inhabited exomoon by artist dan durda

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Inhabited exomoon by artist Dan Durda

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

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Page 1: Inhabited exomoon by artist Dan  Durda

Inhabited exomoon by artist Dan DurdaInhabited exomoon by artist Dan Durda

Page 2: Inhabited exomoon by artist Dan  Durda

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.

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.

Thought-experiment: Develop a short story using this theme and the accompanying data on the next slide

Thought-experiment: Develop a short story using this theme and the accompanying data on the next slide

Page 3: Inhabited exomoon by artist Dan  Durda

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 1010 Newtons/meter2. The exomoon has

land and oceans.

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 1010 Newtons/meter2. The exomoon has

land and oceans.

Page 4: Inhabited exomoon by artist Dan  Durda
Page 5: Inhabited exomoon by artist Dan  Durda

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

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

“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.”

“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.”

Page 6: Inhabited exomoon by artist Dan  Durda

Sagan C., et al. (1993) A search for life on

Earth from the Galileo spacecraft. Nature,

365, 715-721.

Sagan C., et al. (1993) A search for life on

Earth from the Galileo spacecraft. Nature,

365, 715-721.

Page 7: Inhabited exomoon by artist Dan  Durda

Inhabited exomoon by artist Dan DurdaInhabited exomoon by artist Dan Durda

Page 8: Inhabited exomoon by artist Dan  Durda

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

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

Page 9: Inhabited exomoon by artist Dan  Durda

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

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

Earth’s spectral signaturesEarth’s spectral signaturesEarth’s spectral signaturesEarth’s spectral signatures

Visible Near infrared

Page 10: Inhabited exomoon by artist Dan  Durda

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

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

Earth’s infrared spectrum (black line) at 6-20 µm Earth’s infrared spectrum (black line) at 6-20 µm Earth’s infrared spectrum (black line) at 6-20 µm Earth’s infrared spectrum (black line) at 6-20 µm

Infrared

Page 11: Inhabited exomoon by artist Dan  Durda

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

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

Comparisons of thermal infrared emissions as an indicator of oceans and/or thick atmosphere (right)

during 1 orbital phase (left)

Comparisons of thermal infrared emissions as an indicator of oceans and/or thick atmosphere (right)

during 1 orbital phase (left)

Page 12: Inhabited exomoon by artist Dan  Durda

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

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

Page 13: Inhabited exomoon by artist Dan  Durda

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

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

Oxygen cycle on EarthOxygen cycle on Earth

Page 14: Inhabited exomoon by artist Dan  Durda

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

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

Page 15: Inhabited exomoon by artist Dan  Durda

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

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

Hypothesized changes in Earth’s visible and infrared spectra through its geological history

Hypothesized changes in Earth’s visible and infrared spectra through its geological history

Page 16: Inhabited exomoon by artist Dan  Durda

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

Contrast ratio of absorption features by an Earth-like atmosphere during transit of an exomoon for M9, M5, and solar-type stars

Contrast ratio of absorption features by an Earth-like atmosphere during transit of an exomoon for M9, M5, and solar-type stars

Page 17: Inhabited exomoon by artist Dan  Durda

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

Parameters associated with transits of Jupiter-sized exoplanets orbiting in the Earth-equivalent habitable zone of M0-M9 starsParameters associated with transits of Jupiter-sized exoplanets orbiting in the Earth-equivalent habitable zone of M0-M9 stars

Page 18: Inhabited exomoon by artist Dan  Durda

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

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

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

Page 19: Inhabited exomoon by artist Dan  Durda

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

“… 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,…”

“… 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,…”

Page 20: Inhabited exomoon by artist Dan  Durda

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

Kaltenegger L. (2010) Characterizing habitable exomoons. Astrophysical Journal Letters, 712, L125-L130.

RH = Hill radius = maximum stable distance of a satellite from its host-planet

Mp = mass of host-planetMstar = mass of star

ep = eccentricity of planet’s orbiteSat = eccentricity of exomoon’s orbit

aeR = critical semi-major axis of satellite with retrograde orbitaeP = critical semi-major axis of satellite with prograde orbit

RH = Hill radius = maximum stable distance of a satellite from its host-planet

Mp = mass of host-planetMstar = mass of star

ep = eccentricity of planet’s orbiteSat = eccentricity of exomoon’s orbit

aeR = critical semi-major axis of satellite with retrograde orbitaeP = critical semi-major axis of satellite with prograde orbit