JVLA radio detection of SN Ia 2020eyj
ATel #16080; Xiaolong Yang (SHAO, China), Zhengwei Liu (YNAO, China), Huanyuan Shan (SHAO, China), Xiangcun Meng (YNAO, China), Bo Zhang (SHAO, China), Jun Yang (OSO/Chalmers University of Technology, Sweden)
on 11 Jun 2023; 14:13 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaolong Yang (yangxl@shao.ac.cn)
Subjects: Radio, Supernovae
Following the identification of the first radio-detected SN Ia 2020eyj (Kool et al. 2023), we report individual and further radio observational results with Karl G. Jansky Very Large Array (JVLA). We obtained two datasets from the NRAO archive, which were observed on 2022 April 14 (Project Code: 22A-472; PI: Javier Moldon) and June 26 (Project Code: 22A-497; PI: Javier Moldon), i.e. 767 and 840 days since discovery, respectively. Both observations were conducted at C-band (the central frequency is 6 GHz) with a bandwidth of 2 GHz. These observations yield clear detection of a radio source at the position of SN 2020eyj with peak flux densities 62.9 +- 8.2 and 63.0 +- 10.1 microJy, respectively. We transfer the 6 GHz peak flux density to 5.1 GHz via the measured in-band spectral indexes and find no evidence for statistically significant radio luminosity decline by comparing JVLA with e-MERLIN observations (see the attached Figure, https://drive.google.com/file/d/1gWQ1_--4EmIIAF9P00tp6RKS9y7QN4vS/view?usp=sharing). Further observations are proposed to unveil the radio evolution.
