Astronomers have discovered a distant planet that they think could be completely covered in water, making it a prime target for future study by the James Webb Space Telescope.
The planet is called TOI-1452 b and it is located around 100
light years away from Earth, orbiting one of a pair of stars in the Draco
constellation.
Planets that orbit stars outside of the solar system are
known as exoplanets, and it is a relatively new area of research. The first
exoplanet was discovered as recently as 1992.
Since then, exoplanet discovery has become almost routine
with NASA saying that more than 5,000 had been confirmed in March this year.
This sounds like a lot, but it would be a stretch to say
that it even scratches the surface. Based on data from NASA's Kepler Space
Telescope, it is estimated that there are more than a trillion planets in our
galaxy alone. Statistically, many of them will be in Earth's size range and may
be within the habitable zone of their star—close enough to be sufficiently warm
for life and liquid water but not so close as to make the planet unsuitably
hot.
The search for life is an interesting aspect of exoplanet
research. To date, scientists have yet to find evidence of extra-terrestrial
life on other worlds or even any planets that they know are likely to host it.
But there are some exciting candidates.
In a study published in The Astronomical Journal on August
12, dozens of researchers from institutions around the world confirmed the
existence of TOI-1452 b using the Transiting Exoplaney Survey Satellite (TESS)
as well as the Observatoire du Mont-Mégantic in Canada and the MuSCAT3
telescope in Hawaii.
The planet is thought to be around 70 percent larger than
Earth and nearly five times heavier. It orbits its star once every 11 days or
so, and is thought to be temperate. It also orbits in a binary star system, in which
two stars orbit one another at a distance roughly two-and-a-half times that
from our own sun to Pluto.
What is interesting about the TOI-1452 b is that evidence
suggests it might be an ocean world. In fact, it is one of the best candidates
for such a planet ever to be found, according to Charles Cadieux, a Ph.D.
student at the Université de Montréal who led the international team of
researchers to study the planet.
"Its radius and mass suggest a much lower density than
what one would expect for a planet that is basically made up of metal and rock,
like Earth," Cadieux said in a university press release.
Analysis has suggested that water might make up as much as 30 percent of the planet's mass—a proportion similar to some solar system moons like Titan or Ganymede.
0 comments:
Post a Comment