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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Monitoring observations of SMC X-1’s excursions (MOOSE) – II. A new excursion accompanies spin-up acceleration
Monthly Notices of the Royal Astronomical Society, Volume 520, No. 3, Year 2023
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Description
SMC X-1 is a high-mass X-ray binary showing superorbital modulation with an unstable period. Previous monitoring shows three excursion events in 1996–1998, 2005–2007, and 2014–2016. The superorbital period drifts from 60 to 40 d and then evolves back during an excursion. Here, we report a new excursion event of SMC X-1 in 2020–2021, indicating that the superorbital modulation has an unpredictable, chaotic nature. We trace the spin-period evolution and find that the spin-up rate accelerated 1 yr before the onset of this new excursion, which suggests a possible inside-out process connecting the spin-up acceleration and the superorbital excursion. This results in a deviation of the spin-period residual, similar to the behaviour of the first excursion in 1996–1998. In further analysis of the pulse profile evolution, we find that the pulsed fraction shows a long-term evolution and may be connected to the superorbital excursion. These discoveries deepen the mystery of SMC X-1 because they cannot be solely interpreted by the warped-disc model. Upcoming pointed observations and theoretical studies may improve our understanding of the detailed accretion mechanisms taking place. © 2023 Oxford University Press. All rights reserved.
Authors & Co-Authors
Hu, Chinping
Taiwan, Changhua
National Changhua University of Education
Clarkson, William I.
United States, Dearborn
University of Michigan-dearborn
Charles, Philip A.
United Kingdom, Southampton
University of Southampton
Haggard, Daryl
Canada, Montreal
Université Mcgill
Canada, Montreal
Trottier Space Institute at Mcgill
Hickox, Ryan C.
United States, Hanover
Dartmouth College
Mihara, Tatehiro
Japan, Wako
Riken the Institute of Physical and Chemical Research
Bahramian, Arash
Australia, Perth
Curtin University
Altamirano, Diego
United Kingdom, Southampton
University of Southampton
Neilsen, Joseph
United States, Villanova
Villanova University
Kennea, Jamie A.
United States, University Park
Pennsylvania State University
Statistics
Citations: 2
Authors: 10
Affiliations: 12
Identifiers
Doi:
10.1093/mnras/stad384
ISSN:
00358711