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  • 标题:New measurements of D/H on Mars using EXES aboard SOFIA
  • 本地全文:下载
  • 作者:T. Encrenaz ; C. DeWitt ; M. J. Richter
  • 期刊名称:Astronomy & Astrophysics
  • 印刷版ISSN:0004-6361
  • 电子版ISSN:1432-0746
  • 出版年度:2018
  • 卷号:612
  • DOI:10.1051/0004-6361/201732367
  • 语种:English
  • 出版社:EDP Sciences
  • 摘要:The 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−1range (7.2μm). 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.
  • 关键词:Key wordsenplanets and satellites: atmospheresplanets and satellites: individual: Mars
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