Points de petite hauteur sur une vari\'et\'e semi-ab\'elienne de la forme $\mathbb{G}_m^n \times A$

Recently, R\'emond stated a very general conjecture on lower bounds of a normalized height on either an abelian variety or a power of the multiplicative group. In this note, we extend a particular case of this conjecture to split semi-abelian varieties of the form $\mathbb{G}_m^n \times A$. This allows us to connect many results already existing in the litterature. Finally, we give new examples for which this conjecture holds.Comment: Final version. in French language. Published in Bull. Lond. Math. Soc. NB: this version is slightly different from the one published http://doi.org/10.1112/blms.1269