LIGO Document T1900358-v5

Directed search for continuous gravitational waves from a neutron star in LIGO O2 with a hidden Markov model

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T - Technical notes
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Searches for continuous gravitational waves from nonpulsating neutron stars in young supernova remnants are computationally challenging because of rapid stellar braking. Most of the searches to date were conducted using data stretches shorter than ~1 month. The semicoherent search method based on a hidden Markov model tracking scheme provides an economical alternative to the coherent search methods. It can track rapid phase evolution from secular stellar braking and stochastic timing noise torques simultaneously without searching second- and higher-order derivatives of the signal frequency. Here we select one source and conduct a semicoherent search using the whole length of LIGO O2 data.
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