Giada Nicole Arney

Giada Nicole Arney

  • Research AST, Planetary Studies
  • 301.614.6627
  • NASA/GSFC
  • Mail Code: 693
  • Greenbelt , MD 20771
  • Employer: NASA
  • Brief Bio

    I am a research space scientist at NASA Goddard. I focus on exoplanets, hazes, Venus, and astrobiology. I recieved a dual-title PhD in astronomy and astrobiology from the University of Washington.

    Research Interests

    Research Interests

    My research has involved modeling and measuring properties of planets with an emphasis on worlds enshrouded by global cloud and haze layers because aerosols appear to be a common planetary phenomeon. I have a dual focus on both solar system bodies and on exoplanets. I have retrieved properties of Venus’ sub-cloud atmosphere through observations of its nightside spectral windows, producing the first simultaneous and temporally resolved maps of cloud opacity, acid concentration, water vapor (H2O), hydrogen chloride (HCl), carbon dioxide (CO), carbonyl sulfide (OCS), and sulfur dioxide (SO2). I also have extensive modeling experience of planetary atmospheres and have comprehensively simulated hazy Archean Earth with a coupled photochemical-climate model to study its atmospheric composition, climate, and habitability. Using a sophisticated radiative transfer model together with a coronagraph noise model and a JWST model, I showed that organic haze on an Earthlike planet produces strong spectral signatures that may be detectable with future telescopes. In addition, I helped lead a paper on Proxima Centauri b’s possible climatic and environmental states and their spectral discriminants, and I have been involved in work identifying oxygen false positive biosignature signals. My current and near-future research focuses on modeling the atmospheric and climatic states of exoplanets, understanding the observational requirements to discriminate between different planetary states with current and future observatories, and re-visiting Venus with new observations.

    Current Projects

    New Observations of Venus

    I recently led new observations out of Apache Point Observatory of the Venusian nightside. We will measure abundances of gases, look for spatial and temporal variability, and use these observations to test a new exoplanet retrieval codes.

    Organic Haze and Biology on Exoplanets

    I am interested in understanding organic haze in the context of the planetary biosphere. Organic haze is produced from methane photochemistry, and the putative organic haze that may have intermittently enshrouded Earth during the Archean would have been produced from biogenic methane. Such hazes may serve as a type of planetary biosignature, but methods of distinguishing biogenic organic hazes (such as on Archean Earth) from abiotic organic hazes (such as on Titan) are needed to properly interpret hazy exoplanet spectra. I have been thinking about different kinds of planetary contextual information we may be able to from exoplanet spectra to make these determinations. In addition, I am thinking about how the haze may have in turn impacted the planet's biosphere: it would have altered the amount of radiation reaching the surface available to photosynthetic life, and it would have also cut down on the amount of damaging UV.

    LUVOIR coronagraph simulator

    I am involved with developing and updating an online coronagraph noise simulator for LUVOIR. This tool can be accessed from this page: https://asd.gsfc.nasa.gov/luvoir/tools/

    Professional Service

    I have taken on numerous leadership and community service roles and consider them integral components of my scientific career. I have recently become deputy lead for the Early Earth Task of the Virtual Planetary Laboratory – an international research team spanning multiple institutions – and I will become the lead for this Task in the VPL re-proposal effort for CAN8. I also lead the Venus Exploration Analysis Group (VEXAG)’s early career scholars focus group, and I am currently co-leading an effort to re-design the VEXAG website. Presently, I am serving on the SOC for the Comparative Climatology of Terrestrial Planets III Conference. I am also serving on the LUVOIR study office science support analysis team and the LUVOIR exoplanets working group. I am the deputy lead of the LUVOIR science support analysis team.

