▁this ▁type ▁with ▁or ▁without ▁observed ▁plan ets ▁( ex op lan ets ) ▁showed ▁that ▁the ▁known ▁planet - b ear ing ▁stars ▁have ▁less ▁than ▁one ▁per ▁cent ▁of ▁the ▁prim ord ial ▁Li ▁abund ance , ▁and ▁of ▁the ▁remainder ▁half ▁had ▁ten ▁times ▁as ▁much ▁Li . ▁It ▁is ▁hypoth es ised ▁that ▁the ▁presence ▁of ▁plan ets ▁may ▁increase ▁the ▁amount ▁of ▁mixing ▁and ▁deep en ▁the ▁con ve ct ive ▁zone ▁to ▁such ▁an ▁extent ▁that ▁the ▁Li ▁can ▁be ▁burn ed . ▁A ▁possible ▁mechanism ▁for ▁this ▁is ▁the ▁idea ▁that ▁the ▁plan ets ▁affect ▁the ▁angular ▁momentum ▁evolution ▁of ▁the ▁star , ▁thus ▁changing ▁the ▁rotation ▁of ▁the ▁star ▁relative ▁to ▁similar ▁stars ▁without ▁plan ets ; ▁in ▁the ▁case ▁of ▁the ▁Sun ▁slow ing ▁its ▁rotation . ▁More ▁research ▁is ▁needed ▁to ▁discover ▁where ▁and ▁when ▁the ▁fault ▁in ▁the ▁mod elling ▁lies . ▁Given ▁the ▁precision ▁of ▁hel io se ism ic ▁prob es ▁of ▁the ▁interior ▁of ▁the ▁modern - day ▁Sun , ▁it ▁is ▁likely ▁that ▁the ▁mod elling ▁of ▁the ▁proto stell ar ▁Sun ▁needs ▁to ▁be ▁adjust ed . ▁ ▁See ▁also ▁▁ ▁Pro to star ▁ ▁References ▁ ▁External ▁links ▁ ▁Description ▁of ▁the ▁SS M ▁ ▁by ▁David ▁Gu ent her ▁ ▁Sol ar ▁Mod els : ▁An ▁Historical ▁Over view ▁by ▁John ▁N . ▁Bah call ▁ ▁Category : A st ro physics ▁Category : Con cept ual ▁models ▁Category : S un ▁Category : St