ATCA and ASKAP radio observations of classical nova YZ Ret
ATel #15264; Ashna Gulati (U. Sydney), Tara Murphy (U. Sydney), Yuanming Wang (U. Sydney), James Leung (U. Sydney), Joshua Pritchard (U. Sydney), Emil Lenc (CSIRO), David Kaplan (UWM)
on 7 Mar 2022; 08:38 UT
Credential Certification: Tara Murphy (tara.murphy@sydney.edu.au)
Referred to by ATel #: 15301
Following multi-wavelength observations of classical nova YZ Ret (see ATels #13867, #13868, #14124, #14043, #14048), associated with known cataclysmic variable MGAB-V207 and identified by R. H. McNaught on 2020 July 15.590 (CBET #4811), we initiated radio observations centred on its Gaia optical position.
The radio observation with the Australia Telescope Compact Array (ATCA) took place on 2022 February 6 (568 days post-discovery in optical) at frequencies 2.1, 5.5 and 9.0 GHz, and the source was detected at all three observed frequencies.
An earlier radio observation with Australian Square Kilometre Array Pathfinder (ASKAP) was taken as part of the Rapid ASKAP Continuum Survey (RACS; McConnell et al. 2021). The observation on 2022 January 25 (559 days post-discovery in optical) , shows a marginal detection with an SNR of 3.2 at 1.65 GHz. Earlier radio observations taken as part of the ASKAP Variable And Slow Transients survey (VAST; Murphy et al. 2021), with multiple epochs from 2020 August 29 to 2021 August 22, show non-detections for the source.
We report our radio detections and 3-sigma upper limits below:
| Date (UTC) | Telescope | Freq (GHz) | Flux Density (mJy) |
|---|
| 2020-08-29 | ASKAP | 0.888 | < 0.69 |
| 2021-01-24 | ASKAP | 1.367 | < 0.51 |
| 2021-07-24 | ASKAP | 0.888 | < 0.58 |
| 2021-08-22 | ASKAP | 0.888 | < 0.58 |
| 2022-01-25 | ASKAP | 1.655 | 0.63 +/- 0.19 |
| 2022-02-06 | ATCA | 2.868 | 1.43 +/- 0.15 |
| 2022-02-06 | ATCA | 5.500 | 1.80 +/- 0.04 |
| 2022-02-06 | ATCA | 9.000 | 1.67 +/- 0.03 |
We thank CSIRO staff for supporting these observations.
