Monday, 19 August, 2019

Earth-like world among new trio of planets outside our solar system

The star and its planet could provide valuable information on how planetary bodies form The star and its planet could provide valuable information on how planetary bodies form
Sandra Phillips | 30 July, 2019, 15:00

The NASA satellite latest discovery found the trio of exoplanets orbit the star every 3.4, 5.7 and 11.4 Earth days, respectively. Temperatures given for TOI 270 planets are equilibrium temperatures, calculated without taking into account the. Guenther hopes to measure the planets' atmospheres, learn their exact masses, and observe them through several different telescopes. The planets straddle an observed gap within the sizes of known planets and promise to be among the most curious targets for future research.

"TOI-270 is a true Disneyland for exoplanet science, and one of the prime systems TESS was set up to discover", he said. It is around 40 percent smaller than our sun in size and mass, with a surface temperature around one-third cooler.

The planetary system, which astronomers have dubbed TOI-270, lies about 73 light-years away in the southern constellation of Pictor.

And last, though very much not least, Kruse and colleagues have found 73 newly identified reciprocally transiting planet candidates. Because the stars in question are red dwarfs that are located reasonably close to Earth, and because the system is arranged so that the planet passes between the stars and Earth, scientists may actually be able to get a glimpse of any gases surrounding the planet using telescopes based on Earth.

Within the system known as TOI-270 there is a rocky super-Earth that is slightly larger than our own planet, as well as two gaseous sub-Neptunes, roughly twice Earth's size. The calm nature of the star, along with its high luminosity thanks to its relative proximity relative to Earth, makes TOI 270 an excellent prospect for exoplanet scientists.

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The innermost planet, TOI-270b, is the super-Earth, while the others - TOI-270c and TOI-270d - are the Sub-Neptunes. The Sub-Neptunes are similar in size to the rocky planets in our own solar system.

They are all likely too close to the star and, therefore, are too warm to be capable of hosting alien life. "We don't have a planet quite like this in our solar system". These could also offer clues about how our own solar system formed. Chief among those reasons is the search for habitable planets. The other two are icy "sub-Neptunes" that are about half the size of Neptune. The study published this week in the journal The Astrophysical Journal Letters described the host star and its planet named DS Tuc Ab, aged approximately 45 million years old, which is a "pre-teen" in planetary time.

"The star's brightness lets us study the planet in detail because the more photons you have the better statistics you have". "It will be observable by Webb for over half a year, which could allow for really interesting comparison studies between the atmospheres of TOI 270 c and d". To qualify as an exoplanet, the object must make at least three transits in TESS data in addition to passing other checks to make sure the transits weren't false positives caused by a companion star or eclipse.

TESS is a NASA Astrophysics Explorer mission led and operated by MIT in Cambridge, Massachusetts, and managed by NASA's Goddard Space Flight Center.

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