    Awards

    Fellowships:
    • NASA Postdoctoral Program Fellowship (2016)
    • NSF Integrative Graduate Education and Research Traineeship (2010)

    Honors and Awards:
    • Postdoctoral Associate on winning Habitable Worlds proposal (June 2016)
    • Co-I on winning NAI Director’s Discretionary Fund proposal (Feb. 2016)
    • Student Travel Award to attend Earth Life Science Institute International Symposium (Jan. 2016)
    • Scholarship attendee of Australian Centre for Astrobiology “Grand Tour” (July 2015)
    • Co-lead on UW Student Technology Fee funded proposal “Revitalizing the UW Planetarium” (Jan. 2015)
    • NASA Astrobiology Institute Early Career Collaboration Award (2014)
    • Seattle Astronomical Society Outreach Award (Sept. 2013)
    • Santander Astrobiology Summer School (June 2012)
    • Phi Beta Kappa (2008)
    • University of Colorado Wesley Scholarship (2007)
     

    Publications

    Refereed

    Arney, G. N., V. S. Meadows, S. D. Domagal-Goldman, et al. D. Deming, T. D. Robinson, G. Tovar, E. T. Wolf, and E. Schwieterman. 2017. "Pale Orange Dots: The Impact of Organic Haze on the Habitability and Detectability of Earthlike Exoplanets." The Astrophysical Journal, 836 (1): 49 [10.3847/1538-4357/836/1/49]

    Krissansen-Totton, J., E. W. Schwieterman, B. Charnay, et al. G. Arney, T. D. Robinson, V. Meadows, and D. C. Catling. 2016. "IS THE PALE BLUE DOT UNIQUE? OPTIMIZED PHOTOMETRIC BANDS FOR IDENTIFYING EARTH-LIKE EXOPLANETS." The Astrophysical Journal, 817 (1): 31 [10.3847/0004-637x/817/1/31]

    Schwieterman, E. W., V. S. Meadows, S. D. Domagal-Goldman, et al. D. Deming, G. N. Arney, R. Luger, C. E. Harman, A. Misra, and R. Barnes. 2016. "IDENTIFYING PLANETARY BIOSIGNATURE IMPOSTORS: SPECTRAL FEATURES OF CO AND O 4 RESULTING FROM ABIOTIC O 2 /O 3 PRODUCTION." The Astrophysical Journal, 819 (1): L13 [10.3847/2041-8205/819/1/l13]

    Arney, G., S. D. Domagal-Goldman, V. S. Meadows, et al. E. T. Wolf, E. Schwieterman, B. Charnay, M. Claire, E. Hébrard, and M. G. Trainer. 2016. "The Pale Orange Dot: The Spectrum and Habitability of Hazy Archean Earth." Astrobiology, 16 (11): 873-899 [10.1089/ast.2015.1422]

    Charnay, B., V. Meadows, A. Misra, J. Leconte, and G. Arney. 2015. "3D MODELING OF GJ1214b's ATMOSPHERE: FORMATION OF INHOMOGENEOUS HIGH CLOUDS AND OBSERVATIONAL IMPLICATIONS." The Astrophysical Journal, 813 (1): L1 [10.1088/2041-8205/813/1/l1]

    Arney, G., V. Meadows, D. Crisp, et al. S. J. Schmidt, J. Bailey, and T. Robinson. 2014. "Spatially resolved measurements of H2O, HCl, CO, OCS, SO2, cloud opacity, and acid concentration in the Venus near-infrared spectral windows." Journal of Geophysical Research: Planets, 119 (8): 1860-1891 [10.1002/2014je004662]

    Talks, Presentations and Posters

    Invited

    The Habitability and Characterizaton of Enshrouded Worlds

    5 / 2017

    NASA Goddard Solar System Exoploration Seminar.

    Pulling Back the Veil: The Characterization and Habitability of Enshrouded Worlds.

    4 / 2017

    Space Telescope Science Institute Exoplanet Seminar.

    Pulling Back the Veil: What Can LUVOIR Teach Us About Enshrouded Earths?

    3 / 2017

    LUVOIR Seminar. NASA Goddard Space Flight Center, Greenbelt, MD.

    Pale Orange Dots

    3 / 2017

    Carnegie Institution Department of Terrestrial Magnetism. Washington, D. C.

    Pulling Back the Veil: Characterizing Enshrouded Worlds

    7 / 2016

    Stars and Planets Seminar. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA.

    The Pale Orange Dot: The Spectrum and Climate of Hazy Archean Earth

    11 / 2015

    Solar System Exploration Fall Seminar Series. NASA Goddard Space Flight Center, Greenbelt, MD.

    Ground Based Measurements of Trace Gases Below the Cloud Deck

    10 / 2015

    13th Meeting of the Venus Exploration Analysis Group Meeting. Washington, D.C.

    Other

    Organic Haze as a Biosignature in the Presence of Biogenic Sulfur Gases.

