textminus1034, J1952+3252, and for new targets suchas J0940\textminus5428 and J1747\textminus2809. For J1400\textminus6325,J1833\textminus1034 and J1747\textminus2809 this is the first time thespin-down limit is surpassed.

Narrow-band search for gravitational waves from known pulsars using the second LIGO observing run