Abstract
I argue that the high percentage of planetary nebulae (PNe) that are shaped by jets show that main sequence stars in binary systems can accrete mass at a high rate from an accretion disk and launch jets. Not only does this allow jets to shape PNe, but this also points to the importance of jets in other types of binary systems and in other processes. These processes include the grazing envelope evolution (GEE), the common envelope evolution (CEE), and the efficient conversion of kinetic energy to radiation in outflows. Additionally, the jets point to the possibility that many systems launch jets as they enter the CEE, possibly through a GEE phase. The other binary systems in which jets might play significant roles include intermediate-luminosity optical transients (ILOTs), supernova impostors (including pre-explosion outbursts), post-CEE binary systems, post-GEE binary systems, and progenitors of neutron star binary systems and black hole binary systems. One of the immediate consequences is that the outflow of these systems is highly-non-spherical, including bipolar lobes, jets, and rings.
Highlights
The early recognition that jets play major roles in shaping planetary nebulae (PNe; e.g., [1,2,3]) has received great attention and support in recent years (e.g., [4,5,6,7,8,9,10,11])
Mostly mass transfer, must supply the angular momentum in evolved stars. Observations and their interpretations indicate that most PNe with axisymmetrical and/or point-symmetrical morphological features are born in binary systems (e.g., [15,16,17,18,19,20,21,22,23])
Jones [29] concludes in his review that both post-common envelope evolution (CEE) PNe and merging stars strongly suggest that appreciable mass transfer/loss occurs before the onset of the CEE
Summary
The early recognition that jets play major roles in shaping planetary nebulae (PNe; e.g., [1,2,3]) has received great attention and support in recent years (e.g., [4,5,6,7,8,9,10,11]). The binary system might launch jets before and/or after the common envelope evolution (CEE; e.g., [12]). There is less mass available for accretion onto the object that launches the jets, reducing the jets’ power. As jets are likely to remove energy and high entropy gas, they allow more gas to flow-in, and that way increase the mass accretion rate (e.g., [25]). I concentrate on the role of jets and use some properties of PNe and post-AGB binary systems to learn about the importance and outcome of the grazing envelope evolution (GEE). In the GEE (suggested in 2015 [30]), the jets that the secondary star launches manage to eject the envelope outside its orbit (for numerical simulations see, e.g., [31,32,33]). The GEE phase has several effects and outcomes which I list as follows
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
