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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| Accès en ligne: | https://arxiv.org/abs/2605.13799 |
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| _version_ | 1866913124283580416 |
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| author | Śniegowska, Marzena Czerny, Bożena Zajaček, Michal Rosa, Valentina Karas, Vladimír Jankovič, Taj Petrushevska, Tanja Ilić, Dragana Trakhtenbrot, Benny Kurfürst, Petr |
| author_facet | Śniegowska, Marzena Czerny, Bożena Zajaček, Michal Rosa, Valentina Karas, Vladimír Jankovič, Taj Petrushevska, Tanja Ilić, Dragana Trakhtenbrot, Benny Kurfürst, Petr |
| contents | The event PS16dtm, which occured in the center of the Narrow Line Seyfert 1 (NLS1) galaxy SDSS J015804.75-005221.8 (z = 0.080440), is one of the few candidates for a tidal disruption event in an already-acretting active galactic nucleus (AGN). We aim to shed light on the character of the tidal disruption event in this source since it exhibits unusual peculiarities, such as the double-peak optical/UV light curve and a low blackbody temperature with a lack of X-ray emission. We perform spectral analysis of the source before and during the event. We model the time evolution of the luminosity profile using a numerical code that describes the viscous evolution of the flow. From the combined spectral and timing studies, we interpret the event as the disruption of a $\sim 0.3 M_{\odot}$ main-sequence star, or gradual partial disruption of the low-mass giant star. The star is likely on a circular orbit, embedded in the accretion disc. The discussion of the evolution of the star rather suggests that the orbit is counter-rotating. We observe the system at a sufficiently large viewing angle that the actual disruption process is not directly observed. The disrupted star and inner disc are shielded from the observer by a gaseous envelope. Further observations of the system returning to the previous NLS1 state, particularly in the X-ray band, are needed to confirm the proposed scenario and to put constraints on the return to a regular NLS1 state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_13799 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Tidal disruption of a low-mass star in an active galactic nucleus as the origin of the PS16dtm outburst Śniegowska, Marzena Czerny, Bożena Zajaček, Michal Rosa, Valentina Karas, Vladimír Jankovič, Taj Petrushevska, Tanja Ilić, Dragana Trakhtenbrot, Benny Kurfürst, Petr High Energy Astrophysical Phenomena The event PS16dtm, which occured in the center of the Narrow Line Seyfert 1 (NLS1) galaxy SDSS J015804.75-005221.8 (z = 0.080440), is one of the few candidates for a tidal disruption event in an already-acretting active galactic nucleus (AGN). We aim to shed light on the character of the tidal disruption event in this source since it exhibits unusual peculiarities, such as the double-peak optical/UV light curve and a low blackbody temperature with a lack of X-ray emission. We perform spectral analysis of the source before and during the event. We model the time evolution of the luminosity profile using a numerical code that describes the viscous evolution of the flow. From the combined spectral and timing studies, we interpret the event as the disruption of a $\sim 0.3 M_{\odot}$ main-sequence star, or gradual partial disruption of the low-mass giant star. The star is likely on a circular orbit, embedded in the accretion disc. The discussion of the evolution of the star rather suggests that the orbit is counter-rotating. We observe the system at a sufficiently large viewing angle that the actual disruption process is not directly observed. The disrupted star and inner disc are shielded from the observer by a gaseous envelope. Further observations of the system returning to the previous NLS1 state, particularly in the X-ray band, are needed to confirm the proposed scenario and to put constraints on the return to a regular NLS1 state. |
| title | Tidal disruption of a low-mass star in an active galactic nucleus as the origin of the PS16dtm outburst |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2605.13799 |