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Radio constraints on the mass-loss rate of the Type Ia SN 2018gv

ATel #11211; S. D. Ryder (AAO), P. Lundqvist (Stockholm University), M. A. Perez-Torres (IAA-CSIC), E. Kundu (Stockholm University), E. C. Kool (Macquarie University/AAO), C.-I. Bjornsson (Stockholm University), C. Fransson (Stockholm University)
on 21 Jan 2018; 23:47 UT
Credential Certification: Stuart Ryder (sdr@aao.gov.au)

Subjects: Radio, Supernovae, Transient

Referred to by ATel #: 11324

The young Type Ia SN 2018gv (ATel #11175, #11177) in the galaxy NGC 2525 has been observed with the Australia Telescope Compact Array (ATCA) at 5.5 and 9.0 GHz on 2018 Jan 18.6 UT. No radio emission was detected at the reported location, to a 3-sigma upper limit of 120 microJy/beam (5.5 GHz) and 30 microJy/beam (9.0 GHz). Adopting the host galaxy distance from Tully et al. (2013, AJ, 146, 86) of 16.8 Mpc, this implies an upper limit on the 9.0 GHz luminosity of 1.0E25 erg/s/Hz. Using the same model as in ATel #10168 for SN 2016coj, and assuming that we observed SN 2018gv 12 days after explosion, this corresponds to an upper limit on the wind mass loss rate of the supernova progenitor of 1.9e-8 solar masses per year (3-sigma) for an assumed wind speed of 100 km/s. We would like to extend our thanks to the ATCA staff for enabling these observations. The Australia Telescope Compact Array is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.