Remote sensing of planetary properties and biosignatures on extrasolar terrestrial planets

David J. Des Marais, Martin O. Harwit, Kenneth W. Jucks, James Kasting, Douglas N.C. Lin, Jonathan I. Lunine, Jean Schneider, Sara Seager, Wesley A. Traub, Neville J. Woolf

Research output: Contribution to journalArticle

321 Citations (Scopus)

Abstract

The major goals of NASA's Terrestrial Planet Finder (TPF) and the European Space Agency's Darwin missions are to detect terrestrial-sized extrasolar planets directly and to seek spectroscopic evidence of habitable conditions and life. Here we recommend wavelength ranges and spectral features for these missions. We assess known spectroscopic molecular band features of Earth, Venus, and Mars in the context of putative extrasolar analogs. The preferred wavelength ranges are 7-25 μm in the mid-IR and 0.5 to ~1.1 μm in the visible to near-IR. Detection of O2 or its photolytic product O 3 merits highest priority. Liquid H2O is not a bioindicator, but it is considered essential to life. Substantial CO2 indicates an atmosphere and oxidation state typical of a terrestrial planet. Abundant CH4 might require a biological source, yet abundant CH 4 also can arise from a crust and upper mantle more reduced than that of Earth. The range of characteristics of extrasolar rocky planets might far exceed that of the Solar System. Planetary size and mass are very important indicators of habitability and can be estimated in the mid-IR and potentially also in the visible to near-IR. Additional spectroscopic features merit study, for example, features created by other biosignature compounds in the atmosphere or on the surface and features due to Rayleigh scattering. In summary, we find that both the mid-IR and the visible to near-IR wavelength ranges offer valuable information regarding biosignatures and planetary properties; therefore both merit serious scientific consideration for TPF and Darwin.

Original languageEnglish (US)
Pages (from-to)153-181
Number of pages29
JournalAstrobiology
Volume2
Issue number2
DOIs
StatePublished - Jun 1 2002

Fingerprint

Planets
terrestrial planets
extrasolar planets
remote sensing
wavelengths
planet
wavelength
Atmosphere
habitability
atmospheres
Venus
United States National Aeronautics and Space Administration
Venus (planet)
Rayleigh scattering
Mars
European Space Agency
solar system
oxidation
mars
atmosphere

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Des Marais, D. J., Harwit, M. O., Jucks, K. W., Kasting, J., Lin, D. N. C., Lunine, J. I., ... Woolf, N. J. (2002). Remote sensing of planetary properties and biosignatures on extrasolar terrestrial planets. Astrobiology, 2(2), 153-181. https://doi.org/10.1089/15311070260192246
Des Marais, David J. ; Harwit, Martin O. ; Jucks, Kenneth W. ; Kasting, James ; Lin, Douglas N.C. ; Lunine, Jonathan I. ; Schneider, Jean ; Seager, Sara ; Traub, Wesley A. ; Woolf, Neville J. / Remote sensing of planetary properties and biosignatures on extrasolar terrestrial planets. In: Astrobiology. 2002 ; Vol. 2, No. 2. pp. 153-181.
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Des Marais, DJ, Harwit, MO, Jucks, KW, Kasting, J, Lin, DNC, Lunine, JI, Schneider, J, Seager, S, Traub, WA & Woolf, NJ 2002, 'Remote sensing of planetary properties and biosignatures on extrasolar terrestrial planets', Astrobiology, vol. 2, no. 2, pp. 153-181. https://doi.org/10.1089/15311070260192246

Remote sensing of planetary properties and biosignatures on extrasolar terrestrial planets. / Des Marais, David J.; Harwit, Martin O.; Jucks, Kenneth W.; Kasting, James; Lin, Douglas N.C.; Lunine, Jonathan I.; Schneider, Jean; Seager, Sara; Traub, Wesley A.; Woolf, Neville J.

In: Astrobiology, Vol. 2, No. 2, 01.06.2002, p. 153-181.

Research output: Contribution to journalArticle

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AU - Harwit, Martin O.

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AU - Kasting, James

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AU - Lunine, Jonathan I.

AU - Schneider, Jean

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AU - Woolf, Neville J.

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