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Paper: Widest Separation and the Lowest Mass Objects among Planetary-mass Companion Candidates around Young Stars
Volume: 482, 10th Pacific Rim Conference on Stellar Astrophysics
Page: 59
Authors: Oh, D.
Abstract: Two substellar companion candidates with planetary mass, around a T-Tauri star in the ρ Ophiuchi star-forming region, are discovered by results of near-infrared imaging. Candidates are separated by 1454AU, candi 1 for short, and 542AU, candi 2 for short. There are high possibilities that both candidates are physically related to its primary star from their common proper motions, colors and statistics of YSOs in star forming region. candi 2 is identified as an extremely low-mass object, 0.0070.002 , and this is the lowest mass among planetary-mass companion(PMC) candidates imaged to date. In addition, separation from its primary star of candi 1, 0.014 ± 0.002 , is the widest among PMC candidates imaged to date. Formation of these extremely wide separated, > 100AU, PMCs, like candi 1 and c, is not fully explained by current planet formation theories, core accretion or gravitational instability. This discovery may suggest that PMCs separated by > 100AU form via extreme mass ratio case of cloud core fragmentation for multiple stars. Apologies : Because of our team policy, we cannot present the name and details of this target currently.
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