An equatorial outflow in the black hole optical dipper Swift J1357.2-0933

Abstract

We present high-time resolution optical spectroscopy and imaging of the black hole transient Swift J1357.2-0933 during its 2017 outburst. The light curves show recurrent dips resembling those discovered during the 2011 outburst. The dip properties (e.g duration and depth) as well as the evolution of their recurrence time are similar to those seen in 2011. Spectra obtained during the dips are characterised by broad and blue-shifted absorptions in Balmer and He ii. The absorptions show core velocities of $\sim$ -800 km/s and terminal velocities approaching $\sim$ 3000 km/s i.e. in the upper-end of wind velocities measured in other black hole transients (both at optical and X-ray wavelengths). Our observations suggest that the dips are formed in a dense and clumpy outflow, produced near the disc equatorial plane and seen at high inclination. We also study the colour evolution and observe that, as it has been previously reported, the source turns bluer during dips. We show that this is due to a gradual change in the slope of the optical continuum and discuss possible implications of this behaviour.

arXiv commentsubmitted to MNRAS after minor revision (16-Jul-2019)

References in corpus (32)

• Astropy: A Community Python Package for Astronomy
• Correcting for the Effects of Interstellar Extinction
• X-ray Properties of Black-Hole Binaries
• Cosmic-Ray Rejection by Laplacian Edge Detection
• Understanding the Lomb-Scargle Periodogram
• A universal radio/X-ray correlation in low/hard state black hole binaries
• Radio / X-ray correlation in the low/hard state of GX 339--4
• Ubiquitous equatorial accretion disc winds in black hole soft states
• The magnetic nature of disk accretion onto black holes
• Regulation of black-hole accretion by a disk wind during a violent outburst of V404 Cygni
• Accretion disc atmospheres and winds in low-mass X-ray binaries
• Mass loss from inhomogeneous hot star winds II. Constraints from a combined optical/UV study
• A Black Hole Nova Obscured by an Inner Disk Torus
• Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070
• Evidence for quiescent synchrotron emission in the black hole X-ray transient Swift J1357.2-0933
• Multiwavelength spectral evolution during the 2011 outburst of the very faint X-ray transient Swift J1357.2-0933
• Swift J1357.2-0933: a massive black hole in the Galactic thick disc
• The low-luminosity accretion disc wind of the black hole transient V4641 Sagittarii
• Optical Spectroscopy Of The X-Ray Transient XTE J1118+480 In Outburst
• Mass ratio determination from Halpha lines in Black-Hole X-ray transients
• High ionisation absorption in low mass X-ray binaries
• The balance of power: accretion and feedback in stellar mass black holes
• The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
• An X-ray view of the very faint black hole X-ray transient Swift J1357.2-0933 during its 2011 outburst
• Hot, dense He II outflows during the 2017 outburst of the X-ray transient Swift J1357.2-0933
• VLT spectroscopy of the Black Hole Candidate Swift J1357.2-0933 in Quiescence
• The complex evolution of the X-ray binary transient MAXI J1807+132 along the decay of its discovery outburst
• The black hole X-ray transient Swift J1357.2-0933 as seen with Swift and NuSTAR during its 2017 outburst
• Rapidly varying Mg II broad absorption line in SDSS J133356.02+001229.1
• Puzzling Blue Dips in the Black Hole Candidate Swift J1357.2-0933, from ULTRACAM, SALT, ATCA, Swift and NuSTAR
• Emission Lines in the Near-infrared Spectra of the Infrared Quintuplet Stars in the Galactic Center
• Interstellar Extinction in the Milky Way Galaxy

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• Delimiting the black hole mass in the X-ray transient MAXI J1659-152 with H$\alpha$ spectroscopy
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• Optical and near-infrared spectroscopy of the black hole transient 4U 1543-47 during its 2021 ultra-luminous state
• Optical nebular emission following the most luminous outburst of Aquila X-1
• Ask The Machine: Systematic detection of wind-type outflows in low-mass X-ray binaries
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• Tracking optical variability and outflows across the accretion states of the black hole transient MAXI J1820+070
• Ubiquitous yet forgotten: broad absorptions in the optical spectra of low-mass X-ray binaries
• H$\beta$ spectroscopy of the high-inclination black hole transient Swift J1357.2-0933 during quiescence
• Ultraviolet spectroscopy of the black hole X-ray binary MAXI J1820+070 across a state transition
• A self-shadowing black hole accretion disk at sub-Eddington luminosities