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Abstract：
Type-I X-ray bursts are rapidly brightening phenomena triggered by the nuclear burning of light elements near the surface of accreting neutron stars. Observed light curves are sensitive to many model parameters such as accretion rate, the composition of accreted matter, reaction rates, neutron star structure, and temperature. In this talk, we focus on neutron-star cooling effects inside the core, above all for one of the fast neutrino cooling processes, the direct Urca process. It decreases the temperature not only inside NSs but also the surface, though it could be suppressed by nucleon superfluidity. We find that the direct Urca process leads to a longer recurrence time and higher peak luminosity, whose effects could become smaller by neutron superfluidity. We also apply our burst models to the comparison with Clocked burster GS 1826−24, and to the recurrence time of a long X-ray burster 4U 1820-30 triggered by carbon ignition.
Biography:
Postdoctoral Fellow at Theoretical Astrophysics Group in Hiroshima University
Visiting Researcher at RIKEN iTHEMS
PhD, Kyushu University, JAPAN (Sep 2022)
MSc, Kyushu University, JAPAN (Mar 2020)
BA, Kyushu University, JAPAN (Mar 2018)
RESEARCH TOPICS:
Thermal Evolution of Neutron Stars
Probing Exotic Physics through Compact Stars
Online meeting room：https://cern.zoom.us/j/63235717321?pwd=aXUyUkpHWDJsdXhGbWQzNnJTaFZOQT09
（ID: 632 3571 7321 Passcode: 123456）