habitable exoplanets tagged posts

Newly discovered Carbon Monoxide-Runaway Gap can help Identify Habitable Exoplanets

Revealing Potential Habitable Planets from Atmospheric CO2, CO, and CH4 Levels

The search for habitable exoplanets involves looking for planets with similar conditions to the Earth, such as liquid water, a suitable temperature range and atmospheric conditions. One crucial factor is the planet’s position in the habitable zone, the region around a star where liquid water could potentially exist on the planet’s surface. NASA’s Kepler telescope, launched in 2009, revealed that 20–50% of visible stars may host such habitable Earth-sized rocky planets. However, the presence of liquid water alone does not guarantee a planet’s habitability. On Earth, carbon compounds such as carbon dioxide (CO2), methane (CH4), and carbon monoxide (CO) played a crucial role in shaping the climate and biogeochemistry and could have contributed to the emergence of life.

Taking this i...

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New Class of Habitable Exoplanets represent a big step forward in the Search for Life

A new class of exoplanet very different to our own, but which could support life, has been identified by astronomers, which could greatly accelerate the search for life outside our Solar System.

In the search for life elsewhere, astronomers have mostly looked for planets of a similar size, mass, temperature and atmospheric composition to Earth. However, astronomers from the University of Cambridge believe there are more promising possibilities out there.

The researchers have identified a new class of habitable planets, dubbed ‘Hycean’ planets—hot, ocean-covered planets with hydrogen-rich atmospheres—which are more numerous and observable than Earth-like planets.

The researchers say the results, reported in The Astrophysical Journal, could mean that finding biosignatures o...

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Exoplanet Climate ‘Decoder’ aids Search for Life

Globe with different suns
In this artistic rendering, different kinds of suns are shown as they interact with various Earth-like surfaces in distant solar systems. The combinations create an array of climates. Thus, in the search for exoplanets, astronomers can be guided by color for possible habitable planets.

After examining a dozen types of suns and a roster of planet surfaces, Cornell University astronomers have developed a practical model — an environmental color “decoder” — to tease out climate clues for potentially habitable exoplanets in galaxies far away.

“We looked at how different planetary surfaces in the habitable zones of distant solar systems could affect the climate on exoplanets,” said Jack Madden, who works in the lab of Lisa Kaltenegger, associate professor of astronomy and director of Cor...

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Volcanic hydrogen spurs chances of finding Exoplanet life

Volcanic hydrogen spurs chances of finding exoplanet life

Ramses M. Ramirez and Lisa Kaltenegger. A Volcanic Hydrogen Habitable Zone. Astrophysical Journal Letters, February 2017 DOI: 10.3847/2041-8213/aa60c8

Hunting for habitable exoplanets now may be easier: Cornell University astronomers report that hydrogen pouring from volcanic sources on planets throughout the universe could improve the chances of locating life in the cosmos. Planets located great distances from stars freeze over. “On frozen planets, any potential life would be buried under layers of ice, which would make it really hard to spot with telescopes,” said Ramses Ramirez, Cornell’s Carl Sagan Institute. “But if the surface is warm enough – thanks to volcanic hydrogen and atmospheric warming – you could have life on the surface, generating a slew of detectable signatures.”

Combini...

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