In spite of the importance of studying the cosmic generation of heavy elements through the r-process,the detection of a kilonova resulting from the merger of a neutron star binary is still a challenging task.In this p...In spite of the importance of studying the cosmic generation of heavy elements through the r-process,the detection of a kilonova resulting from the merger of a neutron star binary is still a challenging task.In this paper,we show that the Visible Telescope(VT)onboard the ongoing SVOM space mission is powerful for identifying kilonova candidates associated with short gamma-ray bursts up to a distance of 600 Mpc.A significant color variation,turning blue and then turning red,is revealed by calculating the light curves in both red and blue channels of VT by a linear combination of an afterglow and an associated kilonova.The maximum color variation is as high as~0.5-1 mag,which is far larger than the small photometry error of~0.2 mag of VT for a point source with a brightness of 23 mag.Up to a distance of 600 Mpc,~1-2 kilonova candidates per year are predicted to be identified by VT.展开更多
The motion of the moonlet Dactyl in the binary system 243 Ida is investigated in this paper. First, periodic orbits in the vicinity of the primary are calculated, including the orbits around the equilibrium points and...The motion of the moonlet Dactyl in the binary system 243 Ida is investigated in this paper. First, periodic orbits in the vicinity of the primary are calculated, including the orbits around the equilibrium points and large-scale orbits. The Floquet multipliers’ topological cases of periodic orbits are calculated to study the orbits’ stabilities. During the continuation of the retrograde near-circular orbits near the equatorial plane, two period-doubling bifurcations and one Neimark–Sacker bifurcation occur one by one, leading to two stable regions and two unstable regions. Bifurcations occur at the boundaries of these regions. Periodic orbits in the stable regions are all stable, but in the unstable regions are all unstable. Moreover, many quasi-periodic orbits exist near the equatorial plane. Long-term integration indicates that a particle in a quasi-periodic orbit runs in a space like a tire. Quasi-periodic orbits in different regions have different styles of motion indicated by the Poincare sections. There is the possibility that moonlet Dactyl is in a quasi-periodic orbit near the stable region I, which is enlightening for the stability of the binary system.展开更多
基金supported by the Strategic Pioneer Program on Space Science,Chinese Academy of Sciences,grant XDB0550401supported by the National Natural Science Foundation of China(NSFC,grant No.12173009)+2 种基金by the Natural Science Foundation of Guangxi(2020GXNSFDA238018)by the Bagui Young Scholars Programsupported by the National Postdoctoral Program for Innovative Talents(grant No.GZB20230765)。
文摘In spite of the importance of studying the cosmic generation of heavy elements through the r-process,the detection of a kilonova resulting from the merger of a neutron star binary is still a challenging task.In this paper,we show that the Visible Telescope(VT)onboard the ongoing SVOM space mission is powerful for identifying kilonova candidates associated with short gamma-ray bursts up to a distance of 600 Mpc.A significant color variation,turning blue and then turning red,is revealed by calculating the light curves in both red and blue channels of VT by a linear combination of an afterglow and an associated kilonova.The maximum color variation is as high as~0.5-1 mag,which is far larger than the small photometry error of~0.2 mag of VT for a point source with a brightness of 23 mag.Up to a distance of 600 Mpc,~1-2 kilonova candidates per year are predicted to be identified by VT.
基金supported by the National Natural Science Foundation of China (Grant 11572166)
文摘The motion of the moonlet Dactyl in the binary system 243 Ida is investigated in this paper. First, periodic orbits in the vicinity of the primary are calculated, including the orbits around the equilibrium points and large-scale orbits. The Floquet multipliers’ topological cases of periodic orbits are calculated to study the orbits’ stabilities. During the continuation of the retrograde near-circular orbits near the equatorial plane, two period-doubling bifurcations and one Neimark–Sacker bifurcation occur one by one, leading to two stable regions and two unstable regions. Bifurcations occur at the boundaries of these regions. Periodic orbits in the stable regions are all stable, but in the unstable regions are all unstable. Moreover, many quasi-periodic orbits exist near the equatorial plane. Long-term integration indicates that a particle in a quasi-periodic orbit runs in a space like a tire. Quasi-periodic orbits in different regions have different styles of motion indicated by the Poincare sections. There is the possibility that moonlet Dactyl is in a quasi-periodic orbit near the stable region I, which is enlightening for the stability of the binary system.
