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

Published online by Cambridge University Press:  20 March 2013

N. Degenaar  and
R. Wijnands
N. Degenaar
Affiliation:
University of Michigan, Dept. of Astronomy, 500 Church St, Ann Arbor, MI 48109, USA email: degenaar@umich.edu
R. Wijnands
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam Postbus 94249, 1090 GE Amsterdam, The Netherlands email: r.a.d.wijnands@uva.nl
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Abstract

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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.

Keywords

stars: neutronX-rays: binariesX-rays: burstsX-rays: individual (SAX J1810.8–2609)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 141 - 144
Copyright
Copyright © International Astronomical Union 2013

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