Probing jet launching in neutron star X-ray binaries: the variable and polarized jet of SAX J1808.4-3658
arXiv:2010.15176 · doi:10.3847/1538-4357/abc685
Abstract
We report on an optical photometric and polarimetric campaign on the accreting millisecond X-ray pulsar (AMXP) SAX J1808.4-3658 during its 2019 outburst. The emergence of a low-frequency excess in the spectral energy distribution in the form of a red excess above the disc spectrum (seen most prominently in z, i and R-bands) is observed as the outburst evolves. This is indicative of optically thin synchrotron emission due to a jet, as seen previously in this source and in other AMXPs during outburst. At the end of the outburst decay, the source entered a reflaring state. The low-frequency excess is still observed during the reflares. Our optical (BVRI) polarimetric campaign shows variable linear polarization (LP) throughout the outburst. We show that this is intrinsic to the source, with low-level but significant detections (0.2-2%) in all bands. The LP spectrum is red during both the main outburst and the reflaring state, favoring a jet origin for this variable polarization over other interpretations, such as Thomson scattering with free electrons from the disc or the propelled matter. During the reflaring state, a few episodes with stronger LP level (1-2 %) are observed. The low-level, variable LP is suggestive of strongly tangled magnetic fields near the base of the jet. These results clearly demonstrate how polarimetry is a powerful tool for probing the magnetic field structure in X-ray binary jets, similar to AGN jets.
arXiv commentAccepted for publication in ApJ
References in corpus (74)
- emcee: The MCMC Hammer
- The Pan-STARRS1 Photometric System
- A Scheme to Unify Low-Power Accreting Black Holes - Jet-Dominated Accretion Flows and the Radio/X-Ray Correlation
- Homogeneous Photometry for Star Clusters and Resolved Galaxies. II. Photometric Standard Stars
- Empirical Color Transformations Between SDSS Photometry and Other Photometric Systems
- Powerful jets from black hole X-ray binaries in Low/Hard X-ray states
- Jets in neutron star X-ray binaries: a comparison with black holes
- Data analysis recipes: Using Markov Chain Monte Carlo
- The two-hour orbit of a binary millisecond X-ray pulsar
- Markov Chain Monte Carlo Methods for Bayesian Data Analysis in Astronomy
- Near-infrared synchrotron emission from the compact jet of GX339-4
- The Disk-Magnetosphere Interaction in the Accretion-Powered Millisecond Pulsar SAX J1808.4-3658
- A variable mid-infrared synchrotron break associated with the compact jet in GX 339-4
- Black hole-like hysteresis and accretion states in neutron star low mass X-ray binaries
- Helium-rich thermonuclear bursts and the distance to the accretion-powered millisecond pulsar SAX J1808.4-3658
- A Brown Dwarf Companion for the Accreting Millisecond Pulsar SAX J1808.4-3658
- Probing X-ray Absorption and Optical Extinction in the Interstellar Medium Using Chandra Observations of Supernova Remnants
- Rapid optical and X-ray timing observations of GX 339-4: multi-component optical variability in the low/hard state
- Jet spectral breaks in black hole X-ray binaries
- Optical spectroscopy and photometry of SAX J1808.4-3658 in outburst
- Formation of the compact jets in the black hole GX 339-4
- The complete spectrum of the neutron star X-ray binary 4U0614+091
- Disc-jet coupling in an atoll-type neutron star X-ray binary: 4U 1728-34 (GX 354-0)
- Evidence for a jet contribution to the optical/infrared light of neutron star X-ray binaries
- An evolving compact jet in the black hole X-ray binary MAXI J1836-194
- Radio detections of the neutron star X-ray binaries 4U 1820-30 and Ser X-1 in soft X-ray states
- Evolution of the radio - X-ray coupling throughout an entire outburst of Aquila X-1
- Near-infrared jet emission in the microquasar XTE J1550-564
- Disk-jet coupling in low-luminosity accreting neutron stars
- The disc-jet coupling in the neutron star X-ray binary Aquila X-1
- Optical Observations of SAX J1808.4-3658 During Quiescence
- The erratic luminosity behavior of SAX J1808.4-3658 during its 2000 outburst
- The Optical Counterpart of the Accreting Millisecond Pulsar SAX J1808.4-3658 in Outburst: Constraints on the Binary Inclination
- Overview of an Extensive Multi-wavelength Study of GX 339-4 during the 2010 Outburst
- Events leading up to the June 2015 outburst of V404 Cyg
- Systematic Trends In Sloan Digital Sky Survey Photometric Data
- Outburst Morphology in the Soft X-ray Transient Aquila X-1
- Optical precursors to X-ray binary outbursts
- Further Evidence for Variable Synchrotron Emission in XTE J1118+480 in Outburst
- The Reflares and Outburst Evolution in the Accreting Millisecond Pulsar SAX J1808.4-3658: a Disk Truncated Near Co-rotation?
