The Astrophysical Journal (Jan 2024)
Radio Afterglows from Tidal Disruption Events: An Unbiased Sample from ASKAP RACS
- Akash Anumarlapudi,
- Dougal Dobie,
- David L. Kaplan,
- Tara Murphy,
- Assaf Horesh,
- Emil Lenc,
- Laura Driessen,
- Stefan W. Duchesne,
- Hannah Dykaar,
- B. M. Gaensler,
- Timothy J. Galvin,
- Joe Grundy,
- George Heald,
- Aidan W. Hotan,
- Minh Huynh,
- James K. Leung,
- David McConnell,
- Vanessa A. Moss,
- Joshua Pritchard,
- Wasim Raja,
- Kovi Rose,
- Gregory Sivakoff,
- Yuanming Wang,
- Ziteng Wang,
- Mark H. Wieringa,
- Matthew T. Whiting
Affiliations
- Akash Anumarlapudi
- ORCiD
- Department of Physics, University of Wisconsin-Milwaukee , P.O. Box 413, Milwaukee, WI 53201, USA ; [email protected]
- Dougal Dobie
- ORCiD
- Centre for Astrophysics and Supercomputing, Swinburne University of Technology , Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) , Hawthorn, VIC, Australia; Sydney Institute for Astronomy, School of Physics, University of Sydney , NSW 2006, Australia
- David L. Kaplan
- ORCiD
- Department of Physics, University of Wisconsin-Milwaukee , P.O. Box 413, Milwaukee, WI 53201, USA ; [email protected]
- Tara Murphy
- ORCiD
- ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) , Hawthorn, VIC, Australia; Sydney Institute for Astronomy, School of Physics, University of Sydney , NSW 2006, Australia
- Assaf Horesh
- ORCiD
- Racah Institute of Physics, The Hebrew University of Jerusalem , Jerusalem, 91904, Israel
- Emil Lenc
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 76, Epping, NSW 1710, Australia
- Laura Driessen
- ORCiD
- Sydney Institute for Astronomy, School of Physics, University of Sydney , NSW 2006, Australia
- Stefan W. Duchesne
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 1130, Bentley, WA 6102, Australia
- Hannah Dykaar
- ORCiD
- Dunlap Institute for Astronomy and Astrophysics, University of Toronto , 50 St. George St., Toronto, ON M5S 3H4, Canada; David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St. George St., Toronto, ON M5S 3H4, Canada
- B. M. Gaensler
- ORCiD
- Dunlap Institute for Astronomy and Astrophysics, University of Toronto , 50 St. George St., Toronto, ON M5S 3H4, Canada; David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St. George St., Toronto, ON M5S 3H4, Canada; Department of Astronomy and Astrophysics, University of California Santa Cruz , 1156 High Street, Santa Cruz, CA 95064, USA
- Timothy J. Galvin
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 1130, Bentley, WA 6102, Australia; International Centre for Radio Astronomy Research—Curtin University , 1 Turner Avenue, Bentley, WA 6102, Australia
- Joe Grundy
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 1130, Bentley, WA 6102, Australia; International Centre for Radio Astronomy Research—Curtin University , 1 Turner Avenue, Bentley, WA 6102, Australia
- George Heald
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 1130, Bentley, WA 6102, Australia
- Aidan W. Hotan
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 1130, Bentley, WA 6102, Australia
- Minh Huynh
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 1130, Bentley, WA 6102, Australia
- James K. Leung
- ORCiD
- Racah Institute of Physics, The Hebrew University of Jerusalem , Jerusalem, 91904, Israel; Dunlap Institute for Astronomy and Astrophysics, University of Toronto , 50 St. George St., Toronto, ON M5S 3H4, Canada
- David McConnell
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 76, Epping, NSW 1710, Australia
- Vanessa A. Moss
- ORCiD
- Sydney Institute for Astronomy, School of Physics, University of Sydney , NSW 2006, Australia; CSIRO Space and Astronomy , P.O. Box 76, Epping, NSW 1710, Australia
- Joshua Pritchard
- ORCiD
- ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) , Hawthorn, VIC, Australia; Sydney Institute for Astronomy, School of Physics, University of Sydney , NSW 2006, Australia; CSIRO Space and Astronomy , P.O. Box 76, Epping, NSW 1710, Australia
- Wasim Raja
- CSIRO Space and Astronomy , P.O. Box 76, Epping, NSW 1710, Australia
- Kovi Rose
- ORCiD
- Sydney Institute for Astronomy, School of Physics, University of Sydney , NSW 2006, Australia; CSIRO Space and Astronomy , P.O. Box 76, Epping, NSW 1710, Australia
- Gregory Sivakoff
- ORCiD
- Department of Physics, University of Alberta , CCIS 4-181, Edmonton, AB T6G 2E1, Canada
- Yuanming Wang
- ORCiD
- Centre for Astrophysics and Supercomputing, Swinburne University of Technology , Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) , Hawthorn, VIC, Australia
- Ziteng Wang
- ORCiD
- International Centre for Radio Astronomy Research—Curtin University , 1 Turner Avenue, Bentley, WA 6102, Australia
- Mark H. Wieringa
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 76, Epping, NSW 1710, Australia
- Matthew T. Whiting
- ORCiD
- CSIRO Space and Astronomy , P.O. Box 76, Epping, NSW 1710, Australia
- DOI
- https://doi.org/10.3847/1538-4357/ad64d3
- Journal volume & issue
-
Vol. 974,
no. 2
p. 241
Abstract
Late-time (∼a 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 subrelativistic TDEs. Detailed studies of some of these TDEs at radio wavelengths are also challenging the existing models for radio emission. Using all-sky multiepoch 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 AT 2019ahk and extending the time baseline out to almost 3000 days for some events. Overall, we find that at least ${22}_{-11}^{+15} \% $ 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 (two epochs separated by ∼3 yr) of the survey. Finally, we project that the ongoing higher-cadence (∼2 months) ASKAP Variable and Slow Transients survey can detect ∼20 TDEs in its operational span (4 yr), given the current rate from optical surveys.
Keywords
- Radio transient sources
- Tidal disruption
- Extragalactic radio sources
- Radio continuum emission
- Radio sources
