Does the “STELLAR” IMF Extend to Planetary Masses?

摘要: Despite the claims made by Burgasser et al. (2004) that SOri70, coolest candidate member known in any open cluster, is a foreground brown dwarf, I argue this object still remains strong for being genuine cluster planet. SOri70 has different spectral energy distribution and colors than field T dwarfs of similar type (T5-T7). In J-H versus H-K diagram, lies region where models ultracool predict low gravity objects should be located. The existence planetary-mass candidates down to about 3 Jupiter masses (detection limit current surveys) Sigma Orionis suggests formation giant planets may not very from stars.