Since planets cool rapidly as they age, GPI is most sensitive to young, hot planets at
large orbital distances.
The few confirmed transiting planets at
large orbital distances generally only have two observed transits, rather than the standard three transits needed to confirm, and only one of those (KOI - 351 h) is close to Jupiter - sized.
However, owing to the relatively
large orbital distances of the currently known NIR stars around Sgr ~ A *, there have been no dynamical measurements of its spin magnitude or orientation.
Not exact matches
That means their gravitational force extends over a
large range of
orbital distances, making it much harder to grow a planet like Earth and to keep it stable.
Planet «c» or «2» - A residual drift in the radial velocity data over several years suggest the presence of an even
larger planet in an outer orbit, at about 3.73 AUs from 47 UMa (between the average
orbital distances of Jupiter and the Main Asteroid Belt in the Solar System).
Jon Lomberg, Gemini Observatory
Larger chart image 15 Sge b's observed separation from its host star is currently 1.5 times greater than Saturn's
orbital distance in the Solar System.
The range of orientations that lead to transits falls off as
orbital distances grow: Small changes in the angle of the planet's orbit become
large changes in the apparent position of the planet and star, precluding a transit.
At
larger planetary
orbital distances, the coronagraph is better able to remove the starlight from the area around the planet.