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

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

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.

Accretion, Accretion discs, Stars: neutron, X-rays: binaries, X-rays: individual: IGR J17062-6143
0035-8711
2027-2044
van den Eijnden, J.
abb08069-7f5c-430a-a68f-6ff0bb0d920a
Degenaar, N.
54149051-d74e-4e43-a7cd-501ec4023511
Pinto, C.
3331e9ac-b6c6-4967-af51-3bbce228c1c4
Patruno, A.
61450a42-2fa8-4ca1-a0af-44f2dfe14fcc
Wette, K.
44d0a499-17a1-4b67-9740-15ef0da756c1
Messenger, C.
8a2bb3b3-d421-4508-90c9-db50ffcc625a
Hernández Santisteban, J.V.
115e9657-d594-487b-b871-5c61cc32f692
Wijnands, R.
382893ee-0e03-45e3-9321-db8b9fc74914
Miller, J.M.
078305f0-03c7-4982-95ff-a92bc2f75b54
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Paerels, F.
a60020f7-e623-442b-a2d5-c1cf4a957d69
Chakrabarty, D.
f70eba21-20cc-4f7f-87b3-ccd8716ddea1
Fabian, A.C.
b9bef0bc-2ecd-49dc-ab2b-954cabea88ba
van den Eijnden, J.
abb08069-7f5c-430a-a68f-6ff0bb0d920a
Degenaar, N.
54149051-d74e-4e43-a7cd-501ec4023511
Pinto, C.
3331e9ac-b6c6-4967-af51-3bbce228c1c4
Patruno, A.
61450a42-2fa8-4ca1-a0af-44f2dfe14fcc
Wette, K.
44d0a499-17a1-4b67-9740-15ef0da756c1
Messenger, C.
8a2bb3b3-d421-4508-90c9-db50ffcc625a
Hernández Santisteban, J.V.
115e9657-d594-487b-b871-5c61cc32f692
Wijnands, R.
382893ee-0e03-45e3-9321-db8b9fc74914
Miller, J.M.
078305f0-03c7-4982-95ff-a92bc2f75b54
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Paerels, F.
a60020f7-e623-442b-a2d5-c1cf4a957d69
Chakrabarty, D.
f70eba21-20cc-4f7f-87b3-ccd8716ddea1
Fabian, A.C.
b9bef0bc-2ecd-49dc-ab2b-954cabea88ba

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., Chakrabarty, D. and Fabian, A.C. (2018) 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), 2027-2044. (doi:10.1093/mnras/stx3224).

Record type: Article

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.

Full text not available from this repository.

More information

Accepted/In Press date: 9 December 2017
e-pub ahead of print date: 15 December 2017
Published date: 1 April 2018
Keywords: Accretion, Accretion discs, Stars: neutron, X-rays: binaries, X-rays: individual: IGR J17062-6143

Identifiers

Local EPrints ID: 420623
URI: http://eprints.soton.ac.uk/id/eprint/420623
ISSN: 0035-8711
PURE UUID: 821d7d40-f028-41df-a416-30784f129141
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

Catalogue record

Date deposited: 11 May 2018 16:30
Last modified: 17 Dec 2019 01:35

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