Spectroscopic classification of Type II SNe 2020whv and 2020xua with MMT and Binospec

ATel #14115; G. Terreran, W. Jacobson-Galan, P. K. Blanchard (Northwestern University)
on 23 Oct 2020; 01:20 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Giacomo Terreran (giacomo.terreran@northwestern.edu)

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We report the spectroscopic classification of SNe 2020whv and 2020xua as two Type II supernovae. The objects were discovered by the Zwicky Transient Facility (Kulkarni 2018; ATel #11266) and by ATLAS (Tonry et al. 2016; ATel #8680).

The observation was performed with Binospec, mounted on the 6.5m MMT telescope (range 385-920 nm; resolution 0.4 nm).

 
 
Survey Name   |  IAU Name   |   Discovery MJD  | Discovery mag |    z    |  Type  |       Phase       | Notes 
ZTF20aciuciv  | SN 2020whv  |    59135.47      |     19.6      | 0.097   |   II   |        at max     | (1)   
ATLAS20befn   | SN 2020xua  |    59143.34      |     18.1      | 0.022   |   II   |  ~days after exp. | (2)   

(1) The spectrum shows a blue continuum with possibly broad features from the Balmer series. We measure a tentative expansion velocity of 8400 km/s from the minimum of the Hbeta shallow absorption. The redshift is measured from narrow lines coming from the host galaxy.

(2) The spectrum shows a blue continuum with “shock-ionized” H, He II and C IV emission features, typical of young core-collapse SNe in the first days after explosion.