The discovery of the 528.6 Hz accreting millisecond X-ray pulsar MAXI J1816-195
The discovery of the 528.6 Hz accreting millisecond X-ray pulsar MAXI J1816-195
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.
Astrophysics - High Energy Astrophysical Phenomena
Bult, Peter
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Altamirano, Diego
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Arzoumanian, Zaven
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Chakrabarty, Deepto
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Chenevez, Jérôme
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Ferrara, Elizabeth C.
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Gendreau, Keith C.
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Guillot, Sebastien
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Güver, Tolga
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Iwakiri, Wataru
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Jaisawal, Gaurava K.
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Mancuso, Giulio C.
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Malacaria, Christian
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Ng, Mason
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Sanna, Andrea
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Strohmayer, Tod E.
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Wadiasingh, Zorawar
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Wolff, Michael T.
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22 August 2022
Bult, Peter
73bd0a3d-c566-4046-86c9-31f6e6cdac07
Altamirano, Diego
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Arzoumanian, Zaven
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Chakrabarty, Deepto
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Chenevez, Jérôme
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Ferrara, Elizabeth C.
65915a6a-f7d3-45a9-8271-7efe0109841c
Gendreau, Keith C.
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Guillot, Sebastien
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Güver, Tolga
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Iwakiri, Wataru
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Jaisawal, Gaurava K.
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Mancuso, Giulio C.
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Malacaria, Christian
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Ng, Mason
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Sanna, Andrea
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Strohmayer, Tod E.
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Wadiasingh, Zorawar
987ff233-a0cc-4fac-bcfe-9d28049e0ab0
Wolff, Michael T.
d49dd445-cbeb-4d17-b4ed-c48ff104d50c
Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Chakrabarty, Deepto, Chenevez, Jérôme, Ferrara, Elizabeth C., Gendreau, Keith C., Guillot, Sebastien, Güver, Tolga, Iwakiri, Wataru, Jaisawal, Gaurava K., Mancuso, Giulio C., Malacaria, Christian, Ng, Mason, Sanna, Andrea, Strohmayer, Tod E., 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].
(doi:10.3847/2041-8213/ac87f9).
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.
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Accepted/In Press date: 8 August 2022
Published date: 22 August 2022
Additional Information:
Funding Information:
This work made use of data and software provided by the High Energy Astrophysics Science Archive Research Center (HEASARC). P.B. acknowledges support from NASA through the NICER Guest Observer Program and the CRESST II cooperative agreement (80GSFC21M0002). S.G. acknowledges the support of the CNES. D.A. acknowledges support from the Royal Society. G.C.M. was partially supported by Proyecto de Investigación Plurianual (PIP) 0102 (Nacional de Investigaciones Científicas y Técnicas (CONICET)) and from PICT-2017-2865 (Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT)). NICER science team members at NRL are supported by NASA under Interagency Agreement NNG200808A.
Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
Keywords:
Astrophysics - High Energy Astrophysical Phenomena
Identifiers
Local EPrints ID: 471938
URI: http://eprints.soton.ac.uk/id/eprint/471938
ISSN: 2041-8205
PURE UUID: ddfc2fec-f1df-4b53-a19d-620f6d32ff72
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Date deposited: 22 Nov 2022 17:59
Last modified: 12 Nov 2024 02:49
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Contributors
Author:
Peter Bult
Author:
Zaven Arzoumanian
Author:
Deepto Chakrabarty
Author:
Jérôme Chenevez
Author:
Elizabeth C. Ferrara
Author:
Keith C. Gendreau
Author:
Sebastien Guillot
Author:
Tolga Güver
Author:
Wataru Iwakiri
Author:
Gaurava K. Jaisawal
Author:
Giulio C. Mancuso
Author:
Christian Malacaria
Author:
Mason Ng
Author:
Andrea Sanna
Author:
Tod E. Strohmayer
Author:
Zorawar Wadiasingh
Author:
Michael T. Wolff
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