DRAFT
2024-12-06 17:03:42
Type: Object/s-Discovery/Classification
Bibcode: 2024TNSAN.356....1S
ePESSTO+ spectroscopic classification of optical transients
Authors: R. Santos, J. Duarte (Lisbon), M. Ghendrih, A. Milligan, G. Dimitriadis, L. Makrygianni, M. Smith (Lancaster), M. Fulton (QUB), A. Reguitti (INAF-OAPd), S. Srivastav (Oxford), J. Sollerman (SU), S. Benetti (INAF), O. Yaron (Weizmann), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), P. Pessi (Stockholm), D. Young (QUB), E. Zimmerman (Weizmann), 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, 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 6 Type Ia's, 1 Type IIb, 1 Type Ic-BL and 1 SN of uncertain type. SN2024acyl is a young SN. Its spectrum exhibits prominent He II 4686, resembling either a young type Ibn or late flash features. This transient is offset by 34kpc from its host galaxy. We encourage followup observations.

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), the Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD), the Xingming Observatory Sky Survey (XOSS) and the BlackGEM telescopes array (see Groot et al. 2024, PASP, 2024PASP..136k5003G)

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2024 Dec 05, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3380-7520A, 16A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B), GELATO (Harutyunyan et al. 2008 2008A&A...488..383H), Superfit (Howell et al. 2005 2005ApJ...634.1190H) and NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H).

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 2024acyl [ATLAS24qxm] 02:46:05.338 +28:01:17.88 SN 0.027 CGCG 505-052 0.026532 young Spectrum exhibits prominent He II 4686, consistent with either flash features or early Ibn. Redshift matches that of nearby galaxy (from NED) 02:46:05.326 +28:01:17.91 SN Ibn 0.027
TNS 2024abld [ATLAS24qfz] 22:37:23.842 -57:43:07.80 SN IIb 0.038 0.037846 Spectrum exhibits HeI (6678A, 7065A) and HeII (5876A) beyond the Balmer series. Redshift from host galaxy available in NED 22:37:23.842 -57:43:07.80 SN IIb 0.038
TNS 2024acdn [ATLAS24qnq] 23:22:29.058 -37:01:32.30 SN Ia 0.06 –3 to +3 Redshift derived from template fitting using SNID 23:22:29.026 -37:01:31.76 SN Ia 0.06
TNS 2024abqq [GOTO24ihm] 00:43:52.789 -33:43:39.21 SN Ia 0.088 0.0876 +4 to +7 Redshift from host galaxy available in NED 00:43:52.789 -33:43:39.21 SN Ia 0.088
TNS 2024abzp [BGEM J024240.07-152315.8] 02:42:40.073 -15:23:15.81 SN Ia 0.11 +4 to +7 Redshift derived from template fitting using SNID 02:42:40.073 -15:23:15.81 SN Ia 0.11
TNS 2024acgp [GOTO24ilg] 05:01:20.210 -55:16:07.23 SN Ia 0.035 0.034901 –7 to –4 Redshift from host galaxy available in NED 05:01:20.210 -55:16:07.23 SN Ia 0.035
TNS 2024abex [GOTO24igk] 06:04:23.290 -45:12:05.69 SN Ia 0.042 0.041679 –3 to +3 Redshift from host galaxy available in NED 06:04:23.290 -45:12:05.69 SN Ia 0.042
TNS 2024actb [ATLAS24qve] 06:40:08.933 -22:18:46.54 SN Ia 0.06 –3 to +3 Redshift derived from template fitting using SNID 06:40:08.924 -22:18:46.24 SN Ia 0.06
TNS 2024acsd [PSP24ac] 09:36:20.504 +23:45:00.39 SN Ic-BL 0.022 NGC 2927 0.025147 –7 to –4 Redshift from host galaxy available in NED 09:36:20.503 +23:45:00.33 SN Ic-BL 0.021748

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