期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
卷 37, 期 -, 页码 -出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/pasa.2020.31
关键词
binaries; common envelope; mass transfer; neutron stars; population synthesis
资金
- Consejo Nacional de Ciencia y Tecnologia (CONACYT)
- Danish National Research Foundation [DNRF132]
- NASA through Einstein Postdoctoral Fellowship - Chandra X-ray Center [PF6-170169]
- NASA [NAS8-03060]
- National Science Foundation [1909203]
- Netherlands Organization for Scientific Research (NWO) as part of the Vidi research programme BinWaves [639.042.728]
- European Union's Horizon 2020 research and innovation programme from the European Research Council (ERC) [715063]
- Australian Research Council [FT190100574]
Close double neutron stars (DNSs) have been observed as Galactic radio pulsars, while their mergers have been detected as gamma-ray bursts and gravitational wave sources. They are believed to have experienced at least one common envelope episode (CEE) during their evolution prior to DNS formation. In the last decades, there have been numerous efforts to understand the details of the common envelope (CE) phase, but its computational modelling remains challenging. We present and discuss the properties of the donor and the binary at the onset of the Roche lobe overflow (RLOF) leading to these CEEs as predicted by rapid binary population synthesis models. These properties can be used as initial conditions for detailed simulations of the CE phase. There are three distinctive populations, classified by the evolutionary stage of the donor at the moment of the onset of the RLOF: giant donors with fully convective envelopes, cool donors with partially convective envelopes, and hot donors with radiative envelopes. We also estimate that, for standard assumptions, tides would not circularise a large fraction of these systems by the onset of RLOF. This makes the study and understanding of eccentric mass-transferring systems relevant for DNS populations.
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