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

C. M. Boon, A. J. Bird, M. J. Coe, R. H.D. Corbet, P. A. Evans, Jamie A. Kennea, H. A. Krimm, S. G.T. Laycock, A. Udalski

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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.

Original languageEnglish (US)
Pages (from-to)1149-1159
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume466
Issue number1
DOIs
StatePublished - Jan 1 2017

Fingerprint

outburst
periodic variations
Magellanic clouds
neutron stars
companion stars
subdivisions
x rays
periodicity
X Ray Timing Explorer
light curve
time measurement
occurrences
temporal analysis
experiment

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Boon, C. M. ; Bird, A. J. ; Coe, M. J. ; Corbet, R. H.D. ; Evans, P. A. ; Kennea, Jamie A. ; Krimm, H. A. ; Laycock, S. G.T. ; Udalski, A. / Multiwavelength observations of the Be/X-ray binary IGR J01217-7257 (=SXP 2.16) during outburst. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 466, No. 1. pp. 1149-1159.
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title = "Multiwavelength observations of the Be/X-ray binary IGR J01217-7257 (=SXP 2.16) during outburst",
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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Boon, CM, Bird, AJ, Coe, MJ, Corbet, RHD, Evans, PA, Kennea, JA, Krimm, HA, Laycock, SGT & 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, vol. 466, no. 1, pp. 1149-1159. https://doi.org/10.1093/mnras/stw3169

Multiwavelength observations of the Be/X-ray binary IGR J01217-7257 (=SXP 2.16) during outburst. / Boon, C. M.; Bird, A. J.; Coe, M. J.; Corbet, R. H.D.; Evans, P. A.; Kennea, Jamie A.; Krimm, H. A.; Laycock, S. G.T.; Udalski, A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 466, No. 1, 01.01.2017, p. 1149-1159.

Research output: Contribution to journalArticle

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T1 - Multiwavelength observations of the Be/X-ray binary IGR J01217-7257 (=SXP 2.16) during outburst

AU - Boon, C. M.

AU - Bird, A. J.

AU - Coe, M. J.

AU - Corbet, R. H.D.

AU - Evans, P. A.

AU - Kennea, Jamie A.

AU - Krimm, H. A.

AU - Laycock, S. G.T.

AU - Udalski, A.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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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