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Title: Gamma-ray timing of redback PSR J2339-0533: Hints for gravitational quadrupole moment changes

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1];  [1]
  1. Max-Planck-Institut fur Gravitationsphysik (Albert-Einstein-Institut), Hannover (Germany); Leibniz Univ. Hannover, Hannover (Germany)

Here, we present the results of precision gamma-ray timing measurements of the binary millisecond pulsar PSR J2339–0533, an irradiating system of the "redback" type, using data from the Fermi Large Area Telescope. We describe an optimized analysis method to determine a long-term phase-coherent timing solution spanning more than six years, including a measured eccentricity of the binary orbit and constraints on the proper motion of the system. A major result of this timing analysis is the discovery of an extreme variation of the nominal 4.6 hr orbital period $${P}_{\mathrm{orb}}$$ over time, showing alternating epochs of decrease and increase. We inferred a cyclic modulation of $${P}_{\mathrm{orb}}$$ with an approximate cycle duration of 4.2 yr and a modulation amplitude of $${\rm{\Delta }}{P}_{\mathrm{orb}}/{P}_{\mathrm{orb}}=2.3\times {10}^{-7}$$. Considering different possible physical causes, the observed orbital-period modulation most likely results from a variable gravitational quadrupole moment of the companion star due to cyclic magnetic activity in its convective zone.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1355149
Journal Information:
The Astrophysical Journal (Online), Vol. 807, Issue 1; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (21)

On the timing properties of SAX J1808.4−3658 during its 2015 outburst journal June 2017
A spider timing model: accounting for quadrupole deformations and relativity in close pulsar binaries journal December 2019
Diagnosing pulsar winds in black-widow, redback, and other binary millisecond pulsar systems journal December 2019
High Energy Radiation from Spider Pulsars journal December 2019
Radio Pulse Search and X-Ray Monitoring of SAX J1808.4−3658: What Causes Its Orbital Evolution? journal May 2017
The Optical Counterpart to the Accreting Millisecond X-Ray Pulsar SAX J1748.9-2021 in the Globular Cluster NGC 6440 journal July 2017
Multiwavelength Observations of a New Redback Millisecond Pulsar Candidate: 3FGL J0954.8–3948 journal August 2018
A Dense Companion to the Short-period Millisecond Pulsar Binary PSR J0636+5128 journal August 2018
Pressure Balance and Intrabinary Shock Stability in Rotation-powered-state Redback and Transitional Millisecond Pulsar Binary Systems journal December 2018
Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries journal February 2019
The Synchrotron Emission Pattern of Intrabinary Shocks journal July 2019
Detection and Timing of Gamma-Ray Pulsations from the 707 Hz Pulsar J0952−0607 journal September 2019
A Millisecond Pulsar Discovery in a Survey of Unidentified Fermi γ -Ray Sources with LOFAR journal September 2017
Discovery of Soft X-Ray Pulsations from PSR J1231–1411 using NICER journal June 2019
Detection and Timing of Gamma-Ray Pulsations from the 707 Hz Pulsar J0952-0607 other January 2019
Multiwavelength Observations of the Redback Millisecond Pulsar J1048+2339 text January 2016
On the timing properties of SAX J1808.4-3658 during its 2015 outburst text January 2017
A Dense Companion to the Short-Period Millisecond Pulsar Binary PSR J0636+5128 text January 2018
Pressure Balance and Intrabinary Shock Stability in Rotation-Powered State Redback and Transitional Millisecond Pulsar Binary Systems text January 2018
Optical spectroscopy and demographics of redback millisecond pulsar binaries text January 2018
Discovery of Soft X-ray Pulsations from PSR J1231-1411 using NICER text January 2019

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