A new measurement of D/H on Mars using EXES aboard SOFIA
Résumé
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]
Domaines
Astrophysique [astro-ph]| Origine | Fichiers produits par l'(les) auteur(s) |
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