DRAFT
2024-03-14 15:01:42
Type: Object/s-Discovery/Classification
Bibcode: 2024TNSAN..74....1T
ePESSTO+ spectroscopic classification of optical transients
Authors: S. Taubenberger, C. Vogl (MPA/TUM), G. Csoernyei (MPA), S. Blondin (LAM/ESO), J. Terwel (TCD), E. Concepcion, M. Bronikowski (Nova Gorica), T.-W. Chen (NCU), S. Benetti (INAF-OAPd), J. Anderson (ESO), 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, 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 1 Type Ia SN, 2 Type II SN, 1 TDE (AT2024eff), and another possible TDE (AT2024dbc). AT2024eff displays broad and narrow emission-line components on top of a blue continuum (another possible interpretation would be a type I Seyfert AGN, although the light curve is atypical), while AT2024dbc displays a blue continuum and is coincident with the nucleus of its host galaxy (z=0.145). 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.

Targets were supplied by the ATLAS survey (Smith et al. 2020 2020PASP..132h5002S) and by the ESA Gaia Photometric Science Alerts Team DPAC.

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2024 March 13, 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 2024eff [Gaia24axr] 05:51:41.890 -19:13:06.24 TDE 0.059 LEDA 858238 0.059 Gaia Another possible interpretation would be a type I Seyfert AGN, although the light curve is atypical. Redshift derived from numerous emission lines is z=0.059, consistent with that reported in NED for the host galaxy (LEDA 858238). 05:51:41.890 -19:13:06.24 AGN 0.059
TNS 2024dbc [ATLAS24cby] 13:54:51.310 +02:44:38.26 Other 0.145 SDSS J135451.31+024438.2 0.145 ATLAS blue continuum. TDE? Redshift from [OII] and Hbeta consistent with redshift in NED z=0.145. 13:54:51.310 +02:44:38.26 SN IIn 0.145
TNS 2024byk [ATLAS24ccu] 15:28:42.438 -00:41:22.71 SN Ia 0.07 ATLAS +20 SNID provides a best-match to the normal Type Ia SN 2005na at +20 days from maximum light at z=0.07. No known host-galaxy redshift. 15:28:42.438 -00:41:22.71 SN Ia 0.07
TNS 2024eek [ATLAS24doa] 18:37:56.111 -62:31:34.09 SN II 0.015 0.015 ATLAS at max SNID provides a best-match to the Type IIP SN 1999em at -3 days from maximum light (one week post explosion) at z=0.013+/-0.005, consistent with the known host-galaxy redshift z=0.015. 18:37:56.135 -62:31:34.68 SN II 0.015
TNS 2024dgo [ATLAS24cvw] 19:02:32.963 -36:21:23.31 SN II 0.018 ESO396-G016 0.018 ATLAS +83 SNID provides a best-match to the Type IIP SN 2004et at +83 days from maximum light at z=0.018+/-0.002, consistent with the known host-galaxy redshift z=0.018. 19:02:32.963 -36:21:23.31 SN II 0.018

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