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.
Nasa's Curiosity rover gets straight back to work after a software upgrade by drilling a new test hole.
The Google-sponsored competition to land a spacecraft on the moon has awarded "milestone prizes" to five competing teams
Zoom in on a star's vibrations and, if they're related by the golden ratio, you might see fractals, like a coastline. This could tell us about what's going on inside
Supernovae were thought to need help from a nearby star – if they don't, we may have to rethink how we measure cosmic distances as well as dark energy
An unusual spacecraft closes in on a mysterious world
Think “moon” and you probably envision a desolate, cratered landscape, maybe with an American flag and some old astronaut footprints. Earth’s moon is no place for living things. But that isn’t necessarily true for every moon. Whirling around Saturn, Enceladus spits out geysers of water from an underground ocean.
Think you've seen big rings in our own solar system? Not even close.
Boeing's first unmanned test flight is scheduled for 2016
A rare large asteroid zipped very close to Earth Monday morning. NPR's Robert Siegel talks to Paul Chodas, head of the Jet Propulsion Laboratory's Near-Earth Object program, about the "close call."
Scorched planets tightly circle an 11.2-billion-year-old star relatively close to Earth