Radio afterglows from tidal disruption events: An unbiased sample from ASKAP RACS
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2024
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| author | Anumarlapudi, Akash Dobie, Dougal Kaplan, David L. Murphy, Tara Horesh, Assaf Lenc, Emil Driessen, Laura N. Duchesne, Stefan W. Dykaar, Ms. Hannah Gaensler, Bryan M. Galvin, Timothy J. Grundy, J. A. Heald, George Hotan, Aidan Huynh, Minh Leung, James McConnell, David Moss, Vanessa A. Pritchard, Joshua Raja, Wasim Rose, Kovi Sivakoff, Gregory R. Wang, Yuanming Wang, Ziteng Wieringa, Mark Whiting, M. T. |
| author_facet | Anumarlapudi, Akash Dobie, Dougal Kaplan, David L. Murphy, Tara Horesh, Assaf Lenc, Emil Driessen, Laura N. Duchesne, Stefan W. Dykaar, Ms. Hannah Gaensler, Bryan M. Galvin, Timothy J. Grundy, J. A. Heald, George Hotan, Aidan Huynh, Minh Leung, James McConnell, David Moss, Vanessa A. Pritchard, Joshua Raja, Wasim Rose, Kovi Sivakoff, Gregory R. Wang, Yuanming Wang, Ziteng Wieringa, Mark Whiting, M. T. |
| contents | Late-time ($\sim$ year) radio follow-up of optically-discovered tidal disruption events (TDEs) is increasingly resulting in detections at radio wavelengths, and there is growing evidence for this late-time radio activity to be common to the broad class of sub-relativistic TDEs. Detailed studies of some of these TDEs at radio wavelengths are also challenging the existing models for radio emission. Using all-sky multi-epoch data from the Australian Square Kilometre Array Pathfinder (ASKAP), taken as a part of the Rapid ASKAP Continuum Survey (RACS), we searched for radio counterparts to a sample of optically-discovered TDEs. We detected late-time emission at RACS frequencies (742-1032\,MHz) in five TDEs, reporting the independent discovery of radio emission from TDE AT2019ahk and extending the time baseline out to almost 3000\,days for some events. Overall, we find that at least $22^{+15}_{-11}$\% of the population of optically-discovered TDEs has detectable radio emission in the RACS survey, while also noting that the true fraction can be higher given the limited cadence (2 epochs separated by $\sim 3\,$ years) of the survey. Finally, we project that the ongoing higher-cadence ($\sim 2$\,months) ASKAP Variable and Slow Transients (VAST) survey can detect $\sim 20$ TDEs in its operational span (4\,yrs), given the current rate from optical surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_12097 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Radio afterglows from tidal disruption events: An unbiased sample from ASKAP RACS Anumarlapudi, Akash Dobie, Dougal Kaplan, David L. Murphy, Tara Horesh, Assaf Lenc, Emil Driessen, Laura N. Duchesne, Stefan W. Dykaar, Ms. Hannah Gaensler, Bryan M. Galvin, Timothy J. Grundy, J. A. Heald, George Hotan, Aidan Huynh, Minh Leung, James McConnell, David Moss, Vanessa A. Pritchard, Joshua Raja, Wasim Rose, Kovi Sivakoff, Gregory R. Wang, Yuanming Wang, Ziteng Wieringa, Mark Whiting, M. T. High Energy Astrophysical Phenomena Late-time ($\sim$ year) radio follow-up of optically-discovered tidal disruption events (TDEs) is increasingly resulting in detections at radio wavelengths, and there is growing evidence for this late-time radio activity to be common to the broad class of sub-relativistic TDEs. Detailed studies of some of these TDEs at radio wavelengths are also challenging the existing models for radio emission. Using all-sky multi-epoch data from the Australian Square Kilometre Array Pathfinder (ASKAP), taken as a part of the Rapid ASKAP Continuum Survey (RACS), we searched for radio counterparts to a sample of optically-discovered TDEs. We detected late-time emission at RACS frequencies (742-1032\,MHz) in five TDEs, reporting the independent discovery of radio emission from TDE AT2019ahk and extending the time baseline out to almost 3000\,days for some events. Overall, we find that at least $22^{+15}_{-11}$\% of the population of optically-discovered TDEs has detectable radio emission in the RACS survey, while also noting that the true fraction can be higher given the limited cadence (2 epochs separated by $\sim 3\,$ years) of the survey. Finally, we project that the ongoing higher-cadence ($\sim 2$\,months) ASKAP Variable and Slow Transients (VAST) survey can detect $\sim 20$ TDEs in its operational span (4\,yrs), given the current rate from optical surveys. |
| title | Radio afterglows from tidal disruption events: An unbiased sample from ASKAP RACS |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2407.12097 |