#  ITC Colloquium - Andrea Antoni (Berkeley 

 



####  calendar\_today Date and Time 

 **April 13, 2023** 

 11:00AM - 12:00PM EDT 

####  pin\_drop Location 

 **Phillips**  



 

 



 

 **Random angular momentum in convection: delayed explosions of red supergiants following “failed” supernovae**

 Red supergiants (RSGs) are the most common stars that will undergo iron core collapse. Successful explosions of RSGs following core collapse lead to the most common supernovae, Type IIp. However, a fraction of core-collapse events may not lead to an immediate supernova explosion of the RSG. In those cases, a large fraction of the hydrogen envelope will fall in towards the newly-formed black hole. The angular momentum content of the infalling material determines whether accretion power can be liberated into driving an outflow or powering a luminous transient. I will show that, even in non-rotating RSGs, the random velocity field in the convective envelope carries significant angular momentum in each shell. Using 3D hydrodynamical simulations, I will show that infall of the convective envelope generates an energetic outflow. This drives nearly complete envelope ejection in an explosion with an energy of at least 10^48 ergs and with outflow speeds of hundreds of km/s./ The light curve of such an event would exhibit a characteristic, red plateau with a luminosity of at least ~few x 10^40 ergs and a duration of several hundreds of days. These events would appear quite similar to luminous red novae with red or yellow supergiant progenitors.



 

 



 

 See also:- [ 2022-23 ](/academic-year/2022-23)
- [ Colloquium ](/event-type/colloquium)
 
 

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