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Interstellar medium is the space between the stars. The interstellar medium is composed of gas (predominantly hydrogen and helium) and dust. Such interstellar matter makes up approximately 15% of the visible matter in our galaxy.
Multiple stars are thought to form either through disk fragmentation or turbulent fragmentation, but the latter has had no clear observational confirmation. Here the authors report misaligned disks around a wide-binary pair, a sign of turbulent fragmentation.
A previously unidentified class of variable stars has been found in OGLE survey data, characterized by periodic brightness variations on ~30-min timescales, amplitudes of ~0.3 mag and temperatures of ~30,000 K. They are potentially evolved low-mass stars.
Combining studies of star formation rates with studies of cloud–magnetic field alignment has revealed that magnetic fields are a primary regulator of star formation. Perpendicular alignment inhibits star formation, whereas parallel alignment facilitates it.
Disk winds from the surfaces of protoplanetary disks remove angular momentum from radii outside ~10 au. Lee et al. show that residual angular momentum is removed at radii <10 au via highly collimated jets launched at the 0.05 au scale, enabling accretion.
Using Si18O as a velocity tracer, evidence is reported for a rotating outflow driven by a magneto-centrifugal disk wind launched by a high-mass young stellar object. This rotation is a signature of the removal of angular momentum by an outflow.