Title: New perspectives on the common envelope evolution
Abstract: Common envelope evolution (CEE) is believed to be an important stage in the evolution of binary and multiple stellar systems. Observations suggest that following the CEE stage, the CE is ejected and leaving behind a compact binary (or a merger product). However, detailed hydro-dynamical models of CEE encounter major difficulties. They show that following the dynamical inspiral most of the envelope is not ejected; though it expands to larger separations, it remains bound to the binary. In addition, the final separations tend to be larger than expected from observations. In this talk, we will introduce our new perspectives on the CE that can shed more light on this phase.
We will first talk about the possible outcomes of the CEE in binary and triple systems as indicated by our hydrodynamical simulations. We will discuss the role of the orbital eccentricity at the onset of the binary CE, and present the different scenarios of CE in triple stellar systems (TCE) which we expect to play a key role in producing various types of stellar-mergers, unique compact binary systems, and potentially induce transient electromagnetic and gravitational-wave sources.
If time permits, we will discuss our suggested solution to the mass ejection problem, by claiming that dust-driven winds can be produced following the CEE. We show that the inspiral phase in CE-binaries can effectively replace the role of stellar pulsation and drive the CE expansion to scales comparable with those of AGB stars and give rise to efficient mass-loss through dust-driven winds.
──────────
Emanuele Sobacchi is inviting you to a scheduled Zoom meeting.
Join Zoom Meeting
https://huji.zoom.us/j/85086338594?pwd=byt0bjVxRXZDWjh3UExxMkJZcTlRdz09
Meeting ID: 850 8633 8594
Passcode: 895807
One tap mobile
+97223764510,,85086338594#,,,,*895807# Israel
+97239786688,,85086338594#,,,,*895807# Israel
Dial by your location
+972 2 376 4510 Israel
+972 3 978 6688 Israel
+972 2 376 4509 Israel
Meeting ID: 850 8633 8594
Passcode: 895807
Find your local number: https://huji.zoom.us/u/kckZW63t77
Join by Skype for Business
https://huji.zoom.us/skype/85086338594
──────────