DRAFT
2023-04-22 15:19:55
Type: Object/s-Data/Analysis
Bibcode: 2023TNSAN..97....1F
SN2023aew: Spectroscopic observation during a significant rebrightening
Authors: Christopher Frohmaier (Southampton), Georgios Dimitriadis (TCD), Miika Pursiainen (DTU), Phil Wiseman (Southampton), Mat Smith (CNRS/IN2P3), Mark Sullivan (Southampton), T. Müller Bravo (ICE)
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
We report on the significant rebrightening of ~1.8 magnitudes in ~5 days for the type IIb SN2023aew, more than 80 days after the initial classification. We obtained a spectrum of the target on 2023-04-20 from Liverpool Telescope using the SPRAT instrument. We find a good fit to type Ib templates using SNID.

SN2023aew was classified as a type IIb on 2023-01-27 based on spectroscopic observations with the P60 / SEDM. Now, more than 80 days after this classification, we report on a rapid rebrightening of this object in the ZTF and ATLAS light curves.

We obtained a spectrum of the target on 2023-04-20 using the LT SPRAT instrument (1 x 600s) when the object was r~17.4 mag. 

Using SNID, we find matches to late-time SN Ib templates. Although most of our best SNID matches prefer a SN Ib at a slightly higher redshift (z=0.036) than the classification. The object appears to have strong He I absorption and prominent [Ca II] emission.

We are unable to resolve this object as a separate supernova or as a rebrightening of SN2023aew. Follow-up observations are encouraged.

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 2023aew 17:40:51.370 +66:12:22.75 SN IIb 0.025 SDSS J174050.55+661220.7 17:40:51.370 +66:12:22.75 SN IIb 0.025
File Comments
SN2023aew_20230421_60055.041_e_comp0018_snidflux copy.png SNID fit at a similar redshift to the classification
SN2023aew_20230421_60055.041_e_comp0001_snidflux copy.png Our best-matching SNID template.

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