Planetas aislados /
They have received a lot of names: free-floating planets, isolated planetary mass objects, "sub-brown dwarfs", cluster planets... but none of them has reached to be used as a standard. However, everybody knows what we are talking about: objects with masses below the deuterium-burning limit (about 13 Jupiter masses for solar metallicity), found in young open clusters and at distances large enough to be gravitationally unbound to any star of the cluster.
In the list below, we give the name of the object, the optical I and near infrared J magnitudes, the spectral type (from optical spectra) and the mass of the object, inferred from the best fit to theoretical isochrones. Colon (:) in the mass column means that the given value must be understood only as an estimation of the real mass.
|Name||I (mag)||J (mag)||Spectral type||Mass (MJup)|
|S Ori 70||25.0||20.3||T6:||3+5-1|
|S Ori 69||23.9||20.2||T0:||6:|
|S Ori 68||23.8||20.2||L5.0||6:|
|S Ori 67||23.4||19.9||L5.0||7:|
|S Ori 66||23.2||19.8||L3.5||7:|
|S Ori 65||23.2||19.8||L3.5||7:|
|S Ori 64||23.1||19.5||-||8:|
|S Ori 62||23.0||19.4||L2.0||8+2-3|
|S Ori 60||22.8||19.2||L2.0||8+2-3|
|S Ori 58||21.9||18.6||L0.0||11+4-4|
|S Ori 56||21.7||18.4||L0.5-L1.0||11+4-4|
|S Ori 55||21.3||18.2||M9||12+4-4|