DRAFT
2025-05-22 15:25:01
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: A. Aryan (NCU, Taiwan), S. P. Cosentino (University of Catania), C. F. Aster (Cardiff), M. Dennefeld (IAP), E. Concepcion (Nova Gorica), S. Faris (Tel Aviv), Y.-H. Lee, C.-H. Lai, M.-H. Lee, T.-W. Chen (NCU, Taiwan), J. Anderson (ESO), T. Müller Bravo (Southampton), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), P. J. Pessi (Stockholm), O. Yaron (Weizmann), D. R. Young (QUB), J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt, K. W. Smith (Oxford/QUB), S. Srivastav, H. Stevance (Oxford), 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 4 Ia's, 2 II's, 3 CV's, 1 Ia-91T, and 1 Ia-CSM. 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), by 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), by the Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD), by the BlackGEM telescope array (Groot et al. 2024PASP..136k5003G),  by the DECam Survey of Intermediate Redshift Transients (DESIRT, Palmese et al. 2022 2022TNSAN.107....1P),  and by the Xingming Observatory Sky Survey (XOSS).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2025 May 21, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3380-7520A, 16A resolution). Classifications were done using NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H) and DASH (Muthukrishna et al. 2019  2019ApJ...885...85M).

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 Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025ivk [KATS25H016] 11:01:09.879 +12:13:08.57 SN Ia-91T-like 0.13 SDSS J110110.08+121306.7 Redshift from template match. Good match with Type Ia-91T-like using NGSF and ASTRODASH. 11:01:09.879 +12:13:08.57 SN Ia-91T-like 0.13
TNS 2025kua [ZTF25aaqbltp] 11:20:52.404 -03:59:48.83 SN II 0.025 LCRS B111819.4-034320 Spectroscopic redshift from host. Good match with Type II using NGSF. 11:20:52.404 -03:59:48.83 SN II 0.025
TNS 2025kwj [T202505171246001m123615] 12:46:00.134 -12:36:15.04 CV 0 Typical hot/blue continue. Characteristic Balmer series is seen in spectrum. 12:46:00.134 -12:36:15.04 CV
TNS 2025kny [ZTF25aaqkvza] 12:40:41.831 -07:39:19.59 SN Ia 0.073 WISEA J124041.75-073919.8 Redshift derived from host H-alpha emission line in spectrum. Good match with Type Ia using ASTRODASH and NGSF. 12:40:41.831 -07:39:19.59 SN Ia 0.073
TNS 2025kxp [BGEM J132117.36-434610.9] 13:21:17.369 -43:46:10.91 CV 0 Typical hot/blue continue. Characteristic Balmer series is seen in spectrum. 13:21:17.369 -43:46:10.91 CV
TNS 2025kpa [ZTF25aaqgddb] 14:50:51.527 -19:08:05.55 SN Ia-91T-like 0.07 WISEA J145051.53-190806.1 Redshift from template match. Good match with Type Ia-91T-like using ASTRODASH and NGSF. 14:50:51.527 -19:08:05.55 SN Ia-91T-like 0.07
TNS 2025kyh [ZTF25aaqxyfn] 17:05:32.895 -08:39:27.94 SN II 0.024 WISEA J170532.93-083910.1 Spectroscopic redshift from host. Good match with Type II using NGSF. 17:05:32.895 -08:39:27.94 SN II 0.024
TNS 2025kxe [GOTO25cul] 16:08:46.277 +01:53:38.19 SN Ia 0.095 WISEA J160846.67+015338.3 Spectroscopic redshift from host. Good match with Type Ia using ASTRODASH and NGSF. 16:08:46.277 +01:53:38.19 SN Ia 0.095
TNS 2025kvd [ZTF25aaqvwgk] 20:15:17.388 -12:29:26.61 CV 0 The transient is close to LEDA 952071. However, characteristic Balmer series is seen in spectrum referring a CV. Typical hot/blue continue. 20:15:17.388 -12:29:26.61 CV
TNS 2025khv [ATLAS25exk] 23:11:16.603 -32:27:18.26 SN Ia 0.037 IC 5289 NED02 Spectroscopic redshift from host. Good match with Type Ia using ASTRODASH and NGSF. 23:11:16.603 -32:27:18.26 SN Ia 0.037
TNS 2025kxz [ZTF25aarajhz] 20:25:43.605 -19:44:00.62 SN Ia-CSM 0.15 WISEA J202543.10-194358.4 Redshift from template match. Good match with Type Ia-CSM using ASTRODASH and NGSF. 20:25:43.596 -19:44:00.60 SN Ia-CSM 0.15

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