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Inhabited exomoon by artist Dan Durda

Inhabited exomoon by artist Dan Durda. Thought-experiment: Develop a short story using this theme and the accompanying data on the next slide.

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Inhabited exomoon by artist Dan Durda

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  1. Inhabited exomoon by artist Dan Durda

  2. Thought-experiment:Develop a short story using this theme and the accompanying data on the next slide Imagine a terrestrial-type exomoon orbiting a Jovian-type planet within the habitable zone of a star. This exomoon has a thick, cloudy atmosphere that completely fills the sky, except for breaks in the clouds that occur about once every 400 years. When a break does occur, it is short-lived and reveals only a small area of the sky. Describe the civilization on this exomoon that has rarely seen beyond the clouds, including its culture and value system.

  3. F5 star Mass ~2.8 x 1030 kg, luminosity ~ 3.0 x 1027 watts, and radius ~ 1.4 x 109 meters. Jovian planet Mass ~1.6 x 1027 kg, density ~1 .2 grams/cm3, radius ~ 6.9 x 107 meters, semi-major axis of planet’s orbit ~ 2.5 x 1011 meters, and orbital eccentricity ~ 0.00. Terrestrial-type exomoon Mass ~ 8.4 x 1024 kg, albedo ~ 0.67, semi-major axis of exomoon’s orbit ~ 5.8 x 109 meters, orbital eccentricity ~ 0.00, radius = 7.27 x 106 meters, and rigidity of exomoon ~ 3 x 1010Newtons/meter2. The exomoon has land and oceans.

  4. “In its December 1990 fly-by of Earth, the Galileo spacecraft found evidence of abundant gaseous oxygen, a widely distributed surface pigment with a sharp absorption edge in the red part of the visible spectrum, and atmospheric methane in extreme thermodynamic disequilibrium; together, these are strongly suggestive of life on Earth.” Sagan C., et al. (1993) A search for life on Earth from the Galileo spacecraft. Nature, 365, 715-721.

  5. Sagan C., et al. (1993) A search for life on Earth from the Galileo spacecraft. Nature, 365, 715-721.

  6. Inhabited exomoon by artist Dan Durda

  7. Kaltenegger L., et al. (2010) Deciphering spectral fingerprints of habitable exoplanets. Astrobiology, 10(1), 89-102.

  8. Earth’s spectral signatures Near infrared Visible Kaltenegger L., et al. (2010) Deciphering spectral fingerprints of habitable exoplanets. Astrobiology, 10(1), 89-102.

  9. Earth’s infrared spectrum (black line) at 6-20 µm Infrared Kaltenegger L., et al. (2010) Deciphering spectral fingerprints of habitable exoplanets. Astrobiology, 10(1), 89-102.

  10. Comparisons of thermal infrared emissions as an indicator of oceans and/or thick atmosphere (right) during 1 orbital phase (left) Kaltenegger L., et al. (2010) Deciphering spectral fingerprints of habitable exoplanets. Astrobiology, 10(1), 89-102.

  11. Kaltenegger L., et al. (2010) Deciphering spectral fingerprints of habitable exoplanets. Astrobiology, 10(1), 89-102.

  12. Oxygen cycle on Earth Kaltenegger L., et al. (2010) Deciphering spectral fingerprints of habitable exoplanets. Astrobiology, 10(1), 89-102.

  13. Changes in the Earth’s atmospheric (O2/N2) ratio during 2000-2004

  14. Hypothesized changes in Earth’s visible and infrared spectra through its geological history Kaltenegger L., et al. (2010) Deciphering spectral fingerprints of habitable exoplanets. Astrobiology, 10(1), 89-102.

  15. Contrast ratio of absorption features by an Earth-like atmosphere during transit of an exomoon for M9, M5, and solar-type stars Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

  16. Parameters associated with transits of Jupiter-sized exoplanets orbiting in the Earth-equivalent habitable zone of M0-M9 stars Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

  17. Maximum orbital separation of an Earth-like exomoon (in prograde and retrograde orbits) from its Jovian host-planet (in stellar radii) for 1MJ and 13MJ Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

  18. “… habitable exomoons around M stars would be tidally locked to their planet, not to their host star, removing the problem of a potential freeze out of the atmosphere on the dark side of an Earth-like exomoon,…” Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

  19. RH = Hill radius = maximum stable distance of a satellite from its host-planet Mp = mass of host-planet Mstar = mass of star ep = eccentricity of planet’s orbit eSat = eccentricity of exomoon’s orbit aeR = critical semi-major axis of satellite with retrograde orbit aeP = critical semi-major axis of satellite with prograde orbit Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

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