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On rapid binary mass transfer -- I. Physical model

Lu, Wenbin and Fuller, Jim and Quataert, Eliot and Bonnerot, Clément (2022) On rapid binary mass transfer -- I. Physical model. . (Unpublished)

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In some semi-detached binary systems, the donor star may transfer mass to the companion at a very high rate. We propose that, at sufficiently high mass transfer rates such that the accretion disk around the companion becomes geometrically thick (or advection-dominated) near the disk outer radius, a large fraction of the transferred mass will be lost through the outer Lagrangian (L2) point. A physical model is constructed where the L2 mass loss fraction is given by the requirement that the remaining material in the disk has Bernoulli number equal to the L2 potential energy. Our model predicts significant L2 mass loss at mass transfer rates exceeding a few times 10^{-4} Msun/yr -- an equatorial circum-binary outflow (CBO) is formed in these systems. Implications for the orbital evolution and the observational appearance are discussed. In particular, (1) rapid angular momentum loss from the system tends to shrink the orbital separation and hence may increase the formation rate of mergers and gravitational-wave sources; (2) photons from the hot disk wind are reprocessed by the CBO into longer wavelength emission in the infrared bands, consistent with Spitzer observations of some ultra-luminous X-ray sources.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Lu, Wenbin0000-0002-1568-7461
Fuller, Jim0000-0002-4544-0750
Quataert, Eliot0000-0001-9185-5044
Bonnerot, Clément0000-0001-9970-2843
Additional Information:We thank Nadia Zakamska, Jim Stone, Alexey Bobrick and Pablo Marchant for useful conversations. WL was supported by the David and Ellen Lee Fellowship at California Institute of Technology and the Lyman Spitzer, Jr. Fellowship at Princeton University. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 836751. DATA AVAILABILITY. The data underlying this article will be shared on reasonable request to the corresponding author.
Group:Astronomy Department, TAPIR
Funding AgencyGrant Number
David and Ellen Lee Postdoctoral ScholarshipUNSPECIFIED
Princeton UniversityUNSPECIFIED
Marie Curie Fellowship836751
Subject Keywords:binary evolution ; gravitational waves ; supernovae ; compact objects ; neutron star mergers
Record Number:CaltechAUTHORS:20220526-173255266
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114940
Deposited By: George Porter
Deposited On:31 May 2022 15:29
Last Modified:02 Jun 2023 01:25

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