Habitable moons around extrasolar giant planets

  title={Habitable moons around extrasolar giant planets},
  author={Darren M. Williams and James F Kasting and Richard Alan Wade},
Possible planetary objects have now been discovered1–9 orbiting nine different main-sequence stars. These companion objects (some of which might actually be brown dwarfs) all have a mass at least half that of Jupiter, and are therefore unlikely to be hospitable to Earth-like life: jovian planets and brown dwarfs support neither a solid nor a liquid surface near which organisms might dwell. Here we argue that rocky moons orbiting these companions could be habitable if the planet–moon system… 
Transits of extrasolar moons around luminous giant planets
Beyond Earth-like planets, moons can be habitable, too. No exomoons have been securely detected, but they could be extremely abundant. Young Jovian planets can be as hot as late M stars, with
Looking for planetary moons in the spectra of distant Jupiters.
A possible way of detecting Earth-sized moons with future technology by taking advantage of spectral contrast of Jovian-sized planets near the habitable zones of main-sequence stars to discern which extrasolar giant planets have Earth-like moons capable of supporting life.
Exomoons: from icy to temperate worlds
Giant planets may host significant populations of moons. In our own solar system, Jupiter and Saturn together harbor over 120 natural satellites, six of which have diameters between 1500 and more
Resonant Removal of Exomoons During Planetary Migration
Jupiter and Saturn play host to an impressive array of satellites, making it reasonable to suspect that similar systems of moons might exist around giant extrasolar planets. Furthermore, a
With most planets and planetary candidates detected in the stellar habitable zone (HZ) being super-Earths and gas giants rather than Earth-like planets, we naturally wonder if their moons could be
Stability of Satellites around Close-in Extrasolar Giant Planets
We investigate the long-term dynamical stability of hypothetical moons orbiting extrasolar giant planets. Stellar tides brake a planet's rotation and, together with tidal migration, act to remove
Moons of giant planets may represent an alternative to the classical picture of habitable worlds. They may exist within the circumstellar habitable zone of a parent star, and through tidal energy
Worlds without Moons: Exomoon Constraints for Compact Planetary Systems
One of the primary surprises of exoplanet detections has been the discovery of compact planetary systems, whereby numerous planets reside within ~0.5 au of the host star. Many of these kinds of
Tides, planetary companions, and habitability: habitability in the habitable zone of low-mass stars
Earth-scale planets in the classical habitable zone (HZ) are more likely to be habitable if they possess active geophysics. Without a constant internal energy source, planets cool as they age,
Habitable planets around white and brown dwarfs: the perils of a cooling primary.
The future habitability of the planet candidates KOI 55.01 and 55.02 is considered in these terms and it is found they are unlikely to become habitable.


The unseen companion of HD114762: a probable brown dwarf
BROWN dwarfs are substellar objects with too little mass to ignite hydrogen in their cores. Despite considerable effort to detect brown dwarfs astrometrically1–4, photometrically4–9, and
Orbital migration of the planetary companion of 51 Pegasi to its present location
THE recent discovery1 and confirmation2 of a possible planetary companion orbiting the solar-type star 51 Pegasi represent a breakthrough in the search for extrasolar planetary systems. Analysis of
A Planet Orbiting 47 Ursae Majoris
The G0 V star 47 UMa exhibits very low amplitude radial velocity variations having a period of 2.98 yr, a velocity amplitude of K = 45.5 m s-1, and small eccentricity. The residuals scatter by 11 m
Habitable zones around main sequence stars.
The results suggest that mid-to-early K stars should be considered along with G stars as optimal candidates in the search for extraterrestrial life.
Dynamical Instabilities and the Formation of Extrasolar Planetary Systems
The existence of a dominant massive planet, Jupiter, in our solar system, although perhaps essential for long-term dynamical stability and the development of life, may not be typical of planetary
A Planetary Companion to 70 Virginis
An extremely low mass companion to the solar-type star 70 Virginis is inferred from the observed periodic Doppler reflex motion of the primary during 8 yr. The minimum mass (M2 sin i) of 70 Vir "B"
A Theory of Extrasolar Giant Planets
We present a broad suite of models of extrasolar giant planets (EGP's), ranging in mass from 0.3 to 15 Jupiter masses. The models predict luminosity (both reflected and emitted) as a function of age,
Influx of cometary volatiles to planetary moons: the atmospheres of 1000 possible Titans.
The true cometary flux was most likely larger than that derived from crater records, which raises the probability that Titan, Ganymede, and Callisto acquired substantial atmospheres, but other loss processes are potentially capable of eliminating small atmospheres over the age of the solar system.
A Jupiter-mass companion to a solar-type star
The presence of a Jupiter-mass companion to the star 51 Pegasi is inferred from observations of periodic variations in the star's radial velocity. The companion lies only about eight million
Discovery of Ganymede's magnetic field by the Galileo spacecraft
THE Galileo spacecraft has now passed close to Jupiter's largest moon—Ganymede—on two occasions, the first at an altitude of 838 km, and the second at an altitude of just 264 km. Here we report the