{"id":840818,"date":"2026-08-03T00:35:08","date_gmt":"2026-08-03T00:35:08","guid":{"rendered":"https:\/\/www.newsbeep.com\/au\/840818\/"},"modified":"2026-08-03T00:35:08","modified_gmt":"2026-08-03T00:35:08","slug":"jwst-captures-stunning-images-of-one-of-the-lightest-known-exoplanets","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/au\/840818\/","title":{"rendered":"JWST captures stunning images of one of the lightest known exoplanets"},"content":{"rendered":"

Astronomers discovered Beta Pictoris d, a gas giant about 2.4 times Jupiter\u2019s mass, after spotting it in VLT data and tracing it through 11 years of archived observations.The planet is roughly 100 times fainter than Beta Pictoris b<\/a>, making it one of the lightest and faintest exoplanets ever directly imaged from the ground.Its mass and orbit may explain features in the system\u2019s debris disc, while the discovery shows that other hidden planets could be found by reanalyzing old telescope data.<\/p>\n

\u201cThere\u2019s something else there, did you see it?\u201d<\/p>\n

That question redirected an effort to study a known planet around Beta Pictoris. Instead, astronomers found a third world hiding in old observations.<\/p>\n

The newly identified planet, Beta Pictoris d, is about 100 times fainter than Beta Pictoris b. It ranks among the lightest exoplanets ever directly imaged from the ground.<\/p>\n

Its first clear ground-based detection came from the European Southern Observatory\u2019s Very Large Telescope, or VLT. Astronomers later found the planet in archived images stretching back 11 years.<\/p>\n

\u201cWe initially wanted to look more at a known planet in the system, Beta Pictoris b, to see how it changed over time.\u201d<\/p>\n

Sutlieff co-led the study with Markus Bonse, an ESO astronomer in Germany. <\/p>\n

Gallery of images for the epochs at which \u03b2 Pic d is detected (source indicated with a white arrow). (CREDIT: The Astrophysical Journal Letters) A Planet Lost in the Glare<\/p>\n

Beta Pictoris lies 63 light-years from Earth.<\/p>\n

Astronomers had already identified two giant planets around the star. Beta Pictoris b and Beta Pictoris c each have about 10 times Jupiter\u2019s mass<\/a>.<\/p>\n

The new planet is much lighter. Researchers estimate Beta Pictoris d has about 2.4 times Jupiter\u2019s mass. Like the system\u2019s other planets, it is a gas giant.<\/p>\n

Its orbit reaches farther from the star than those of planets b and c.<\/p>\n

The greater distance did not make it easy to find. Beta Pictoris d is relatively cold and extremely faint beside its host star. It is also much dimmer than Beta Pictoris b. Direct imaging captures a planet\u2019s own light, much like taking a photograph.<\/p>\n

That method works only when astronomers can separate the planet<\/a> from the overwhelming brightness of its star.<\/p>\n

\u201cThe new planet is 100 times fainter than Beta Pictoris b, the famous planet in the same system,\u201d Bonse said.<\/p>\n

He described it as the faintest exoplanet directly imaged from Earth when measured by absolute magnitude.<\/p>\n

That distinction corrects for the system\u2019s distance. It reflects the planet\u2019s size and temperature, not simply how faint it appears from Earth.<\/p>\n

PSF-subtracted images obtained with annular PCA on the original 2014 VLT\/SPHERE datacube (left column) and the cube resulting from the subtraction of our best estimate of \u03b2 Pic b (right column), shown for 10, 20, and 40 principal components. (CREDIT: The Astrophysical Journal Letters) One Detection Opens an Archive<\/p>\n

Sutlieff, Bonse and their colleagues first clearly detected the planet with ERIS, an instrument on the VLT.<\/p>\n

The team then needed to confirm that the faint object was real.<\/p>\n

Astronomers usually make follow-up observations after a possible detection. Beta Pictoris offered another route because telescopes had watched the system for years.<\/p>\n

