DRAFT
2024-03-07 16:03:56
Type: Object/s-Discovery/Classification
Bibcode: 2024TNSAN..66....1T
ePESSTO+ spectroscopic classification of optical transients
Authors: S. Taubenberger, C. Vogl (MPA/TUM), G. Csoernyei (MPA), S. Blondin (LAM/ESO), L. Galbany (ICE), T. Killestein (Turku), A. Gkini (OKC/SU), 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, M. Fulton, M. McCollum, T. Moore, 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 two young Type Ia SNe and one Type II SN, and two highly uncertain classifications: AT2024alt is a possible broad-line SN Ic at a redshift z~0.03, while AT2024byt displays a few broad features possibly consistent with a broad-line SN Ic at redshift z~0.2. Both AT2024alt and AT2024byt were reported as a SLSN candidates by ZTF (https://www.wis-tns.org/astronotes/astronote/2024-62).

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 Pan-STARRS Survey for Transients (Chambers et al. 2016 2016arXiv161205560C), the Zwicky Transient Facility ZTF (Bellm et al. 2019 2019PASP..131a8002B) - data stream processed through the Lasair broker (Smith, Williams, Young et al. 2019 2019RNAAS...3...26S) and by the ALeRCE broker (Forster et al. 2020 2021AJ....161..242F), and the Gravitational-wave Optical Transient Observer (GOTO, see Dyer et al. 2020, SPIE, 11445; http://goto-observatory.org/).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2024 March 6, using EFOSC2 and Grisms 13 (3985-9315A, 18A resolution) and 11 (3380-7520, 13.8A 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 2024dwn [ZTF24aaguabz] 14:07:56.900 -23:11:15.48 SN Ia 0.043 0.043 ZTF <-10 SNID provides a best-match to the normal Type Ia SN 2003du at -13 days from maximum light at z=0.046+/-0.003, consistent with the host-galaxy redshift z=0.043 derived from narrow Halpha emission (visible in SN spectrum and present in 2D spectrum). 14:07:56.900 -23:11:15.65 SN Ia 0.043
TNS 2024djz [GOTO24up] 13:53:38.840 +21:20:49.29 SN Ia 0.028 SDSS J135338.83+212042.7 0.028 GOTO -7 to -4 SNID provides a best-match to the normal Type Ia SN 2007F at -6 days from maximum light at z=0.029+/-0.002, consistent with the known host-galaxy redshift z=0.028 from NED. 13:53:38.840 +21:20:49.06 SN Ia 0.028
TNS 2024dxh [ZTF24aagtqam] 14:02:08.630 -08:03:46.58 SN II 0.02 SDSS J140208.61-080345.5 0.02 ZTF at max SNID provides a best-match to the Type IIP SN 2004et at -1 day from maximum (~15 days post explosion) at z=0.021+/-0.004, reported here as z=0.02. No known host redshift. 14:02:08.630 -08:03:46.58 SN II 0.02
TNS 2024alt [ZTF24aacfsyl] 08:30:42.420 +05:28:43.92 Other ZTF Possible broad-line SN Ic at z~0.03? No known host redshift. Reported as a SLSN candidate by ZTF (https://www.wis-tns.org/astronotes/astronote/2024-62). 08:30:42.420 +05:28:43.92
TNS 2024byt [PS24anc] 11:08:34.260 -00:30:23.81 Other Pan-STARRS Possible broad-line SN Ic at z~0.2? No known host redshift. Reported as a SLSN candidate by ZTF (https://www.wis-tns.org/astronotes/astronote/2024-62). 11:08:34.260 -00:30:23.81 SLSN-I 0.33

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