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Discovery Alert: Earth-sized Planet Has a ‘Lava Hemisphere’


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Discovery Alert: Earth-sized Planet Has a ‘Lava Hemisphere’

An artist's concept illustration shows a planet large in the frame and back-lit by a nearby bright yellow star. Another planet in the system can be seen as a black dot crossing the face of the star against the background of space.
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’s also the closest discovered Earth-sized planet this young, at about 400 million years old.
NASA/Ames/JPL-Caltech/T. Pyle

The discovery: 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.

Key Facts: 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’s also the closest discovered Earth-sized planet this young, at about 400 million years old.

Details: A team of astronomers analyzed this system using data from NASA’s TESS (Transiting Exoplanet Survey Satellite), which spots “transits,” 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’s orbit, the team took the data and removed the signals of the

two known planets. This allowed them to see an additional signal – 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.

The tidally locked planet is very close to Earth size (it is approximately 1.1 times the diameter of our own planet) and it’s orbiting a star that’s similar to the size of our Sun (the star is about 0.91 the size and 0.99 the mass of the Sun).

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 “year” and extremely high temperatures on its dayside. 

Fun Facts: 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.

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.

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.

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’s dayside could be a “lava hemisphere.”

The planet’s 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’s “dark side,” and the status of its (possible) atmosphere. As this study states, “Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution.”

The Discoverers: This discovery was described in a new study, accepted for publication in the Astronomical Journal, titled “TESS 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.” 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.

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

Read the paper.

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      These two teams of amateur astronomers have collaborated with the SETI Institute to detect the transit of an object called TIC 393818343 b (aka TOI 6883 b)—proving to the world that this object does indeed contain a planet orbiting a star.  
      First, the UNISTELLAR and SETI Institute team saw a single transit signal detected by the TESS space telescope. They gathered data to predict when the planet would transit again. They then alerted the UNITE and Exoplanet Watch amateurs to help observe the host star for signs of a transiting planet during the predicted time. The observations from the two networks showed two new transit detections, confirming the predictions, and demonstrating that a planet indeed causes the signals.
      This newly discovered giant planet falls into the “warm Jupiter” category of exoplanets,  meaning it orbits closer to its host star than Jupiter, or even the Earth does. Astronomers have even predicted that it might, under certain circumstances, migrate still further inward toward its star to become a “hot Jupiter.” Hot or not, thanks to some terrific teamwork, we are now one step closer to understanding the population of planets that lies outside our own Solar System. The news is now published in the Astronomical Journal, and all the citizen scientists involved, including a high school student, are co-authors on this scientific publication, “Confirmation and Characterization of the Eccentric, Warm Jupiter TIC 393818343 b with a Network of Citizen Scientists”.
      UNITE (UNISTELLAR Network Investigating TESS Exoplanets) uses the global network of observers with UNISTELLAR telescopes to gather data on TESS exoplanet candidates and long-duration exoplanet transits. To get involved, no matter what kind of telescope you have, visit https://science.unistellar.com/exoplanets/unite/ or reach out to citizenscience@unistellaroptics.com.
      Participation is open to everyone, regardless of citizenship. “What I find amazing about the NASA citizen science project is that they involve people from all around the world contributing meaningful observation data that leads to incredible discoveries!” Sophie Saibi, a high school student from California who participated. “Researching as a citizen scientist is something I highly recommend to anyone who gazes at the night sky with awe and wonder,” said Rivett.
      Congratulations to everyone on the team! The amateur astronomers who coauthored this paper are listed below.
      Mario Billiani Robert Gagliano Martti H. Kristiansen Thomas Lee Jacobs Daryll M. LaCourse Georgios Lekkas Margaret Loose Bryan Martin Nicola Meneghelli Mark Omohundro Darren Rivett Fadi Saibi Sophie Saibi  Hans M. Schwengeler Ivan A. Terentev Daniel Zaharevitz Facebook logo @DoNASAScience @DoNASAScience Share








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      Last Updated Aug 21, 2024 Related Terms
      Astrophysics Citizen Science Exoplanets TESS (Transiting Exoplanet Survey Satellite) The Universe Explore More
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