High-resolution Transit Spectroscopy of Warm Saturns

  • Deibert E
  • de Mooij E
  • Jayawardhana R
  • et al.
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Abstract

We present high-resolution optical transmission spectroscopy of two sub-Saturn mass transiting exoplanets, HAT-P-12b and WASP-69b. With relatively low densities and high atmospheric scale heights, these planets are particularly well-suited to characterization through transit spectroscopy, and serve as ideal candidates for extending previously tested methods to lower planetary masses. Using a single transit for each planet, we take advantage of the Doppler cross-correlation technique to search for sodium, potassium, and water absorption features. Our analysis reveals a likely (3.2 σ ) detection of sodium absorption features in the atmosphere of HAT-P-12b, and enables us to place constraints on the presence of alkaline and molecular species in the atmospheres of both planets. With our results, we highlight the efficacy of ground-based campaigns for characterizing exoplanetary atmospheres and pave the way for future analyses of low-mass planets.

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Deibert, E. K., de Mooij, E. J. W., Jayawardhana, R., Fortney, J. J., Brogi, M., Rustamkulov, Z., & Tamura, M. (2019). High-resolution Transit Spectroscopy of Warm Saturns. The Astronomical Journal, 157(2), 58. https://doi.org/10.3847/1538-3881/aaf56b

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