A circular polarization survey for radio stars with the Australian SKA Pathfinder

Author:

Pritchard Joshua123ORCID,Murphy Tara13ORCID,Zic Andrew12ORCID,Lynch Christene45ORCID,Heald George6ORCID,Kaplan David L7ORCID,Anderson Craig28,Banfield Julie2ORCID,Hale Catherine6ORCID,Hotan Aidan6,Lenc Emil2ORCID,Leung James K123ORCID,McConnell David2,Moss Vanessa A12,Raja Wasim2,Stewart Adam J1ORCID,Whiting Matthew2

Affiliation:

1. Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia

2. CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia

3. ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Hawthorn, VIC 3122, Australia

4. International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6845, Australia

5. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO3D), Bentley, WA 6845, Australia

6. CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia

7. Department of Physics, University of Wisconsin – Milwaukee, Milwaukee, Wisconsin 53201, USA

8. National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA

Abstract

ABSTRACT We present results from a circular polarization survey for radio stars in the Rapid ASKAP Continuum Survey (RACS). RACS is a survey of the entire sky south of δ = +41○ being conducted with the Australian Square Kilometre Array Pathfinder telescope (ASKAP) over a 288 MHz wide band centred on 887.5 MHz. The data we analyse include Stokes I and V polarization products to an RMS sensitivity of 250 μJy PSF−1. We searched RACS for sources with fractional circular polarization above 6 per cent, and after excluding imaging artefacts, polarization leakage, and known pulsars we identified radio emission coincident with 33 known stars. These range from M-dwarfs through to magnetic, chemically peculiar A- and B-type stars. Some of these are well-known radio stars such as YZ CMi and CU Vir, but 23 have no previous radio detections. We report the flux density and derived brightness temperature of these detections and discuss the nature of the radio emission. We also discuss the implications of our results for the population statistics of radio stars in the context of future ASKAP and Square Kilometre Array surveys.

Funder

Australian Research Council

National Science Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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