Spectroscopic classification of SN 2019pqh by NUTS2, and implications for the claimed association with IceCube-190922B
ATel #13133; A. Reguitti (Univ. Andres Bello), A. Pastorello, S. Benetti, Y.-Z. Cai, E. Cappellaro, A. Fiore, N. Elias-Rosa, L. Tomasella (INAF-OAPd), G. Valerin, P. Ochner (Padova University), A. Morales-Garoffolo (UCA), M. Stritzinger, S. Holmbo (Univ. of Aarhus), S. Moran (NOT), S. Brennan, E. Callis, M. Fraser (UCD), E. Kankare, R. Kotak, H. Kuncarayakti, T. Heikkila, S. Mattila, T. Reynolds (Univ. of Turku), P. Lundqvist (Stockholm Univ.), S. Dong, P. Chen, S. Bose (KIAA-PKU)
on 26 Sep 2019; 13:51 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Andrea Pastorello (andrea.pastorello@oapd.inaf.it)
Subjects: Optical, Neutrinos, Supernovae, Transient
The Nordic Optical Telescope (NOT) Unbiased Transient Survey 2 (NUTS2; Atel #12661) reports the spectroscopic classification of SN 2019pqh in the host galaxy 2MASX J00262847-0107513. The candidate was discovered by the Zwicky Transient Facility (ZTF) and announced as a possible optical counterpart of the neutrino event IceCube-190922B detected on 2019-09-22.96106 UT (ATel #13125).
The observation was performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC (range 350-950 nm; resolution 1.75 nm FWHM).
Survey Name | IAU Name | Discovery (UT) | Discovery mag | First detection (UT) | Spectroscopic observation (UT) | Redshift | Type | Phase | Notes
ZTF19abxtupj | SN 2019pqh | 2019-09-07.399 | 20.31 (r-ZTF) | 2019-09-04.401 | 2019-09-26.00 | 0.134 | II/IIb | after max | (1)
(1) The spectrum is that of an evolved type II/IIb SN, dominated by strong Balmer lines with P Cygni profiles; Ca II H&K, Na I/He I and Fe II lines are also clearly detected. An association with IceCube-190922B was proposed by ATel #13125, under the assumption of strong interaction between SN ejecta and circumstellar medium (CSM). However, given the lack of clear spectral signatures of ejecta-CSM interaction, we are inclined to rule out such an association. However, we note that the absolute magnitude of the SN (<~ -19) is quite unusual for an evolved type II SN.
The classification was performed using the GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools.