Radio Continuum Studies of Ultracompact and Short Orbital Period X-Ray Binaries

Abstract We present the radio continuum counterparts to the enigmatic ultracompact X-ray binaries (UCXBs): a black hole or neutron star accreting from a hydrogen-deficient white dwarf donor star with short orbital periods (<80 minutes). For the sample of UCXBs hosted by globular clusters (GCs), we search for whether certain GC properties are more likely to enhance UCXB formation. We determine that GCs that host UCXBs are drawn from a distinct population in terms of cluster concentration, core radius, and half-light radius, but are similar to other well-studied GCs in metallicity and cluster mass. In particular, UCXB-hosting GCs tend to be on average more compact, with a higher concentration than other GCs, with significantly higher encounter rates. We investigate whether a correlation exists between radio luminosity and orbital period, using new and archival observations. We determine that there is not a clear connection between the two observable quantities.

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Publication Details

Journal
The Astrophysical Journal
Published
2025-07-18
DOI
https://doi.org/10.3847/1538-4357/adea41
Citations
1
Primary Topic
Astrophysical Phenomena and Observations
Type
article
Field-Weighted Citation Impact
1.15
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article

Radio Continuum Studies of Ultracompact and Short Orbital Period X-Ray Binaries

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1 citations
The Astrophysical Journal
Astrophysical Phenomena and Observations
1.15
article

Radio Continuum Studies of Ultracompact and Short Orbital Period X-Ray Binaries

C. O. Heinke, Susmita Sett, M. Armas Padilla, Payaswini Saikia, A. W. Shaw, Edward M. Cackett, Kwangmin Oh, S. Malu, Teresa Panurach, Richard M. Plotkin, Alexandra J. Tetarenko, Timothy J. Galvin, Arash Bahramian, Kristen C. Dage, R. M. Ludlam, Angiraben D. Mahida
article en
1 citations

Abstract

Abstract We present the radio continuum counterparts to the enigmatic ultracompact X-ray binaries (UCXBs): a black hole or neutron star accreting from a hydrogen-deficient white dwarf donor star with short orbital periods (<80 minutes). For the sample of UCXBs hosted by globular clusters (GCs), we search for whether certain GC properties are more likely to enhance UCXB formation. We determine that GCs that host UCXBs are drawn from a distinct population in terms of cluster concentration, core radius, and half-light radius, but are similar to other well-studied GCs in metallicity and cluster mass. In particular, UCXB-hosting GCs tend to be on average more compact, with a higher concentration than other GCs, with significantly higher encounter rates. We investigate whether a correlation exists between radio luminosity and orbital period, using new and archival observations. We determine that there is not a clear connection between the two observable quantities.

The Astrophysical JournalVol. 988(1)
Openalex Percentile: Top 17%
Astrophysical Phenomena and Observations
1.15
DOIOpen Access PDFOpenAlex
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