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In this study, we independently test the presence of an exoplanet around thebinary KIC 9472174, which is composed of a red dwarf and a pulsating type Bsubdwarf. We also present the results of our search for Jupiter-mass objectsorbiting near to the eclipsing binary KIC 7975824, which is composed of a whitedwarf and type B subdwarf, and the pulsating white dwarf KIC 8626021. The goalis to test analytical techniques and prepare the ground for a larger search forpossible substellar survivors on tight orbits around post-common envelopebinaries and stars at the end of their evolution, that is, extended horizontalbranch stars and white dwarfs. We, therefore, mainly focus on substellar bodiesorbiting these stars within the range of the host's former red-giant orasymptotic-giant phase envelopes. Due to the methods we use, the quest isrestricted to single-pulsating type B subdwarf and white dwarf stars andshort-period eclipsing binaries containing a white dwarf or a subdwarfcomponent.  Results. Based on the three objects studied in this paper, we demonstratethat these methods can be used to detect giant exoplanets orbiting aroundpulsating white dwarf or type B subdwarf stars as well as short-period binarysystems, at distances which fall within the range of the former red-giantenvelope of a single star or the common envelope of a binary. Using ouranalysis techniques, we reject the existence of a Jupiter-mass exoplanet aroundthe binary KIC 9472174 at the distance and orbital period previously suggestedin the literature. We also found that the eclipse timing variations observed inthe binary might depend on the reduction and processing of the Kepler data. Theother two objects analyzed in this work do not have Jupiter mass exoplanetsorbiting within 0.7 - 1.4 AU from them, or larger-mass objects on closer orbits(the given mass limits are minimum masses).

The quest for planets around subdwarfs and white dwarfs from Kepler space telescope fields: Part I. Techniques and tests of the methods