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  Is the black-widow pulsar PSR J1555-2908 in a hierarchical triple system?

Nieder, L., Kerr, M., Clark, C. J., Bruel, P., Cromartie, H. T., Ransom, S. M., et al. (2022). Is the black-widow pulsar PSR J1555-2908 in a hierarchical triple system? The Astrophysical Journal Letters, 931(1): L3. doi:10.3847/2041-8213/ac6b35.

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 Creators:
Nieder, L.1, Author              
Kerr, M., Author
Clark, C. J.1, Author              
Bruel, P., Author
Cromartie, H. T., Author
Ransom, S. M., Author
Ray, P. S., Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: The 559 Hz black-widow pulsar PSR J1555-2908, originally discovered in radio, is also a bright gamma-ray pulsar. Timing its pulsations using 12 yr of Fermi-LAT gamma-ray data reveals long-term variations in its spin frequency that are much larger than is observed from other millisecond pulsars. While this variability in the pulsar rotation rate could be intrinsic "timing noise", here we consider an alternative explanation: the variations arise from the presence of a very-low-mass third object in a wide multi-year orbit around the neutron star and its low-mass companion. With current data, this hierarchical-triple-system model describes the pulsar's rotation slightly more accurately than the best-fitting timing-noise model. Future observations will show if this alternative explanation is correct.

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 Dates: 2022-02-112022
 Publication Status: Published in print
 Pages: 6 pages, 2 figures, submitted to ApJL
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 Rev. Type: -
 Identifiers: arXiv: 2202.05482
DOI: 10.3847/2041-8213/ac6b35
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Title: The Astrophysical Journal Letters
Source Genre: Journal
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Pages: - Volume / Issue: 931 (1) Sequence Number: L3 Start / End Page: - Identifier: -