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The very faint X-ray binary IGR J17062-6143: a truncated disc, no pulsations, and a possible outflow

Author(s)
van den Eijnden, J; Degenaar, N; Pinto, C; Patruno, A; Wette, K; Messenger, C; Hernández Santisteban, J V; Wijnands, R; Miller, J M; Altamirano, D; Paerels, F; Fabian, A C; Chakrabarty, Deepto; ... Show more Show less
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Abstract
We present a comprehensive X-ray study of the neutron star low-mass X-ray binary IGR J17062-6143, which has been accreting at low luminosities since its discovery in 2006. Analysing NuSTAR, XMM-Newton, and Swift observations, we investigate the very faint nature of this source through three approaches: modelling the relativistic reflection spectrum to constrain the accretion geometry, performing high-resolution X-ray spectroscopy to search for an outflow, and searching for the recently reported millisecond X-ray pulsations. We find a strongly truncated accretion disc at 77 -18+22 gravitational radii (~164 km) assuming a high inclination, although a low inclination and a disc extending to the neutron star cannot be excluded. The high-resolution spectroscopy reveals evidence for oxygen-rich circumbinary material, possibly resulting from a blueshifted, collisionally ionized outflow. Finally, we do not detect any pulsations. We discuss these results in the broader context of possible explanations for the persistent faint nature of weakly accreting neutron stars. The results are consistent with both an ultra-compact binary orbit and a magnetically truncated accretion flow, although both cannot be unambiguously inferred. We also discuss the nature of the donor star and conclude that it is likely a CO or O-Ne-Mg white dwarf, consistent with recent multiwavelength modelling. Keywords: accretion; accretion discs; stars:neutron; X-rays: binaries; X-ray:individual: IGR J17062-6143
Date issued
2017-12
URI
http://hdl.handle.net/1721.1/120975
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Citation
Van den Eijnden et al. “The Very Faint X-Ray Binary IGR J17062-6143: a Truncated Disc, No Pulsations, and a Possible Outflow.” Monthly Notices of the Royal Astronomical Society 475, 2 (December 2017): 2027–2044 © 2017 The Authors
Version: Author's final manuscript
ISSN
0035-8711
1365-2966

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