A chamber for studying planetary environments and its applications to astrobiology

We have built a versatile environmental simulation chamber capable of reproducing atmospheric compositions and surface temperatures for most of the planetary objects. It has been especially developed to make feasible in situ irradiation and characterization of the sample under study. The total pressure in the chamber can range from 5 to 5 × 10−9 mbar. The required atmospheric composition is regulated via a residual gas analyser with ca ppm precision. Temperatures can be set from 4 K to 325 K. The sample under study can be irradiated with ion and electron sources, a deuterium ultraviolet (UV) lamp and a noble-gas discharge UV lamp. One of the main technological challenges of this device is to provide the user the possibility of performing ion and electron irradiation at a total pressure of 0.5 mbar. This is attained by means of an efficient differential pumping system. The in situ analysis techniques implemented are UV spectroscopy and infrared spectroscopy (IR). This machine is especially suitable for following the chemical changes induced in a particular sample by irradiation in a controlled environment. Therefore, it can be used in different disciplines such as planetary geology, astrobiology, environmental chemistry, materials science and for instrumentation testing.

[1]  Tobias Owen,et al.  The composition and early history of the atmosphere of Mars , 1992 .

[2]  Spencer,et al.  Temperatures on europa from galileo photopolarimeter-radiometer: nighttime thermal anomalies , 1999, Science.

[3]  D. W. Clarke,et al.  The Design and Use of a Photochemical Flow Reactor: A Laboratory Study of the Atmospheric Chemistry of Cyanoacetylene on Titan , 2000 .

[4]  C. McKay,et al.  The Search for Life on Mars , 2010 .

[5]  J. Pollack,et al.  Dynamics of the atmosphere of Mars , 1992 .

[6]  G. Horneck.  The microbial world and the case for Mars , 2000 .

[7]  S. McKeever,et al.  Investigation of biological, chemical and physical processes on and in planetary surfaces by laboratory simulation , 2002 .

[8]  C. Chyba,et al.  Possible ecosystems and the search for life on Europa. , 2001, Proceedings of the National Academy of Sciences of the United States of America.

[9]  H. Eicken,et al.  The search for life on Europa: limiting environmental factors, potential habitats, and Earth analogues. , 2003, Astrobiology.

[10]  J. Zarnecki,et al.  Annual solar UV exposure and biological effective dose rates on the Martian surface. , 2004, Advances in space research : the official journal of the Committee on Space Research.

[11]  Henry B. Garrett,et al.  Energetic Ion and Electron Irradiation of the Icy Galilean Satellites , 2001 .

[12]  H. Fraser,et al.  SURFRESIDE: a novel experiment to study surface chemistry under interstellar and protostellar conditions , 2004 .

[13]  C. Cockell,et al.  The ultraviolet environment of Mars: biological implications past, present, and future. , 2000, Icarus.

[14]  John H. E. Clark.  Dynamics of the Atmosphere , 2004 .

[15]  R. Baragiola.  Water ice on outer solar system surfaces: Basic properties and radiation effects , 2003 .

[16]  P. D. Feldman,et al.  Detection of an oxygen atmosphere on Jupiter's moon Europa , 1995, Nature.