A new long-period radio transient: discovery of pulses repeating every 1.16 h from ASKAP J175534.9−252749.1

ABSTRACT We report the discovery of several new pulses from the source ASKAP J175534.9–252749.1 (J1755–2527), originally identified from a single 2-min long pulse, confirming it as a long-period transient (LPT) with a period of ${\sim }1.16\,$ h. The pulses are significantly scattered, consistent with Galactic electron density models. Two of the new pulses also had measurable polarization, but unlike the originally detected pulse, the polarization angle does not behave as expected from the rotating vector model. We interpret historical non-detections of J1755–2527 as an intrinsic intermittency that occurs on month-long time-scales, and discuss possible causes. We conjecture that, like some other LPTs with periods $\gtrsim 1\,$ h, J1755–2527 may host a white dwarf in a binary orbit, but note that its period is marginally shorter than the canonical orbital period minimum of cataclysmic variables. Our work highlights the importance of additional observations in establishing the nature of unusual radio-emitting objects.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2025-07-12
DOI
https://doi.org/10.1093/mnras/staf1203
Citations
9
Primary Topic
Pulsars and Gravitational Waves Research
Type
article
Field-Weighted Citation Impact
10.39

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article

A new long-period radio transient: discovery of pulses repeating every 1.16 h from ASKAP J175534.9−252749.1

Christopher Horvath, Akash Anumarlapudi, K. Rose, David L. Kaplan et al.
9 citations
Monthly Notices of the Royal Astronomical Society
Pulsars and Gravitational Waves Research
10.39
article

A new long-period radio transient: discovery of pulses repeating every 1.16 h from ASKAP J175534.9−252749.1

Christopher Horvath, Akash Anumarlapudi, K. Rose, David L. Kaplan, S. J. McSweeney, N. Hurley‐Walker, John Morgan, Dougal Dobie, A. Waszewski, Ziteng Wang
article en
9 citations

Abstract

ABSTRACT We report the discovery of several new pulses from the source ASKAP J175534.9–252749.1 (J1755–2527), originally identified from a single 2-min long pulse, confirming it as a long-period transient (LPT) with a period of ${\sim }1.16\,$ h. The pulses are significantly scattered, consistent with Galactic electron density models. Two of the new pulses also had measurable polarization, but unlike the originally detected pulse, the polarization angle does not behave as expected from the rotating vector model. We interpret historical non-detections of J1755–2527 as an intrinsic intermittency that occurs on month-long time-scales, and discuss possible causes. We conjecture that, like some other LPTs with periods $\gtrsim 1\,$ h, J1755–2527 may host a white dwarf in a binary orbit, but note that its period is marginally shorter than the canonical orbital period minimum of cataclysmic variables. Our work highlights the importance of additional observations in establishing the nature of unusual radio-emitting objects.

Monthly Notices of the Royal Astronomical SocietyVol. 542(1)
Commonwealth Scientific and Industrial Research Organisation (AU), The University of Sydney (AU), Australia Telescope National Facility (AU), Curtin University (AU), ARC Centre of Excellence for Gravitational Wave Discovery (AU), Astronomy and Space (AU), International Centre for Radio Astronomy Research (AU), University of Wisconsin–Milwaukee (US)
Australian Government
Openalex Percentile: Top 2%
Pulsars and Gravitational Waves Research
10.39
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