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We report the discovery of two transiting planets orbiting K2-290 (EPIC249624646), a bright (V=11.11) late F-type star residing in a triple-starsystem. It was observed during Campaign 15 of the K2 mission, and in order toconfirm and characterise the system, follow-up spectroscopy and AO imaging werecarried out using the FIES, HARPS, HARPS-N, and IRCS instruments. From AOimaging and Gaia data we identify two M-dwarf companions at a separation of$113 \pm 2$ AU and $2467_{-155}^{+177}$ AU. From radial velocities, K2photometry, and stellar characterisation of the host star, we find the innerplanet to be a mini-Neptune with a radius of $3.06 \pm 0.16 R_{\oplus}$ and anorbital period of $P = 9.2$ days. The radius of the mini-Neptune suggests thatthe planet is located above the radius valley, and with an incident flux of$F\sim 400 F_{\oplus}$, it lies safely outside the super-Earth desert. Theouter warm Jupiter has a mass of $0.774\pm 0.047 M_{\rm J}$ and a radius of$1.006\pm 0.050R_{\rm J}$, and orbits the host star every 48.4 days on an orbitwith an eccentricity $e<0.241$. Its mild eccentricity and mini-Neptune siblingsuggest that the warm Jupiter originates from in situ formation or diskmigration.

K2-290: a warm Jupiter and a mini-Neptune in a triple-star system