Featured Research

from universities, journals, and other organizations

New observations of the giant planet orbiting beta Pictoris

Date:
March 3, 2011
Source:
Astronomy & Astrophysics
Summary:
New observations have been made of the giant planet around beta Pictoris. Discovered in 2009, this planet, called beta Pictoris b, has now been detected again with the NaCo instrument on the VLT. Astronomers find that the planet is moving around the star. They have also measured the mass and the effective temperature of beta Pic b.

Multi-epoch observations of the β Pictoris b exoplanet. The planet was imaged in 2003 (left image) in the L' band (3.8 μm) in the plane of the circumstellar disk surrounding the star (not seen here). It was detected again in October 2009 (middle) when it had moved to the other side of the star. The new observations made in March 2010 at 2.18 μm, which are now published in A&A, are shown in the right panel. The planet has moved yet again relative to its position measured in 2009.
Credit: Image courtesy of Astronomy & Astrophysics

Astronomy & Astrophysics publishes new high angular resolution observations of the giant planet orbiting the star β Pictoris. Located at 63.4 light-years from the Sun, β Pic is a very young star of about 12 million years old [1], which is 75% more massive than our Sun. β Pic is well known for harboring an extended and structured circumstellar disk. It was actually the first star to have its disk directly imaged more than 25 years ago. In 2009, a giant planet was seen orbiting within the disk. With an orbital distance of 8 to 15 astronomical units (AU), β Pictoris b is the closest exoplanet to its star that has ever been imaged. This planet offers a new opportunity to study the planetary formation processes, in particular the interactions between the planets and their native disks.

An international team of astronomers [2] observed the β Pic system, using the VLT/NaCo instrument at 2.18 μm, previous observations having been made near 4 μm. They detected the planet again and compared these new observations with the previous ones. Combining all the data together shows that the planet is moving around the star, as expected from the previous data. Analyzing these new observations, the team was then able to measure the mass of the planet, around 7 to 11 times the mass of Jupiter, and its effective temperature, between 1100 and 1700C [3].

These new data already tell us something about the formation of the planet, especially because the system is very young. The planet β Pic b is still warm, implying that it has retained most of the primordial heat acquired during its formation. If it has been formed in a similar way to the giant planets of our solar system [4], its mass and temperature cannot be explained by some evolutionary models that hypothesize a total release of the energy acquired during the accretion of disk materials.

Forthcoming observations of β Pictoris b with NaCo and also with the next generation VLT instrument SPHERE should soon provide more details about its atmosphere and orbital properties and about the way this companion influences the surrounding disk material.

[1] The β Pictoris system is much younger than our solar system formed 4.5 billion years ago.

[2] The team of astronomers includes M. Bonnefoy, A.-M. Lagrange, G. Chauvin, D. Ehrenreich, D. Mouillet (IPAG, Grenoble, France), A. Boccaletti, D. Rouan, D. Gratadour (LESIA-Observatoire de Paris, Meudon, France), D. Apai (Space Telescope Institute, Baltimore, USA), F. Allard (CRAL-ENS, Lyon, France), J.H.V Girard (ESO, Santiago, Chile), M. Kasper (ESO, Garching, Germany).

[3] The effective temperature of a planet is the surface temperature it would have if it radiated as a "black body," that is, if it absorbed all the radiation coming from its star and re-emitted all back into space. For example, Earth's effective temperature is about -18C, while its actual surface temperature is 14C on average.

[4] The giant planets of our solar system (Jupiter, Saturn, Uranus, and Neptune) were most likely formed inside the circumstellar disk surrounding the Sun from embryos of solid material (ice, silicates) that swallowed surrounding gases from the disk.


Story Source:

The above story is based on materials provided by Astronomy & Astrophysics. Note: Materials may be edited for content and length.


Journal Reference:

  1. M. Bonnefoy, A.-M. Lagrange, A. Boccaletti, G. Chauvin, D. Apai, F. Allard, D. Ehrenreich, J. H. V. Girard, D. Mouillet, D. Rouan, D. Gratadour, M. Kasper. High angular resolution detection of Beta Pictoris b at 2.18 microns. Astronomy & Astrophysics, 2011; DOI: 10.1051/0004-6361/201016224

Cite This Page:

Astronomy & Astrophysics. "New observations of the giant planet orbiting beta Pictoris." ScienceDaily. ScienceDaily, 3 March 2011. <www.sciencedaily.com/releases/2011/03/110303111417.htm>.
Astronomy & Astrophysics. (2011, March 3). New observations of the giant planet orbiting beta Pictoris. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2011/03/110303111417.htm
Astronomy & Astrophysics. "New observations of the giant planet orbiting beta Pictoris." ScienceDaily. www.sciencedaily.com/releases/2011/03/110303111417.htm (accessed July 25, 2014).

Share This




More Space & Time News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: ISS Cargo Ship Launches in Kazakhstan

Raw: ISS Cargo Ship Launches in Kazakhstan

AP (July 23, 2014) The Progress 56 cargo ship launched from the Baikonur Cosmodrome in Kazakhstan Wednesday. NASA says it will deliver cargo and crew supplies to the International Space Station. (July 23) Video provided by AP
Powered by NewsLook.com
Raw: Cargo Craft Undocks from Space Station

Raw: Cargo Craft Undocks from Space Station

AP (July 22, 2014) A Russian Soyuz cargo-carrying spacecraft undocked from the International Space Station on Monday. The craft is due to undergo about ten days of engineering tests before it burns up in the Earth's atmosphere. (July 22) Video provided by AP
Powered by NewsLook.com
NASA Ceremony Honors Moon Walker Neil Armstrong

NASA Ceremony Honors Moon Walker Neil Armstrong

AP (July 21, 2014) NASA honored one of its most famous astronauts Monday by renaming a historic building at the Kennedy Space Center in Florida. It now bears the name of Neil Armstrong, the first man to walk on the moon. (July 21) Video provided by AP
Powered by NewsLook.com
Neil Armstrong's Post-Apollo 11 Life

Neil Armstrong's Post-Apollo 11 Life

Newsy (July 19, 2014) Neil Armstrong gained international fame after becoming the first man to walk on the moon in 1969. But what was his life like after the historic trip? Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

    Health News

      Environment News

        Technology News



          Save/Print:
          Share:

          Free Subscriptions


          Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

          Get Social & Mobile


          Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

          Have Feedback?


          Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
          Mobile: iPhone Android Web
          Follow: Facebook Twitter Google+
          Subscribe: RSS Feeds Email Newsletters
          Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins