ASKAP detection of classical nova V6598 Sgr 2023

ATel #16383; D. Dobie (Swinburne, OzGrav), K. Rose (U. Sydney, CSIRO), D. Kaplan (UWM), G. R. Sivakoff (U. Alberta) on behalf of the VAST collaboration
on 16 Dec 2023; 06:32 UT
Credential Certification: Dougal Dobie (ddobie@swin.edu.au)

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We report the serendipitous discovery of unresolved radio emission from V6598 Sgr 2023 (ATel #16135 and others) with the Australian Square Kilometre Array Pathfinder as part of the Variables And Slow Transients (VAST) survey (Murphy et al. 2021).

We measure flux densities of
2023-10-16: 4.5 +/- 0.3 mJy/beam
2023-10-31: 4.3 +/- 0.3 mJy/beam
2023-11-18: 5.4 +/- 0.3 mJy/beam

All observations were conducted at a central frequency of 888 MHz with a bandwidth of 288 MHz and a typical integration time of 12 minutes and. The quoted uncertainties do not include the systematic flux scale uncertainty of approximately 10%.

This field (VAST1753-18) has been regularly observed since 2022-11-14 and we have not made any detections previously with a typical 5-sigma upper limit of 1.3 mJy. Our latest non-detection was on 2023-10-02. Thus significant low-frequency radio emission appeared at 79--93 days after the outburst began on 2023-07-15 We note that our radio data show a rising light curve, and we encourage further multiwavelength observations.

This field will continue to be monitored as part of regular VAST observations.

This work uses data obtained from Inyarrimanha Ilgari Bundara / the Murchison Radio-astronomy Observatory. We acknowledge the Wajarri Yamaji People as the Traditional Owners and native title holders of the Observatory site. CSIRO's ASKAP radio telescope is part of the Australia Telescope National Facility (https://ror.org/05qajvd42). The operation of ASKAP is funded by the Australian Government with support from the National Collaborative Research Infrastructure Strategy. ASKAP uses the resources of the Pawsey Supercomputing Research Centre. The establishment of ASKAP, Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy Observatory, and the Pawsey Supercomputing Research Centre are initiatives of the Australian Government, with support from the Government of Western Australia and the Science and Industry Endowment Fund.