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IGR J16318-4848: optical and near-infrared spectroscopy of the most absorbed B[e] supergiant X-ray binary with VLT/X-Shooter

Published online by Cambridge University Press:  30 December 2019

F. Fortin Open the ORCID record for F. Fortin [Opens in a new window] ,
S. Chaty ,
P. Goldoni  and
A. Goldwurm
F. Fortin
Affiliation:
Laboratoire AIM (UMR 7158 CEA/DRF - CNRS - Université Paris Diderot), Irfu / Département dAstrophysique, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
S. Chaty
Affiliation:
Laboratoire AIM (UMR 7158 CEA/DRF - CNRS - Université Paris Diderot), Irfu / Département dAstrophysique, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
P. Goldoni
Affiliation:
APC, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
A. Goldwurm
Affiliation:
APC, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
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Abstract

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The supergiant high-mass X-ray binary IGR J16318-4848 was detected by INTEGRAL in 2003 and distinguishes itself by its high intrinsic absorption and B[e] phenomenon. It is the perfect candidate to study both binary interaction and the environment of supergiant B[e] stars. We report on VLT/X-Shooter observations from July 2012 in both optical and near-infrared, which provide unprecedented wide-range, well-resolved spectra of IGR J16318-4848 from 0.5 to 2.5 μm. Adding VLT/VISIR and Herschel data, the spectral energy distribution fitting allows us to further constrain the contribution of each emission region (central star, irradiated rim, dusty disc). We derive geometrical parameters using the numerous emitting and absorbing elements in each different sites in the binary. Various line shapes are detected, such as P-Cygni profiles and flat-topped lines, which are the signature of outflowing material. Preliminary results confirm the edge-on line of sight and the equatorial configuration of expanding material, along with the detection of a potentially very collimated polar outflow. These are evidence that the extreme environment of IGR J16318-4848 is ideal to have a better grasp of highly obscured high-mass X-ray binaries.

Keywords

infrared: stars - optical: starsX-rays: binariesX-rays: IGR J16318-4848stars: binaries: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 152 - 157
Copyright
© International Astronomical Union 2019 

Footnotes

†

Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under program ID 089.D-0056(A).

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