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A new measurement of D/H on Mars using EXES aboard SOFIA

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Abstract

The distribution of D/H ratio on Mars is crucial for understanding the planet’s water cycle including the exchange with surface reservoirs, and for estimating the amount of liquid water in the past. We have employed EXES (Echelle Cross Echelle Spectrograph) aboard SOFIA (Stratospheric Observatory For Infrared Astronomy) to map D/H on Mars in the thermal infrared, starting with the first measurement in April 2014 (Ls = 113°). Here we present a new measurement obtained in March 2016 (Ls = 127°). The disk-integrated value of D/H is found be 4.0 (+0.7, -0.6) x VSMOW, in agreement with our earlier result (4.4 (+1.0, -0.6) x VSMOW) [3]
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Dates and versions

hal-03803290 , version 1 (29-11-2022)
hal-03803290 , version 2 (29-11-2022)

Identifiers

  • HAL Id : hal-03803290 , version 2

Cite

Thérèse Encrenaz, Curtis N. Dewitt, Matthew J. Richter, Thomas K. Greathouse, Thierry Fouchet, et al.. A new measurement of D/H on Mars using EXES aboard SOFIA. European Planetary Science Congress 2017, Sep 2017, Riga, Latvia. pp.EPSC2017-168. ⟨hal-03803290v2⟩
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