Researchers searching the galaxy for planets that could pass the litmus test of sustaining water-based life must find whether those planets fall in a habitable zone, where they could be capable of having liquid water and sustaining life. New work, led by a team of Penn State researchers, will help scientists in that search.
Using the latest data, the Penn State Department of Geosciences team has developed an updated model for determining whether discovered planets fall within a habitable zone. The work builds on a prior model by James Kasting, Evan Pugh Professor of Geosciences at Penn State, to offer a more precise calculation of where habitable zones around a star can be found.
Comparing the new estimates with the previous model, the team found that habitable zones are actually farther away from the stars than previously thought.
"This has implications for finding other planets with life on them," said post-doctoral researcher Ravi kumar Kopparapu, a lead investigator on the study, which will be published described in Astrophysical Journal.
For the paper, Kopparapu and graduate student Ramses Ramirez used updated absorption databases of greenhouse gases (HITRAN and HITEMP). The databases have more accurate information on water and carbon dioxide than previously was available and allowed the research team to build new estimates from the groundbreaking model Kasting created 20 years ago for other stars.
Using that data and super computers at Penn State and the University of Washington, the team was able to calculate habitable zones around other stars. In the previous model, water and carbon dioxide were not being absorbed as strongly, so the planets had to be closer to the star to be in the habitable zone.
The new model has already found that some extrasolar planets previously believed to be in habitable zones may, in fact, not be.
The new model could also help scientists with research that is already under way. For example, the model could be used to see if planets the NASA Kepler mission discovers are within a habitable zone. The Kepler mission has found more than 2,000 potential systems that could be investigated.
The data could assist with a Habitable Zone Planet Finder a team of scientists in Penn State's Department of Astronomy and Astrophysics is building. In 2011, that team received a National Science Foundation grant to develop an instrument to find planets in habitable zones. The precision spectrograph, which is under construction, will help scientists find Earth-sized planets in the Milky Way that could sustain liquid water.
In the future, the model could also be useful for research done with Terrestrial Planet Finder telescopes, which would guide users of the supersized telescopes on where to look.
While in the new model Earth appears to be situated at the very edge of the habitable zone, the model doesn't take into account feedback from clouds, which reflect radiation away from the earth and stabilize the climate.
Penn State: http://live.psu.edu
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
The huge eyes of the Large Binocular Telescope in Arizona are staring across vast cosmic distances in the hope of finding signs of alien life
A NASA science satellite on Friday will wrap up a 7-1/2-year journey to Ceres, an unexplored dwarf planet in the main asteroid belt between Mars and Jupiter, scientists said on Monday.
Scientists are puzzled by a new image taken by NASA's Dawn spacecraft, which found two bright spots on the dwarf planet Ceres. The spots are noticeably brighter than other parts of the surface.
Moscow assures it will continue funding the International Space Station until 2024 but will then disconnect its modules to build a national base
The first ever photograph of our planet from space marks the moment when rockets became space exploration vehicles and not just bomb carriers
(Reuters) - An unusual pink cloud that lit up the sky over New Mexico and Arizona early on Wednesday was caused by a NASA research rocket launched to study the outer reaches of Earth's atmosphere, scientists said.
CAPE CANAVERAL, Fla. (Reuters) - Two U.S. astronauts finished a 6-1/2-hour spacewalk on Wednesday to prepare parking spots for new commercial space taxis then discovered water had leaked into a spacesuit helmet, a problem that led to the near-drowning of another astronaut in 2013, officials said.
Astronomers are confounded that an object so big could have formed so soon after the Big Bang
Exceptional sensitivity might one day reveal largest structure of universe
We're getting ready to send a probe to Jupiter's icy moon – but how will we know if anything lives there?