Hörst Group Members
Postdocs and Research Scientists


Graduate Students

Michael Radke (4th Year)

Michael is a fourth year graduate student with a background in Geology and Chemistry. He is interested in the chemistry of planetary atmospheres--particularly those of Venus and Titan. He is also interested in the complex chemical interactions between planetary surfaces and atmospheres and how these atmospheres evolve over geologic timescales. He enjoys drinking coffee, looking at rocks, skiing, and contemplating his existence in the Solar System.



  • Sarah Moran (4th Year)

    Sarah is a fourth year graduate student with an Astrophysics background. She's interested in the atmospheric dynamics and chemistry of the outer Solar System planets as well as exoplanets. She also has a strong interest in science policy, related to both this and other worlds. Sarah is also a NASA Earth and Space Sciences Fellow (NESSF).


  • *Moran, S.E., Hörst, S.M., Batalha, N.E., Lewis, N.K., and H.R. Wakeford. "Limits on Clouds and Hazes on the TRAPPIST-1 Planets." Astronomical Journal, 156, 6, 252, doi:10.3847/1538-3881/aae83a.




  • Kristin Showalter Sotzen (4th Year)

    Kristin is a fourth year graduate student with a background in applied physics and space systems engineering. She is interested in atmospheric dynamics and chemistry for both exoplanets and solar system planets. She is also interested in planetary formation and orbital dynamics. She is currently engaged in research with the Space Telescope Science Institute looking at spectroscopy of hot Jupiter atmospheres.


    Joseph Serigano (5th Year)

    Joe is a fifth year graduate student interested in the atmospheres of the outer solar system. He is currently using data from the Cassini Ion and Neutral Mass Spectrometer to understand the composition and structure of Saturn's atmosphere.





    Undergraduate Students

    Ashley Walker (Senior, Chicago State University)


    Major: Chemistry
    Interests: Astrochemistry, planet formation, and Titan.
    Ashley is a chemistry major at Chicago State University. She's interested in astrochemistry, planet formation, and Titan. She plays sports such as basketball and flag football, she loves animals, and she's also interested in social justice and increasing minorities in STEM.




    Former Group Members

    Xinting Yu (余馨婷) (Graduate Student, 2014-2019)

    PhD Earth and Planetary Sciences 2019
    Xinting is now a 51 Pegasi b Fellow at the University of California Santa Cruz.
    Xinting's Website


  • *Yu, X., Hörst, S.M., *He, C., Crawford, B., and P. McGuiggan. "Where does Titan sand come from: Insights from mechanical properties of Titan sand candidates." JGR-Planets, doi:10.1029/2018JE005651, 2018.


    Yu, X.*, Hörst, S.M.., He, C.*, McGuiggan, P., and N.T. Bridges. "Direct Measurement of Interparticle Forces of Titan Aerosol Analogs (Tholin) Using Atomic Force Microscopy." JGR Planets, 122, doi: 10.1002/2017JE005437, 2017.

    Yu, X*, Hörst, S.M., He, C.*, Bridges, N.T., Burr, D.M., Sebree, J.A., and Smith, J.K. "The Effect of Adsorbed Liquid and Material Density on Saltation Threshold: Insight from Laboratory and Wind Tunnel Experiments." Icarus, 297, 97-109, doi:10.1016/j.icarus.2017.06.034, 2017.


    Bryné Hadnott (Graduate Student, 2017-2019)

    MA in Earth and Planetary Sciences 2019

    Sydney Riemer (Undergraduate, 2015-2017)

    BA in Earth and Planetary Sciences 2018
    Sydney is pursuing a master's in Geological and Environmental Science at Ben-Gurion University in Israel. She will be studying benthic organisms and how they affect sediment geochemistry.


    Mira Sobhy (Undergraduate, 2016-2017)

    BA in Earth and Planetary Sciences 2018
    Mira will be doing an internship at NASA JPL during Summer 2018, working on the Mars Sample Return architecture. Then she will be moving to New Zealand, as the 2018 Meg Walsh Award recipient where she will run a project that works on revitalization of indigenous Māori astronomy.




    Last Updated: 15 July 2019

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