Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 935, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ac87f9
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Funding
- NASA through the NICER Guest Observer Program
- CRESST II cooperative agreement [80GSFC21M0002]
- CNES
- Royal Society
- Proyecto de Investigacion Plurianual (PIP) (Nacional de Investigaciones Cientificas y Tecnicas (CONICET))
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT) [PICT-2017-2865]
- NASA [NNG200808A]
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We present the discovery of 528.6 Hz pulsations in the new X-ray transient MAXI J1816-195, which helps to understand the characteristics of this celestial object.
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 (circle dot). 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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