▁by ▁which ▁the ▁angular ▁momentum ▁of ▁the ▁contract ing ▁Sun ▁was ▁transferred ▁to ▁the ▁pro top lan et ary ▁disc ▁and ▁hence , ▁eventually ▁to ▁the ▁plan ets . ▁ ▁Anal ogs ▁of ▁T ▁Ta uri ▁stars ▁in ▁the ▁higher ▁mass ▁range ▁( 2 – 8 ▁solar ▁masses ) — A ▁and ▁B ▁spectral ▁type ▁pre – main - sequence ▁stars , ▁are ▁called ▁Her big ▁A e / Be - type ▁stars . ▁More ▁massive ▁( > 8 ▁solar ▁masses ) ▁stars ▁in ▁pre – main ▁sequence ▁stage ▁are ▁not ▁observed , ▁because ▁they ▁evol ve ▁very ▁quickly : ▁when ▁they ▁become ▁visible ▁( i . e . ▁dispers es ▁surrounding ▁circum stell ar ▁gas ▁and ▁dust ▁cloud ), ▁the ▁hydro gen ▁in ▁the ▁center ▁is ▁already ▁burning ▁and ▁they ▁are ▁main ▁sequence ▁objects . ▁ ▁Plan ets ▁Plan ets ▁around ▁T ▁Ta uri ▁stars ▁include : ▁ ▁HD ▁ 1 0 6 9 0 6 ▁b ▁around ▁an ▁F - type ▁star ▁ 1 R X S ▁J 1 6 0 9 2 9 . 1 − 2 1 0 5 2 4 ▁around ▁a ▁K - type ▁star ▁Gli ese ▁ 6 7 4 ▁b ▁around ▁an ▁M - type ▁star ▁V 8 3 0 ▁T au ▁b ▁around ▁an ▁M - type ▁star ▁P DS ▁ 7 0 b ▁around ▁a ▁K - type ▁star ▁ ▁Can ▁M ature ▁Star ▁Systems ▁with ▁" hot ▁Jup iter " ▁Plan ets ▁Act ▁Like ▁T ▁Ta uri ▁Systems ? ▁In ▁ 2