Researchers report on a study accepted in the journal And the Discovered by tes of two Oddly enough, similar to Earth. Named HD 260655b and HD 260655c, these two super-planets orbit around a Red, HD 260655, 33 light-years away. The distance that makes this system “The fourth closest known multiplanet system after HD 219134, LTT 1445 A and AU Mic”Study details.
Two new uninhabitable super-Earths
space telescope(Transiting Exoplanet Survey Satellite) NASA from 2018 to Associated with the bright stars closest to us. To do this, he uses the transit method: it consists of targeting a star for a sufficient amount of time to notice differences in Periodic, due to the passage of a planet in front of its host star. Using this, scientists can then track the diameter of the planet, using the steepness of the brightness and the size of its star.
In the case of the red dwarf HD 260655, it is much smaller than the red dwarfBut nonetheless bright enough, the researchers also identified thanks to . It makes it possible to deduce the effect of gravity exerted on the star, by observing the periodic changes in its luminous spectrum: when the radial velocity of the star changes, the lines of Transformation. “Every planet in around a star that will have a small gravitational force on its starExplains Michelle Kunimoto, a postdoctoral researcher at the Massachusetts Institute of Technology (Massachusetts Institute of Technology) And who participated in the discovery of two exoplanets. “What we are looking for is very light From this star which may indicate that a collective planetary body called it. »
From these data, it is possible to deduce the mass that causes this effect, and therefore the mass of the exoplanet. In combination with the diameter, the researchers infer the density of two exoplanets: since this is similar to the density of Earth, it is very likely that they correspond toas such And the and the earth and . With a mass and volume close to Earth, this makes it a super-Earth. However, it turned out to be uninhabitable: with narrow orbits close to its star, temperatures that scientists calculated reach 435 °C for HD 260655b and 284 °C for HD 260655c. “We consider this beach to be outside the habitable zone, too warm for any water is on the surfaceby M. Kunimoto
Ideal Candidates for Atmospheric Studies
But hope is not lost for the HD 260655 system: researchers estimate that it can accommodate more than two. “There could be more planets in the system”Adds Avi Shporer, co-author of these two rocky worlds and a researcher at the Massachusetts Institute of Technology. “There are many multiplanetary systems that host five or six planets, especially around small stars like this. Hopefully we’ll find more, and we might be in the habitable zone. It’s an optimistic idea.”
They could soon be targeted bywhich will unveil its first pictures on July 12. By their proximity and the shining of their star, “Both planets in this system are among the best targets for studying the atmosphere.”, explains Mr. Kunimoto. For now, the team has decided that if they have a file they are not extensive and consist mainly of . Because they are similar in density and size to Earth, the team also hopes to learn more about their formation through them.
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