- Transient radio emisison from SAX J1808.4-3658
- Polarised infrared emission from X-ray binary jets
- The X-ray Position and Optical Counterpart of the Accretion-Powered Millisecond Pulsar XTE J1814-338
- On the timing properties of SAX J1808.4-3658 during its 2015 outburst
- The multi-wavelength polarization of Cygnus X-1
- NuSTAR and XMM-Newton broad-band spectrum of SAX J1808.4-3658 during its latest outburst in 2015
- Lorentz Factors of compact jets in Black hole X-ray binaries
- Bright mini-outburst ends the 12-year long activity of the black hole candidate Swift J1753.5-0127
- Accreting pulsars: mixing-up accretion phases in transitional systems
- Observations of the 599 Hz Accreting X-ray Pulsar IGR J00291+5934 during the 2004 Outburst and in Quiescence
- The first polarimetric signatures of infrared jets in X-ray binaries
- Time-resolved optical/near-IR polarimetry of V404 Cyg during its 2015 outburst
- The Double-Peaked 2008 Outburst of the Accreting Milli-Second X-ray Pulsar, IGR J00291+5934
- Jet quenching in the neutron star low-mass X-ray binary 1RXS J180408.9342058
- The evolving jet spectrum of the neutron star X-ray binary Aql X-1 in transitional states during its 2016 outburst
- Enhanced optical activity 12 days before X-ray activity, and a 4 day X-ray delay during outburst rise, in a low-mass X-ray binary
- A wildly flickering jet in the black hole X-ray binary MAXI J1535-571
- Tracking the variable jets of V404 Cygni during its 2015 outburst
- A tool to separate optical/infrared disc and jet emission in X-ray transient outbursts: the colour-magnitude diagrams of XTE J1550-564
- 1RXS J180408.9-342058: an ultra compact X-ray binary candidate with a transient jet
- Timing the pulsations of the accreting millisecond pulsar SAX J1808.4-3658 during its 2019 outburst
- The optical counterpart of XTE J0929-314, the third transient millisecond X-ray pulsar
- WISE Detection of the Galactic Low-Mass X-Ray Binaries
- Different twins in the millisecond pulsar recycling scenario: optical polarimetry of PSR J1023+0038 and XSS J12270-4859
- Variable polarisation and Doppler tomography of PSR J1023+0038 - Evidence for the magnetic propeller during flaring?
- The long-term evolution of the X-ray pulsar XTE J1814-338: a receding jet contribution to the quiescent optical emission?
- Polarimetric and spectroscopic optical observations of the ultra-compact X-ray binary 4U 0614+091
- MASTER optical polarization variability detection in the Microquasar V404 Cyg/GS2023+33
- A transient I band excess in the optical spectrum of the accreting millisecond pulsar SAX J1808.4-3658
- Peering at the outflow mechanisms in the transitional pulsar PSR J1023+0038: simultaneous VLT, XMM-Newton, and Swift high-time resolution observations
- Frequentist tests for Bayesian models
- Optical and infrared polarimetry of the transient LMXB Cen X-4 in quiescence
- Polarimetry of binary systems: polars, magnetic CVs, XRBs
- Optical/infrared polarised emission in X-ray binaries
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- Seven reflares, a mini-outburst and an outburst : High amplitude optical variations in the black hole X-ray binary Swift J1910.2-0546
- The 2019 outburst of AMXP SAX J1808.4-3658 and radio follow up of MAXI J0911-655 and XTE J1701-462
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- Spectral Analysis of the 2019 and 2022 Outbursts of SAX J1808.4-3658