Precise optical timing of PSR J1023+0038, the first millisecond pulsar detected with Aqueye+ in Asiago. (arXiv:1903.08930v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Zampieri_L/0/1/0/all/0/1">Luca Zampieri</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Burtovoi_A/0/1/0/all/0/1">Aleksandr Burtovoi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fiori_M/0/1/0/all/0/1">Michele Fiori</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Naletto_G/0/1/0/all/0/1">Giampiero Naletto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Spolon_A/0/1/0/all/0/1">Alessia Spolon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barbieri_C/0/1/0/all/0/1">Cesare Barbieri</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Papitto_A/0/1/0/all/0/1">Alessandro Papitto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ambrosino_F/0/1/0/all/0/1">Filippo Ambrosino</a>
We report the first detection of an optical millisecond pulsar with the fast
photon counter Aqueye+ in Asiago. This is an independent confirmation of the
detection of millisecond pulsations from PSR J1023+0038 obtained with SiFAP at
the Telescopio Nazionale Galileo. We observed the transitional millisecond
pulsar PSR J1023+0038 with Aqueye+ mounted at the Copernicus telescope in
January 2018. Highly significant pulsations were detected. The rotational
period is in agreement with the value extrapolated from the X-ray ephemeris,
while the time of passage at the ascending node is shifted by $11.55 pm 0.08$
s from the value predicted using the orbital period from the X-rays. An
independent optical timing solution is derived over a baseline of a few days,
that has an accuracy of $sim 0.007$ in pulse phase ($sim 12$ $mu$s in time).
This level of precision is needed to derive an accurate coherent timing
solution for the pulsar and to search for possible phase shifts between the
optical and X-ray pulses using future simultaneous X-ray and optical
observations.
We report the first detection of an optical millisecond pulsar with the fast
photon counter Aqueye+ in Asiago. This is an independent confirmation of the
detection of millisecond pulsations from PSR J1023+0038 obtained with SiFAP at
the Telescopio Nazionale Galileo. We observed the transitional millisecond
pulsar PSR J1023+0038 with Aqueye+ mounted at the Copernicus telescope in
January 2018. Highly significant pulsations were detected. The rotational
period is in agreement with the value extrapolated from the X-ray ephemeris,
while the time of passage at the ascending node is shifted by $11.55 pm 0.08$
s from the value predicted using the orbital period from the X-rays. An
independent optical timing solution is derived over a baseline of a few days,
that has an accuracy of $sim 0.007$ in pulse phase ($sim 12$ $mu$s in time).
This level of precision is needed to derive an accurate coherent timing
solution for the pulsar and to search for possible phase shifts between the
optical and X-ray pulses using future simultaneous X-ray and optical
observations.
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