Kavli Affiliate: Deepto Chakrabarty
| First 5 Authors: Peter Bult, Diego Altamirano, Zaven Arzoumanian, Deepto Chakrabarty, Jérôme Chenevez
| Summary:
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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