Polarized QPOs from the INTEGRAL polar IGRJ14536-5522 (=Swift J1453.4-5524)

Stephen B. Potter*, David A. H. Buckley, Darragh O'Donoghue, Encarni Romero-Colmenero, James O'Connor, Piet Fourie, Geoff Evans, Craig Sass, Lisa Crause, Martin Still, O. W. Butters, A. J. Norton, Koji Mukai

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

34 Citations (Scopus)

Abstract

We report optical spectroscopy and high-speed photometry and polarimetry of the INTEGRAL source IGRJ14536-5522 (=Swift J1453.4-5524). The photometry, polarimetry and spectroscopy are modulated on an orbital period of 3.1564(1) h. Orbital circularly polarized modulations are seen from similar to 0 to similar to-18 per cent, unambiguously identifying IGRJ14536-5522 as a polar. The negative circular polarization is seen over similar to 95 per cent of the orbit, which is consistent (as viewed from the Earth) with a single-pole accretor. We estimate some of the system parameters by modelling the polarimetric observations.

Some of the high-speed photometric data show modulations that are consistent with quasi-periodic oscillations (QPOs) on the order of 5-6 min. Furthermore, for the first time, we detect the (5-6) min QPOs in the circular polarimetry. We discuss the possible origins of these QPOs. In addition, we note that the source undergoes frequent changes between different accretion states.

We also include details of HIgh-speed Photo-POlarimeter (HIPPO), a newhigh-speed photopolarimeter, used for some of our observations. This instrument is capable of high-speed, multi-filtered, simultaneous all-Stokes observations. It is therefore ideal for investigating rapidly varying astronomical sources such as magnetic cataclysmic variables.

Original languageEnglish
Pages (from-to)1161-1170
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume402
Issue number2
DOIs
Publication statusPublished - 21 Feb 2010

Keywords

  • accretion, accretion discs
  • methods: analytical
  • techniques: polarimetric
  • binaries: close, novae, cataclysmic variables
  • X-rays: stars
  • CATACLYSMIC VARIABLES
  • AM-HERCULIS
  • X-RAY
  • PERIODIC OSCILLATIONS
  • OPTICAL OBSERVATIONS
  • VV-PUPPIS
  • EF-ERI
  • ACCRETION
  • SPECTROSCOPY
  • POLARIMETRY

Cite this