    4 / 2017

    AbSciCon, Mesa, AZ. April 2017. Oral Presentation.

    Pale Orange Dots: Earthlike Worlds with Organic Hazes

    2 / 2016

    The Astrophysics of Planetary Habitability Conference, Vienna, Austria. February 2016. Oral presentation.
     

    Under an Orange Sky: The Many Implications of Organic Haze for Earthlike Planets

    11 / 2015

    DPS, National Harbor, MD. Oral presentation

    Under an Orange Sky: The Many Implications of an Archean Haze.

    9 / 2015

    Comparative Climates of Terrestrial Planets II. Mountain View, CA. Oral presentation.
     

    The Pale Orange Dot: Spectra and Climates of Hazy Archean Earthlike Worlds

    6 / 2015

    AbSciCon, Chicago, IL, Oral Presentation.
     

    The Pale Orange Dot: The Climactic and Spectral Effects of Haze in Archaen Earth's Atmospher

    5 / 2015

    Emerging Researchers in Exoplanet Science Symposium, State College, PA, Oral Presentation.

    Hazy Archean Earth as an Analog for Hazy Earthlike Exoplanets

    1 / 2015

     225th AAS Meeting, Seattle, WA, Oral presentation.
     

    Spatially-Resolved Measurements of H2O, HCl, CO, OCS, SO2 and cloud opacity in the Venus Near-Infrared Windows

    10 / 2013

    DPS, Denver, CO, Oral presentation.
     

    Brief Bio

    I am a research space scientist at NASA Goddard. I focus on exoplanets, hazes, Venus, and astrobiology. I recieved a dual-title PhD in astronomy and astrobiology from the University of Washington.

    Publications

    Refereed

    Arney, G. N., V. S. Meadows, S. D. Domagal-Goldman, et al. D. Deming, T. D. Robinson, G. Tovar, E. T. Wolf, and E. Schwieterman. 2017. "Pale Orange Dots: The Impact of Organic Haze on the Habitability and Detectability of Earthlike Exoplanets." The Astrophysical Journal 836 (1): 49 [10.3847/1538-4357/836/1/49]

    Krissansen-Totton, J., E. W. Schwieterman, B. Charnay, et al. G. Arney, T. D. Robinson, V. Meadows, and D. C. Catling. 2016. "IS THE PALE BLUE DOT UNIQUE? OPTIMIZED PHOTOMETRIC BANDS FOR IDENTIFYING EARTH-LIKE EXOPLANETS." The Astrophysical Journal 817 (1): 31 [10.3847/0004-637x/817/1/31]

    Schwieterman, E. W., V. S. Meadows, S. D. Domagal-Goldman, et al. D. Deming, G. N. Arney, R. Luger, C. E. Harman, A. Misra, and R. Barnes. 2016. "IDENTIFYING PLANETARY BIOSIGNATURE IMPOSTORS: SPECTRAL FEATURES OF CO AND O 4 RESULTING FROM ABIOTIC O 2 /O 3 PRODUCTION." The Astrophysical Journal 819 (1): L13 [10.3847/2041-8205/819/1/l13]

    Arney, G., S. D. Domagal-Goldman, V. S. Meadows, et al. E. T. Wolf, E. Schwieterman, B. Charnay, M. Claire, E. Hébrard, and M. G. Trainer. 2016. "The Pale Orange Dot: The Spectrum and Habitability of Hazy Archean Earth." Astrobiology 16 (11): 873-899 [10.1089/ast.2015.1422]

    Charnay, B., V. Meadows, A. Misra, J. Leconte, and G. Arney. 2015. "3D MODELING OF GJ1214b's ATMOSPHERE: FORMATION OF INHOMOGENEOUS HIGH CLOUDS AND OBSERVATIONAL IMPLICATIONS." The Astrophysical Journal 813 (1): L1 [10.1088/2041-8205/813/1/l1]

    Arney, G., V. Meadows, D. Crisp, et al. S. J. Schmidt, J. Bailey, and T. Robinson. 2014. "Spatially resolved measurements of H2O, HCl, CO, OCS, SO2, cloud opacity, and acid concentration in the Venus near-infrared spectral windows." Journal of Geophysical Research: Planets 119 (8): 1860-1891 [10.1002/2014je004662]

                                                                                                                                                                                            
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