Prospects of Searching for Type Ia Supernovae with 2.5-m Wide Field Survey Telescope by Maokai Hu, Lei Hu, Ji-an Jiang, Lin Xiao, Lulu Fan, Junjie Wei, Xuefeng Wu

“…Type Ia supernovae (SNe Ia) are thermonuclear explosions of carbon-oxygen white dwarfs (WDs) and are well-known as a distance indicator. …”
Get full text

A 1.9 solar-mass neutron star candidate in a 2-year orbit by Kareem El-Badry, Joshua D. Simon, Henrique Reggiani, Hans-Walter Rix, David W. Latham, Allyson Bieryla, Lars A. Buchhave, Sahar Shahaf, Tsevi Mazeh, Sukanya Chakrabarti, Puragra Guhathakurta, Ilya V. Ilyin, Thomas M. Tauris

“…The companion is most likely a massive neutron star: the only viable alternative is two massive white dwarfs in a close binary, but this scenario is disfavored on evolutionary grounds. …”
Get full text

Discovery and Timing of Millisecond Pulsars in the Globular Cluster M5 with FAST and Arecibo by Lei Zhang, Paulo C. C. Freire, Alessandro Ridolfi, Zhichen Pan, Jiaqi Zhao, Craig O. Heinke, Jianxing Chen, Mario Cadelano, Cristina Pallanca, Xian Hou, Xiaoting Fu, Shi Dai, Erbil Gügercinoğlu, Meng Guo, Jason Hessels, Jiale Hu, Guodong Li, Mengmeng Ni, Jingshan Pan, Scott M. Ransom, Qitong Ruan, Ingrid Stairs, Chao-Wei Tsai, Pei Wang, Long Wang, Na Wang, Qingdong Wu, Jianping Yuan, Jie Zhang, Weiwei Zhu, Yongkun Zhang, Di Li

“…The binary pulsars M5D, M5E, and M5F are confirmed to be in low-eccentricity binary systems, the low-mass companions of which are newly identified to be He white dwarfs using Hubble Space Telescope data. Four pulsars are also found to be associated with X-ray sources. …”
Get full text

Spectroscopic Follow-up on Potential Magnetic Cataclysmic Variables by Paula Szkody, Jan van Roestel, Paul A. Mason, Colin Littlefield, R. Michael Rich, Eric C. Bellm, Filipp D. Romanov, Brian F. Healy, Theophile Jegou du Laz, Russ R. Laher, Ben Rusholme

“…Spectroscopic observations of nine cataclysmic variables that have been postulated to contain magnetic white dwarfs were obtained to further characterize their classifications, orbital parameters, inclinations, and/or accretion properties. …”
Get full text

Mass Distribution for Single-lined Hot Subdwarf Stars in LAMOST by Zhenxin Lei, Ruijie He, Péter Németh, Xuan Zou, Huaping Xiao, Yong Yang, Jingkun Zhao

“…By comparing the observed mass distributions to the predictions of different formation scenarios, we concluded that the binary merger channel, including two helium white dwarfs (He-WDs) and He-WD + main-sequence mergers, cannot be the only main formation channel for He-rich hot subdwarfs, and other formation channels, such as the surviving companions from Type Ia supernovae, could also make impacts on producing this special population, especially for He-rich hot subdwarfs with masses less than 0.44 M _⊙ . …”
Get full text

Induced Gravitational Collapse, Binary-Driven Hypernovae, Long Gramma-ray Bursts and Their Connection with Short Gamma-ray Bursts by J. A. Rueda, R. Ruffini, Y. Wang

“…The binary components involve carbon-oxygen cores (CO<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mi>core</mi> </msub> </semantics> </math> </inline-formula>), neutron stars (NSs), black holes (BHs), and white dwarfs (WDs). We review here the salient features of the specific class of binary-driven hypernovae (BdHNe) within the induced gravitational collapse (IGC) scenario for the explanation of the long GRBs. …”
Get full text