Ubiquitous Late Radio Emission from Tidal Disruption Events
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913491168788480 |
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| author | Cendes, Yvette Berger, Edo Alexander, Kate D. Chornock, Ryan Margutti, Raffaella Metzger, Brian Wieringa, Mark H. Bietenholz, Michael F. Hajela, Aprajita Laskar, Tanmoy Stroh, Michael C. Terreran, Giacomo |
| author_facet | Cendes, Yvette Berger, Edo Alexander, Kate D. Chornock, Ryan Margutti, Raffaella Metzger, Brian Wieringa, Mark H. Bietenholz, Michael F. Hajela, Aprajita Laskar, Tanmoy Stroh, Michael C. Terreran, Giacomo |
| contents | We present radio observations of 23 optically discovered tidal disruption events (TDEs) on timescales of 500-3200 days post discovery. We detect nine new TDEs that did not have detectable radio emission at earlier times, indicating a late-time brightening after several hundred (and up to 2300) days; an additional seven TDEs exhibit radio emission whose origin is ambiguous or may be attributed to the host galaxy or an active galactic nucleus. We also report a new rising component in one TDE previously detected in the radio at 10^3 days. While the radio emission in some of the detected TDEs peaked on a timescale 2-4 yr, over half of the sample still show rising emission. The range of luminosities for the sample is 10^37-10^39 erg/s, about 2 orders of magnitude below the radio luminosity of the relativistic TDE Sw J1644+57. Our data set indicates 40% of all optical TDEs are detected in radio hundreds to thousands of days after discovery, and that this is probably more common than early radio emission peaking at 10^2 days. Using an equipartition analysis, we find evidence for a delayed launch of the radio-emitting outflows, with delay timescales of 500-2000 days, inferred velocities of 0.02-0.15c, and kinetic energies of 10^47-10^49 erg. We rule out off axis relativistic jets as a viable explanation for this population, and conclude delayed outflows are a more likely explanation, possibly from delayed disk formation. We conclude late radio emission marks a fairly ubiquitous but heretofore overlooked phase of TDE evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_13595 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Ubiquitous Late Radio Emission from Tidal Disruption Events Cendes, Yvette Berger, Edo Alexander, Kate D. Chornock, Ryan Margutti, Raffaella Metzger, Brian Wieringa, Mark H. Bietenholz, Michael F. Hajela, Aprajita Laskar, Tanmoy Stroh, Michael C. Terreran, Giacomo High Energy Astrophysical Phenomena We present radio observations of 23 optically discovered tidal disruption events (TDEs) on timescales of 500-3200 days post discovery. We detect nine new TDEs that did not have detectable radio emission at earlier times, indicating a late-time brightening after several hundred (and up to 2300) days; an additional seven TDEs exhibit radio emission whose origin is ambiguous or may be attributed to the host galaxy or an active galactic nucleus. We also report a new rising component in one TDE previously detected in the radio at 10^3 days. While the radio emission in some of the detected TDEs peaked on a timescale 2-4 yr, over half of the sample still show rising emission. The range of luminosities for the sample is 10^37-10^39 erg/s, about 2 orders of magnitude below the radio luminosity of the relativistic TDE Sw J1644+57. Our data set indicates 40% of all optical TDEs are detected in radio hundreds to thousands of days after discovery, and that this is probably more common than early radio emission peaking at 10^2 days. Using an equipartition analysis, we find evidence for a delayed launch of the radio-emitting outflows, with delay timescales of 500-2000 days, inferred velocities of 0.02-0.15c, and kinetic energies of 10^47-10^49 erg. We rule out off axis relativistic jets as a viable explanation for this population, and conclude delayed outflows are a more likely explanation, possibly from delayed disk formation. We conclude late radio emission marks a fairly ubiquitous but heretofore overlooked phase of TDE evolution. |
| title | Ubiquitous Late Radio Emission from Tidal Disruption Events |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2308.13595 |