Tides, planetary companions, and habitability: habitability in the habitable zone of low-mass stars

  title={Tides, planetary companions, and habitability: habitability in the habitable zone of low-mass stars},
  author={Christa L. Van Laerhoven and Rory Barnes and Richard Greenberg},
  journal={Monthly Notices of the Royal Astronomical Society},
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, eventually terminating tectonic activity and rendering the planet sterile to life. However, for planets orbiting low-mass stars, the presence of an outer companion could generate enough tidal heat in the HZ planet to prevent such cooling. The range of mass and orbital parameters for the companion that… 
The Habitability of Planets Orbiting M-dwarf Stars
Tidal Heating of Earth-like Exoplanets around M Stars: Thermal, Magnetic, and Orbital Evolutions
A thermal-orbital evolution model calibrated to Earth that couples tidal dissipation, with a temperature-dependent Maxwell rheology, to orbital circularization and migration is developed and identifies a peak in the internal dissipation rate as the mantle passes through a viscoelastic state at mantle temperatures near 1800 K.
Tidal locking of habitable exoplanets
Potentially habitable planets can orbit close enough to their host star that the differential gravity across their diameters can produce an elongated shape. Frictional forces inside the planet
Tidal Decay of Circumbinary Planetary Systems
It is shown that circumbinary planetary systems are subject to universal tidal decay (shrinkage of orbits), caused by the forced orbital eccentricity inherent to them. Circumbinary planets (CBPs) are
The subsurface habitability of small, icy exomoons
Context. Assuming our Solar System as typical, exomoons may outnumber exoplanets. If their habitability fraction is similar, they would thus constitute the largest portion of habitable real estate in
Habitability Properties of Circumbinary Planets
It is shown that several habitability conditions (in fact, at least seven such conditions) appear to be fulfilled automatically by circumbinary planets of main-sequence stars (CBP-MS), whereas on
On the spin states of habitable zone exoplanets around M dwarfs: the effect of a near-resonant companion
One longstanding problem for the potential habitability of planets within M dwarf systems is their likelihood to be tidally locked in a synchronously rotating spin state. This problem thus far has
Orbital evolution of potentially habitable planets of tidally interacting binary stars
We simulate the coupled stellar and tidal evolution of short-period binary stars (orbital period Porb ≲ 8 days) to investigate the orbital oscillations, instellation cycles, and orbital stability of
Habitability of polar regions in tidally locked extrasolar planet near the M-Dwarf stars
Since the launch of Kepler and Hubble more than a decade ago, we have come a long way in the quest to find a potentially habitable exoplanet. To date, we have already discovered more than 4000


Tides and the evolution of planetary habitability.
The tidal evolution of hypothetical terrestrial planets around low-mass stars is calculated and it is shown that tides can evolve planets past the inner edge of the habitable zone, sometimes in less than 1 billion years.
Tidal heating of terrestrial extrasolar planets and implications for their habitability
The tidal heating of hypothetical rocky (or terrestrial) extrasolar planets spans a wide range of values depending on stellar masses and initial orbits. Tidal heating may be sufficiently large (in
The habitable zones (HZs) of main-sequence stars have traditionally been defined as the range of orbits that intercept the appropriate amount of stellar flux to permit surface water on a planet.
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
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.
Tidal Venuses: triggering a climate catastrophe via tidal heating.
It is shown that terrestrial exoplanets orbiting low-mass stars may be tidally heated at high-enough levels to induce a runaway greenhouse for a long-enough duration for all the hydrogen to escape, and this results represent a fundamental revision to the HZ for noncircular orbits.
Tidal Evolution of Close-In Extra-Solar Planets
Observed population of giant planets around evolved stars shows a paucity of planets with semi-major axes below 0.5 au, in contrast to main sequence stars where those planets are present. This lack
We report the discovery of an Earth-sized planet (1.16 ± 0.19 R⊕) in an 8.5 hr orbit around a late G-type star (KIC 8435766, Kepler-xx). The object was identified in a search for short-period planets
Habitable zone lifetimes of exoplanets around main sequence stars.
The results show that exoplanet HD 85512b is no longer within the HZ, assuming it has an Earth analog atmosphere, and should be considered in future models of planetary habitability as setting an upper limit on the lifetime of any potential exoplanetary biosphere.
Tidal Evolution of the Planetary System around HD 83443
Two planets with an orbital period ratio of approximately 10 : 1 have been discovered around the star HD 83443. The inner and more massive planet, HD 83443b, has the smallest semimajor axis among all