GAMMA-RAY TIMING OF REDBACK PSR J2339-0533: HINTS FOR GRAVITATIONAL QUADRUPOLE MOMENT CHANGES

被引：43

作者：

Pletsch, Holger J. ^{[1
,2
]}

Clark, Colin J. ^{[1
,2
]}

机构：

[1] Max Planck Inst Gravitat Phys, Albert Einstein Inst, D-30167 Hannover, Germany

[2] Leibniz Univ Hannover, Inst Gravitationsphys, D-30167 Hannover, Germany

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 807卷 / 01期

关键词：

gamma rays: stars; methods: data analysis; pulsars: individual (PSR J2339-0533); ORBITAL PERIOD MODULATION; FERMI MILLISECOND PULSARS; CLOSE BINARY-SYSTEMS; LARGE-AREA TELESCOPE; OPTICAL COUNTERPARTS; NEUTRON-STAR; COMPANION; VARIABILITY; DISCOVERY; B1957+20;

D O I：

10.1088/0004-637X/807/1/18

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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-orb over time, showing alternating epochs of decrease and increase. We inferred a cyclic modulation of P-orb with an approximate cycle duration of 4.2 yr and a modulation amplitude of Delta P-orb/Delta P-orb = 2.3 x 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.

引用

页数：9

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