DRAFT
2024-03-08 16:39:42
Type: Object/s-Discovery/Classification
Bibcode: 2024TNSAN..69....1V
ePESSTO+ spectroscopic classification of 2 optical transients
Authors: C. Vogl, S. Taubenberger, (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, 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), T.-W. Chen (TUM/MPA), C. Stubbs (Harvard)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes the classification of AT2024ddk, a highly-reddened Type Ia SN around one week past maximum light, and an updated classification of AT2024ut, whose spectrum on UT 2024 Jan 17 initially displayed a blue featureless continuum. This new spectrum now displays features consistent with a SLSN-I at an approximate redshift z~0.24. Follow-up observations are encouraged.

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

The 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 7, 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 2024ddk [ATLAS24cts] 15:46:37.540 -13:22:39.18 SN Ia 0.026 2MFGC 12682 0.026 ATLAS +6 highly-reddened SN Ia around one week past maximum light. SNID provides a best-match to the normal Type Ia SN 2007nq at +6 days from maximum light at z=0.028+/-0.003, consistent with the known host-galaxy redshift z=0.026 from NED. 15:46:37.540 -13:22:39.65 SN Ia 0.026
TNS 2024ut [ATLAS24apr] 12:14:11.133 -25:07:54.81 SLSN-I 0.24 ATLAS > +20 No known host redshift. GELATO provides a decent match to the SLSN CSS121015:004244+132827 (Benetti et al. 2014) at +50 days past maximum light and at a redshift z~0.24. A earlier spectrum from UT 2024 Jan 17 displayed a blue featureless continuum (see https://www.wis-tns.org/astronotes/astronote/2024-24). 12:14:11.133 -25:07:54.81 SLSN-I 0.24

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