Propane on Titan

  title={Propane on Titan},
  author={Henry G. Roe and Thomas K. Greathouse and Matthew J. Richter and John Henry Lacy},
  journal={The Astrophysical Journal Letters},
  pages={L65 - L68}
We present the first observations of propane (C3H8) on Titan that unambiguously resolve propane features from other numerous stratospheric emissions. This is accomplished using a R = λ/δλ ≈ 105 spectrometer (the Texas Echelon Cross Echelle Spectrograph) to observe propane's ν26 rotation-vibration band near 748 cm-1. We find a best-fit fractional abundance of propane in Titan's stratosphere of (6.2 ± 1.2) × 10-7 in the altitude range to which we are sensitive (90-250 km or 13-0.24 mbar). 

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