KITS Spectroscopic Classification of AT 2022mxv as a Type II SN with Keck II + NIRES
ATel #15464; K. W. Davis, S. Tinyanont, R. J. Foley (UCSC), R. Chornock (UCB)
on 24 Jun 2022; 04:49 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Samaporn Tinyanont (stinyanont@ucsc.edu)
Subjects: Infra-Red, Supernovae
We report a classification of AT 2022mxv from spectroscopic observations with the NIRES spectrograph on the Keck II telescope, made on 2022 Jun 22 UT as part of the Keck Infrared Transient Survey (KITS), a NASA Keck Strategic Mission Support program. The target was supplied by ATLAS.
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
ATLAS22qxp | AT2022mxv | 23:51:05.11 | +20:09:08.75 |0.014046| II | pre-peak | (1)
Notes:
(1) We detect a continuum in the NIR with emission lines from H Brackett gamma (2.17 micron), Paschen beta (1.28 micron) and Paschen gamma (1.09 micron), as well as He I 1.083 micron. The lines have Lorentzian profiles with the FWHM ~ 2000 km/s (fitted from the isolated Paschen beta line), indicating that the lines may be forming in the ionized CSM. We also detect an absorption likely from the He I 2.06 micron line at -500 km/s. The redshift is of the host galaxy NGC 7769 obtained from NED.
