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1 results

  • A peculiar thermonuclear X-ray burst from the transiently accreting neutron star SAX J1810.8–2609

  • N. Degenaar, R. Wijnands
  • Journal:
    Proceedings of the International Astronomical Union / Volume 8 / Issue S291 / August 2012
    Published online by Cambridge University Press:
    20 March 2013, pp. 141-144
    Print publication:
    August 2012
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  • We report on a thermonuclear (type-I) X-ray burst that was detected from the neutron star low-mass X-ray binary SAX J1810.8–2609 in 2007 with Swift. This event was longer (≃20 min) and more energetic (a radiated energy of Eb≃6.5×1039 erg) than other X-ray bursts observed from this source. A possible explanation for the peculiar properties is that the X-ray burst occurred during the early stage of the outburst when the neutron star was relatively cold, which allows for the accumulation of a thicker layer of fuel. We also report on a new accretion outburst of SAX J1810.8–2609 that was observed with MAXI and Swift in 2012. The outburst had a duration of ≃17 days and reached a 2–10 keV peak luminosity of ≃ 3 × 1037 (D/5.7 kpc)2 erg s−1. This is a factor >10 more luminous than the two previous outbursts observed from the source, and classifies it as a bright rather than a faint X-ray transient.