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Large-amplitude modulations and hours-timescale variability in the early X-ray light curve of a tidal disruption flare

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	Malyali, A., Rau, A., Baldini, P., Franchini, A., Markowitz, A. G., Merloni, A., Anderson, G. E., Goodwin, A. J., Homan, D., Krumpe, M., Liu, Z., Miller-Jones, J. C. A., Grotova, I., Kawka, A.
Formato:	Preprint
Publicado:	2026
Materias:	High Energy Astrophysical Phenomena
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

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author	Malyali, A. Rau, A. Baldini, P. Franchini, A. Markowitz, A. G. Merloni, A. Anderson, G. E. Goodwin, A. J. Homan, D. Krumpe, M. Liu, Z. Miller-Jones, J. C. A. Grotova, I. Kawka, A.
author_facet	Malyali, A. Rau, A. Baldini, P. Franchini, A. Markowitz, A. G. Merloni, A. Anderson, G. E. Goodwin, A. J. Homan, D. Krumpe, M. Liu, Z. Miller-Jones, J. C. A. Grotova, I. Kawka, A.
contents	We present new X-ray, optical, and UV observations of the tidal disruption event candidate eRASSt J234402.9-352640, (hereafter J2344). Between 50 and 60 days after peak optical brightness, J2344 exhibited large-amplitude modulations in its 0.2-2 keV emission, when the flux repeatedly dimmed and re-brightened by a factor of ~6, over a ~3-day timescale. These modulations exhibited harder-when-brighter behaviour but were not detected in high-cadence observations obtained 60-70 days and 170-200 days after peak optical brightness, when the system instead exhibited stochastic X-ray variability over timescales of hours. We discuss the different physical mechanisms responsible for such exotic X-ray variability and explore the possibility that the modulations in J2344 were caused by the Lense-Thirring precession of the inner accretion flow around the disrupting black hole.
format	Preprint
id	arxiv_https___arxiv_org_abs_2602_23418
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Large-amplitude modulations and hours-timescale variability in the early X-ray light curve of a tidal disruption flare Malyali, A. Rau, A. Baldini, P. Franchini, A. Markowitz, A. G. Merloni, A. Anderson, G. E. Goodwin, A. J. Homan, D. Krumpe, M. Liu, Z. Miller-Jones, J. C. A. Grotova, I. Kawka, A. High Energy Astrophysical Phenomena We present new X-ray, optical, and UV observations of the tidal disruption event candidate eRASSt J234402.9-352640, (hereafter J2344). Between 50 and 60 days after peak optical brightness, J2344 exhibited large-amplitude modulations in its 0.2-2 keV emission, when the flux repeatedly dimmed and re-brightened by a factor of ~6, over a ~3-day timescale. These modulations exhibited harder-when-brighter behaviour but were not detected in high-cadence observations obtained 60-70 days and 170-200 days after peak optical brightness, when the system instead exhibited stochastic X-ray variability over timescales of hours. We discuss the different physical mechanisms responsible for such exotic X-ray variability and explore the possibility that the modulations in J2344 were caused by the Lense-Thirring precession of the inner accretion flow around the disrupting black hole.
title	Large-amplitude modulations and hours-timescale variability in the early X-ray light curve of a tidal disruption flare
topic	High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2602.23418