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Timing and spectral study of the Be XRB IGR J11305-6256: Swift discovers the orbital period and a soft X-ray excess

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arxiv 1305.3916 v1 pith:4UJGEQYZ submitted 2013-05-16 astro-ph.HE

V. La Parola (INAF-IASFPalermo) , A. D'Aì (UNIPA) , G. Cusumano (INAF-IASF Pa) , A. Segreto (INAF-IASF Pa) , N. Masetti (INAF-IASF Bo) , A. Melandri (INAF- OAB) This is my paper · ORCID
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keywords j11305-6256orbitalperiodx-raybinarycompanioncut-offdiscovered
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abstract

IGR J11305-6256 is one of the numerous sources discovered through the INTEGRAL scan of the Galactic Plane. Thanks to the Swift-BAT survey, that allows the frequent sampling of any sky region, we have discovered in the hard X-ray emission of this source a modulation with a period of ~120.83 d. The significance of this periodic modulation is ~4 standard deviations in Gaussian statistics. We interpret it as the orbital period of the binary system. We derive an orbital separation between IGR J11305-6256 and its companion star of ~286 R$_{\odot}$ corresponding to ~19 times the radius of the companion star. The broadband XRT-BAT (0.3-150 keV) spectrum is described either by the sum of a black-body and a cut-off power-law or by a partially absorbed cut-off power-law. The temporal and spectral characteristics of the source indicate its possible association with the class of persistent, but faint, Be X-ray binary systems.

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Cited by 2 Pith papers

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  1. The low luminosity end of Galactic HMXBs with eROSITA: Establishing a luminosity floor for accreting BeXRBs

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    astro-ph.HE 2025-04 conditional novelty 5.0 of 10

    From 36 neutron-star X-ray binaries, the best-fitting natal kick model is a bimodal Maxwellian with sigma=320 km/s for core-collapse supernovae and sigma=80 km/s for electron-capture supernovae.

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