Radio Transients and Variables in the Tenth Deeper, Wider, Faster Observing Run

Abstract

The Deeper, Wider, Faster (DWF) program coordinates observations with telescopes across the electromagnetic spectrum, searching for transients on timescales of milliseconds to days. The tenth DWF observing run was carried out in near real-time during September 2021 and consisted of six consecutive days of observations of the NGC 6744 galaxy group and a field containing the repeating fast radio burst FRB190711 with the Australian Square Kilometre Array Pathfinder, the Dark Energy Camera, the Hard X-ray Modulation Telescope and the Parkes 64m "Murriyang" radio telescope. In this work we present the results of an image-domain search for transient, variable and circularly polarised sources carried out with ASKAP using data from the observing run, along with test observations prior to the run and follow-up observations carried out during and after the run. We identified eight variable radio sources, consisting of one pulsar, six stellar systems (five of which exhibit circularly polarised emission) and one previously uncatalogued source. Of particular interest is the detection of pulses from the ultra-cool dwarf SCR J1845-6357 with a period of $14.2\pm 0.3$ h, in good agreement with the known optical rotation period, making this the slowest rotating radio-loud ultra-cool dwarf discovered.

References in corpus (25)

• The Gaia mission
• Transient pulsed radio emission from a magnetar
• Assessing statistical significance of periodogram peaks
• Australian Square Kilometre Array Pathfinder: I. System Description
• A radio transient with unusually slow periodic emission
• A Flare-Type IV Burst Event from Proxima Centauri and Implications for Space Weather
• A circular polarisation survey for radio stars with the Australian SKA Pathfinder
• Stellar magnetosphere reconstruction from radio data. Multi-frequency VLA observations and 3D-simulations of CU Virginis
• ASKAP Detection of Periodic and Elliptically Polarized Radio Pulses from UV Ceti
• Discovery of Five Recycled Pulsars in a High Galactic Latitude Survey
• Wideband Dynamic Radio Spectra of Two Ultra-cool dwarfs
• Direct radio discovery of a cold brown dwarf
• The very nearby M/T dwarf binary SCR 1845-6357
• Discovery of ASKAP J173608.2-321635 as a Highly-Polarized Transient Point Source with the Australian SKA Pathfinder
• A comprehensive search for the radio counterpart of GW190814 with the Australian Square Kilometre Array Pathfinder
• 21 new long-term variables in the GX 339-4 field: two years of MeerKAT monitoring
• VLA multifrequency observations of RS CVn binaries
• ASKAP observations of multiple rapid scintillators reveal a degrees-long plasma filament
• The Deeper, Wider, Faster Program: Exploring stellar flare activity with deep, fast cadenced DECam imaging via machine learning
• Wide-Band Spectral Variability of Peaked Spectrum Sources
• A pilot ASKAP survey for radio transients towards the Galactic Centre
• Searching for stellar flares from low mass stars using ASKAP and TESS
• Limits on the Mass, Velocity and Orbit of PSR J1933$-$6211
• The ASKAP Variables and Slow Transients (VAST) Pilot Survey
• Radio Emission from UV Cet: Auroral Emission from a Stellar Magnetosphere

Cited by in corpus (2)

• Commensal Transient Searches in Eight Short Gamma Ray Burst Fields
• Mining the time axis with TRON. I. Millisecond pulsars in Omega Centauri, Terzan 5 and 47 Tucanae detected through MeerKAT interferometric imaging