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New American studies reveal the mystery of a terrestrial planet

via:博客园     time:2019/8/25 17:08:28     readed:106

Xinhua News Agency, Beijing, August 25 (Reuters) - A team in the United States recently reported that they used NASA's Spitzer Space Telescope to observe data, "look at" the geomorphological features of an extrasolar planet. This rocky planet about 50 light-years is 1.3 times larger than Earth, with almost no atmosphere, and the surface is covered by cooling volcanic lava similar to the Moon Moon Sea.

Institutional researchers such as NASA introduced the rocky planet LHS 3844b in a new issue of Nature. It revolves around its parent star —— an M-type dwarf movement that turns around the parent star every 11 hours. Because it is closer to the parent star, it is likely to be in the “tidal lock” state, always facing the parent star in the same way, which makes it to a smooth surface temperature of 770 degrees Celsius.

By measuring the temperature difference between the LHS 3844b and the back surface, the researchers found that the amount of heat transferred from the light surface to the back surface was negligible, indicating that there is almost no atmosphere on the surface.

If the surface of the planet covers the atmosphere, the hot air to the smooth surface will expand, and the resulting wind will transfer heat to the back surface. “The temperature difference between the two sides of the planet is the maximum possible,” said Laura ·, the first author of the paper and a researcher at the Harvard-Smithsonian Center for Astrophysics. “Kreidberg explained,” We have no atmosphere & ldquo; bare rock & rsquo; model very well matched. ”

Studying the conditions of planetary atmospheric formation is critical to finding extraterrestrial life. Kreiderberg said that although many theories about how the formation of the planetary atmosphere in the M-type dwarf galaxies have been proposed, LHS 3844b is the first rocky planet that has been observed outside the solar system and has no atmosphere.

The researchers also used LHS 3844b's surface reflectivity to speculate on its composition, arguing that its surface was covered by basalt, and the color was "quite dark". Basalt is a kind of volcanic rock and the most important component of the Moon Moon Sea. Therefore, the researchers speculated that LHS 3844b had a volcanic eruption like the Moon Moon Sea in ancient times.

LHS 3844b was first discovered in 2018 by the NASA Outer Planetary Detector & Tess & Ts. "Tess" is called the new exoplanet probe launched by NASA last April. “Spitzer” Space Telescope is a large infrared telescope launched by NASA in 2003 and is expected to end its mission in January 2020.

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