Compact Super-Earth System Found Around Lacaille 9352

Compact Super-Earth system found around Lacaille 9352

Compact Super-Earth system found around Lacaille 9352. A team of astronomers from the Reddots project discovered two super-Earths and a candidate planet, orbiting the nearby 4.57 billion-year-old red dwarf star Lacelle 9352. An artist's impression is a multicultural system of super-Earths orbiting the nearby red dwarf star Lacelle 9352.

At a distance of 10.7 light years, Lacelle 9352 is the twelfth closest star system to the Sun. Also known as Glisee 887, GJ887, and HD217987, this red dwarf is found in the southern constellations of piscine austinus. The star is cloudier and is about half the size of our Sun, which means that the habitable zone is closer to Lacal 9352 than the distance from Earth to the Sun.

LACAL 9352 was monitored by astronomer Sandra Jeffers of the University of Göttingen and her colleagues from the Reddots team using the HARPS (Radial High-Speed ​​Planet Search) spectrograph at ESO's 3.6-meter La Lila telescope. We use a technique known as the Doppler Wobble, which allows us to measure the front and back of the star due to the gravitational pull of the planets, he explained.

By monitoring Lacaille 9352, they detected periodic signals, indicating the presence of two planetary orbits with periods of 9.3 and 21.8 days. The planets called Lacaille 9352b (Gliese 887b) and Lacaille 9352c (Gliese 887c) have minimum numbers of 4.2 and 7.6 land masses, respectively. Both planets are internal, but they are close to the inner edge of the liquid water habitable zone.

They have surface temperatures of 195 ° C (383 ° F) and 79 ° C (174 ° F), respectively. Dr. Jeffers and co-authors also detected an unconfirmed signal with a 50-day period, which may correspond to a third super Earth, Lacral 9352d (Glisee 887d) in a warmer orbit. "We discovered two interesting facts about Lacelle 9352, which is good news not only for newly discovered planets, but also for astronomers."

The first is that the red dwarf has very few stars unlike our Sun. If Laclélé 9352 were active as our Sun, a strong wind, the output material that could destroy a planet's atmosphere, would likely just sweep the atmosphere away..planetary. This means that newly discovered planets can maintain their atmosphere, or have atmospheres thicker than Earth, and potentially harbor life, even though Lacalle 9352 receives more light than Earth.

Another interesting feature that we discovered is that the brightness of the Lacquel 9352 is almost constant. Therefore, it would be relatively easy to detect the atmosphere of a super-Earth system, an important target for Hubble's successor, the James Webb Space Telescope. This discovery is described in an article in the journal Science.

Super-Earth 55 Canary E can have a thick

Super-Earth 55 Canary E can have a thick, earth-like atmosphere. According to a study by NASA's Jet Propulsion Laboratory (JPL), researchers at Caltech and the University, a hot, rocky exoplanet called 55 Canary has an atmosphere thicker than Earth, similar to Earth's atmosphere. . California, Berkeley.

This artist's notion revolves around the Super-Earth 55 Canary E, like the star Sun 55 Cancri A. Image credit: NASA / JPL-Caltech. 55 Cancri E, one of the five planets, orbiting the Sun as 55 Cancri A, which is 60 light-years away, is still visible to the naked eye in the constellation Cancer.

Discovered in 2004, the planet is twice the radius and is 8 times larger, making it a super Earth. 55 Canary E orbits its host star at a distance of 0.015 AU, approximately 25 times that of Mercury in our Sun, every 18 hours. The planet is also blocked by lobster, which means that it does not rotate like Earth, but is a permanent side of a day and a side of "night".

According to a 2016 study using data from NASA's Spitzer Space Telescope, astronomers predicted that lava would flow freely into the lakes toward the planetarium and harden in permanent darkness. Daytime lava will reflect radiation from the original star, contributing to the planet's overall observation temperature.

Now, in-depth analysis of similar data from Canary Spitzer 55 e is likely to have an atmosphere whose content may be similar to Earth's atmosphere, but thicker. Lava going directly into space without atmosphere will create localized hot spots at high temperatures, so they are not the best explanation for Spirit Hunter condensation.

"If there is lava on this planet, it has to cover the entire surface. But the lava will be hidden from our view by the thick atmosphere," JPL / Caltech Astronomer Dr. Renu Hu said. How will energy flow throughout the planet and will radiate back to space, JPL and Dr. from the University of California, Berkeley Isabel Angelo and Drs The use of the improved model by Isabel Angelo suggests that the night side of the planet is not as calm as before.

The still cold side of 55 Canary E is still significantly above Earth standards, averaging 2,400 to 2,600 ° F (1,300 to 1,400 ° C), and the warm side averaging 4,200 ° F (2,300 ° C). If the atmosphere is not there, the difference between the cold and hot sides should be more extreme.

Scientists are debating whether the planet has an atmosphere like Earth and Venus, or just a rocky core and has no atmosphere, like Mercury. The case for an environment is now stronger than before, said Dr. Hu. "The atmosphere of this mysterious planet can contain nitrogen, water and even oxygen, molecules that are also found in our atmosphere.

But with much higher temperatures," the authors said. "The density of the planet is also similar to that of Earth, suggesting that it is also rocky." However, the intense heat emanating from the host star will be too large to support life and cannot retain liquid water.

The findings will be published in the Astronomical Journal.