Speaker
Description
Several indirect observations imply that the central compact object in the supernova SN 1987A is likely to be the youngest neutron star NS 1987A. Although no direct observation on the NS 1987A has been made yet, a future high-resolution X-ray satellite, such as the Lynx, could potentially detect its thermal emission. We investigate when the NS 1987A can be detected with the use of Lynx, adopting neutron-star cooling models and free-expansion approximation of the ejecta. We found that the NS 1987A is detectable by Lynx with $t\sim60~{\rm yr}$ (roughly 2050) unless it causes the rapid neutrino cooling, such as the direct Urca process. At the detection age of NS 1987A, its internal temperature profile is likely to be isothermal, but not for weak neutron superfluidity in the inner crust. In that case, the future direct observation of NS 1987A is a potential probe to the properties inside the inner crust.