XPost: alt.astronomy, alt.fan.heinlein
from
https://news.ufl.edu/2023/05/exoplanet-habitability-/
One-third of galaxy’s most common planets could be in habitable zone
An artist's conception of three exoplanets orbiting a red star
Many exoplanets orbiting common, small stars like this one could host
liquid water and potentially life. (NASA/JPL-Caltech)
In a new analysis based on the latest telescope data, University of
Florida astronomers have discovered that a third of the planets around
the most common stars in the galaxy could be in a goldilocks orbit close enough, and gentle enough, to hold onto liquid water – and possibly
harbor life.
The remaining two-thirds of the planets around these ubiquitous small
stars are likely roasted by gravitational tides, sterilizing them.
UF astronomy professor Sarah Ballard and doctoral student Sheila Sagear published their findings the week of May 29 in the Proceedings of the
National Academy of Sciences. Ballard and Sagear have long studied
exoplanets, those worlds that orbit stars other than the sun.
“I think this result is really important for the next decade of
exoplanet research, because eyes are shifting toward this population of stars,” Sagear said. “These stars are excellent targets to look for
small planets in an orbit where it’s conceivable that water might be
liquid and therefore the planet might be habitable.”
Our familiar, warm, yellow sun is a relative rarity in the Milky Way. By
far the most common stars are considerably smaller and cooler, sporting
just half the mass of our sun at most. Billions of planets orbit these
common dwarf stars in our galaxy.
Scientists think that liquid water is required for life to evolve on
other planets, like it did on Earth. Because these dwarf stars are
cooler, any planets would have to huddle very close to their star to
draw enough warmth to host liquid water. However, these close orbits
leave the planets susceptible to extreme tidal forces caused by the
star’s gravitational effect on the planets.
Sagear and Ballard measured the eccentricity – how oval the orbit is –
of a sample of more than 150 planets around these dwarf stars, which are
about the size of Jupiter. If a planet orbits close enough to its star,
at about the distance that Mercury orbits the sun, an eccentric orbit
can subject it to a process known as tidal heating. As the planet is
stretched and deformed by changing gravitational forces on its irregular
orbit, friction heats it up. At the extreme end, this could bake the
planet, removing all chance for liquid water.
“It’s only for these small stars that the zone of habitability is close enough for these tidal forces to be relevant,” Ballard said.
Data came from NASA’s Kepler telescope, which captures information about exoplanets as they move in front of their host stars. To measure the
planets’ orbits, Ballard and Sagear focused especially on how long the planets took to move across the face of the stars. Their study also
relied on new data from the Gaia telescope, which measured the distance
to billions of stars in the galaxy.
“The distance is really the key piece of information we were missing
before that allows us to do this analysis now,” Sagear said.
Sagear and Ballard found that stars with multiple planets were the most
likely to have the kind of circular orbits that allow them to retain
liquid water. Stars with only one planet were the most likely to see
tidal extremes that would sterilize the surface.
Since one-third of the planets in this small sample had gentle enough
orbits to potentially host liquid water, that likely means that the
Milky Way has hundreds of millions of promising targets to probe for
signs of life outside our solar system.
Eric Hamilton
May 30, 2023
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