The researchers searched ESO\u2019s archive for older observations.<\/p>\n

\u201cTo our joy, out it popped in previous SPHERE observations,\u201d said Jayne Birkby of the University of Oxford<\/a>.<\/p>\n

SPHERE is another VLT instrument that had previously observed the system. The planet appeared in several images, including one taken 11 years earlier. In that observation, it barely separated from the glare of Beta Pictoris b.<\/p>\n

\u201cPlanet d, it seems, has been playing a game of hide-and-seek with us for over a decade,\u201d Birkby said.<\/p>\n

\u201cOnly now can we say \u2018found you!\u2019\u201d<\/p>\n

The discovery turned earlier images into a record of the planet\u2019s movement. Once astronomers knew where to look, a signal that had seemed insignificant became recognizable.<\/p>\n

\u201cIt turns out it was hiding in the data all along!\u201d Birkby said.<\/p>\n

This series of images shows observations of the exoplanet Beta Pictoris d over more than a decade. (CREDIT: ESO) Space and Ground Telescopes Converge<\/p>\n

A separate team also found Beta Pictoris d with the James Webb Space Telescope.<\/p>\n

Aidan Gibbs of the University of California led that independent effort. The space telescope\u2019s NIRCam instrument had recorded the planet in archived observations. Together, the detections connected several instruments across Earth<\/a> and space.<\/p>\n

The VLT supplied the first clear ground-based identification through ERIS. Earlier SPHERE data extended the planet\u2019s history.<\/p>\n

JWST provided an independent discovery and another archival confirmation.<\/p>\n

This overlap strengthened the case that the object belonged to the Beta Pictoris system. It also highlighted the scientific value of old observations.<\/p>\n

\u201cThe detections in the archival SPHERE data<\/a> are not only very exciting on their own,\u201d said Valentin Christiaens.<\/p>\n

\u201cThey suggest a number of treasures are still hidden in the archives of VLT instruments!\u201d<\/p>\n

Christiaens is a researcher at CEA Paris-Saclay in France and a co-author of the study.<\/p>\n

The astrometry of \u03b2 Pic d relative to its host star at each epoch (circles) compared to its expected position if the candidate were a stationary background source (corresponding crosses). (CREDIT: The Astrophysical Journal Letters) A Rare Family Portrait<\/p>\n

Beta Pictoris now joins a very small group.<\/p>\n

It is only the second planetary system with more than two directly imaged exoplanets<\/a>. The first was HR 8799.<\/p>\n

\u201cSystems with multiple directly imaged exoplanets are the \u2018holy grails\u2019 of discoveries,\u201d Sutlieff said.<\/p>\n

\u201cThey can teach us a lot about what different exoplanets are like in the same formation environment.\u201d<\/p>\n

That shared environment gives astronomers a natural comparison. The planets formed around the same star and within the same broad system. Yet they differ in mass, orbit, temperature and brightness.<\/p>\n

Beta Pictoris d also resembles another planet called 51 Eridani b.<\/p>\n

Both belong to stars in the same group and appear nearly like twins. Astronomers<\/a> may use them to test models of how planets grow and change over time.<\/p>\n

The comparison matters because direct images capture only a small number of exoplanets. Most known planets appear through indirect methods, such as changes in a star\u2019s light or motion.<\/p>\n

A faint world captured directly offers a different kind of evidence.<\/p>\n

Dynamical prediction for a planet sculpting the disk inner edge. The predicted planet should lie in the white region to 1\u03c3, in agreement with our adopted parameters for \u03b2 Pic d. (CREDIT: The Astrophysical Journal Letters) The Missing Sculptor of a Debris Disc<\/p>\n

The new planet also addresses an old puzzle.<\/p>\n

Beta Pictoris contains a surrounding debris disc made from material left after planet formation. Its shape could not be fully explained by the two known planets.<\/p>\n

