The 2019 outburst of AMXP SAX J1808.4-3658 and radio follow up of MAXI J0911-655 and XTE J1701-462

Abstract

We present radio coverage of the 2019 outburst of the accreting millisecond X-ray pulsar SAX J1808.4-3658, obtained with MeerKAT. We compare these data to contemporaneous X-ray and optical measurements in order to investigate the coupling between accretion and jet formation in this system, while the optical lightcurve provides greater detail of the outburst. The reflaring activity following the main outburst peak was associated with a radio re-brightening, indicating a strengthening of the jet in this phase of the outburst. We place quasi-simultaneous radio and X-ray measurements on the global radio:X-ray plane for X-ray binaries, and show they reside in the same region of luminosity space as previous outburst measurements, but significantly refine the correlation for this source. We also present upper limits on the radio emission from the accreting millisecond X-ray pulsar MAXI J0911-655 and the transitional Z/Atoll-type transient XTE J1701-462. In the latter source we also confirm that nearby large-scale structures reported in previous radio observations of the source are persistent over a period of ~15 years, and so are almost certainly background radio galaxies and not associated with the X-ray transient.

arXiv commentContains 9 pages and 3 figures, accepted for publication in MNRAS

References in corpus (35)

• On the Absorption of X-rays in the Interstellar Medium
• The Swift X-ray Telescope
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• A universal radio/X-ray correlation in low/hard state black hole binaries
• First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer
• Calibration of the Rossi X-ray Timing Explorer Proportional Counter Array
• Radio / X-ray correlation in the low/hard state of GX 339--4
• Jets in neutron star X-ray binaries: a comparison with black holes
• The two-hour orbit of a binary millisecond X-ray pulsar
• The "universal" radio/X-ray flux correlation : the case study of the black hole GX 339-4
• Gas Slit Camera (GSC) onboard MAXI on ISS
• Spectral States of XTE J1701-462: Link between Z and Atoll Sources
• Helium-rich thermonuclear bursts and the distance to the accretion-powered millisecond pulsar SAX J1808.4-3658
• On the peak radio and X-ray emission from neutron star and black hole candidate X-ray transients
• How Do Z and Atoll X-ray Binaries Differ?
• RXTE observations of the first transient Z source XTE J1701-462: shedding new light on mass accretion in luminous neutron star LMXBs
• Stellar Mass Black Holes and Ultraluminous X-Ray Sources
• Hard state neutron star and black hole X-ray binaries in the radio:X-ray luminosity plane
• Radio imaging observations of PSR J1023+0038 in an LMXB state
• Disc-jet coupling in an atoll-type neutron star X-ray binary: 4U 1728-34 (GX 354-0)
• Accreting Millisecond X-Ray Pulsars
• A NICER thermonuclear burst from the millisecond X-ray pulsar SAX J1808.4-3658
• Disk-jet coupling in low-luminosity accreting neutron stars
• The disc-jet coupling in the neutron star X-ray binary Aquila X-1
• A new radio census of neutron star X-ray binaries
• The broad-band power spectrum of SAX J1808.4-3658
• Discovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808
• 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
• The ``Outside-In'' Outburst of HT Cassiopeiae
• The hybrid radio/X-ray correlation of the black hole transient MAXI J1348-630
• Quasi-simultaneous radio and X-ray observations of Aql X-1: probing low luminosities
• The variable radio counterpart and possible large-scale jet of the new Z-source XTE J1701-462
• Probing jet launching in neutron star X-ray binaries: the variable and polarized jet of SAX J1808.4-3658
• e-VLBI observations of Circinus X-1: monitoring of the quiescent and flaring radio emission on AU scales

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• Discovery of strongly variable X-ray polarization in the neutron star low-mass X-ray binary transient XTE J1701$-$462
• Detection of significant X-ray polarization from transient NS-LMXB XTE J1701-462 with IXPE and its implication on the coronal geometry
• Bursts from Space: MeerKAT - The first citizen science project dedicated to commensal radio transients
• The Accretion-Ejection Connection in the Black Hole X-ray Binary MAXI J1820$+$070
• Spectral Analysis of the 2019 and 2022 Outbursts of SAX J1808.4-3658