X-Ray and Optical Studies of the Redback System PSR J2129-0429

Hind Al Noori, Mallory Roberts, Rodrigo A. Torres, Maura A. McLaughlin, Peter A. Gentile, Jason W.T. Hessels, Paul S. Ray, Matthew Kerr, Rene P. Breton

Research output: Contribution to journalArticle

Abstract

PSR J2129-0429 is a 7.62 ms eclipsing millisecond pulsar (MSP) with a non-degenerate binary companion star that is likely in an early stage of the recycling process. It has one of the largest companion masses of a so-called "redback" (0.4 M o) and has an unusually high surface magnetic field (1.6 × 109 G) for an MSP. We present here an X-ray and optical study of PSR J2129-0429 using new NuSTAR and LCOGT data of the system in addition to archival Swift and XMM-Newton data. Its X-ray light curve shows strong orbital variation from the intra-binary shock, about five times greater than is typical for other systems, and is clearly and persistently double-peaked. Its X-ray spectrum has a very hard power-law component (Γ = 1.1-1.2) which extends to ∼40 keV and exhibits an efficiency of up to a few percent in the X-ray band. The X-ray spectrum at the second peak of the light curve exhibits strong variability, while the spectrum of the first peak remains constant across observations. The hardness of the spectrum is suggestive of driven magnetic reconnection occurring at the shock. In addition, we observe the companion to be currently optically brightening after a multi-year period where it was dimming. The changes in color suggest that it has been continually cooling, implying that the companion is currently expanding.

Original languageEnglish (US)
Article number89
JournalAstrophysical Journal
Volume861
Issue number2
DOIs
StatePublished - Jul 10 2018

Fingerprint

x rays
pulsars
light curve
shock
dimming
companion stars
binary stars
XMM-Newton telescope
recycling
newton
hardness
power law
magnetic field
cooling
color
orbitals
magnetic fields

Keywords

  • binaries: eclipsing
  • magnetic reconnection
  • pulsars: individual (J2129-0429)
  • X-rays: binaries

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Al Noori, H., Roberts, M., Torres, R. A., McLaughlin, M. A., Gentile, P. A., Hessels, J. W. T., ... Breton, R. P. (2018). X-Ray and Optical Studies of the Redback System PSR J2129-0429. Astrophysical Journal, 861(2), [89]. https://doi.org/10.3847/1538-4357/aac828

X-Ray and Optical Studies of the Redback System PSR J2129-0429. / Al Noori, Hind; Roberts, Mallory; Torres, Rodrigo A.; McLaughlin, Maura A.; Gentile, Peter A.; Hessels, Jason W.T.; Ray, Paul S.; Kerr, Matthew; Breton, Rene P.

In: Astrophysical Journal, Vol. 861, No. 2, 89, 10.07.2018.

Research output: Contribution to journalArticle

Al Noori, H, Roberts, M, Torres, RA, McLaughlin, MA, Gentile, PA, Hessels, JWT, Ray, PS, Kerr, M & Breton, RP 2018, 'X-Ray and Optical Studies of the Redback System PSR J2129-0429', Astrophysical Journal, vol. 861, no. 2, 89. https://doi.org/10.3847/1538-4357/aac828
Al Noori H, Roberts M, Torres RA, McLaughlin MA, Gentile PA, Hessels JWT et al. X-Ray and Optical Studies of the Redback System PSR J2129-0429. Astrophysical Journal. 2018 Jul 10;861(2). 89. https://doi.org/10.3847/1538-4357/aac828
Al Noori, Hind ; Roberts, Mallory ; Torres, Rodrigo A. ; McLaughlin, Maura A. ; Gentile, Peter A. ; Hessels, Jason W.T. ; Ray, Paul S. ; Kerr, Matthew ; Breton, Rene P. / X-Ray and Optical Studies of the Redback System PSR J2129-0429. In: Astrophysical Journal. 2018 ; Vol. 861, No. 2.
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