The Dynamical Roche Lobe in Hierarchical Triples. (arXiv:1903.11618v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Stefano_R/0/1/0/all/0/1">Rosanne Di Stefano</a>
The Roche lobe formalism describes mass transfer from one star to another. We
develop an extension to hierarchical triples, considering the case in which a
star donates mass to a companion which is itself a binary. The L1 point moves
as the inner binary rotates, and the Roche lobe pulsates with the period of the
inner binary. Signatures of mass transfer may therefore be imprinted with the
orbital period of the inner binary. For some system parameters, the pulsing
Roche lobe can drive mass transfer at high rates. Systems undergoing this type
of mass transfer include those with inner binaries consisting of compact
objects that will eventually merge, as well as progenitors of Type Ia
supernovae.
The Roche lobe formalism describes mass transfer from one star to another. We
develop an extension to hierarchical triples, considering the case in which a
star donates mass to a companion which is itself a binary. The L1 point moves
as the inner binary rotates, and the Roche lobe pulsates with the period of the
inner binary. Signatures of mass transfer may therefore be imprinted with the
orbital period of the inner binary. For some system parameters, the pulsing
Roche lobe can drive mass transfer at high rates. Systems undergoing this type
of mass transfer include those with inner binaries consisting of compact
objects that will eventually merge, as well as progenitors of Type Ia
supernovae.
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