Early emission characterization of TDE 2025aarm

Simongini, Andrea; Kherlakian, Maria; López-Oramas, Alicia; Becerra, Josefa; Cerasole, Davide
Referencia bibliográfica

Astronomy and Astrophysics

Fecha de publicación:
6
2026
Número de autores
5
Número de autores del IAC
2
Número de citas
0
Número de citas referidas
0
Descripción
In this work, we present early emission data analysis of the tidal disruption event TDE 2025aarm, including optical, UV, and X-ray data. At a redshift of z = 0.01368, TDE 2025aarm is the second closest TDE ever discovered, offering a valuable opportunity to study such phenomena in great detail. We observed TDE 2025aarm in the optical with the Liverpool Telescope for a total of three epochs. We complemented our dataset with ancillary spectroscopic and photometric data. The early optical spectra are characterized by a blue-continuum and helium, hydrogen, and possibly Bowen lines typical of H+He events. The optical light curves peak at Mg ∼ −18.68 mag and are well described by fallback of a M★ ∼ 0.16 M⊙ star onto a MBH ∼ 2 × 107 M⊙ black hole. We report Swift-XRT detection in the 0.3 − 10 keV range, with a total flux of FX ∼ 1.42 × 10−14 erg cm−2 s−1, fit by a blackbody with kBT ∼ 0.39 keV. This makes TDE 2025aarm a new event among optical/UV bright TDEs detected in soft X-rays. Our analysis suggests that the early emission from TDE 2025aarm is powered by circularization shocks and that the delayed accretion scenario best describes the observed features.