An HST/STIS Optical Transmission Spectrum of Warm Neptune GJ 436b

@article{Lothringer2018AnHO,
  title={An HST/STIS Optical Transmission Spectrum of Warm Neptune GJ 436b},
  author={Joshua D. Lothringer and Bj{\"o}rn Benneke and Ian J. M. Crossfield and Gregory W. Henry and Caroline V. Morley and Diana Dragomir and Travis S. Barman and Heather A. Knutson and Eliza M.-R. Kempton and Jonathan J. Fortney and Peter R. McCullough and Andrew W. Howard},
  journal={The Astronomical Journal},
  year={2018},
  volume={155}
}
GJ 436b is a prime target for understanding warm Neptune exoplanet atmospheres and a target for multiple James Webb Space Telescope (JWST) Guaranteed Time Observation programs. Here, we report the first space-based optical transmission spectrum of the planet using two Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) transit observations from 0.53 to 1.03 μm. We find no evidence for alkali absorption features, nor evidence of a scattering slope longward of 0.53 μm. The… 

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