CHARACTERIZING THE PURPLE EARTH: MODELING THE GLOBALLY INTEGRATED SPECTRAL VARIABILITY OF THE ARCHEAN EARTH

@article{Sanrom2013CHARACTERIZINGTP,
  title={CHARACTERIZING THE PURPLE EARTH: MODELING THE GLOBALLY INTEGRATED SPECTRAL VARIABILITY OF THE ARCHEAN EARTH},
  author={E. Sanrom{\'a} and Enric Pall'e and M. N. Parenteau and Nancy Y. Kiang and A. M. Guti'errez-Navarro and R. J. Garc'ia L'opez and P. Montan'es-Rodr'iguez},
  journal={The Astrophysical Journal},
  year={2013},
  volume={780}
}
Ongoing searches for exoplanetary systems have revealed a wealth of planets with diverse physical properties. Planets even smaller than the Earth have already been detected and the efforts of future missions are aimed at the discovery, and perhaps characterization, of small rocky exoplanets within the habitable zone of their stars. Clearly, what we know about our planet will be our guideline for the characterization of such planets. However, the Earth has been inhabited for at least 3.8 Gyr and… 

Figures and Tables from this paper

Exoplanet Biosignatures: Observational Prospects
TLDR
The observability of not only the proposed biosignature candidates themselves but also of more general planetary properties that provide circumstantial evidence are discussed, since the evaluation of any biosignatures candidate relies on its context.
IS THE PALE BLUE DOT UNIQUE? OPTIMIZED PHOTOMETRIC BANDS FOR IDENTIFYING EARTH-LIKE EXOPLANETS
The next generation of ground- and space-based telescopes will image habitable planets around nearby stars. A growing literature describes how to characterize such planets with spectroscopy, but less
Theoretical Reflectance Spectra of Earth-like Planets through Their Evolutions: Impact of Clouds on the Detectability of Oxygen, Water, and Methane with Future Direct Imaging Missions
In the near-future, atmospheric characterization of Earth-like planets in the habitable zone will become possible via reflectance spectroscopy with future telescopes such as the proposed LUVOIR and
The Dawes Review 3: The Atmospheres of Extrasolar Planets and Brown Dwarfs
  • J. Bailey
  • Geology, Physics
    Publications of the Astronomical Society of Australia
  • 2014
Abstract The last few years has seen a dramatic increase in the number of exoplanets known and in the range of methods for characterising their atmospheric properties. At the same time, new
How to Characterize Habitable Worlds and Signs of Life
The detection of exoplanets orbiting other stars has revolutionized our view of the cosmos. First results suggest that it is teeming with a fascinating diversity of rocky planets, including those in
Exoplanetary Biosignatures for Astrobiology
  • J. Grenfell
  • Geology, Physics
    Biosignatures for Astrobiology
  • 2018
Since life evolved on our planet there have been subtle interplays between biology and Earth System Components (atmosphere-lithosphere-ocean-interior). Life, for example, can impact weathering rates
Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life
TLDR
A comprehensive overview of the current understanding of potential exoplanet biosignatures, including gaseous, surface, and temporal biosignature features, focuses particularly on advances made since the seminal review by Des Marais et al.
Reflections on O2 as a Biosignature in Exoplanetary Atmospheres
TLDR
Environmental factors for abiotic O2 have been identified and will improve the ability to choose optimal targets and measurements to guard against false positives, and thorough evaluation of potential biosignatures works to increase confidence in life detection.
Exploring Habitability Markers, Biosignatures, and Their False Positives Using Spectral Models of Terrestrial Exoplanets
Exploring Habitability Markers, Biosignatures, and Their False Positives Using Spectral Models of Terrestrial Exoplanets Edward W. Schwieterman Chair of the Supervisory Committee: Professor Victoria
Nonphotosynthetic Pigments as Potential Biosignatures
TLDR
It is demonstrated that, given sufficient surface coverage, nonphotosynthetic pigments could significantly impact the disk-averaged spectrum of a planet and determination of substantial coverage by biologically produced pigments would be difficult with broadband colors alone and would likely require spectrally resolved data.
...
...

References

SHOWING 1-10 OF 79 REFERENCES
Characterization of extrasolar terrestrial planets from diurnal photometric variability
TLDR
A model is reported that predicts features that should be discernible in the light curve obtained by low-precision photometry, which suggests that the meteorological variability, composition of the surface, and rotation period of an Earth-like planet could be derived from photometric observations.
CHARACTERIZING THE ATMOSPHERES OF TRANSITING ROCKY PLANETS AROUND LATE-TYPE DWARFS
Visible and near-infrared spectra of transiting hot Jupiter planets have recently been observed, revealing some of the atmospheric constituents of their atmospheres. In the near future, it is
Spectral Evolution of an Earth-like Planet
We have developed a characterization of the geological evolution of the Earth's atmosphere and surface in order to model the observable spectra of an Earth-like planet through its geological history.
Identifying the Rotation Rate and the Presence of Dynamic Weather on Extrasolar Earth-like Planets from Photometric Observations
With the recent discoveries of hundreds of extrasolar planets, the search for planets like Earth and life in the universe is quickly gaining momentum. In the future, large space observatories could
Spectral signatures of photosynthesis. II. Coevolution with other stars and the atmosphere on extrasolar worlds.
TLDR
M star planets could be a half to a tenth as productive as Earth in the visible, but exceed Earth if useful photons extend to 1.1 microm for anoxygenic photosynthesis, and under water, organisms would still be able to survive ultraviolet flares from young M stars and acquire adequate light for growth.
ALIEN MAPS OF AN OCEAN-BEARING WORLD
When Earth-mass extrasolar planets first become detectable, one challenge will be to determine which of these worlds harbor liquid water, a widely used criterion for habitability. Some of the first
ON THE EFFECTS OF THE EVOLUTION OF MICROBIAL MATS AND LAND PLANTS ON THE EARTH AS A PLANET. PHOTOMETRIC AND SPECTROSCOPIC LIGHT CURVES OF PALEO-EARTHS
Understanding the spectral and photometric variability of the Earth and the rest of the solar system planets has become of utmost importance for the future characterization of rocky exoplanets. As
RECONSTRUCTING THE PHOTOMETRIC LIGHT CURVES OF EARTH AS A PLANET ALONG ITS HISTORY
By utilizing satellite-based estimations of the distribution of clouds, we have studied Earth's large-scale cloudiness behavior according to latitude and surface types (ice, water, vegetation, and
Detectability of planetary characteristics in disk-averaged spectra. I: The Earth model.
TLDR
A spatially and spectrally resolved model of the Earth is developed and comparison between the data and model indicates that several atmospheric species can be identified in disk-averaged Earth spectra, and potentially detected depending on the wavelength range and resolving power of the instrument.
VIEWS FROM EPOXI: COLORS IN OUR SOLAR SYSTEM AS AN ANALOG FOR EXTRASOLAR PLANETS
The first visible-light studies of Earth-sized extrasolar planets will employ photometry or low-resolution spectroscopy. This work uses EPOCh medium-band filter photometry between 350 and 950 nm
...
...