We report the observation of 16 transients using the Kast Double Spectrograph on the 3.05 meter C. Donald Shane telescope at the Lick observatory. Observations were obtained over 2 nights between MJD 60351.13 and MJD 60352.53.
On the red side detector the 300/7500 grating was used, which has a dispersion of 2.55 Å/pixel. On the blue side the 600/4310 grism was used, which has a dispersion of 1.02 Å/pixel. A slit width of 1.5" was used for all observations. Spectra were reduced using the UCSC Spectral Pipeline (Siebert et al. 2019). A spectral range of approximately 3590-10490 Å was obtained for the reduced spectra.
Of these 16 transients classifications were found for 12 objects, which includes 1 SLSN-I, 1 SN Ic, 1 SN IIb, 3 SN II and 6 SN Ia. Classifications were performed either by eye for obvious cases, or by fitting observations to template spectra from previously classified transients using Next Generation Superfit (NGSF, Goldwasser et al. 2022).
Details of each observed transient are summarised in the "Related Objects" table. Further follow-up observations are encouraged of targets for which we did not obtain a concrete classification. The spectra of observed unclassifed objects have been included in this Astronote.
| 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 | 2023aase [ZTF24aaaimkm] | 11:32:22.082 | -03:19:20.40 | SLSN-I | 0.2 | No obvious host features present. Redshift and classification obtained using matches to the NGSF SLSN-I template spectra from Gaia16apd, 2011keat, 2015bn and 2018bsz at z=0.2. | 11:32:22.070 | -03:19:20.50 | SLSN-I | 0.2 | ||
| TNS | 2024aci [ZTF24aaaeisk] | 01:46:53.608 | +34:52:15.80 | SN Ia | 0.07 | Galaxy dominated spectrum. Redshift obtained and classification performed using fits to the NGSF SN Ia template spectrum from PTF10ops at z=0.07. | 01:46:53.608 | +34:52:15.80 | SN Ia | 0.07 | ||
| TNS | 2023acbs [ZTF23abvnmam] | 02:44:05.102 | +16:40:08.87 | SN II | 0.0393 | Complex H-alpha P-Cygni profile present. | 02:44:05.109 | +16:40:08.93 | SN II | 0.0393 | ||
| TNS | 2024J [ZTF24aaabybk] | 08:27:25.640 | +03:28:49.79 | SN Ic | 0.0336 | Spectrum displays broad Ca II profile in the IR and no significant H, He or Si II features. | 08:27:25.638 | +03:28:49.58 | SN Ic | 0.0336 | ||
| TNS | 2024anb [ZTF24aacxzca] | 10:34:02.924 | +16:21:48.32 | SN II | 0.0519 | Broad H-alpha P-Cygni profile visible. | 10:34:02.911 | +16:21:48.46 | SN II | 0.0519 | ||
| TNS | 2024bhq [ZTF24aaedpbn] | 10:01:57.169 | -25:50:18.58 | SN Ia | 0.0474 | Strong Si II features visible consistent with being a SN Ia. | 10:01:57.158 | -25:50:18.38 | SN Ia | 0.0474 | ||
| TNS | 2024alo [ZTF24aacbqld] | 00:15:41.309 | +17:31:21.94 | SN IIb | 0.0194 | Broad H-alpha profile visible. Classification performed using match to the NGSF SN IIb template spectrum from 2008ax at z=0.0194. | 00:15:41.309 | +17:31:21.94 | SN IIb | 0.0194 | ||
| TNS | 2024dg [ZTF24aaacvhp] | 13:17:18.531 | +32:55:41.55 | SN Ia | 0.0513 | SDSS J131718.57+325543.6 | 0.05134446 | Galaxy dominated spectrum. Classification performed using match to the NGSF SN Ia template spectrum from PTF10ops at z=0.513. | 13:17:18.531 | +32:55:41.55 | SN Ia | 0.0513 |
| TNS | 2024xh [ZTF24aabqfbn] | 13:41:33.316 | +15:42:47.08 | SN II | 0.06 | Broad H-alpha profile visible, no obvious host emission lines. Classification performed using match to the NGSF SN II template spectrum from 2013fs at z=0.06. | 13:41:33.315 | +15:42:47.01 | SN II | 0.06 | ||
| TNS | 2024mi [ZTF23abvzhwa] | 07:37:30.130 | +45:17:12.82 | SN Ia | 0.085 | Classification performed using match to the NGSF SN Ia template spectrum from 2007sr at z=0.085. | 07:37:30.138 | +45:17:12.80 | SN Ia | 0.085 | ||
| TNS | 2024bfe [ZTF24aadknte] | 08:43:36.836 | +65:15:26.30 | SN Ia | 0.073 | Initially classified by P60 SEDM spectrum, classification secured and redshift refined using Lick spectrum, which displays Si II features consistent with being a SN Ia. | 08:43:36.836 | +65:15:26.30 | SN Ia | 0.073 | ||
| TNS | 2024ans [ZTF24aacgrqp] | 12:06:35.061 | +54:08:02.27 | SN Ia | 0.051 | SDSS J120635.04+540800.2 | Classification performed using match to the NGSF SN Ia template spectra from 2011fe and 1994D at z=0.051. | 12:06:35.080 | +54:08:02.11 | SN Ia | 0.051 | |
| TNS | 2024ng [ZTF24aaapkel] | 09:39:38.703 | +18:24:17.07 | 0.0735 | Host galaxy dominated spectrum, ~5 arcseconds from host nucleus. Lightcurve on the decline and reddening from peak of Mg ~ Mr ~ -19.2. Currently r ~ 19.3, g ~ 20.5. | 09:39:38.722 | +18:24:17.13 | |||||
| TNS | 2024xt [ZTF24aabpdug] | 11:14:56.009 | +50:20:07.42 | 0.047 | Possible H-alpha profile present but not definitively, strong host emission, transient ~3 arcseconds from host nucleus. Lightcurve displays 2 peaks in ZTF and ATLAS data ~20 days apart at similar magnitudes (Mg and Mr = -18 to -18.5), now on the decline and reddening. Currently r ~ 19, g ~ 20. | 11:14:56.009 | +50:20:07.42 | |||||
| TNS | 2023acco [ZTF23abvokyz] | 02:14:53.710 | +09:25:46.50 | 0.0888 | Blue continuum with marginal features and strong host emission, transient ~4.5 arcseconds from host nucleus. Lightcurve on decline from peak of Mg and Mr < -20, marginally reddening. Currently g ~ r ~ 18. | 02:14:53.710 | +09:25:46.38 | SLSN-I | 0.0888 | |||
| TNS | 2024hw [ZTF24aaaibep] | 10:46:52.353 | -01:23:27.48 | SN | 0.0389 | Host galaxy dominated spectrum, transient is coincident with bright star forming region in host. Lightcurve on decline and reddening from peak of Mg ~ -18.6, Mr ~ -18.7. Currently r ~ 18, g ~ 18.5. | 10:46:52.357 | -01:23:27.42 | SN II | 0.0389 |
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