2023-11-22 13:24:14
LTT 1445Ac, which was originally just one of thousands of exoplanets, has now been confirmed by the Hubble Space Telescope to be regarding the same size as Earth, making it a rare terrestrial planet known to be 22 light-years away. LTT 1445 is a “three-star system” composed of three red dwarf stars LTT 1445 A, LTT 1445 B, and LTT 1445 C (the latter two orbit each other), 22.3 light-years away from the sun. Advertisement (Please continue reading this article) Among them, the main star LTT 1445 A is known to have 2 exoplanets: LTT 1445Ab was discovered in 2019 with an orbital period of 5.36 days; LTT 1445Ac was discovered by the Transiting Exoplanet Survey Satellite (TESS) in 2022. The orbital period is 3.12 days. In recent years, the discovery of exoplanets has turned from a shocking event to a routine matter. LTT 1445Ac was originally just one of thousands of exoplanets. The only problem is that the optical resolution of the TESS satellite is not high enough. When viewed from the earth, LTT 1445Ac cannot be determined. The orbital plane relative to the geometry of its star means that this detection produces an inaccurate lower limit of the planet’s diameter. It is unknown how large LTT 1445Ac is exactly. So scientists turned to the Hubble Space Telescope with higher resolution for help. From this measurement, they were surprised to learn that LTT 1445Ac has a mass of regarding 1.37 times the Earth and a radius only 1.07 times the Earth. This means that the planet is a rocky world like the Earth, and its surface gravity is roughly the same. Advertisement (Please continue reading this article) Unfortunately, the surface temperature of LTT 1445Ac is as high as 260 ℃, which is basically not conducive to the survival of known life. But in the future, astronomers can use the James Webb Space Telescope to analyze the atmospheric characteristics of LTT 1445Ac. The new paper will be published in the Astronomical Journal. (Source of the first picture: NASA) Join the official LINE account of “Science and Technology News” immediately to master all-round new knowledge of the technology industry at one hand!
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