The Peculiar Radio Evolution of the Tidal Disruption Event ASASSN-19bt
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Christy, Collin T. Alexander, Kate D. Cendes, Yvette Chornock, Ryan Laskar, Tanmoy Margutti, Raffaella Berger, Edo Bietenholz, Michael Coppejans, Deanne De Colle, Fabio Eftekhari, Tarraneh Holoien, Thomas W. -S. Matsumoto, Tatsuya Miller-Jones, James C. A. Ramirez-Ruiz, Enrico Saxton, Richard van Velzen, Sjoert Wieringa, Mark |
| author_facet | Christy, Collin T. Alexander, Kate D. Cendes, Yvette Chornock, Ryan Laskar, Tanmoy Margutti, Raffaella Berger, Edo Bietenholz, Michael Coppejans, Deanne De Colle, Fabio Eftekhari, Tarraneh Holoien, Thomas W. -S. Matsumoto, Tatsuya Miller-Jones, James C. A. Ramirez-Ruiz, Enrico Saxton, Richard van Velzen, Sjoert Wieringa, Mark |
| contents | We present detailed radio observations of the tidal disruption event (TDE) ASASSN-19bt/AT2019ahk, obtained with the Australia Telescope Compact Array (ATCA), the Atacama Large Millimeter/submillimeter Array (ALMA), and the MeerKAT radio telescopes, spanning 40 to 1464 days after the onset of the optical flare. We find that ASASSN-19bt displays unusual radio evolution compared to other TDEs, as the peak brightness of its radio emission increases rapidly until 457 days post-optical discovery and then plateaus. Using a generalized approach to standard equipartition techniques, we estimate the energy and corresponding physical parameters for two possible emission geometries: a non-relativistic spherical outflow and a relativistic outflow observed from an arbitrary viewing angle. We find that the non-relativistic solution implies a continuous energy rise in the outflow from $E\sim10^{46}$ erg to $E\sim10^{49}$ erg with $β\approx 0.05$, while the off-axis relativistic jet solution instead suggests $E\approx10^{52}$ erg with $Γ\sim10$ erg at late times in the maximally off-axis case. We find that neither model provides a holistic explanation for the origin and evolution of the radio emission, emphasizing the need for more complex models. ASASSN-19bt joins the population of TDEs that display unusual radio emission at late times. Conducting long-term radio observations of these TDEs, especially during the later phases, will be crucial for understanding how these types of radio emission in TDEs are produced. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_12431 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Peculiar Radio Evolution of the Tidal Disruption Event ASASSN-19bt Christy, Collin T. Alexander, Kate D. Cendes, Yvette Chornock, Ryan Laskar, Tanmoy Margutti, Raffaella Berger, Edo Bietenholz, Michael Coppejans, Deanne De Colle, Fabio Eftekhari, Tarraneh Holoien, Thomas W. -S. Matsumoto, Tatsuya Miller-Jones, James C. A. Ramirez-Ruiz, Enrico Saxton, Richard van Velzen, Sjoert Wieringa, Mark High Energy Astrophysical Phenomena We present detailed radio observations of the tidal disruption event (TDE) ASASSN-19bt/AT2019ahk, obtained with the Australia Telescope Compact Array (ATCA), the Atacama Large Millimeter/submillimeter Array (ALMA), and the MeerKAT radio telescopes, spanning 40 to 1464 days after the onset of the optical flare. We find that ASASSN-19bt displays unusual radio evolution compared to other TDEs, as the peak brightness of its radio emission increases rapidly until 457 days post-optical discovery and then plateaus. Using a generalized approach to standard equipartition techniques, we estimate the energy and corresponding physical parameters for two possible emission geometries: a non-relativistic spherical outflow and a relativistic outflow observed from an arbitrary viewing angle. We find that the non-relativistic solution implies a continuous energy rise in the outflow from $E\sim10^{46}$ erg to $E\sim10^{49}$ erg with $β\approx 0.05$, while the off-axis relativistic jet solution instead suggests $E\approx10^{52}$ erg with $Γ\sim10$ erg at late times in the maximally off-axis case. We find that neither model provides a holistic explanation for the origin and evolution of the radio emission, emphasizing the need for more complex models. ASASSN-19bt joins the population of TDEs that display unusual radio emission at late times. Conducting long-term radio observations of these TDEs, especially during the later phases, will be crucial for understanding how these types of radio emission in TDEs are produced. |
| title | The Peculiar Radio Evolution of the Tidal Disruption Event ASASSN-19bt |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2404.12431 |