I JWST Image Reveals Processes Ejecting Material in Star Formation

[anorlunda]

Thanks to the JWST, we have this stunning picture. The APOD description says

the hourglass-shaped nebula's cavities are created as material ejected in the star-forming process plows through the surrounding medium.

What are the processes that eject material at this stage?

 

[berkeman]

The APOD description says

 

[Astronuc]

L1527 lies some 460 light-years distant (from Earth), while CARMA-7, the protostar is one of dozens of similar objects in the Serpens South star cluster, which is located approximately 1,400 light-years from Earth.

Some information on protostars and matter ejection.

https://public.nrao.edu/news/protostar-serpens-alma/

All stars form in dense clouds of dust and gas. As material condenses and a star begins to evolve, surrounding material forms a flattened, rotating disk that flows onto its surface. Because of the rotational energy of the material in the disk and with the help of the star’s magnetic field, a portion of that material gets ejected from the star’s poles, forming a pair of jets that can be seen with radio telescopes like ALMA.

Some electrodynamic force, e.g., E on a fluctuating B, perhaps thermal effects (hot gas expanding) and perhaps some radiation pressure.

https://public.nrao.edu/news/jets-massive-protostars-different/

A team of scientists observed a massive protostar called Cep A HW2, located about 2,300 light-years from Earth in the constellation Cepheus. Cep A HW2 is expected to develop into a new star about 10 times more massive than the Sun. The new VLA images showed the finest detail yet seen in such an object, giving the astronomers their first view of the innermost portion of the jet, a portion roughly as long as the diameter of the Solar System.

Ejection of gaseous clumps from gravitationally unstable protostellar disks
https://www.aanda.org/articles/aa/full_html/2016/06/aa28102-16/aa28102-16.html