AstroNote 2020-100

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DRAFT
2020-05-07 08:45:57
Type: Object/s-Discovery/Classification
Classification of SN 2020jfo (ZTF20aaynrrh) as a young Type II supernova
Authors: Daniel Perley (LJMU), Cristina Barbarino (Stockholm), Jesper Sollerman (Stockholm), Tassilo Schweyer (Stockholm), Steve Schulze (Weizmann), Kirsty Taggart (LJMU)
Keywords: Supernova
Abstract:
We classify SN 2020jfo in M61 as a young Type II supernova using spectra from the Nordic Optical Telescope, Liverpool Telescope, and Palomar 60-inch telescope.

AT2020jfo is a young, rising supernova in the nearby spiral galaxy M61 (Schulze et al., AstroNote 2020-99).  During the 24 hours following its discovery we obtained three optical spectra using the Nordic Optical Telescope (ALFOSC) and Liverpool Telescope (SPRAT) on La Palma and with the 60-inch Telescope (SEDM) at Palomar Observatory.  The ALFOSC spectrum was taken using grism 4. 

All three spectra are dominated by a blue and very hot continuum with weak features.  The most prominent of these is a broad P-cygni like feature centered at approximately 4500 Angstroms, likely blueshifted helium.  The spectra also consistently show a weaker but significant broad feature at 6500 Angstroms, likely H-alpha.

Anaysis of the spectra using SNID (Blondin & Tonry 2007, 2007ApJ...666.1024B) shows a good match to SN 1999gi, a Type IIP SN, about 7 days before maximum light.  We suggest that SN 2020jfo is a young Type II supernova.

We thank Teet Kuutma and the NOT staff for obtaining these service observations.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020jfo [ZTF20aaynrrh]12:21:50.479+04:28:54.14SN II12:21:50.483+04:28:54.15SN II0.00502