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dc.contributor.authorEncrenaz, T.
dc.contributor.authorDeWitt, C.
dc.contributor.authorRichter, M.J.
dc.contributor.authorGreathouse, T.K.
dc.contributor.authorFouchet, T.
dc.contributor.authorMontmessin, F.
dc.contributor.authorLefèvre, F.
dc.contributor.authorBézard, B.
dc.contributor.authorAtreya, S K.
dc.contributor.authorAoki, S.
dc.contributor.authorSagawa, H.
dc.date2018
dc.date.accessioned2018-05-30T11:04:27Z
dc.date.available2018-05-30T11:04:27Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/6950
dc.descriptionThe global D/H ratio on Mars is an important measurement for understanding the past history of water on Mars; locally, through condensation and sublimation processes, it is a possible tracer of the sources and sinks of water vapor on Mars. Measuring D/H as a function of longitude, latitude and season is necessary for determining the present averaged value of D/H on Mars. Following an earlier measurement in April 2014, we used the Echelon Cross Echelle Spectrograph (EXES) instrument on board the Stratospheric Observatory for Infrared Astronomy (SOFIA) facility to map D/H on Mars on two occasions, on March 24, 2016 (Ls = 127°), and January 24, 2017 (Ls = 304°), by measuring simultaneously the abundances of H2O and HDO in the 1383–1391 cm−1 range (7.2 μm). The D/H disk-integrated values are 4.0 (+0.8, −0.6) × Vienna Standard Mean Ocean Water (VSMOW) and 4.5 (+0.7, −0.6) × VSMOW, respectively, in agreement with our earlier result. The main result of this study is that there is no evidence of strong local variations in the D/H ratio nor for seasonal variations in the global D/H ratio between northern summer and southern summer.
dc.languageeng
dc.titleNew measurements of D/H on Mars using EXES aboard SOFIA
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.source.titleAstronomy & Astrophysics
dc.source.volume612
dc.source.pageA112
Orfeo.peerreviewedYes
dc.identifier.doi10.1051/0004-6361/201732367


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