Why do some newly formed stars form protoplanetary discs while others do not?

The Sun contains more than 98% of the material in the solar system. During star formation, the majority of the material from the gas and dust cloud it formed from is consumed.

If enough heavier elements and compounds remain in an orbit to allow them to clump together to form rocky planets, a protoplanetary disc will form if the material left orbiting the new star is able to do so.

In order to exist in solid form, lighter elements and compounds like water, methane, and ammonia must be far enough from the star to form clumps that eventually form gas and ice giant planets.

Therefore, a protoplanetary disc cannot form if the material left orbiting a new star is insufficiently rich in heavier elements and compounds, or is devoid of volatile compounds that are sufficiently far from the star to be solid.

The conservation of angular momentum in the collapsing cloud of gas and dust causes some newly formed stars to form protoplanetary discs; if a star forms from a rotating cloud, the material flattens into a disc around the star; otherwise, the angular momentum may be redistributed in other ways during formation, depending on the star's formation process, magnetic fields, turbulence, and interactions with nearby stars or outflows from the forming star.