Water on Mars: global maps of H2O, HDO and D/H obtained with CRIRES at VLT and NIRSPEC at Keck II

Details Water on Mars: global maps of H2O, HDO and D/H obtained with CRIRES at VLT and NIRSPEC at Keck II Water on Mars: global maps of H2O, HDO and D/H obtained with CRIRES at VLT and NIRSPEC at Keck II

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p52a..05v&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P52A-05

Biology

[5210] Planetary Sciences: Astrobiology / Planetary Atmospheres, Clouds, And Hazes, [5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

What is the deuterium enrichment of water on Mars? Is it variable? How wet was Mars in the Past? We have addressed these questions by acquiring high spectral resolution data at ground-based telescopes sampling multiple lines of HDO and H2O on Mars. The observations were performed from August/2009 to June/2010 using CRIRES at VLT, NIRSPEC at Keck II and CSHELL at NASA-IRTF, obtaining the highest spatial resolution achievable from Earth using adaptive optics. The measurements span an important range of seasons on Mars (LS = 324 to 360/0 to 110°), and by orienting the instrument’s slit East-West and North-South on the planet we have obtained a global and comprehensive sample of the seasonal and diurnal variations of the D/H on Mars. We will present global maps of D/H for different seasons, and present estimates of the current and ancient reservoirs of water on Mars from these measurements. Acknowledgements: This work was funded by NASA’s R&A Programs in Astrobiology (344-53-51), Planetary Astronomy (344-32-51-96), and Planetary Atmospheres (08-PATM08-0031). We gratefully acknowledge the Director and staff of the European Southern Observatory, the Keck observatory and the NASA-IRTF observatory for supporting these observations.

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