Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UCF, UCLA astronomers first to measure night and day on extrasolar planet

16.10.2006
Observations hold promise for future studies of other extrasolar planets

University of Central Florida Astronomy professor Joseph Harrington and University of California at Los Angeles professor Brad M. Hansen and their team have made the first direct observation of distinct day and night temperatures on a planet orbiting another star.

Their published work appears in this week's Science Express, the online version of Science Magazine. The announcement was made today in Pasadena, Calif., at the annual meeting of the Division for Planetary Sciences of the American Astronomical Society. UCF will host the meeting in Orlando next year. The DPS includes 1,282 planetary scientists and astronomers, including 232 non-U.S. members.

The team used NASA's Spitzer Space Telescope to measure the infrared light emitted by the planet upsilon Andromedae b at five points around its orbit. The planet orbits a star located 263 trillion miles from Earth in the constellation Andromeda.

At each point during the observations, different portions of the planet's day and night hemispheres were in view, creating a rise-and-fall pattern in the light level that was synchronized with the planet's known orbit.

This information helps planetary scientists choose among several competing hypotheses regarding weather on so-called "hot Jupiter" planets, which orbit very close to their stars. Temperatures on these planets are about 3,000 degrees Fahrenheit, Harrington and Hansen calculated. Hot Jupiters have small enough orbits that the energy they absorb and reradiate from their host stars dominates their own internal energy losses.

"How they absorb and reradiate this energy is fundamental to understanding the behavior of their atmospheres," Harrington and Hansen said in their published article. "Studying planetary atmospheres under such exotic conditions puts terrestrial and solar-system meteorology into a universal context, which aids in our understanding of weather on all planets," Harrington added.

A number of models predict that strong winds transport energy from the day side to the night side. "But, our points are almost exactly synced up with the known orbit, which indicates almost immediate reradiation of energy, very little energy transport," Harrington said. "That's new, and very exciting. The temperature difference between day and night is also very strong, which is more evidence for immediate reradiation."

Why don't the models work for upsilon Andromedae b? "That's going to be a hot topic now," Harrington said.

Since the first planet orbiting another sun-like star was discovered in 1995, more than 200 such planets have been found, but scientists still cannot see the planets as separate images from their stars.

"In the past, we could only directly measure planets that happened to pass in front of and behind their stars from our point of view," Harrington said. "That only works for certain planets, and only at two points in the orbit. Our new method doesn't have those limitations, which opens up opportunities to observe more planets, and to get data all around their orbits. We need that to learn how their atmospheres work."

So when will someone discover an Earth-like planet around a sun-like star with a temperature that could support life as we know it? "It may not be that long of a wait," Harrington said. "NASA's Kepler mission should find several such planets, but technology is moving so fast, it could be that someone else does it first." The unmanned Kepler mission is scheduled for launch in October 2008.

Zenaida Gonzalez Kotala | EurekAlert!
Further information:
http://www.ucf.edu

More articles from Physics and Astronomy:

nachricht SF State astronomer searches for signs of life on Wolf 1061 exoplanet
20.01.2017 | San Francisco State University

nachricht Molecule flash mob
19.01.2017 | Technische Universität Wien

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>