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Multiwavelength observations of the Be/X-ray binary IGR J01217−7257 (=SXP 2.16) during outburst

Multiwavelength observations of the Be/X-ray binary IGR J01217−7257 (=SXP 2.16) during outburst
Multiwavelength observations of the Be/X-ray binary IGR J01217−7257 (=SXP 2.16) during outburst
We present simultaneous, multiwavelength observations of the Small Magellanic Cloud Be/XRB IGR J01217−7257 (=SXP 2.16) during outbursts in 2014, 2015 and 2016. We also present the results of the RXTE observations of the Small Magellanic Cloud during which the source was initially discovered with a periodicity of 2.1652 ± 0.0001 s that we associate with the spin period of the neutron star. A systematic temporal analysis of long-term Swift/BAT data reveals a periodic signal of 82.5 ± 0.7 d, in contrast with a similar analysis of long base-line Optical Gravitational Lensing Experiment (OGLE) I-band light curves that reveals 83.67 ± 0.05 d also found in this work. Interpreting the longer X-ray periodicity as indicative of binary motion of the neutron star, we find that outbursts detected by INTEGRAL and Swift between 2014 and 2016 are consistent with type I outbursts seen in Be/XRBs, occurring around periastron. Comparing these outbursts with the OGLE data, we see a clear correlation between outburst occurrence and increasing I-band flux. A periodic analysis of subdivisions of OGLE data reveals three epochs during which short periodicities of ∼1 d are significantly detected which we suggest are non-radial pulsations (NRPs) of the companion star. These seasons immediately precede those exhibiting clear outburst behaviour, supporting the suggested association between the NRPs, decretion disc growth and the onset of type I outbursts.
0035-8711
1149-1159
Boon, C.M.
fc58cc65-37e1-41e5-9df9-99b1511d4aa3
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Coe, M.J.
04dfb23b-1456-46a3-9242-5cee983471d5
Corbet, R.H.D.
7d365a78-a577-4f56-8d3a-503b7fccb42b
Evans, P.A.
7c0ccb9f-4062-4f21-9835-171fef390d7c
Kennea, J.A.
5bda466b-abb9-42be-a687-4eeb9c602d67
Krimm, H.A.
0bef7db3-8f71-4bb3-a06d-04f81133165a
Laycock, S.G.T.
dcc0a71c-272a-4f58-b4bb-69accffcf485
Udalski, A.
a7d3b194-1531-47cd-a634-abe3b8b067b0
Boon, C.M.
fc58cc65-37e1-41e5-9df9-99b1511d4aa3
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Coe, M.J.
04dfb23b-1456-46a3-9242-5cee983471d5
Corbet, R.H.D.
7d365a78-a577-4f56-8d3a-503b7fccb42b
Evans, P.A.
7c0ccb9f-4062-4f21-9835-171fef390d7c
Kennea, J.A.
5bda466b-abb9-42be-a687-4eeb9c602d67
Krimm, H.A.
0bef7db3-8f71-4bb3-a06d-04f81133165a
Laycock, S.G.T.
dcc0a71c-272a-4f58-b4bb-69accffcf485
Udalski, A.
a7d3b194-1531-47cd-a634-abe3b8b067b0

Boon, C.M., Bird, A.J., Coe, M.J., Corbet, R.H.D., Evans, P.A., Kennea, J.A., Krimm, H.A., Laycock, S.G.T. and Udalski, A. (2017) Multiwavelength observations of the Be/X-ray binary IGR J01217−7257 (=SXP 2.16) during outburst. Monthly Notices of the Royal Astronomical Society, 466 (1), 1149-1159. (doi:10.1093/mnras/stw3169).

Record type: Article

Abstract

We present simultaneous, multiwavelength observations of the Small Magellanic Cloud Be/XRB IGR J01217−7257 (=SXP 2.16) during outbursts in 2014, 2015 and 2016. We also present the results of the RXTE observations of the Small Magellanic Cloud during which the source was initially discovered with a periodicity of 2.1652 ± 0.0001 s that we associate with the spin period of the neutron star. A systematic temporal analysis of long-term Swift/BAT data reveals a periodic signal of 82.5 ± 0.7 d, in contrast with a similar analysis of long base-line Optical Gravitational Lensing Experiment (OGLE) I-band light curves that reveals 83.67 ± 0.05 d also found in this work. Interpreting the longer X-ray periodicity as indicative of binary motion of the neutron star, we find that outbursts detected by INTEGRAL and Swift between 2014 and 2016 are consistent with type I outbursts seen in Be/XRBs, occurring around periastron. Comparing these outbursts with the OGLE data, we see a clear correlation between outburst occurrence and increasing I-band flux. A periodic analysis of subdivisions of OGLE data reveals three epochs during which short periodicities of ∼1 d are significantly detected which we suggest are non-radial pulsations (NRPs) of the companion star. These seasons immediately precede those exhibiting clear outburst behaviour, supporting the suggested association between the NRPs, decretion disc growth and the onset of type I outbursts.

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More information

Accepted/In Press date: 2 December 2016
e-pub ahead of print date: 7 December 2016
Published date: April 2017

Identifiers

Local EPrints ID: 428884
URI: https://eprints.soton.ac.uk/id/eprint/428884
ISSN: 0035-8711
PURE UUID: 971068e6-ee3e-4654-80cd-ca280d011e25
ORCID for C.M. Boon: ORCID iD orcid.org/0000-0002-9566-7873
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937
ORCID for M.J. Coe: ORCID iD orcid.org/0000-0002-0763-8547

Catalogue record

Date deposited: 13 Mar 2019 19:19
Last modified: 14 Mar 2019 01:56

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