Studies of orbital parameters and pulse profile of the accreting millisecond pulsar XTE J1807-294

Abstract

The accreting millisecond pulsar XTE J1807-294 was observed by XMM-Newton on March 22, 2003 after its discovery on February 21, 2003 by RXTE. The source was detected in its bright phase with an observed average count rate of 33.3 cts/s in the EPIC-pn camera in the 0.5-10 keV energy band (3.7 mCrab). Using the earlier established best-fit orbital period of 40.0741+/-0.0005 minutes from RXTE observations and considering a circular binary orbit as first approximation, we derived a value of 4.8+/-0.1 lt-ms for the projected orbital radius of the binary system and an epoch of the orbital phase of MJD 52720.67415(16). The barycentric mean spin period of the pulsar was derived as 5.2459427+/-0.0000004 ms. The pulsar's spin-pulse profile showed a prominent (1.5 ms FWHM) pulse, with energy and orbital phase dependence in the amplitude and shape. The measured pulsed fraction in four energy bands was found to be 3.1+/-0.2 % (0.5-3.0 keV), 5.4+/-0.4 % (3.0-6.0 keV), 5.1+/-0.7 % (6.0-10.0 keV) and 3.7+/-0.2 % (0.5-10.0 keV), respectively. Studies of spin-profiles with orbital phase and energy showed significant increase in its pulsed fraction during the second observed orbit of the neutron star, gradually declining in the subsequent two orbits, which was associated with sudden but marginal increase in mass accretion. From our investigations of orbital parameters and estimation of other properties of this compact binary system, we conclude that XTE J1807-294 is very likely a candidate for a millisecond radio pulsar.

arXiv comment4 pages, 4 figures, Accepted for publication in Astronomy and Astrophysics letters

References in corpus (10)

• Evolutionary Binary Sequences for Low- and Intermediate-Mass X-ray Binaries
• Discovery of a Second Millisecond Accreting Pulsar: XTE J1751-305
• Discovery of a High-Latitude Accreting Millisecond Pulsar in an Ultracompact Binary
• White Dwarf Donors in Ultracompact Binaries: The Stellar Structure of Finite Entropy Objects
• A Brown Dwarf Companion for the Accreting Millisecond Pulsar SAX J1808.4-3658
• X-ray Bursts from the Accreting Millisecond Pulsar XTE J1814-338
• Theoretical Considerations on the Properties of Accreting Millisecond Pulsars
• XMM-Newton observation of the 5.25 ms transient millisecond pulsar XTE J1807-294 in outburst
• Hot White Dwarf Donors in Ultracompact X-Ray Binaries
• X-ray Spectroscopy of the Accreting Millisecond Pulsar XTE J0929-314 in Outburst

Cited by in corpus (28)

• Thermonuclear burst oscillations
• Surface Emission from Neutron Stars and Implications for the Physics of their Interiors
• Intermittent millisecond X-ray pulsations from the neutron-star X-ray transient SAX J1748.9-2021 in the globular cluster NGC 6440
• INTEGRAL spectroscopy of the accreting millisecond pulsar XTE J1807-294 in outburst
• Hard Spectra of X-Ray Pulsars from INTEGRAL Data
• Accreting Millisecond X-Ray Pulsars
• Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704
• Accretion-powered millisecond pulsars
• Constraints on the Mass and Radius of the Neutron Star XTE J1807-294
• On the timing properties of SAX J1808.4-3658 during its 2015 outburst
• Spin up and phase fluctuations in the timing of the accreting millisecond pulsar XTE J1807-294
• Timing of the accreting millisecond pulsar SAX J1748.9-2021 during its 2015 outburst
• Discovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808
• Secular spin-down of the AMP XTE J1751-305
• The energy dependence of burst oscillations from the accreting millisecond pulsar XTE J1814-338
• The optical counterparts of Accreting Millisecond X-Ray Pulsars during quiescence
• SWIFT J1756.9-2508: spectral and timing properties of its 2018 outburst
• Timing Features of the Accretion--driven Millisecond X-Ray Pulsar XTE J1807--294 in 2003 March Outburst
• Close-in Exoplanets as Candidates of Strange Quark Matter Objects
• Precise Orbital Parameters and Anomalous Phase Variations of the Accretion-powered Millisecond Pulsar XTE J1807-294
• Neutron star parameter constraints for accretion-powered millisecond pulsars from the simulated IXPE data
• The Luminosity and Energy Dependence of Pulse Phase Lags in the Accretion-powered Millisecond Pulsar SAX J1808.4-3658
• What Makes an Accretion-Powered Millisecond Pulsar?
• Timing of the accreting millisecond pulsar IGR J17591-2342: evidence of spin-down during accretion
• Precise determination of orbital parameters in system with slowly drifting phases: application to the case of XTE J1807-294
• On the peculiar long-term orbital evolution of the eclipsing accreting millisecond X-ray pulsar SWIFT J1749.4-2807
• An apparent positive relation between spin and orbital angular momentum in X-ray binaries
• The 2025 outburst of IGR J17511-3057: timing and spectral insights from NICER and NuSTAR