AstroNote 2020-9

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DRAFT
2020-01-11 16:47:36
Type: Object/s-Data/Analysis
An Initial Analysis of the VLA Observation of the Nearby Supernova SN2020oi in M100
Authors: Assaf Horesh, Itai Sfaradi (HUJI)
Abstract:
We report our initial analysis of the Jansky Very Large Array (VLA) observation of the nearby (~17 Mpc) supernova SN2020oi in M100 (TNS report 58241; ATel #13393; TNS report 5875; ATel # 13391; Astronote 2020-8). While it is difficult to determine whether SN radio emission is detected in the image due to nearby other radio sources and the low spatial resolution of the image, the structure of the complex resolved radio sources in the images hints towards the possible presence of SN emission.

We report our initial analysis of the Jansky Very Large Array (VLA) observation of the nearby (~17 Mpc) supernova SN2020oi in M100. SN2020oi was discovered by the Zwicky Transient Facility (ZTF; ATel #11266), reported by the ALeRCE broker (TNS report 58241, Forster et al.), and classified as a Type Ic SN by Siebert et al. (ATel #13393; see also ATel # 13391 for early photometry by Ho et al.). The VLA has initiated a public observation of SN2020oi on 2020 January 10. The observation was conducted at 10 GHz (X-band) in the D configuration. We performed an initial analysis of the data using the 3C286 as a flux calibrator and J1224+2122 as a gain calibrator.

The VLA image of the position of SN2020oi reveals a somewhat resolved source. Comparison to the FIRST catalog indicates two previously detected radio sources within 10” of the SN position at a peak flux level of ~3 mJy. Due to limited resolution in D configuration, the detection of radio emission from the SN cannot be determined with high confidence at this time. However, comparison of the FIRST image with the VLA image of the SN position (and the structure of the resolved emission) hints towards an additional new component north (and west) of the two radio sources previously discovered in FIRST, towards the position of the SN. This may be an indication of radio emission from SN2020oi. A more detailed analysis may help to confirm this.

We encourage further radio observations with the VLA and other facilities.

We thank the VLA and NRAO staff for scheduling and performing this public observation.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020oi [ZTF20aaelulu]12:22:54.925+15:49:25.05SN Ic0.005MESSIER 1000.0052412:22:54.919+15:49:24.98SN Ic0.0052