24/7 Space News
Discovery Alert: Earth-sized Planet Has a 'Lava Hemisphere'
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.
Discovery Alert: Earth-sized Planet Has a 'Lava Hemisphere'
by Staff Writers for NASA News
Washington DC (SPX) Jan 11, 2024

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.

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."

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.

Research Report:TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana-Horologium Association

Related Links
Exoplanet Exploration at NASA
Lands Beyond Beyond - extra solar planets - news and science
Life Beyond Earth

Subscribe Free To Our Daily Newsletters

The following news reports may link to other Space Media Network websites.
WASP-69b has comet-like tail that's very long
Maunakea HI (SPX) Jan 10, 2024
New data from W. M. Keck Observatory on Maunakea, Hawai?i Island confirms exoplanet WASP-69b, known for its escaping atmosphere, is forming a comet-like tail that is even longer than previously observed. Named WASP-69b, scientists have studied this Jupiter-sized planet in the past, focusing on its escaping atmosphere and observing only a small trail of helium gas. But during a press conference today at the January 2024 Meeting of the American Astronomical Society, a University of California, Los A ... read more

Turkey's first astronaut brandishes Erdogan's ambitions

Ax-3: A Step Forward in Long-Duration Space Missions with Advanced Tech Experiments

Revolutionizing Space Habitats: Aurelia Institute's TESSERAE for Biotech Studies

Starliner parachute system upgrade tested before crewed flight

SpaceX completes second launch Sunday, sends more satellites into orbit

China's Gravity 1 sets record for solid rocket fuels in maiden launch

Mexico Set for Space Sector Boost with New National Rocket and Space Center by Merida Aerospace

Rocket maker working on medium-lift model

Water may have flowed through Martian Valleys countless times

Sols 4066-4070: Cracking Up

IDEFIX Rover Set to Embark on Pioneering Journey to Martian Moon Phobos

Potential solvents identified for building on Moon and Mars

Tianxing 1B satellite launched by Kuaizhou 1A to conduct space environment survey

China Prepares to Launch Tianzhou 7 Cargo Ship to Tiangong Space Station

Tianzhou 6 cargo spacecraft to return to Earth

Tianzhou 7 mission set to enhance operations at China's Tiangong Space Station

MEASAT Partners with SpaceX as Official Reseller for Starlink Services in Key Markets

Momentus secures $4M through direct stock offering to institutional investor

Sidus Space Partners with ASPINA for Satellite Technology Demonstration on LizzieSat Mission

Iridium announces Project Stardust for Global, Standards-Based IoT Connectivity

Spire Global sets to revolutionize space traffic management with Northstar's SSA satellites

US, UK strikes targeted Huthi radar, missile capabilities: defense chief

D-Orbit Secures Record euro 100m in Series C Funding, Advancing Space Logistics and In-Orbit Services

Epic says Apple court fight is 'lost'

Unlocking the secrets of a "hot Saturn" and its spotted star

Astronomers make rare exoplanet discovery

Old stars may be the best places to search for life, new study suggests

Study uncovers potential origins of life in ancient hot springs

New images reveal what Neptune and Uranus really look like

Researchers reveal true colors of Neptune, Uranus

The PI's Perspective: The Long Game

Webb rings in the holidays with the ringed planet Uranus

Subscribe Free To Our Daily Newsletters


The content herein, unless otherwise known to be public domain, are Copyright 1995-2023 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.