Discovery of the orbital period in the supergiant fast X-ray transient IGR J17544-2619

D. J. Clark, A. B. Hill, A. J. Bird, V. A. McBride, S. Scaringi, A. J. Dean

Research output: Contribution to journalLetterpeer-review

35 Scopus citations

Abstract

The supergiant fast X-ray transient (SFXT) system IGR J17544-2619 has displayed many large outbursts in the past and is considered an archetypal example of SFXTs. A search of the INTEGRAL/ISGRI data archive from MJD 52698-54354 has revealed 11 outbursts and timing analysis of the light curve identifies a period of 4.926 ± 0.001 d which we interpret as the orbital period of the system. We find that large outbursts occasionally occur outside of periastron and place an upper limit for the radius of the supergiant of <23 R.

Original languageEnglish
Pages (from-to)L113-L117
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume399
Issue number1
DOIs
StatePublished - Oct 2009

Keywords

  • Gamma-rays: observations
  • X-rays: binaries
  • X-rays: individual: IGR J17544-2619

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