There is no evidence of a stellar companion to Zeta Geminorum.

It is not known to have a stellar companion.

Instead, in 2007, a close stellar companion was likely discovered.

Ankaa has a small stellar companion, about which little is known.

Also, a grazing eclipse by a stellar companion can mimic a transit.

This is not a binary star system in the sense of having a gravitationally-bound stellar companion.

The wiggles may result from the gravitational influence of one or more stellar companions to the new star, astronomers said.

Timing analysis have revealed the possible presence of a third low-mass stellar companion in wide orbit.

The secondary may itself have an orbiting stellar companion of spectral class F8:.

However the proportion of single star systems increases for smaller stars, so that only 25% of red dwarfs are known to have stellar companions.