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We present an extensive analysis of the optical and UV properties ofAT2023clx, the closest TDE to date, that occurred in the nucleus of theinteracting LINER galaxy, NGC3799 (z=0.01107). From several standard methods,we estimate the mass of the central SMBH to be ~ 10^6 Msol. After correctingfor the host reddening (E(B-V) = 0.177 mag) we measured its peak absoluteg-band magnitude to be -18.25\pm0.05 mag, and its peak bolometric luminosity tobe L_pk=(3.24\pm0.36)x10^43erg/s, making AT2023clx an intermediate luminosityTDE. The first distinctive feature of AT2023clx is that it rose to peak withinonly 10.4\pm2.5 days, making it the fastest rising TDE to date. Our SMBH massestimate rules out the possibility of an intermediate mass BH as the reason ofthe fast rise. Dense spectral follow-up revealed a blue continuum that coolsslowly and broad Balmer and HeII lines as well as weak HeI emission, featuresthat are typically seen in TDEs. A flat Balmer decrement (~ 1.58) suggests thatthe lines are collisionally excited rather than being produced viaphotoionisation, as in typical active galactic nuclei. A second distinctivefeature, seen for the first time in TDE spectra, is a sharp, narrow emissionpeak at a rest wavelength of ~6353 A. This feature is clearly visible up to 10dpost-peak; we attribute it to clumpy material preceding the bulk outflow, andmanifested as a high-velocity component of Ha (-9584km/s). The thirddistinctive feature is a break observed in the near-UV light curves that isreflected as a dip in the temperature evolution around ~18-28 days post-peak.Combining these findings, we propose a scenario for AT2023clx involving thedisruption of a very low-mass star (<=0.1Msol) with an outflow launched in ourline-of-sight with disruption properties that led to circularisation and promptand efficient accretion disc formation, observed through a low-densityphotosphere.

The fast transient AT 2023clx in the nearby LINER galaxy NGC 3799, as a tidal disruption event of a very low-mass star