AstroNote 2020-85

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2020-04-17 22:08:47
Type: Object/s-Discovery/Classification
Spectroscopic classification of the intrinsically faint optical transient AT 2020hdh as Type Ic supernova
Authors: Andreoni Igor (Caltech), Kishalay De (Caltech), Anastasios Tzanidakis (Caltech), Mansi M. Kasliwal (Caltech)
Source Group: ZTF
We observed with P60/SEDM the intrinsically faint optical transient AT2020hdh, discovered during the the "Pan-STARRS Search for Kilonovae" and also found as part of the "Census of the Local Universe" experiment with ZTF. The spectrum of AT2020hdh is consistent with a Type Ic supernova at redshift z=0.012.
The intrinsically faint transient AT2020hdh was discovered on 2020-04-12 using Pan-STARRS1 as part of the "Pan-STARRS Search for Kilonovae" (Smartt et al. AstroNote 20-83; Smartt et al. AstroNote 2019-48). The transient was also identified with the Zwicky Transient Facility (ZTF; Bellm et al. 2019, Graham et al. 2019) and saved as part of the "Census of the Local Universe" experiment (De et al. Astronote 2019-124, De et al. ATel 13546).


We observed AT2020hdh with the Spectral Energy Distribution Machine (SEDM; Blagorodnova et al. 2018) mounted on Palomar 60-inch telescope (P60; Cenko et al. 2006) on 2020-04-16. The spectrum shows deep O I and Ca II features at z=0.012 that suggest the transient to be a Type Ic supernova (SN Ic). H-alpha and H-beta lines are also detected, but they are consistent with being narrow lines from the star-forming host galaxy at the resolution of P60/SEDM. We found a good match to the SN Ic 2004aw at the host redshift running SNID (Blondin & Tonry 2007) on the spectrum after clipping galaxy lines.
Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020hdh14:32:38.475+31:40:15.64SN Ic0.01214:32:38.475+31:40:15.64SN Ic0.012