In this work we have revisited a method to directly search the signature of a known non-transiting extrasolar planet in the IR spectrum of a star-planet system. We present preliminary results on the planetary system HD 217107 observed with Phoenix spectrograph in 2007, and also present an optimized strategy to maximize our future success considering the best conditions and best candidates to observe after performing simulations to predict sensitivity limits of the method. With positive results this method could add new information of nontransiting exoplanets and validate the high resolution models of their atmospheres.
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