Eight Years of Light from ASASSN-15oi: Towards Understanding the Late-time Evolution of TDEs
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2024
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| author | Hajela, A. Alexander, K. D. Margutti, R. Chornock, R. Bietenholz, M. Christy, C. T. Stroh, M. Terreran, G. Saxton, R. Komossa, S. Bright, J. S. Ramirez-Ruiz, E. Coppejans, D. L. Leung, J. K. Cendes, Y. Wiston, E. Laskar, T. Horesh, A. Schroeder, G. J., Nayana A. Wieringa, M. H. Velez, N. Berger, E. Blanchard, P. K. Eftekhari, T. Gomez, S. Nicholl, M. Sears, H. Zauderer, B. A. |
| author_facet | Hajela, A. Alexander, K. D. Margutti, R. Chornock, R. Bietenholz, M. Christy, C. T. Stroh, M. Terreran, G. Saxton, R. Komossa, S. Bright, J. S. Ramirez-Ruiz, E. Coppejans, D. L. Leung, J. K. Cendes, Y. Wiston, E. Laskar, T. Horesh, A. Schroeder, G. J., Nayana A. Wieringa, M. H. Velez, N. Berger, E. Blanchard, P. K. Eftekhari, T. Gomez, S. Nicholl, M. Sears, H. Zauderer, B. A. |
| contents | We present the results from an extensive follow-up campaign of the Tidal Disruption Event (TDE) ASASSN-15oi spanning $δt \sim 10 - 3000$ d, offering an unprecedented window into the multiwavelength properties of a TDE during its first $\approx 8$ years of evolution. ASASSN-15oi is one of the few TDEs with strong detections at X-ray, optical/UV, and radio wavelengths and featured two delayed radio flares at $δt \sim 180$ d and $δt \sim 1400$ d. Our observations at $> 1400$ d reveal an absence of thermal X-rays, a late-time variability in the non-thermal X-ray emission, and sharp declines in the non-thermal X-ray and radio emission at $δt \sim 2800$ d and $\sim 3000$ d, respectively. The UV emission shows no significant evolution at $>400$ d and remains above the pre-TDE level. We show that a cooling envelope model can explain the thermal emission consistently across all epochs. We also find that a scenario involving episodic ejection of material due to stream-stream collisions is conducive to explaining the first radio flare. Given the peculiar spectral and temporal evolution of the late-time emission, however, constraining the origins of the second radio flare and the non-thermal X-rays remains challenging. Our study underscores the critical role of long-term, multiwavelength follow-up. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_19019 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Eight Years of Light from ASASSN-15oi: Towards Understanding the Late-time Evolution of TDEs Hajela, A. Alexander, K. D. Margutti, R. Chornock, R. Bietenholz, M. Christy, C. T. Stroh, M. Terreran, G. Saxton, R. Komossa, S. Bright, J. S. Ramirez-Ruiz, E. Coppejans, D. L. Leung, J. K. Cendes, Y. Wiston, E. Laskar, T. Horesh, A. Schroeder, G. J., Nayana A. Wieringa, M. H. Velez, N. Berger, E. Blanchard, P. K. Eftekhari, T. Gomez, S. Nicholl, M. Sears, H. Zauderer, B. A. High Energy Astrophysical Phenomena We present the results from an extensive follow-up campaign of the Tidal Disruption Event (TDE) ASASSN-15oi spanning $δt \sim 10 - 3000$ d, offering an unprecedented window into the multiwavelength properties of a TDE during its first $\approx 8$ years of evolution. ASASSN-15oi is one of the few TDEs with strong detections at X-ray, optical/UV, and radio wavelengths and featured two delayed radio flares at $δt \sim 180$ d and $δt \sim 1400$ d. Our observations at $> 1400$ d reveal an absence of thermal X-rays, a late-time variability in the non-thermal X-ray emission, and sharp declines in the non-thermal X-ray and radio emission at $δt \sim 2800$ d and $\sim 3000$ d, respectively. The UV emission shows no significant evolution at $>400$ d and remains above the pre-TDE level. We show that a cooling envelope model can explain the thermal emission consistently across all epochs. We also find that a scenario involving episodic ejection of material due to stream-stream collisions is conducive to explaining the first radio flare. Given the peculiar spectral and temporal evolution of the late-time emission, however, constraining the origins of the second radio flare and the non-thermal X-rays remains challenging. Our study underscores the critical role of long-term, multiwavelength follow-up. |
| title | Eight Years of Light from ASASSN-15oi: Towards Understanding the Late-time Evolution of TDEs |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2407.19019 |