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TY - JOUR AU - Lagrange, A.-M. AU - Meunier, Nadège AU - Rubini, Pascal AU - Keppler, Miriam AU - Galland, Franck AU - Chapellier, Eric AU - Michel, Eric AU - Balona, Luis AU - Beust, Hervé AU - Guillot, Tristan AU - Grandjean, Antoine AU - Borgniet, Simon AU - Mékarnia, Djamel AU - Wilson, Paul Anthony AU - Kiefer, Flavien AU - Bonnefoy, Mickael AU - Lillo-Box, Jorge AU - Pantoja, Blake AU - Jones, Matias AU - Iglesias, Daniela Paz AU - Rodet, Laetitia AU - Diaz, Matias AU - Zapata, Abner AU - Abe, Lyu AU - Schmider, François-Xavier PY - 2019 DA - 2019/12/01 TI - Evidence for an additional planet in the β Pictoris system JO - Nature Astronomy SP - 1135 EP - 1142 VL - 3 IS - 12 AB - With its imaged debris disk of dust, its evaporating exocomets, and an imaged giant planet, the young (~23 Myr) β Pictoris system is a unique proxy for detailed studies of planet formation processes as well as planet–disk interactions. Here, we study ten years of European Southern Observatory/High Accuracy Radial Velocity Planet Searcher (HARPS) high-resolution spectroscopic data of β Pictoris. After removing the radial velocity (RV) signals arising from the δ Scuti pulsations of the star, a ~1,200-d periodic signal remains, which, within our current knowledge, we can only attribute to a second planet in the system. The β Pic c mass is about nine times the mass of Jupiter; it orbits at ~2.7 au on an eccentric (e ~ 0.24) orbit. More RV data are needed to obtain more precise estimates of the properties of β Pic c. The current modelling of the planet’s properties and the dynamic of the whole system has to be reinvestigated in light of this detection. SN - 2397-3366 UR - https://doi.org/10.1038/s41550-019-0857-1 DO - 10.1038/s41550-019-0857-1 ID - Lagrange2019 ER -