# Unique Spectroscopy and Imaging of Mars with JWST

Geronimo L. Villanueva, Francesca Altieri, Todd R. Clancy, Therese Encrenaz, Thierry Fouchet, Paul Hartogh, Emmanuel Lellouch, Miguel A. Lopez-Valverde, Michael J. Mumma, Robert E. Novak, Michael D. Smith, Ann-Carine Vandaele, Michael J. Wolff, Pierre Ferruit and Stefanie N. Milam
October, 2015
Abstract:

In this document, we summarize the main capabilities of the James Webb Space Telescope (JWST) for performing observations of Mars. The distinctive vantage point of JWST at the Sun-Earth Lagrange point (L2) will allow sampling the full observable disk, permitting the study of short-term phenomena, diurnal processes (across the East-West axis) and latitudinal processes between the hemispheres (including seasonal effects) with excellent spatial resolutions (0.07 arcsec at 2 {\mu}m). Spectroscopic observations will be achievable in the 0.7-5 {\mu}m spectral region with NIRSpec at a maximum resolving power of 2700, and with 8000 in the 1-1.25 {\mu}m range. Imaging will be attainable with NIRCam at 4.3 {\mu}m and with two narrow filters near 2 {\mu}m, while the nightside will be accessible with several filters in the 0.5 to 2 {\mu}m. Such a powerful suite of instruments will be a major asset for the exploration and characterization of Mars. Some science cases include the mapping of the water D/H ratio, investigations of the Martian mesosphere via the characterization of the non-LTE CO$_2$ emission at 4.3 {\mu}m, studies of chemical transport via observations of the O$_2$ nightglow at 1.27 {\mu}m, high cadence mapping of the variability dust and water ice clouds, and sensitive searches for trace species and hydrated features on the Martian surface. In-flight characterization of the instruments may allow for additional science opportunities.

Publications of the Astronomical Society of the Pacific. arXiv:1510.04619
http://arxiv.org/ftp/arxiv/papers/1510/1510.04619.pdf
Type:
Article