Kavli Affiliate: Dimitri Mawet| Summary:We present the second set of discoveries from Keck Observations in the INfrared of Taurus and $ρ$ Oph Exoplanets And Ultracool dwarfs (KOINTREAU), an adaptive optics survey of young stars in the Taurus and $ρ$ Oph star-forming regions using Keck/NIRC2 in conjunction with the Keck infrared pyramid wavefront sensor. We have discovered two faint comoving companions to young stars ISO-Oph 96 and 2MASS J16262785-2625152. The companion to ISO-Oph 96, KOINTREAU-3b, is at a projected separation of 340 au (2.49"). Using our NIRC2 photometry and evolutionary models, and assuming that the companion has the same extinction as its host star, we infer that KOINTREAU-3b has a mass of $3.4pm0.7$ M$_rm Jup$. The companion to 2MASS J16262785-2625152, KOINTREAU-4b, has a projected separation of 180 au (1.25") and could have a mass of either $11.5^+1.2_-1.6$ M$_rm Jup$ or $15.3^+0.7_-0.8$ M$_rm Jup$, depending on whether the host star is a member of $ρ$ Oph or Upper Sco.| Search Query:arXiv Query: search_query=au:”mawet dimitri”&id_list=&start=0&max_results=10Read More