{"id":9918,"date":"2024-01-10T18:04:30","date_gmt":"2024-01-10T22:04:30","guid":{"rendered":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/discovery-alert-earth-sized-planet-has-a-lava-hemisphere\/"},"modified":"2024-01-10T18:04:30","modified_gmt":"2024-01-10T22:04:30","slug":"discovery-alert-earth-sized-planet-has-a-lava-hemisphere","status":"publish","type":"post","link":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/discovery-alert-earth-sized-planet-has-a-lava-hemisphere\/","title":{"rendered":"Discovery Alert: Earth-sized Planet Has a \u2018Lava Hemisphere\u2019"},"content":{"rendered":"

Discovery Alert: Earth-sized Planet Has a \u2018Lava Hemisphere\u2019<\/h2>\n

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4 min read<\/p>\n

Discovery Alert: Earth-sized Planet Has a \u2018Lava Hemisphere\u2019<\/h1>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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Like Kepler-10 b, illustrated above, the exoplanet HD 63433 d is a small, rocky planet in a tight orbit of its star. HD 63433 d is the smallest confirmed exoplanet younger than 500 million years old. It\u2019s also the closest discovered Earth-sized planet this young, at about 400 million years old.<\/div>\n
NASA\/Ames\/JPL-Caltech\/T. Pyle<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n

The discovery:<\/strong> In a system with two known planets, astronomers spotted something new: a small object transiting across the Sun-sized star. This turned out to be another planet: extra hot and Earth-sized.<\/p>\n

Key Facts:<\/strong> The newly-spotted planet, called HD 63433 d, is tidally locked, meaning there is a dayside which always faces its star and a side that is constantly in darkness. This exoplanet, or planet outside of our solar system, orbits around the star HD 63433 (TOI 1726) in the HD 63433 planetary system. This scorching world is the smallest confirmed exoplanet younger than 500 million years old. It\u2019s also the closest discovered Earth-sized planet this young, at about 400 million years old.<\/p>\n

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Details:<\/strong> A team of astronomers analyzed this system using data from NASA\u2019s TESS (Transiting Exoplanet Survey Satellite), which spots \u201ctransits,\u201d or instances where planets cross in front of their star as they orbit, blocking a tiny piece of the starlight. Two planets had already been previously discovered in this planetary system, so to see what else might be lurking in the star\u2019s orbit, the team took the data and removed the signals of the <\/p>\n

two known planets. This allowed them to see an additional signal \u2013 a small transit that would reappear every 4.2 days. Upon further investigation, they were able to validate that this was actually a third, smaller planet.<\/p>\n

The tidally locked planet is very close to Earth size (it is approximately 1.1 times the diameter of our own planet) and it\u2019s orbiting a star that\u2019s similar to the size of our Sun (the star is about 0.91 the size and 0.99 the mass of the Sun).<\/p>\n

The star in this system is a G-type star, the same type as our Sun. But HD 63433 d orbits much closer to its star than we do, with a minuscule 4.2 day long \u201cyear\u201d and extremely high temperatures on its dayside.\u00a0<\/p>\n

Fun Facts:<\/strong> While this newly found planet and its star are just about the size of our own planet and Sun, HD 63433 d is quite different from our home world.<\/p>\n

Firstly, it is a very young planet in a very young system. The planetary system itself is about 10 times younger than ours and this 400-million-year-old planet is in its infancy compared to our 4.5-billion-year-old world.<\/p>\n

It is also much closer to its star than we are to ours. This planet is 8 times closer to its star than Mercury is to the Sun. Being so close to its star, this dayside of this tidally-locked planet can reach temperatures of about 2,294 Fahrenheit (1,257 Celsius). Being so hot, so close to its star, and so small, this planet likely lacks a substantial atmosphere.<\/p>\n

These scorching temperatures are comparable to lava worlds like CoRoT-7 b and Kepler-10 b, and the team behind this discovery thinks that the planet\u2019s dayside could be a \u201clava hemisphere.\u201d<\/p>\n

The planet\u2019s small size, young age, and closeness to its star make it an interesting candidate for further exploration. Follow-up study could confirm the results of this study and potentially reveal more information about the planet\u2019s \u201cdark side,\u201d and the status of its (possible) atmosphere. As this study states, \u201cYoung terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution.\u201d<\/p>\n

The Discoverers:<\/strong> This discovery was described in a new study, accepted for publication in the Astronomical Journal, titled \u201cTESS Hunt for Young and Maturing Exoplanets (THYME) XI: An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400 Myr Ursa Major Moving Group.\u201d The study, led by co-authors Benjamin Capistrant and Melinda Soares-Furtado, will be discussed in a Jan. 10 presentation at the 2024 American Astronomical Society Meeting.<\/p>\n

This study was conducted as part of the TESS Hunt for Young and Maturing Exoplanets<\/a>, which is a project focused on searching for young exoplanets that are in moving groups, stellar associations, or open clusters<\/a>. <\/p>\n

Read the paper<\/a>.<\/p>\n

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Explore More<\/h2>\n<\/div><\/div>\n
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5 min read<\/div>\n
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NASA Features New Discoveries at American Astronomical Society Meeting<\/h3>\n<\/div>\n
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NASA\u2019s Hubble Observes Exoplanet Atmosphere Changing Over 3 Years<\/h3>\n<\/div>\n
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\n\t\t\t\t\t\t\t\t\t\t6 days ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n<\/p><\/div>\n

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5 min read<\/div>\n
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Seeing and Believing: 15 Years of Exoplanet Images<\/h3>\n<\/div>\n

Fifteen years ago, astronomers delivered what is now an iconic direct image of an exoplanet,\u2026<\/p>\n

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In a system with two known planets, astronomers spotted something new: a small object transiting across the Sun-sized star. This turned out to be another planet: extra hot and Earth-sized. Continue reading → <\/span><\/a><\/p>\n

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