An emission state switching radio transient with a 54 minute period
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916328080670720 |
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| author | Caleb, M. Lenc, E. Kaplan, D. L. Murphy, T. Men, Y. P. Shannon, R. M. Ferrario, L. Rajwade, K. M. Clarke, T. E. Giacintucci, S. Hurley-Walker, N. Hyman, S. D. Lower, M. E. McSweeney, Sam Ravi, V. Barr, E. D. Buchner, S. Flynn, C. M. L. Hessels, J. W. T. Kramer, M. Pritchard, J. Stappers, B. W. |
| author_facet | Caleb, M. Lenc, E. Kaplan, D. L. Murphy, T. Men, Y. P. Shannon, R. M. Ferrario, L. Rajwade, K. M. Clarke, T. E. Giacintucci, S. Hurley-Walker, N. Hyman, S. D. Lower, M. E. McSweeney, Sam Ravi, V. Barr, E. D. Buchner, S. Flynn, C. M. L. Hessels, J. W. T. Kramer, M. Pritchard, J. Stappers, B. W. |
| contents | Long-period radio transients are an emerging class of extreme astrophysical events of which only three are known. These objects emit highly polarised, coherent pulses of typically a few tens of seconds duration and minutes to hour-long periods. While magnetic white dwarfs and magnetars, either isolated or in binary systems, have been invoked to explain these objects, a consensus has not emerged. Here we report on the discovery of ASKAP J193505.1+214841.0 (henceforth ASKAPJ1935+2148) with a period of 53.8 minutes exhibiting three distinct emission states - a bright pulse state with highly linearly polarised pulses with widths of 10-50 seconds; a weak pulse state which is about 26 times fainter than the bright state with highly circularly polarised pulses of widths of approximately 370 milliseconds; and a quiescent or quenched state with no pulses. The first two states have been observed to progressively evolve over the course of 8 months with the quenched state interspersed between them suggesting physical changes in the region producing the emission. A constraint on the radius of the source for the observed period rules out a magnetic white dwarf origin. Unlike other long-period sources, ASKAPJ1935+2148 is the first to exhibit drastic variations in emission modes reminiscent of neutron stars. However, its radio properties challenge our current understanding of neutron star emission and evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_12266 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An emission state switching radio transient with a 54 minute period Caleb, M. Lenc, E. Kaplan, D. L. Murphy, T. Men, Y. P. Shannon, R. M. Ferrario, L. Rajwade, K. M. Clarke, T. E. Giacintucci, S. Hurley-Walker, N. Hyman, S. D. Lower, M. E. McSweeney, Sam Ravi, V. Barr, E. D. Buchner, S. Flynn, C. M. L. Hessels, J. W. T. Kramer, M. Pritchard, J. Stappers, B. W. High Energy Astrophysical Phenomena Long-period radio transients are an emerging class of extreme astrophysical events of which only three are known. These objects emit highly polarised, coherent pulses of typically a few tens of seconds duration and minutes to hour-long periods. While magnetic white dwarfs and magnetars, either isolated or in binary systems, have been invoked to explain these objects, a consensus has not emerged. Here we report on the discovery of ASKAP J193505.1+214841.0 (henceforth ASKAPJ1935+2148) with a period of 53.8 minutes exhibiting three distinct emission states - a bright pulse state with highly linearly polarised pulses with widths of 10-50 seconds; a weak pulse state which is about 26 times fainter than the bright state with highly circularly polarised pulses of widths of approximately 370 milliseconds; and a quiescent or quenched state with no pulses. The first two states have been observed to progressively evolve over the course of 8 months with the quenched state interspersed between them suggesting physical changes in the region producing the emission. A constraint on the radius of the source for the observed period rules out a magnetic white dwarf origin. Unlike other long-period sources, ASKAPJ1935+2148 is the first to exhibit drastic variations in emission modes reminiscent of neutron stars. However, its radio properties challenge our current understanding of neutron star emission and evolution. |
| title | An emission state switching radio transient with a 54 minute period |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2407.12266 |