News / Science & Technology

New Exoplanet Spotted with Earth-based Telescope

Glowing a dark magenta, the newly discovered exoplanet GJ 504b weighs in with about four times Jupiter's mass, making it the lowest-mass planet ever directly imaged around a star like the sun. Image Credit: S. Wiessinger
Glowing a dark magenta, the newly discovered exoplanet GJ 504b weighs in with about four times Jupiter's mass, making it the lowest-mass planet ever directly imaged around a star like the sun. Image Credit: S. Wiessinger

Related Articles

Volunteer Astronomers Find 15 New Exoplanets

Amateur astronomers say 15 objects circling distant stars may be capable of supporting life

New Method of Finding Planets Scores First Discovery

Newly-discovered planet was detected using a method that relies on physicist Albert Einstein's special theory of relativity

Exoplanet Could Change Theory on How Planets Form

Potential planet is estimated to be six to 28 times the mass of Earth
VOA News
Astronomers have discovered a new exoplanet orbiting a sun-like star 57 light years away. The exoplanet is four times the size of Jupiter and can actually be seen by Earth-based telescopes.

The planet, named GJ 504b, is the lowest mass exoplanet ever to be detected using direct, or visible, imaging techniques. Most exoplanets – planets outside our solar system -- are discovered using indirect methods in which the exoplanet’s existence is inferred, but not actually seen.

GJ 504b’s sun is slightly hotter than our sun and is visible to the naked eye in the constellation Virgo. The planet was spotted by the Subaru Telescope in Hawaii.

"If we could travel to this giant planet, we would see a world still glowing from the heat of its formation with a color reminiscent of a dark cherry blossom, a dull magenta," said Michael McElwain, a member of the discovery team at NASA's Goddard Space Flight Center in Greenbelt, Md. in a statement. "Our near-infrared camera reveals that its color is much more blue than other imaged planets, which may indicate that its atmosphere has fewer clouds."

Direct imaging is the most challenging method to spot exoplanets, explained Masayuki Kuzuhara at the Tokyo Institute of Technology, who led the discovery team.

"Imaging provides information about the planet’s luminosity, temperature, atmosphere and orbit, but because planets are so faint and so close to their host stars, it's like trying to take a picture of a firefly near a searchlight," he said.

However, since the GJ504 star system is relatively young – an estimated 160 million years old – that GJ 504b has not had long enough to lose the heat of its formation, which enhances infrared brightness.

This composite combines Subaru images of GJ 504 using two near-infrared wavelengths (orange, 1.6 micrometers, taken in May 2011; blue, 1.2 micrometers, April 2012). Once processed to remove scattered starlight, the images reveal the orbiting planet, GJ 50This composite combines Subaru images of GJ 504 using two near-infrared wavelengths (orange, 1.6 micrometers, taken in May 2011; blue, 1.2 micrometers, April 2012). Once processed to remove scattered starlight, the images reveal the orbiting planet, GJ 50
x
This composite combines Subaru images of GJ 504 using two near-infrared wavelengths (orange, 1.6 micrometers, taken in May 2011; blue, 1.2 micrometers, April 2012). Once processed to remove scattered starlight, the images reveal the orbiting planet, GJ 50
This composite combines Subaru images of GJ 504 using two near-infrared wavelengths (orange, 1.6 micrometers, taken in May 2011; blue, 1.2 micrometers, April 2012). Once processed to remove scattered starlight, the images reveal the orbiting planet, GJ 50
"Our sun is about halfway through its energy-producing life, but GJ504 is only one-thirtieth its age," added McElwain. "Studying these systems is a little like seeing our own planetary system in its youth."

Additionally, GJ 504b orbits its star at roughly nine times the distance Jupiter orbits the sun, which challenges the most widely held theory about how planets form.  That theory poses that planets similar to Jupiter form from in inside gas-rich debris disks that surround young stars. Collisions among asteroids and comets create a core, and when the mass of the core gets large enough, its gravity attracts gas and debris from the disk.

The model works for planets as far away from our sun as Neptune, but for GJ 504b, which is so far away from its star, the model becomes “problematic.”

