The newly discovered Be/X-ray binary Swift J004516.6–734703 in the SMC: witnessing the emergence of a circumstellar disc

Author:

Kennea J A1ORCID,Coe M J2ORCID,Evans P A3ORCID,Monageng I M45ORCID,Townsend L J4ORCID,Siegel M H1,Udalski A6,Buckley D A H4ORCID

Affiliation:

1. Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA

2. Physics and Astronomy, The University of Southampton, Southampton SO17 1BJ, UK

3. University of Leicester, X-ray and Observational Astronomy Research Group, School of Physics and Astronomy, University Road, Leicester LE1 7RH, UK

4. South African Astronomical Observatory, P.O. Box 9, Observatory, Cape Town 7935, South Africa

5. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa

6. Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, PL-00-478 Warszawa, Poland

Abstract

ABSTRACT We report on the discovery of Swift J004516.6–734703, a Be/X-ray binary system by the Swift SMC Survey, S-CUBED. Swift J004516.6–734703, or SXP 146.6, was found to be exhibiting a bright (∼1037 erg s−1) X-ray outburst on 2020 June 18. The historical UV and IR light-curves from OGLE and Swift/UVOT showed that after a long period of steady brightness, it experienced a significant brightening beginning around 2019 March. This IR/UV rise is likely the signature of the formation of a circumstellar disc, confirmed by the presence of strong an H α line in SALT spectroscopy, that was not previously present. Periodicity analysis of the OGLE data reveals a plausible 426 d binary period, and in X-ray a pulsation period of 146.6 s is detected. The onset of X-ray emission from Swift J004516.6–734703 is likely the signature of a Type-I outburst from the first periastron passage of the neutron star companion through the newly formed circumstellar disc. We note that the formation of the circumstellar disc began at the predicted time of the previous periastron passage, suggesting its formation was spurred by tidal interaction with the neutron star.

Funder

Narodowe Centrum Nauki

National Aeronautics and Space Administration

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Discovery of a Rare Eclipsing Be/X-Ray Binary System, Swift J010902.6-723710 = SXP 182;The Astrophysical Journal Letters;2024-04-01

2. The 2022 super-Eddington outburst of the source SMC X-2;Monthly Notices of the Royal Astronomical Society;2024-02-15

3. Swift J011511.0-725611: discovery of a rare Be star/white dwarf binary system in the SMC;Monthly Notices of the Royal Astronomical Society;2021-09-15

4. RX J0529.8−6556: a BeXRB pulsar with an evolving optical period and out of phase X-ray outbursts;Monthly Notices of the Royal Astronomical Society;2021-03-19

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