Anders, FriedrichPadois, ChloéDrapkin Junyent, Sara2025-07-232025-07-232025-01https://hdl.handle.net/2445/222510Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2025, Tutors: Friedrich Anders, Chloé PadoisIn this work we analyze the elemental abundances of a selected main-sequence stars data set from the GALAH DR4 survey by means of a dimensionality reduction technique (UMAP) and a clustering method (Agglomerative Clustering with Ward linkage). This will allow us, with some future work, to define robust and interpretable chemical-abundance groups that are more finegrained than the usual thin vs. thick disk dichotomy. Using the subsample of known exoplanet host stars within the GALAH DR4 sample, we explore possible trends of planet occurrence rate with the abundance group, finding little statistical evidence.6 p.application/pdfengcc-by-nc-nd (c) Drapkin, 2025http://creativecommons.org/licenses/by-nc-nd/3.0/es/Planetes extrasolarsSeqüència principalTreballs de fi de grauExtrasolar planetsMain sequenceBachelor's thesesinfo:eu-repo/semantics/bachelorThesisinfo:eu-repo/semantics/openAccess