A new “Super-Earth” exoplanet has been located that has an extremely high daytime temperature—around 725° C—making it one of the most extreme rocky bodies discovered outside the solar system. Super-Earths are defined as giant planets that are larger than the Earth yet smaller than Neptunian Ice Giants, and they can provide significant amounts of information about how planets form and how their atmospheres behave in the presence of high levels of stellar radiation.
A New Extreme World Identified
The planet currently orbits extremely close to its parent star (the Sun or some other star), which is responsible for the planet’s extremely high temperature. Due to this proximity, the insulated star emits a great deal of stellar radiation towards the planet (the Planet’s surface) causing the temperature of the planet’s surface to be high enough that many common metals would melt at that temperature if they were present on the planet.
How the Planet Was Found?
The planet cannot be home to any form of life as we know it, but it is of great scientific interest due to the knowledge that we can gain from studying this exoplanet (these types of planets). The planet was found using space-borne telescopes and observing the star using the transit method (where astronomers watch for the brightness of the star to periodically dip as the planet blocks the starlight from your eyes as it passes between the star and your eyes). From this data, astronomers calculate the size of the planet, its orbital period, and the distance the planet is from its star.
Further observations utilizing spectroscopy permitted scientists to accurately measure the temperatures of the planets as well as provide possible information about their atmospheres; based upon the collected data, it appears that there may be either no atmosphere at all or a very tenuous atmosphere surrounding this planet, therefore allowing for direct exposure of the planetary surface to stellar radiation.
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Extreme Temperatures recorded
Super-Earth can reach daily daytime temperatures (approximately 725°C) that far exceed those found on the surface of Venus (approximately 465°C). This extreme heat will likely result in the development of a molten to partially molten surface of the super-Earth due to its proximity to the heat radiation of the star, which could vastly consist of lava plains and or large bodies of magma.
The scientists also believe that this planet is likely to be tidally locked, which means that one side of the planet will always face its star while the opposite side will remain in complete darkness. As such, there may be a significant difference in temperature between the two sides of the planet. The nighttime side of this planet could possibly be much colder than the daytime side of this planet, however both would be considered to have extreme temperatures when compared to the average temperature of Earth.
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The Value of Super-Earths
Super-Earths constitute a unique category in the study of planetary sciences because there are no examples of super-Earths that exist in the solar system; therefore, each discovery will provide scientists with the necessary information to broaden our understanding of the diversity of planets in the universe. Studies of super-Earths will allow scientists to improve their models of how planets are composed, the way they are structured, and how they function within their atmosphere.
The discovery of this extreme Super-Earth raises serious questions regarding existing theories on the nature of rocky planets and their responses to such high temperatures. Will these planets maintain atmospheres? Will they have large-scale eruptive events? These questions induce further scientific investigation and the planning of additional spacecraft missions to these types of extrasolar planet systems.
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Impact of Habitable Research
Despite being far too hot to support life, the study of the newly discovered planet adds to the larger picture of how to find other habitable exoplanet by helping researchers understand the range of conditions under which life can exist.
Comparative data gathered from this extremely hot Super-Earth and the more “Earth-like” habitable Super-Earths found to date will allow scientists to better refine what is known as the “habitable zone,” or the area around a star that allows for the presence of liquid water on a planet’s surface. This comparative information will also improve the potential for scientists to translate atmospheric data retrieved when searching for bio-signatures on distant exoplanets.
Development of Technology that Made the Discovery Possible
This discovery demonstrates the expanding capabilities of today’s astronomical instruments. Space telescopes containing modern sensitive detectors are now capable of analyzing light from distant stars with a vastly increased sensitivity than was previously possible. This allows astronomers to not only discover exoplanets but to also derive their physical and chemical properties from distant star light.
Coming missions will push for further distances and will also enable direct imaging of some exoplanets and allow for more in-depth studies of their atmospheres, potentially helping to figure out if other more temperate worlds exist along the same lines. The 725°C super-Earth example demonstrates the diversity of planets in our galaxy. The continuum of planets that exist, from totally frozen gas giants to extremely heated rocky worlds, is both useful for broadening our knowledge of planetary habitats and challenging to our existing ideas.
A Glimpse Into the Universe’s Diversity
As we continue to learn more about the many different kinds of worlds, more new planets will make larger contributions toward solving the overall model of how planetary systems form and evolve. This one world, while not several hundred million years and hasn’t really been hospitable for any length of time, serves as a beautiful reminder of the large and diverse universe and how many more worlds we have yet to discover.
