Due in part of discoveries of
planetary companions around this Sun - like star, 47 Ursae Majoris became one of the top 100 target stars for NASA's proposed Terrestrial Planet Finder (TPF), which is now indefinitely delayed.
A planetary companion around the foreground star can produce a variation in the brightening of the background star.
Not exact matches
That causes our
planetary companion to pop out from the synestia, leaving it in orbit
around the body that will keep cooling until it resembles Earth.
However, the inner, eccentric orbit of a giant
planetary companion «b» recently discovered
around 54 Piscium would probably disturb the orbit of such an Earth - type planet.
Assuming that the spectroscopic
companion B does not preclude a stable inner
planetary orbit, the distance from Star A where an Earth - type planet would be «comfortable» with liquid water is centered
around only 0.457 AU — between the orbital distances of Mercury and Venus in the Solar System.
On the other hand, the discovery of a brown dwarf
companion in a wide orbit that could perturb dormant comets in an Oort Cloud
around Epsilon Indi inwards towards the star's inner
planetary regions may periodically shower an Earth - type, inner planet with catastrophic impacts.
However, if the existence of a relatively close, second
companion (see Star Bc below)
around Bab — with an orbital period of 2.2 to 2.9 years or less — is confirmed, then a
planetary orbit in Star Ba's water zone may not be stable over the long run.
However, the giant
planetary companion «A1» or «b» recently discovered
around Star A could disturb the stability or the development of such a rocky planet in this orbit.