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 Laboratory Studies (3227): People
Bernhard  Jost's Picture
Address:
Jet Propulsion Laboratory
M/S 183-601
4800 Oak Grove Drive
Pasadena, CA 91109
Phone:
626-375-0487
Email Contact:

Bernhard Jost

I’m a planetary scientist with a strong background in experimental work with water ice (-mixtures). During my PhD I mainly studied light scattering and evolution processes on ice-dust surfaces in the laboratory in order to understand observations from ESA’s Rosetta mission. A main focus laid on the development of novel facilities to produce icy grains with controlled characteristics such as composition and size in a reproducible manner.

At JPL I study the dehydration kinetics of hydrated sodium minerals under UV irradiation to quantify lifetime predictions on Europa’s surface. This work seeks to elucidate the link between observables on the surface to the habitability of the past and present aqueous environment. A direct application could be an estimation of surface deposition rates from plume ejecta and a comparison with surrounding terrains.


Education
  • D. in Physics, Space Research and Planetology Division, University of Bern, Switzerland (2016), Advisor: Prof. Nicolas Thomas
  • Sc. in Experimental Physics, Space Research and Planetology Division, University of Bern, Switzerland (2012)
  • B.Sc. in Physics/Astronomy, University of Bern/University of Fribourg (2011)

Research Interests
  • Light scattering on icy surfaces
  • Development of novel laboratory techniques to monitor physical and chemical processes on ice bearing samples
  • Evolution of cometary surfaces
  • Chemistry of ices under space weathering processes

Professional Experience
  • Mar 2018 – present, NPP fellow at NASA JPL, Pasadena, CA, United States
  • Jan 2017 – Feb 2018, Software test engineer at Schneider Software AG, Thun, Switzerland (part-time)
  • Oct 2016 – Feb 2018, Postdoctoral researcher at University of Bern, Switzerland (part-time)
  • Feb 2011 – Dec 2017, Teaching assistant, University of Bern, Switzerland

Selected Awards
  • NASA Postdoc Fellowship (2017)

Selected Publications
  1. Galli, A., Vorburger, A., Wurz, P., Pommerol, A., Cerubini, R., Jost, B., Poch, O., Tulej, M., Thomas, N., 0.2 to 10 keV electron interacting with water ice: Radiolysis, sputtering, and sublimation, Planetary and Space Science, in press, doi: 10.1016/j.pss.2017.11.016.
  2. Jost, B., Pommerol, A., Poch, O., Brouet, Y., Fornasier, S., Carrasco, N., Szopa, C., and Thomas, N., Bidirectional reflectance of laboratory cometary analogues to interpret the spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko, Planetary and Space Science 148, 1-11, doi: 10.1016/j.pss.2017.09.009.
  3. Jost, B., Pommerol, A., Poch, O., Yoldi, Z., Fornasier, S., Hasselmann, P.H. , Feller, C. , Carrasco, N. , Szopa, C.,  and Thomas, N. Bidirectional reflectance and VIS-NIR spectroscopy of cometary analogues under simulated space conditions, Planetary and Space Science, 145, 14-27 doi:10.1016/j.pss.2017.07.009.
  4. Poch, O., Pommerol, A., Jost, B., Frey, J., Roditi, I., Thomas, N., Remote sensing of potential biosignatures from rocky, liquid or icy (exo)planetary surfaces, Astrobiology, 17, 231-252.
  5. Feller, C., Fornasier, S., Hasselmann, P.H., Barucci, A., Preusker, F., Scholten, F., Jorda, L., Pommerol, A., Jost, B., Poch, O., ElMaary, M.R., Thomas, N., Belskaya, I., Pajola, M., Sierks, H., and 42 coauthors, Decimetre-scaled observations of the comet 67P/Churyumov - Gerasimenko with the OSIRIS instrument, Monthly Notices of the Royal Astronomical Society 462, S287–S303.
  6. Galli, A., Vorburger, A., Pommerol, A., Wurz, P., Jost, B., Poch, O., Brouet, Y., Tulej, M., Thomas, N., (2016), Surface charging of thick porous water ice layers relevant for ion sputtering experiments, Planetary and Space Science 126, 63-71.
  7. Poch, O., Pommerol, A., Jost, B., Carrasco, N., Szopa, C., Thomas, N., (2016), Sublimation of ice-tholins mixtures: a morphological and spectro-photometric study, Icarus 266, 288-305.
  8. Jost, B., Pommerol, A., Poch, O., Gundlach, B., Leboeuf, M., Dadras, M., Blum, J., Thomas, N., (2016) Experimental characterization of the opposition surge in fine-grained water-ice and high albedo analogs, Icarus 264, 109-131.
  9. Pommerol, A., Thomas, N., El-Maarry, M. R., Pajola, M., Groussin, O., Auger, A.-T., Oklay, N., Fornasier, S., Feller, C., Davidsson, B., Gracia, A.,   Jost, B., Marschall, R., Poch, O., Barucci, M. A., Bertaux, J.-L., La Forgia, F., Keller, H. U. and 36 co-authors, (2015) OSIRIS observations of meter-size exposures of H2O ice at the surface of 67P/Churyumov-Gerasimenko and interpretation using laboratory experiments, Astron. Astrophys. 583, A25, doi:10.1051/0004-6361/201525977
  10. Jost, B., B. Gundlach, A. Pommerol, J. Oesert, S. N. Gorb, J. Blum, and N. Thomas, Micrometer-sized ice particles for planetary-science experiments - II. Bidirectional reflectance, Icarus, 225, p. 352-366, doi: 10.1016/j.icarus.2013.04.007, 2013.

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