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#### Detection and timing of gamma-ray pulsations from the 707-Hz pulsar J0952-0607

##### MPS-Authors
/persons/resource/persons231210

Nieder,  L.
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons192124

Singh,  A.
Searching for Continuous Gravitational Waves, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40518

Allen,  B.
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons206570

Eggenstein,  H.-B.
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons20662

Papa,  M. A.
Searching for Continuous Gravitational Waves, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons224715

Steltner,  B.
Searching for Continuous Gravitational Waves, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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##### Fulltext (public)

1905.11352.pdf
(Preprint), 4MB

Nieder_2019_ApJ_883_42.pdf
(Publisher version), 4MB

##### Supplementary Material (public)
There is no public supplementary material available
##### Citation

Nieder, L., Clark, C. J., Bassa, C. G., Wu, J., Singh, A., Donner, J. Y., et al. (2019). Detection and timing of gamma-ray pulsations from the 707-Hz pulsar J0952-0607. The Astrophysical Journal, 883(1): 42. doi:10.3847/1538-4357/ab357e.

Cite as: http://hdl.handle.net/21.11116/0000-0003-CCC8-6
##### Abstract
The LOFAR radio telescope discovered the $707$-Hz binary millisecond pulsar J0952$-$0607 in a targeted radio pulsation search of an unidentified $\textit{Fermi}$ gamma-ray source. This source shows a weak energy flux of $F_\gamma = 2.6 \times 10^{-12}\,\text{erg}\,\text{cm}^{-2}\,\text{s}^{-1}$ in the energy range between $100\,\text{MeV} - 100\,\text{GeV}$. Here we report the detection of pulsed gamma-ray emission from PSR$\,$J0952$-$0607 in a very sensitive gamma-ray pulsation search. The pulsar's rotational, binary and astrometric properties are measured over seven years of $\textit{Fermi}$-Large Area Telescope data. For this we take into account the uncertainty on the shape of the gamma-ray pulse profile. We present an updated radio timing solution now spanning more than two years and show results from optical modeling of the black-widow-type companion based on new multi-band photometric data taken with HiPERCAM on the Gran Telescopio Canarias on La Palma and ULTRACAM on the New Technology Telescope at ESO La Silla. PSR$\,$J0952$-$0607 is now the fastest-spinning pulsar for which the intrinsic spin-down rate has been reliably constrained ($\dot{P}_\text{int} < 4.6 \times 10^{-21}\,\text{s}\,\text{s}^{-1}$). The inferred surface magnetic field strength of $B_\text{surf} \lesssim 8.2 \times 10^{7}\,\text{G}$ is among the ten lowest of all known pulsars. This discovery is another example of an extremely fast spinning black-widow pulsar hiding within an unidentified $\textit{Fermi}$ gamma-ray source. In the future such systems might help to pin down the maximum spin frequency and the minimum surface magnetic field strength of millisecond pulsars.