期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 470, 期 2, 页码 1788-1808出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx1290
关键词
hydrodynamics; binaries: close; stars: mass-loss
资金
- Science and Technology Facilities Council [ST/K502236/1]
- Canada Research Chairs programme
- NSERC
- Strategic Priority Research Program of the Chinese Academy of Sciences 'Multi-waveband Gravitational Wave Universe' [XDB23040000]
- Chinese Academy of Sciences (President's International Fellowship Initiative) [2011Y2JB07]
- National Natural Science Foundation of China [11250110055, 11350110324, 11633005]
- National Science Foundation [PHY-1066293, NSF PHY11-25915]
- STFC [ST/K502236/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K502236/1, 1527587] Funding Source: researchfish
After the initial fast spiral-in phase experienced by a common-envelope binary, the system may enter a slow, self-regulated phase, possibly lasting hundreds of years, in which all the energy released by orbital decay can be efficiently transported to the surface, where it is radiated away. If the remaining envelope is to be removed during this phase, this removal must occur through some as-yet-undetermined mechanism. We carried out 1D hydrodynamic simulations of a low-mass red giant undergoing a synthetic common-envelope event in such a slow spiral-in phase, using the stellar evolutionary code MESA. We simulated the heating of the envelope due to frictional dissipation from a binary companion's orbit in multiple configurations and investigated the response of the giant's envelope. We find that our model envelopes become dynamically unstable and develop large-amplitude pulsations, with periods in the range 3-20 yr and very short growth time-scales of similar order. The shocks and associated rebounds that emerge as these pulsations grow are in some cases strong enough to dynamically eject shells of matter of up to 0.1 M circle dot, similar to 10 per cent of the mass of the envelope, from the stellar surface at above escape velocity. These ejections are seen to repeat within a few decades, leading to a time-averaged mass-loss rate of the order of 10-3 M circle dot yr(-1), which is sufficiently high to represent a candidate mechanism for removing the entire envelope over the duration of the slow spiral-in phase.
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