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- W4226084013 endingPage "5009" @default.
- W4226084013 startingPage "4993" @default.
- W4226084013 abstract "Recent surveys show that wide ($>10^4$ AU) binaries and triples are abundant in the field. We study the long-term evolution of wide hierarchical triple systems and the role played by the Galactic tidal (GT) field. We find that when the timescales of the secular von-Ziepel-Lidov-Kozai and the GT oscillations are comparable, triple evolution becomes chaotic which leads to extreme eccentricities. Consequently, the close pericentre approaches of the inner-binary components lead to strong interactions, mergers and collisions. We use a novel secular evolution code to quantify the key parameters and carry out a population-synthesis study of low and intermediate-mass wide-orbit triples. We find that in $sim9%$ of low-mass wide-triples the inner main-sequence binaries collide or tidally-inspiral within $10 rm Gyr$, with direct collisions are $6$ times more likely to occur. For the intermediate-mass sample, $sim7.6%$ of the systems merge or inspiral with roughly equal probabilities. We discuss the relative fractions of different stellar merger/inspiral outcomes as a function of their evolutionary stage (Main-Sequence, MS; Red-Giant, RG; or White-Dwarf, WD), their transient electromagnetic signatures and the final products of the merger/inspiral. In particular, the rate of WD-WD direct-collisions that lead to type-Ia Supernovae is comparable to other dynamical channels and accounts for at most $0.1%$ of the observed rate. RG inspirals provide a novel channel for the formation of eccentric common-envelope-evolution binaries. The catalysis of mergers/collisions in triples due to GT could explain a significant fraction, or even the vast majority, of blue-stragglers in the field, produce progenitors for cataclysmic-variables, and give-rise to mergers/collisions of double-RG binaries." @default.
- W4226084013 created "2022-05-05" @default.
- W4226084013 creator A5036766874 @default.
- W4226084013 creator A5065198365 @default.
- W4226084013 date "2022-03-14" @default.
- W4226084013 modified "2023-10-03" @default.
- W4226084013 title "Chaotic dynamics of wide triples induced by galactic tides: a novel channel for producing compact binaries, mergers, and collisions" @default.
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