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arXiv · 1305.4183

Swift Observations of the High-mass X-ray Binary IGR J16283-4838 unveil a 288-day Orbital Period

G. Cusumano·A. Segreto·V. La Parola·A. D'Aì·N. Masetti·G. Tagliaferri
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Abstract

We report on the temporal and spectral properties of the HMXB IGR J16283-4838 in the hard X-ray band. We searched the first 88 months of Swift BAT survey data for long-term periodic modulations. We also investigated the broad band (0.2--150 keV) spectral properties of IGR J16283--4838 complementing the BAT dataset with the soft X-ray data from the available Swift-XRT pointed observations. The BAT light curve of IGR J16283-4838 revealed a periodic modulation at P_o=287.6+7-1.7 days (with a significance higher than 4 standard deviations). The profile of the light curve folded at P_o shows a sharp peak lasting ~ 12 d, over a flat plateau. The long-term light curve shows also a ~300 d interval of prolonged enhanced emission. The observed phenomenology is suggestive of a Be nature of IGR J16283-4838, where the narrow periodic peaks and the ~300 d outburst can be interpreted as Type I and Type II outbursts, respectively. The broad band 0.2-150 keV spectrum can be described with an absorbed power-law and a steepening in the BAT energy range.

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G. Cusumano, A. Segreto, V. La Parola, A. D'Aì, N. Masetti, G. Tagliaferri. 2013-08-22. Swift Observations of the High-mass X-ray Binary IGR J16283-4838 unveil a 288-day Orbital Period. https://doi.org/10.1088/2041-8205%2F775%2F1%2Fl25

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