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They have discovered two new exoplanets 16 light-years apart that are in their star’s ‘habitable’ zone



The new planet joins about ten other planets in a fairly exclusive category. A small world in the “conservative” habitable zone less than 1.5 times the size of Earth or less than 5 times its mass.

Two new Earth-mass exoplanets discovered Orbiting a red dwarf star just 16 light years away that is, astronomically very close.

planet, GJ 1002 b and c lie in the stellar habitable zone (the orbital distance at which liquid water could form on the surface of a planet). This is, if you have the right kind of vibe, Reported by NASA.

The odds of a red dwarf hosting a habitable world are the subject of scientific debate. On the downside, these stars are smaller and cooler, but have longer lifespans than stars like our Sun, so they tend to explode young and often.

these eruptions They may eject the atmospheres of planets in close orbit, and the two planets orbiting around GJ 1002 are very close together. Planet b, which has a slightly greater mass than Earth, is the closer of the two. There are only 10 days in the year as it orbits the stars. Planet c, which has about one-third the mass of Earth, takes about 20 days to orbit the star.

However, on the positive side GJ 1002 seems mature and calm It’s even possible that their past activity helped accumulate various molecules on the planet’s surface.

How did they discover two new exoplanets?

An international team led by Alejandro Suarez Mascarenho from the University of La Laguna has discovered two new planets using radial velocity measurements.

As the planet moves beyond the star, the star moves away from us and the starlight shifts towards the red end of the spectrum. When the planet moves toward the near side of the star, it pulls the star toward us, shifting its light to blue. GJ 1002’s planetary jerk is small, about 1.3 meters per second. This equates to traveling at about 4.8 kilometers per hour. These small movements are difficult to detect.

The radial velocity method, which also reveals the mass of the planet, has confirmed the detection of over 1,000 exoplanets. However, most detections were made using the ‘transit’ method. It consists of observing a star’s light dimming slightly as a planet passes in front of its star, and nearly 4,000 detections have been confirmed.

To make radial velocity measurements, the scientific team relied on an instrument called a spectrometer that measures changes in light. The spectrographs used to discover GJ 1002 b and c were part of two joint observation programs. Echelle Spectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) and High-Resolution Search of Her M Dwarf at Calar Alto with Optical Exo-Earth. Echelle Spectrometer and Near Infrared (CARMENES).

The new planet joins about ten other planets in a fairly exclusive category. A small world in the “conservative” habitable zone less than 1.5 times the size of Earth or less than 5 times its mass.

Relaxing the membership criteria slightly (slightly larger planets in the ‘optimistic’ habitable zone), the group expands to about 40 exoplanets, or planets outside the solar system. The conservative habitable zone is a tighter limit on the area around a star where a planet can hold water. The optimistic habitable zone is a bit restricted. Habitable zone estimates are approximate. At this time, the atmospheres of these worlds have not been analyzed, and many may be missing it.

Source: Biobiochile

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