COol Companions ON Ultrawide orbiTS (COCONUTS). I. A High-Gravity T4 Benchmark around an Old White Dwarf and A Re-Examination of the Surface-Gravity Dependence of the L/T Transition.

@article{Zhang2020COolCO,
  title={COol Companions ON Ultrawide orbiTS (COCONUTS). I. A High-Gravity T4 Benchmark around an Old White Dwarf and A Re-Examination of the Surface-Gravity Dependence of the L/T Transition.},
  author={Z. Zhang and M. Liu and J. Hermes and E. Magnier and M. Marley and P. Tremblay and M. Tucker and A. Do and A. Payne and B. Shappee},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2020}
}
  • Z. Zhang, M. Liu, +7 authors B. Shappee
  • Published 2020
  • Physics
  • arXiv: Solar and Stellar Astrophysics
  • We present the first discovery from the COol Companions ON Ultrawide orbiTS (COCONUTS) program, a large-scale survey for wide-orbit planetary and substellar companions. We have discovered a co-moving system COCONUTS-1, composed of a hydrogen-dominated white dwarf (PSO J058.9855+45.4184; $d=31.5$ pc) and a T4 companion (PSO J058.9869+45.4296) at a $40.6''$ (1280 au) projected separation. We derive physical properties for COCONUTS-1B from (1) its near-infrared spectrum using cloudless Sonora… CONTINUE READING

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