MKT J170456.2-482100: the first transient discovered by MeerKAT

Abstract

We report the discovery of the first transient with MeerKAT, MKT J170456.2$-$482100, discovered in ThunderKAT images of the low mass X-ray binary GX339$-$4. MKT J170456.2$-$482100 is variable in the radio, reaching a maximum flux density of $0.71\pm 0.11\mathrm{mJy}$ on 2019 Oct 12, and is undetected in 15 out of 48 ThunderKAT epochs. MKT J170456.2$-$482100 is coincident with the chromospherically active K-type sub-giant TYC 8332-2529-1, and $\sim 18\mathrm{years}$ of archival optical photometry of the star shows that it varies with a period of $21.25\pm 0.04\mathrm{days}$. The shape and phase of the optical light curve changes over time, and we detect both X-ray and UV emission at the position of MKT J170456.2$-$482100, which may indicate that TYC 8332-2529-1 has large star spots. Spectroscopic analysis shows that TYC 8332-2529-1 is in a binary, and has a line-of-sight radial velocity amplitude of $43\mathrm{km}{\mathrm{s}}^{-1}$. We also observe a spectral feature in anti-phase with the K-type sub-giant, with a line-of-sight radial velocity amplitude of $\sim 12\pm 10\mathrm{km}{\mathrm{s}}^{-1}$, whose origins cannot currently be explained. Further observations and investigation are required to determine the nature of the MKT J170456.2$-$482100 system.

arXiv comment16 pages, 12 figures, 7 tables

References in corpus (74)

• Astropy: A Community Python Package for Astronomy
• Gaia Data Release 2. Summary of the contents and survey properties
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The Gaia mission
• LOFAR: The LOw-Frequency ARray
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• Astrophysics Source Code Library
• Las Cumbres Observatory Global Telescope Network
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• Improving PARSEC models for very low mass stars
• Scattering by Interstellar Dust Grains: Optical and Ultraviolet
• PARSEC evolutionary tracks of massive stars up to $350M_{\odot }$ at metallicities 0.0001$\le Z\le$0.04
• A Radio Counterpart to a Neutron Star Merger
• A Decade of Short-duration Gamma-ray Burst Broad-band Afterglows: Energetics, Circumburst Densities, and Jet Opening Angles
• New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies
• Fourier Techniques for Very Long Astrophysical Time Series Analysis
• The Birth of a Relativistic Outflow in the Unusual γ-ray Transient Swift J164449.3+573451
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• The Kilodegree Extremely Little Telescope (KELT): A Small Robotic Telescope for Large-Area Synoptic Surveys
• Pulsar Nulling and Mode Changing
• Fundamental parameters and infrared excesses of Hipparcos stars
• Faceting for direction-dependent spectral deconvolution
• A Radio-Selected Sample of Gamma Ray Burst Afterglows
• A radio pulsing white dwarf binary star
• Radio interferometric gain calibration as a complex optimization problem
• A powerful bursting radio source towards the Galactic Centre
• All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog
• Revival of the magnetar PSR J1622-4950: observations with MeerKAT, Parkes, XMM-Newton, Swift, Chandra, and NuSTAR
• The Caltech-NRAO Stripe 82 Survey (CNSS) Paper I: The Pilot Radio Transient Survey In 50 deg${}^2$
• Fundamental parameters and infrared excesses of Tycho-Gaia stars
• Ultra-Wideband Detection of 22 Coherent Radio Bursts on M Dwarfs
• Mass loss on the red giant branch: the value and metallicity dependence of Reimers' η in globular clusters
• VAST: An ASKAP Survey for Variables and Slow Transients
• SubmilliJansky Transients in Archival Radio Observations
• MN48: a new Galactic bona fide luminous blue variable revealed by Spitzer and SALT
• Construction of a Calibrated Probabilistic Classification Catalog: Application to 50k Variable Sources in the All-Sky Automated Survey
• Polarimetric evidence of a white dwarf pulsar in the binary system AR Scorpii
• The High Time Resolution Universe survey XIV: Discovery of 23 pulsars through GPU-accelerated reprocessing
• A Revised View of the Transient Radio Sky
• A VLA search for 5 GHz radio transients and variables at low Galactic latitudes
• A 22-year Southern Sky Survey for Transient and Variable Radio Sources using the Molonglo Observatory Synthesis Telescope
• Variable and Transient Radio Sources in the FIRST Survey
• OGLE small amplitude red giant variables in the Galactic Bar
• The variability timescales and brightness temperatures of radio flares from stars to supermassive black holes
• LOFAR MSSS: Detection of a low-frequency radio transient in 400 hrs of monitoring of the North Celestial Pole
• Ultra-high-time Resolution Observations of Radio Bursts on AD Leonis
• The UTMOST pulsar timing programme I: overview and first results
• Exploring the Transient Radio Sky with VLITE: Early Results
• ASKAP Detection of Periodic and Elliptically Polarized Radio Pulses from UV Ceti
• Dwarf nova-type cataclysmic variable stars are significant radio emitters
• GCRT J1742-3001: A New Radio Transient Towards the Galactic Center
• Polarized QPOs from the INTEGRAL polar IGRJ14536-5522 (=Swift J1453.4-5524)
• A search for long-timescale, low-frequency radio transients
• New methods to constrain the radio transient rate: results from a survey of four fields with LOFAR
• A non-thermal pulsed X-ray emission of AR~Scorpii
• Improving timing sensitivity in the microhertz frequency regime: limits from PSR J1713$+$0747 on gravitational waves produced by super-massive black-hole binaries
• ThunderKAT: The MeerKAT Large Survey Project for Image-Plane Radio Transients
• The structure of accretion flows in nova-like cataclysmic variables: RW Sextantis and 1RXS J064434.5+334451
• VLA multifrequency observations of RS CVn binaries
• Rapid Radio Flaring during an Anomalous Outburst of SS Cyg
• A detailed radio study of the energetic, nearby and puzzling GRB 171010A
• PTF12gzk - A Rapidly Declining, High-Velocity Type Ic Radio Supernova
• Circularly polarized emission from the transient bursting radio source GCRT J1745-3009
• Detection of a Low-frequency Cosmic Radio Transient Using Two LWA Stations
• A pilot survey for transients and variables with the Australian Square Kilometre Array Pathfinder
• Are Starspots and Plages Co-Located on Active G and K Stars?
• The Karl G. Jansky Very Large Array Sky Survey (VLASS). Science case and survey design
• AARTFAAC Flux Density Calibration and Northern Hemisphere Catalogue at 60 MHz
• The Galactic halo pulsar population
• A Case Study of On-the-Fly Wide-Field Radio Imaging Applied to the Gravitational-wave Event GW 151226
• Transient Emissions from Radio-Active Stars: Implications for Wide-Field Radio Surveys

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