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  Gamma-ray Timing of Redback PSR J2339-0533: Hints for Gravitational Quadrupole Moment Changes

Pletsch, H., & Clark, C. J. (2015). Gamma-ray Timing of Redback PSR J2339-0533: Hints for Gravitational Quadrupole Moment Changes. The Astrophysical Journal, 807(1): 18. doi:10.1088/0004-637X/807/1/18.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CCE9-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-9975-E
Genre: Journal Article

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 Creators:
Pletsch, Holger1, Author              
Clark, Colin J., Author
Affiliations:
1Pulsar Observation and Data Analysis, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_2253649              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM
 Abstract: We present the results of precision gamma-ray timing measurements of the binary millisecond pulsar PSR J2339$-$0533, an irradiating system of "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-hour orbital period $P_{\rm orb}$ over time, showing alternating epochs of decrease and increase. We inferred a cyclic modulation of $P_{\rm orb}$ with an approximate cycle duration of 4.2 years and a modulation amplitude of $\Delta P_{\rm orb}/ P_{\rm orb} = 2.3 \times 10^{-7}$. 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.

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 Dates: 2015-04-282015
 Publication Status: Published in print
 Pages: 9 pages, 2 figures; to appear in The Astrophysical Journal
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1504.07466
DOI: 10.1088/0004-637X/807/1/18
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 807 (1) Sequence Number: 18 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: /journals/resource/954922828215_3