Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Grazing envelope evolution toward Type IIb supernovae   I propose a scenario where the majority of the progenitors of type IIb
supernovae (SNe IIb) lose most of their hydrogen-rich envelope during a grazing
envelope evolution (GEE). In the GEE the orbital radius of the binary system is
about equal to the radius of the giant star, and the more compact companion
accretes mass through an accretion disk. The accretion disk is assumed to
launch two opposite jets that efficiently remove gas from the envelope along
the orbit of the companion. The efficient envelope removal by jets prevents the
binary system from entering a common envelope evolution, at least for part of
the time. The GEE might be continuous or intermittent. I crudely estimate the
total GEE time period to be in the range of about hundreds of years, for a
continuous GEE, and up to few tens of thousands of years for intermittent GEE.
The key new point is that the removal of envelope gas by jets during the GEE
prevents the system from entering a common envelope evolution, and by that
substantially increases the volume of the stellar binary parameter space that
leads to SNe IIb, both to lower secondary masses and to closer orbital
separations.

3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