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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
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 hours and a projected semi-major axis of 0.26 light-seconds for the pulsar, which constrains the mass of the donor star to $0.10-0.55 M_\odot$. 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 hours. 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
2041-8205
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.
d49dd445-cbeb-4d17-b4ed-c48ff104d50c
Bult, Peter
73bd0a3d-c566-4046-86c9-31f6e6cdac07
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Arzoumanian, Zaven
5befbba6-f6a1-47c8-ae9e-021c5d854a64
Chakrabarty, Deepto
ab15428f-ccef-43f7-a5b2-25bb124e22b6
Chenevez, Jérôme
25a95602-9e3d-4553-a442-5f4317ff2cd6
Ferrara, Elizabeth C.
65915a6a-f7d3-45a9-8271-7efe0109841c
Gendreau, Keith C.
5749fe9f-0e85-45da-a97d-32924bed3a2e
Guillot, Sebastien
307953c0-47da-4e92-8caf-5ae719f02c52
Güver, Tolga
42c68e75-5602-4ddf-a230-07264c1308f4
Iwakiri, Wataru
f775fbdf-db7e-4f07-afdf-67067173a1c5
Jaisawal, Gaurava K.
4d5dcd39-0881-426d-8ad7-f378238405ae
Mancuso, Giulio C.
ac7509c1-5491-4d83-8835-05ae6ba1db01
Malacaria, Christian
309a8f91-28a7-4365-b0a3-633171fc2e51
Ng, Mason
1ea126a4-d65f-4ea4-a97b-dd8620d745e4
Sanna, Andrea
2c05dccc-d674-4ca7-b324-730eb73d6a36
Strohmayer, Tod E.
e1a6de84-d23d-43de-b33e-2d49c4a5daa7
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).

Record type: Article

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 hours and a projected semi-major axis of 0.26 light-seconds for the pulsar, which constrains the mass of the donor star to $0.10-0.55 M_\odot$. 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 hours. 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
e-pub ahead of print date: 22 August 2022
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
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 22 Nov 2022 17:59
Last modified: 24 Nov 2022 02:46

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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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