DRAFT
2024-03-13 14:45:08
Type: Object/s-Discovery/Classification
Bibcode: 2024TNSAN..73....1C
ePESSTO+ spectroscopic classification of optical transients
Authors: G. Csoernyei (MPA), S. Taubenberger, C. Vogl (MPA/TUM), S. Blondin (LAM/ESO), J. Terwel (TCD), E. Concepcion, M. Bronikowski (Nova Gorica), T.-W. Chen (NCU), S. Benetti (INAF-OAPd), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (ICE), M. Nicholl (QUB), O. Yaron, E. Zimmerman (Weizmann), D. Young (QUB), J. Tonry, L. Denneau, H. Weiland, A. Lawrence, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt (Oxford/QUB), K. W. Smith, S. Srivastav, D. R. Young, M. Fulton, M. McCollum, T. Moore, M. Nicholl, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), C. Stubbs (Harvard)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of one young Type Ia SN (AT2024edz), a young flash-ionized Type II SN (AT2024ecr), and a young Type II SN (AT2024ecu). In addition, we re-classify AT2024dgy as a Type II SN at z~0.01 (which displayed a featureless blue continuum in a spectrum from 2024 March 5 UT).

ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the following supernova classifications.

Targets were supplied by the ATLAS survey (Smith et al. 2020 2020PASP..132h5002S).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2024 March 12, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) and GELATO (Harutyunyan et al. 2008 2008A&A...488..383H).

The classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

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

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2024edz [ATLAS24dnw] 11:36:04.799 -34:20:08.84 SN Ia 0.056 2MASXJ11360503-3420120 0.056 ATLAS -9 young SN Ia. SNID provides a best-match to the normal Type Ia SN 2005cf at -9 days from maximum light at z=0.05, consistent with the host-galaxy redshift z=0.056 from NED. 11:36:04.799 -34:20:08.84 SN Ia 0.056
TNS 2024ecr [ATLAS24dma] 13:39:26.112 -16:37:41.29 SN II 0.052 ATLAS young flash-ionized Type II SN. The spectrum displays the Balmer series in emission and a narrow Halpha P-Cygni profile, as well as He II 4686 Ang in emission. The inferred redshift from these narrow SN features is 0.052, although there is no clearly identified host galaxy. 13:39:26.122 -16:37:41.34 SN II 0.052
TNS 2024ecu [ATLAS24dmf] 18:55:13.934 -42:24:30.44 SN II 0.02 ATLAS -2 young SN II. SNID provides a best-match to the Type IIP SN 2005cs at -2 days from maximum (~4 days post explosion) and z=0.015+/-0.006. No known host redshift. 18:55:13.934 -42:24:30.44 SN II 0.02
TNS 2024dgy [ATLAS24cxn] 04:18:02.401 +01:22:00.57 SN II 0.01 ATLAS initial spectrum from UT 2024 March 5 showed a blue featureless continuum. The spectrum now displays features consistent with a Type IIn SN at 20-30 days post explosion and z=0.01 (GELATO matches with the type IIn SN 1998S at these epochs). No known host redshift. 04:18:02.411 +01:22:00.54 SN II 0.01

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