No escaping helium from 55 Cnc e.

  title={No escaping helium from 55 Cnc e.},
  author={M. Zhang and H. Knutson and Li-le Wang and F. Dai and A. Oklop{\vc}i{\'c} and R. Hu},
  journal={arXiv: Earth and Planetary Astrophysics},
We search for escaping helium from the hot super Earth 55 Cnc e by taking high-resolution spectra of the 1083 nm line during two transits using Keck/NIRSPEC. We detect no helium absorption down to a 90% upper limit of 250 ppm in excess absorption or 0.27 milli-Angstrom in equivalent width. This corresponds to a mass loss rate of less than $\sim10^9$ g/s, although the precise constraint is heavily dependent on model assumptions. This rate is notably below that predicted by both the 1D… Expand


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