Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9

@article{Gauza2015DiscoveryOA,
  title={Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9},
  author={Bartosz Gauza and V'ictor J. S. B'ejar and Antonio P'erez-Garrido and Mar{\'i}a Rosa Zapatero Osorio and Nicolas Lodieu and Rafael Rebolo and Enric Pall'e and Grzegorz Nowak},
  journal={arXiv: Earth and Planetary Astrophysics},
  year={2015}
}
In a search for common proper motion companions using the VISTA Hemisphere Survey and 2MASS catalogs we have identified a very red (J-Ks=2.47 mag) late-L dwarf companion of a previously unrecognized M dwarf VHS J125601.92-125723.9, located at a projected angular separation of 8.06"+/-0.03". From low-resolution optical and near-IR spectroscopy we classified the primary and the companion as an M7.5+/-0.5 and L7+/-1.5, respectively. The primary shows weaker alkali lines than field dwarfs of… 
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TLDR
It is suggested that lithium becomes weaker at lower gravity like all other alkali lines and thus needs to be carefully considered before being used as a diagnostic of age or mass for objects in this regime.
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