( ( Like ( ( ( ( ( the ( other ( two exoplanets ) ) ) , ) ( ( ( ( HD 40307 ) b ) and ) ( ( HD 40307 ) d ) ) ) , ) ( orbiting ( the ( star ( HD 40307 ) ) ) ) ) ) ( , ( ( ( HD 40307 ) ( c ( was ( discovered ( by ( ( measuring variations ) ( in ( ( the ( radial velocity ) ) ( of ( HD 40307 ) ) ) ) ) ) ) ) ) ) ( ( ( caused ( by ( ( the ( star 's ) ) orbit ) ) ) ( around ( ( the center ) ( of ( mass ( of ( the ( planetary system ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Like) (S (NP (NP (DT the) (JJ other) (CD two) (NNS exoplanets)) (, ,) (NP (NP (NP (QP (CD HD) (CD 40307))) (NP (SYM b))) (CC and) (NP (NP (QP (CD HD) (CD 40307))) (NP (SYM d)))) (, ,)) (VP (VBG orbiting) (NP (DT the) (NN star) (QP (CD HD) (CD 40307)))))) (, ,) (NP (NP (NNP HD) (CD 40307)) (SBAR (S (NP (SYM c)) (VP (VBD was) (VP (VBN discovered) (PP (IN by) (S (VP (VBG measuring) (NP (NNS variations)) (PP (IN in) (NP (NP (DT the) (JJ radial) (NN velocity)) (PP (IN of) (NP (NNP HD) (CD 40307))))))))))))) (VP (VBD caused) (PP (IN by) (NP (NP (DT the) (NN star) (POS 's)) (NN orbit))) (PP (IN around) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (NP (NN mass)) (PP (IN of) (NP (DT the) (JJ planetary) (NN system)))))))) (. .)))
Like the other two exoplanets, HD 40307 b and HD 40307 d, orbiting the star HD 40307, HD 40307 c was discovered by measuring variations in the radial velocity of HD 40307 caused by the star's orbit around the center of mass of the planetary system.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN exoplanet)) (VP (VBZ is) (ADVP (RB often)) (VP (VBN discovered) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ causes) (NP (DT a) (NN star) (S (VP (VP (TO to) (VP (VB move))) (CC or) (VP (TO to) (VP (VB dim))))))))))) (. .)))