A Rotation Rate for the Planetary-mass Companion DH Tau b

  title={A Rotation Rate for the Planetary-mass Companion DH Tau b},
  author={Jerry W. Xuan and Marta L. Bryan and Heather A. Knutson and Brendan P. Bowler and Caroline V. Morley and Bj{\"o}rn Benneke},
  journal={The Astronomical Journal},
DH Tau b is a young planetary-mass companion orbiting at a projected separation of 320 au from its ∼2 Myr old host star DH Tau. With an estimated mass of 8–22 this object straddles the deuterium-burning limit, and might have formed via core or pebble accretion, disk instability, or molecular cloud fragmentation. To shed light on the formation history of DH Tau b, we obtain the first measurement of rotational line broadening for this object using high-resolution (R ∼ 25,000) near-infrared… 
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