In the last eight years, astronomers have detected more than 100 stars and observed even more circumstellar disks where planets may be forming.

In the intermediate width case, the ejecta from the explosion may be interacting strongly with gas around the star - the circumstellar medium.

Circumstellar envelope is the part of the star having roughly spherical shape and not gravitationally bound to the star core.

The 'e' notation indicates the spectrum displays emission lines, which means this is a Be star that is surrounded by hot, circumstellar gas.

Recent submillimeter observations confirm the presence of an outer flat, circumstellar disk of debris with an outer radius of 150 A.U.

The circumstellar environment of G29-38 first attracted attention in the late 1980s during a near-infrared survey of 200 white dwarfs conducted by Ben Zuckerman and Eric Becklin to search for low mass companion stars and brown dwarfs.