that is a good question

[kookaburra]

i thought because carth runs off because you bastilla and carth were a threesome until you turn to the dark side....i thought because carth ran off i thought he might be hiding some where on the planet....after you get a few things on the un known planet try looking for him on the un known planet....keep looking and if you are lucky you might find him......after all for a while bastilla carth nd you share a sought of special bond....so does the others but darth malak wanted the three of you