Beta Pictoris d has the right position and mass to help account for the disc\u2019s structure.<\/p>\n

A planet can shape nearby debris through gravity<\/a>.<\/p>\n

Its repeated pull can clear regions, bend material or help create visible patterns around a star. The newly found world occupies the area where an additional planet could influence the disc.<\/p>\n

That agreement links the direct image with features already seen in the wider system.<\/p>\n

The planet was not simply another faint point near the star. Its location fits a role that astronomers had reason to suspect.<\/p>\n

Why the Planet Stayed Hidden<\/p>\n

Beta Pictoris d escaped detection partly because direct imaging depends strongly on timing and position. A planet may appear too close to its star during one observation.<\/p>\n

CMDs of \u03b2 Pic d, shown alongside photometry for directly imaged planets in BPMG (blue stars) and around other stars (brown stars), as well as free-floating brown dwarfs in BPMG (blue circles) and the field (pink circles). (CREDIT: The Astrophysical Journal Letters) <\/p>\n

At another moment, it may overlap with the glare of a larger companion.<\/p>\n

The Beta Pictoris system appears nearly edge-on from Earth. Its planets can move into difficult viewing positions. In some archived observations, planet d lay near Beta Pictoris b. In others, it approached the bright central star<\/a>.<\/p>\n

The planet\u2019s faintness added another barrier. Even advanced instruments must separate its light from atmospheric noise, starlight and nearby objects.<\/p>\n

These limits help explain why extensive observations did not produce an immediate discovery.<\/p>\n

The evidence became convincing only after researchers connected detections across many years.<\/p>\n

That process also leaves uncertainties.<\/p>\n

Direct imaging favors relatively bright planets that remain far enough from their stars<\/a> to separate. Dimmer or lower-mass worlds may still remain unseen.<\/p>\n

More Companions Could Be Waiting<\/p>\n

\u201cPlanets seem to have friends,\u201d said Beth Biller of the University of Edinburgh.<\/p>\n

Marginalized posterior distributions for the semimajor axis, eccentricity, and inclination of planet d from our orbital fit, along with their joint posteriors. (CREDIT: The Astrophysical Journal Letters) <\/p>\n

Many famous directly imaged systems contain several giant planets. Biller said lower-mass planets may still hide within them.<\/p>\n

ESO\u2019s Extremely Large Telescope<\/a> could help expose those worlds. The telescope, known as the ELT, will offer new opportunities to image faint planets around nearby stars.<\/p>\n

Beta Pictoris d provides a clear reason to revisit familiar targets.<\/p>\n

A system observed many times may still contain a planet buried in glare or stored unnoticed in an archive.<\/p>\n

The discovery also rewards cooperation between instruments. Ground telescopes can provide long histories and powerful adaptive optics. Space observatories can add exceptional infrared sensitivity.<\/p>\n

Neither replaces the other.<\/p>\n

For Beta Pictoris d, both became part of the same planetary portrait.<\/p>\n

Practical Implications of the Research<\/p>\n

The finding gives astronomers a stronger reason to reanalyze archival telescope data.<\/p>\n

Known planetary systems may contain faint companions that earlier searches missed. Improved processing and better orbital<\/a> predictions can make those signals easier to recognize.<\/p>\n

Multiple planets around one star also provide valuable tests of formation models. Because the worlds share an environment, their differences can help researchers separate the effects of mass, distance and temperature.<\/p>\n

Beta Pictoris d adds another gravitational influence to models of the system\u2019s debris disc.<\/p>\n

Its presence may improve explanations for how planets reshape leftover material after formation.<\/p>\n

The discovery also sets a target for future instruments. Telescopes such as the ELT<\/a> may find smaller and fainter planets in systems already considered well studied. A decade of hidden appearances carries a simple lesson.<\/p>\n

Sometimes the next planet is not beyond the reach of existing observations. It is already inside them, waiting for someone to notice.<\/p>\n

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