Discovery of a new Planet HD 21749b Outside Our Solar System

NASA's TESS mission
HD 21749

NASA’s TESS mission, which will study the whole sky throughout the following two years, has officially found three new exoplanets around adjacent stars.

NASA’s Transiting Exoplanet Survey Satellite, TESS, has found a third little planet outside our close planetary system, researchers declared for this present week at the yearly American Astronomical Society meeting in Seattle.

The new planet, named HD 21749b, circles a splendid, adjacent dwarf star around 53 light years away, in the group of stars Reticulum, and seems to have the longest orbital time of the three planets so far recognized by TESS. HD 21749b voyages around its star in 36 days, contrasted with the two different planets — Pi Mensae b, a “super-Earth” with a 6.3-day circle, and LHS 3844b, a rocky world that speeds around its star in only 11 hours. Each of the three planets were found in the initial three months of TESS sky survey.

The surface of the new planet is likely around 300 degrees Fahrenheit — moderately cool, given its vicinity to its star, which is nearly as brilliant as the sun.

“It’s the coolest earth that we are aware of around a star this luminosity,” says Diana Dragomir, a postdoc in MIT’s Kavli Institute for Astrophysics and Space Research, who drove the new discovery. “We know a ton about airs of hot planets, but since it’s elusive little planets that circle more remote from their stars, and are cooler, we haven’t possessed the capacity to find out much about these small, cooler planets. Yet, here we were fortunate, and got this one, and would now be able to think about it in more detail.”

The planet is around multiple times the extent of Earth, which places it in the class of a “sub-Neptune.” Surprisingly, it is likewise an incredible multiple times as huge as the Earth. In any case, it is improbable that the planet is rocky and in this manner fit to live in; it’s almost certain made of gas, of a benevolent that is substantially more thick than the climates of either Neptune or Uranus.

"We figure this planet wouldn't be as gaseous as Neptune or Uranus, which are for the most part hydrogen and extremely puffy," Dragomir says. "The planet likely has a compactness of water, or a dense atmosphere."

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