(binary star including a substellar object)
EF Eridani is a binary star in which the smaller
binary companion (EF Eridani B) is a substellar object with
the appearance of a (former) star that lost most of its mass
to its companion. It is a planetary mass object presumably originally created
through the star formation process rather than typical
planet formation.. The larger, EF Eridani A is a white dwarf.
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