AstroNote 2021-13

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2021-01-12 11:12:11
Type: Object/s-Discovery/Classification
Asiago spectroscopic classification of optical transients
Authors: L. Tomasella, S. Benetti, E. Cappellaro (INAF OAPd)
Source Group: Padova-Asiago
We report the spectroscopic classification of the following transients: AT2021xm as a Galactic CV; AT2021tf as a quasar.

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of AT2021xm and AT2021tf.

Targets were supplied by Zwicky Transient Facility ZTF, Bellm et al. 2019 2019PASP..131a8002B; ).

The observations were  obtained with the Asiago 1.82m Copernico Telescope (+ AFOSC; range 340-820 nm; resolution 1.4 nm).

AT2021xm:  The noisy spectrum shows a blue continuum. The emission core of Halpha (surrounded by broad absorption troughs) at zero redshift is clearly detectable.  The spectrum resembles that of Galactic CVs after the outburst.

AT2021tf: The object is a quasar. The spectrum shows broad emission lines which are identified with CIII]  and CII] features if a redshift of about z ~1.54 is assumed.

The Asiago classification spectra are posted at the website and the IAU Transient Name Server.

The classified objects are listed in the Related Objects table below.


Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2021xm [ZTF19aceviuo]04:04:25.556+70:36:31.93CV04:04:25.556+70:36:31.93CV
TNS2021tf [ZTF21aabpnlm]23:56:05.113+53:43:46.37QSO1.5423:56:05.110+53:43:46.60QSO1.54