Pre-Common-Envelope Mass Loss from Coalescing Binary Systems

Abstract

Binary systems undergoing unstable Roche Lobe overflow spill gas into their circumbinary environment as their orbits decay toward coalescence. In this paper, we use a suite of hydrodynamic models of coalescing binaries involving an extended donor and a more compact accretor. We focus on the period of unstable Roche Lobe overflow that ends as the accretor plunges within the envelope of the donor at the onset of a common envelope phase. During this stage, mass is removed from the donor and flung into the circumbinary environment. Across a wide range of binary mass ratios, we find that the mass expelled as the separation decreases from the Roche limit to the donor's original radius is of the order of 25% of the accretor's mass. We study the kinematics of this ejecta and its dependencies on binary properties and find that it assembles into a toroidal circumbinary distribution. These circumbinary tori have approximately constant specific angular momentum due to momentum transport by spiral shocks launched from the orbiting binary. We show that an analytic model with these torus properties captures many of the main features of the azimuthally-averaged profiles of our hydrodynamic simulations. Our results, in particular the simple relationship between accretor mass and expelled mass and its spatial distribution, may be useful in interpreting stellar coalescence transients like luminous red novae, and in initializing hydrodynamic simulations of the subsequent common envelope phase.

arXiv commentThe Astrophysical Journal, Volume 895, Issue 1, id.29. Software to reproduce these results availible at: https://github.com/morganemacleod/PreCEMassLoss, software to model pre-CE unstable mass transfer and circumbinary material based on simulation results availible at: https://github.com/morganemacleod/RLOF

References in corpus (51)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• Common Envelope Evolution: Where we stand and how we can move forward
• V1309 Scorpii: merger of a contact binary
• An AMR Study of the Common Envelope Phase of Binary Evolution
• Simulating the Common Envelope Phase of a Red Giant Using SPH and Uniform Grid Codes
• Main-sequence stellar eruption model for V838 Mon
• The Interaction of Stellar Objects within a Common Envelope
• Identification of the Long-Sought Common-Envelope Events
• Hydrodynamic moving-mesh simulations of the common envelope phase in binary stellar systems
• Cool and Luminous Transients from Mass-Losing Binary Stars
• V1309 SCO - Understanding a merger
• Binary Stellar Mergers with Marginally-Bound Ejecta: Excretion Disks, Inflated Envelopes, Outflows, and their Luminous Transients
• Luminous Red Novae: Stellar Mergers or Giant Eruptions?
• Accretion in common envelope evolution
• Common Envelope ejection for a Luminous Red Nova in M101
• Shock-powered light curves of luminous red novae as signatures of pre-dynamical mass loss in stellar mergers
• The effect of a wider initial separation on common envelope binary interaction simulations
• Recombination energy in double white dwarf formation
• Lessons from the Onset of a Common Envelope Episode: the Remarkable M31 2015 Luminous Red Nova Outburst
• Pre-explosion spiral mass loss of a binary star merger
• Common envelope events with low-mass giants: understanding the transition to the slow spiral-in
• On the role of recombination in common-envelope ejections
• Common envelope events with low-mass giants: understanding the energy budget
• Violent Stellar Merger Model for Transient Events
• Close stellar binary systems by grazing envelope evolution
• Runaway Coalescence at the Onset of Common Envelope Episodes
• Bound Outflows, Unbound Ejecta, and the Shaping of Bipolar Remnants during Stellar Coalescence
• Efficient common-envelope ejection through dust-driven winds
• Burying a Binary: Dynamical Mass Loss and a Continuous Optically-Thick Outflow Explain the Candidate Stellar Merger V1309 Scorpii
• Magnetic Field Amplification During the Common Envelope Phase
• Speaking with one voice: simulations and observations discuss the common envelope $\alpha$ parameter
• The SPIRITS sample of Luminous Infrared Transients: Uncovering Hidden Supernovae and Dusty Stellar Outbursts in Nearby Galaxies
• Luminous Red Novae: population models and future prospects
• A Luminous Red Nova in M31 and its Progenitor System
• Accretion Disk Assembly During Common Envelope Evolution: Implications for Feedback and LIGO Binary Black Hole Formation
• Considerations on the Role of Fall-Back Discs in the Final Stages of the Common Envelope Binary Interaction
• Common envelope: enthalpy consideration
• Common Envelope Evolution on a Moving Mesh
• Simulating a binary system that experiences the grazing envelope evolution
• Simulating the Onset of Grazing Envelope Evolution of Binary Stars
• Operation of the jet feedback mechanism (JFM) in intermediate luminosity optical transients (ILOTs)
• The January 2015 outburst of a red nova in M31
• Intermediate luminosity optical transients during the grazing envelope evolution (GEE)
• Properties of the post in-spiral common envelope ejecta I: dynamical and thermal evolution
• How Drag Force Evolves in Global Common Envelope Simulations
• Energizing the last phase of common envelope removal
• Common envelope light-curves - I. grid-code module calibration
• Super-luminous X-ray Emission from the Interaction of Supernova Ejecta with Dense Circumstellar Shells
• Polygram Stars: Resonant Tidal Excitation of Fundamental Oscillation Modes in Asynchronous Stellar Coalescence

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