Disk-to-Corona State Transition and Extreme X-ray Variability in the Tidal Disruption Event AT2019teq
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866914239400116224 |
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| author | Berger, Vera Kara, Erin Chakraborty, Joheen Masterson, Megan Burdge, Kevin |
| author_facet | Berger, Vera Kara, Erin Chakraborty, Joheen Masterson, Megan Burdge, Kevin |
| contents | We present a five-year X-ray spectral and timing analysis of the optically selected Tidal Disruption Event (TDE) AT2019teq, which displays extreme variability, including order-of-magnitude changes in flux on minute-to-day timescales, and a rare late-time emergence of hard X-ray emission leading to the longest-lived corona in a known TDE. In one epoch, we detect sub-mHz quasi-periodic oscillations with significance tested via MCMC-based red-noise simulations (p $\leq 0.03$). AT2019teq exhibits a clear spectral evolution from a soft (blackbody-dominated) state to a hard (power-law-dominated) state, with a late-time radio brightening that may be associated with the state transition. We identify similarities between AT2019teq's evolution and X-ray binary soft-to-hard state transitions, albeit at higher luminosity and much faster timescales. We use the presence of both a disk-dominated and a corona-dominated state to apply multiple mass estimators from X-ray spectral and variability properties. These techniques are mutually consistent within $2σ$ and systematically yield a lower black hole mass ($\log(M_{BH}/M_{\odot}) = 5.67 \pm 0.09$) than inferred from host galaxy scaling ($\log(M_{BH}/M_{\odot})=6.14 \pm 0.19$). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_04311 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Disk-to-Corona State Transition and Extreme X-ray Variability in the Tidal Disruption Event AT2019teq Berger, Vera Kara, Erin Chakraborty, Joheen Masterson, Megan Burdge, Kevin High Energy Astrophysical Phenomena We present a five-year X-ray spectral and timing analysis of the optically selected Tidal Disruption Event (TDE) AT2019teq, which displays extreme variability, including order-of-magnitude changes in flux on minute-to-day timescales, and a rare late-time emergence of hard X-ray emission leading to the longest-lived corona in a known TDE. In one epoch, we detect sub-mHz quasi-periodic oscillations with significance tested via MCMC-based red-noise simulations (p $\leq 0.03$). AT2019teq exhibits a clear spectral evolution from a soft (blackbody-dominated) state to a hard (power-law-dominated) state, with a late-time radio brightening that may be associated with the state transition. We identify similarities between AT2019teq's evolution and X-ray binary soft-to-hard state transitions, albeit at higher luminosity and much faster timescales. We use the presence of both a disk-dominated and a corona-dominated state to apply multiple mass estimators from X-ray spectral and variability properties. These techniques are mutually consistent within $2σ$ and systematically yield a lower black hole mass ($\log(M_{BH}/M_{\odot}) = 5.67 \pm 0.09$) than inferred from host galaxy scaling ($\log(M_{BH}/M_{\odot})=6.14 \pm 0.19$). |
| title | Disk-to-Corona State Transition and Extreme X-ray Variability in the Tidal Disruption Event AT2019teq |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.04311 |