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Near-Horizon Tidal Disruption Events — arXiv:2609.08430

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.08430
License (as archived): CC0-1.0
Archived: 2026-10-16T16:34:25.196Z
SHA-256 of the archived text: ec90ebb4ba01645aecabd1e10da7420cddd4b597c15dabd7b953a70d6883a8f9
Stable URL of this page: https://metraipolis.com/documento/dc_bb19ccfca202

How to cite

Near-Horizon Tidal Disruption Events — arXiv:2609.08430 — arXiv (en), https://arxiv.org/abs/2609.08430 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_bb19ccfca202 (Metraipolis archive dc_bb19ccfca202, sha256 ec90ebb4ba01645aecabd1e10da7420cddd4b597c15dabd7b953a70d6883a8f9)

BibTeX

@misc{dcbb19ccfca202,
  title = {Near-Horizon Tidal Disruption Events — arXiv:2609.08430},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.08430},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_bb19ccfca202; sha256 ec90ebb4ba01645aecabd1e10da7420cddd4b597c15dabd7b953a70d6883a8f9},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.08430. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Tidal disruption events (TDEs) offer a unique dynamical probe of the spacetime geometry around supermassive black holes (SMBHs). While conventional TDEs occur around SMBHs of $M_\bullet \sim 10^6 - 10^7 M_\odot$, where stars are disrupted far from the event horizon, here we identify a special class of TDEs around rapidly spinning SMBHs with masses $M_\bullet \gtrsim 10^8 M_\odot$, where the tidal-disruption radius approaches the gravitational radius. We term these events "near-horizon TDEs" and, by calculating geodesics in Kerr spacetime, investigate how the proximity of the horizon modifies the debris evolution and subsequent fallback. We find that for stars encountering the SMBH on parabolic orbits, up to $\sim (90 \%-95 \%)$ of the stellar debris either plunges directly into the SMBH or escapes the system. Bound orbits, by contrast, retain a substantially larger fraction of the debris. Using the resulting debris distribution, we calculate the fallback rates and find that bound orbits produce intrinsically higher peak fallback rates and shorter decay timescales, by factors of $\sim 10^3$ relative to parabolic orbits. However, when the stellar orbital angular momentum is particularly low, the peak fallback rate can be substantially suppressed by debris lost to plunge orbits. This combination of rapid fallback and a mass deficit naturally explains overluminous TDEs such as ASASSN-15lh, which standard TDE models have struggled to reproduce. Our work establishes near-horizon TDEs as a new probe of strong-field gravity and a promising tool for identifying massive, rapidly spinning SMBHs.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-09 in gr-qc).
Categorie arXiv: High Energy Astrophysical Phenomena (astro-ph.HE) ; General Relativity and Quantum Cosmology (gr-qc).
Pagina del lavoro: https://arxiv.org/abs/2609.08430 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-16T16:01:37.112Z dalla pagina https://arxiv.org/catchup/gr-qc/2026-09-09?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).