The Discovery of the 528.6 Hz Accreting Millisecond X-Ray Pulsar MAXI J1816–195

Bult, Peter and Altamirano, Diego and Arzoumanian, Zaven and Chakrabarty, Deepto and Chenevez, Jérôme and Ferrara, Elizabeth C. and Gendreau, Keith C. and Guillot, Sebastien and Güver, Tolga and Iwakiri, Wataru and Jaisawal, Gaurava K. and Mancuso, Giulio C. and Malacaria, Christian and Ng, Mason and Sanna, Andrea and Strohmayer, Tod E. and Wadiasingh, Zorawar and Wolff, Michael T. (2022) The Discovery of the 528.6 Hz Accreting Millisecond X-Ray Pulsar MAXI J1816–195. The Astrophysical Journal Letters, 935 (2). L32. ISSN 2041-8205

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Abstract

We present the discovery of 528.6 Hz pulsations in the new X-ray transient MAXI J1816–195. Using NICER, we observed the first recorded transient outburst from the neutron star low-mass X-ray binary MAXI J1816–195 over a period of 28 days. From a timing analysis of the 528.6 Hz pulsations, we find that the binary system is well described as a circular orbit with an orbital period of 4.8 hr and a projected semimajor axis of 0.26 lt-s for the pulsar, which constrains the mass of the donor star to 0.10–0.55 M⊙. Additionally, we observed 15 thermonuclear X-ray bursts showing a gradual evolution in morphology over time, and a recurrence time as short as 1.4 hr. We did not detect evidence for photospheric radius expansion, placing an upper limit on the source distance of 8.6 kpc.

Item Type: Article
Subjects: Middle Asian Archive > Physics and Astronomy
Depositing User: Managing Editor
Date Deposited: 24 Apr 2023 06:40
Last Modified: 14 Apr 2025 12:57
URI: http://peerreview.go2articles.com/id/eprint/316

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