"This is among the hardest planets to explain in a traditional planet-formation framework," explained team member Markus Janson, a Hubble post-doctoral fellow at Princeton University in New Jersey. "Its discovery implies that we need to seriously consider alternative formation theories, or perhaps to reassess some of the basic assumptions in the core-accretion theory."

A paper describing the results has been accepted for publication in The Astrophysical Journal and will appear in a future issue.

You May Like

Video Miami Cubans Divided on New US Policy

While older, more conservative Cuban Americans have promoted anti-Castro political movement for years, younger generations say economically, it is time for change More

2014 Sees Dramatic Uptick in Boko Haram Abductions

Militants suspected in latest mass kidnapping of over 100 people in Gumsuri, Nigeria on Sunday More

Video Cuba Deal Is Major Victory for Pope

Role of Francis hailed throughout US, Latin America - though some Cuban-American Catholics have mixed feelings More

This forum has been closed.
Comments
     
There are no comments in this forum. Be first and add one

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Sudan School Becomes Target of Aerial Attacksi
X
December 19, 2014 12:45 AM
The school dropout rate is at an all-time high in Sudan's South Kordofan state because many schools have been destroyed during the three-year civil war between the government and SPLA-N rebel forces. Adam Bailes visited Sudan's Nuba Mountains' region and reports many children are simply too scared to go to school
Video

Video Sudan School Becomes Target of Aerial Attacks

The school dropout rate is at an all-time high in Sudan's South Kordofan state because many schools have been destroyed during the three-year civil war between the government and SPLA-N rebel forces. Adam Bailes visited Sudan's Nuba Mountains' region and reports many children are simply too scared to go to school
Video

Video VOA Reporter Tours Devastated Peshawar School

Islamist militants wearing military uniforms and strapped with explosives attacked a military run school Tuesday in the northwestern Pakistani city of Peshawar. At least 141 people were killed in the horrific attack, most of them young students. VOA reporter Ayaz Gul visited the devastated school and attended the funeral of the principal who courageously tried to save her students from the deadly attack.
Video

Video Nigerians Fleeing Boko Haram Languish in Camp Near Capital

In its five-year effort to impose Islamic law in northeastern Nigeria, the Boko Haram extremist group has killed thousands of people and forced hundreds of thousands to flee. Some of those who ran for their lives now live in squalor on the edges of the capital, Abuja. Chris Stein reports for VOA.
Video

Video Putin Says Russian Economy Will Emerge Stronger

Russian President Vladimir Putin has said his country's sinking economy will not only recover but also become stronger, despite falling oil prices and Western sanctions over Ukraine. VOA's Daniel Schearf reports.
Video

Video Detained Turkish Journalists Follow Teachings of US-Based Preacher

The Turkish government’s jailing of critical journalists has sparked international condemnation and is being seen as an effort to undermine the followers of an ailing Turkish preacher based in the United States. VOA religion reporter Jerome Socolovsky has more.
Video

Video ‘Anti-Islamization’ Marches Increase Tensions In Germany

Anti-immigrant rallies in Germany have been building in recent weeks, peaking Monday night in the city of Dresden where tens of thousands of people turned out to demonstrate against what they call the ‘Islamization’ of the West. Germany has offered asylum to more Syrian refugees than any other country, and this appears to have set off the protests. Henry Ridgwell reports from London.
Video

Video Aceh Rebuilt Decade After Tsunami, But Scars Remain

On December 26, 2004 there was an earthquake in the Indian Ocean so powerful it caused the Earth’s axis to wobble a few centimeters. Onshore on the island of Sumatra, the resulting tsunami was devastating. A decade later, VOA Correspondent Steve Herman reports from Banda Aceh, Indonesia, where although there is little remaining evidence of the physical devastation, the psychological scars among survivors remain.
Video

Video Refugees Living in Kenya Long for Peace in the Home Countries

Kenya is host to numerous refugees seeking safe haven from conflict. Immigrants from Somalia face challenges in their new lives in Kenya. Ahead of International Migrants Day (December 18) Lenny Ruvaga has more for VOA News from the Kenyan capital.

All About America

AppleAndroid