TY - JOUR
T1 - Quiescent light curve of accreting neutron star MAXI J0556-332
AU - Liu, Helei
AU - Matsuo, Yasuhide
AU - Hashimoto, Masa aki
AU - Noda, Tsuneo
AU - Fujimoto, Masayuki Y.
N1 - Funding Information:
Acknowledgment We would like to thank Kenzo Arai for useful comments. This work was supported by JSPS KAKENHI Grant Numbers 24540278, 15K05083 and by a China Scholarship Council.
Publisher Copyright:
© 2017 The Physical Society of Japan
PY - 2017/12/15
Y1 - 2017/12/15
N2 - MAXI J0556-332 is the hottest transient accreting neutron star at the beginning of its quiescence. A theoretical model with crustal heating indicates that an additional shallow heat source of Qshallow > 6 MeV per accreted nucleon is required in the shallow outer crust with respect to the deeper star crust by considering the observed decline in accretion rate at the end of outburst. However, the physical source of this shallow heating is still unclear. In the present investigation, we performed stellar evolutionary calculations, adopting the effects of outburst behavior of the accretion rate. As a consequence, we find that the quiescent light curve of MAXI J0556-332 can be well explained by the nuclear energy generation due to the hot CNO cycle.
AB - MAXI J0556-332 is the hottest transient accreting neutron star at the beginning of its quiescence. A theoretical model with crustal heating indicates that an additional shallow heat source of Qshallow > 6 MeV per accreted nucleon is required in the shallow outer crust with respect to the deeper star crust by considering the observed decline in accretion rate at the end of outburst. However, the physical source of this shallow heating is still unclear. In the present investigation, we performed stellar evolutionary calculations, adopting the effects of outburst behavior of the accretion rate. As a consequence, we find that the quiescent light curve of MAXI J0556-332 can be well explained by the nuclear energy generation due to the hot CNO cycle.
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U2 - 10.7566/JPSJ.86.123901
DO - 10.7566/JPSJ.86.123901
M3 - Article
AN - SCOPUS:85039837876
SN - 0031-9015
VL - 86
JO - journal of the physical society of japan
JF - journal of the physical society of japan
IS - 12
M1 - 123901
ER -