DRAFT
2025-08-30 16:50:48
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.276....1C
Tentative classification of the optical transient AT 2025vjw as a tidal disruption event.
Authors: Panos Charalampopoulos (Univ. Turku)
Keywords: Transient, TDE
Abstract:
We present a NOT/ALFOSC optical spectrum of the rising optical transient AT 2025vjw located in the nucleus of its host galaxy. The spectrum is blue and featureless. There are no evident host galaxy lines and no spectroscopic redshift for the host. At a redshift of z~0.068, we tentatively identify some galaxy lines and a broad and shallow He II 4686 (see Body) but the identification is not robust. At this redshift, the latest g-band absolute magnitude (corrected for MW extinction; A_V = 0.124) is M = –19.2. Based on the spectra, the location of the transient, the absolute magnitude and its persistent blue optical colours (g-r = -(0.3-0.4)), it is possible that AT 2025jvw is a tidal disruption event, however a (superluminous) supernova cannot be ruled-out yet. Further follow-up to determine the nature of the transient is encouraged. Until then, we classify the transient as "Other".

AT 2025vjw/GOTO25gin (RA = 23:09:00.780, Dec = -07:31:07.52) was discovered by the GOTO survey on 2025-08-24 (MJD = 60911.58), in the nucleus of the galaxy SDSS J230900.80-073107.8. Since its discovery (~6 days ago) it is slowly rising. Throughout its evolution it shows persistent blue optical colours (ZTF g-r = -(0.3-0.4); corrected for MW extinction: Av = 0.124). 

We obtained a NOT/ALFOSC optical spectrum to classify the transient (MJD 60917.04). The spectrum is blue and featureless. There are no evident host galaxy lines and no spectroscopic redshift for the host. At a redshift of z~0.068, we tentatively identify Ca H&K and G lines, as well as Hbeta in absorption but the identification is not robust. At this redshift, we also tentatively identify a broad and shallow He II 4686 emission profile (see attached screenshot). Correspondingly, the latest g-band absolute magnitude (corrected for MW extinction; A_V = 0.124) is M = –19.2. Classification tools do not return robust matches. Based on the spectra, the location of the transient, the absolute magnitude and its persistent blue optical colours, it is possible that AT 2025jvw is a tidal disruption event, however a (superluminous) supernova cannot be ruled-out yet. Further follow-up to determine the nature of the transient is encouraged. Until then, we classify the transient as "Other".

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 2025vjw [GOTO25gin] 23:09:00.780 -07:31:07.52 Other 0.068 SDSS J230900.80-073107.8 23:09:00.791 -07:31:07.73 TDE-H-He 0.21
File Comments
AT2025vjw_0.png

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