{"id":4759,"date":"2026-07-02T19:07:43","date_gmt":"2026-07-02T19:07:43","guid":{"rendered":"https:\/\/relocationtimess.com\/?p=4759"},"modified":"2026-07-02T19:07:43","modified_gmt":"2026-07-02T19:07:43","slug":"what-will-happen-to-our-solar-system-when-the-sun-dies-exoplanet-system-may-offer-preview","status":"publish","type":"post","link":"https:\/\/relocationtimess.com\/?p=4759","title":{"rendered":"What will happen to our solar system when the sun dies? Exoplanet system may offer preview"},"content":{"rendered":"
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\n New observations may offer fresh clues into how a giant exoplanet survived the violent death of its host star \u2014 and came to closely orbit its stellar remnants.\n <\/p>

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\n The findings could serve as a preview of the fate that may await our solar system\u2019s largest planets \u2014 such as the gas giants Jupiter and Saturn \u2014 when the sun dies in 5 billion years.\n <\/p>\n

\n Astronomers detected a baffling Jupiter-size planet in 2020 that was zipping around a dead white dwarf star. Located 80 light-years from our planet, WD 1856 b is seven times larger than its Earth-size star.\n <\/p>\n

\n \u201cThis is one of the most bizarre planetary systems we know of,\u201d said Dr. Christopher O\u2019Connor, coauthor of a study published Wednesday in the journal Nature that detailed the observations. O\u2019Connor is a postdoctoral fellow studying stellar and planetary astrophysics and dynamics at Northwestern University\u2019s Center for Interdisciplinary Exploration and Research in Astrophysics.\n <\/p>\n

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\nThis 1.7-gigapixel image of a field of stars in the constellation Lupus showcases the unprecedented view of the Universe that NSF\u2013DOE Vera C. Rubin Observatory gives us. Equipped with the LSST Camera \u2014 the largest digital camera in the world \u2014 Rubin combines a wide view of the sky with the ability to detect extremely faint objects. With this capability, Rubin can reveal details of the cosmos across an enormous range of scales, from distant galaxies, to individual stars, to the wispy clouds of dust spread throughout our galaxy. The faint, glowing clouds spread across this image are galactic cirrus: clouds of interstellar gas and dust that can be seen in the foreground of the Milky Way. Rubin\u2019s ability to capture scenes like this in unmatched detail will open new windows into the structure of our galaxy and the Universe beyond it.<\/span>\n<\/div>\n
NSF\u2013DOE Vera C. Rubin Observatory\/NOIRLab\/SLAC\/AURA<\/figcaption>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\n\u2018The greatest cosmic movie ever made\u2019: Historic telescope kicks off an unprecedented survey<\/span>\n<\/p>\n

3 min read<\/div>\n<\/div>\n<\/section>\n<\/div>\n

\n WD 1856 b completes one orbit around the dead star every 34 hours and is less than 2 million miles (3 million kilometers) from its host.\n <\/p>\n

\n When a massive sunlike star exhausts the hydrogen fuel at its core, it puffs up to more than 100 times its size before collapsing into a dense white dwarf. Given the close proximity of WD 1856 b to its star \u2014 50 times closer than Earth is to our sun \u2014 astronomers were unsure how the planet survived its host\u2019s destruction.\n <\/p>\n

\n In order to retrace WD 1856 b\u2019s unlikely journey of survival, O\u2019Connor and his colleagues used the James Webb Space Telescope to capture the latest glimpses of the planet and measure its atmosphere, mass and temperature. Almost every finding the team made was unexpected \u2014 and suggested that huge planets can survive the demise of their host stars in ways previously thought impossible.\n <\/p>\n

\n An oddball planet\n<\/h2>\n

\n The planet\u2019s tight orbit and the lopsided relative sizes of WD 1856 b and its host star motivated O\u2019Connor and his colleagues to investigate further.\n <\/p>\n

\n \u201cFor a theoretical astrophysicist, finding a strange object located where it \u2018shouldn\u2019t be\u2019 feels a bit like an invitation from the universe to get creative in search of an explanation,\u201d O\u2019Connor wrote in an email.\n <\/p>\n

\n But making observations with Webb was challenging. The team had limited chances to watch a transit, or the dip in starlight as a planet passes in front of its star. Dead white dwarfs are much dimmer than the planet-hosting stars normally observed with Webb, said study coauthor Victoria Boehm, a graduate student in the department of astronomy at Cornell University.\n <\/p>\n

\n \u201cTo make things even harder, the planet\u2019s transit only lasts 8 minutes, so it\u2019s very much if you blink you miss it,\u201d Boehm said in a statement. \u201cCapturing enough light to see WD 1856 b\u2019s spectrum, while also doing so quickly enough to not miss the transit, is something only Webb can do.\u201d\n <\/p>\n

\n But the spectrum, or data captured as light from the star passed through the planet\u2019s atmosphere, revealed previously unknown information about WD 1856 b.\n <\/p>\n

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\nThe red bands indicate that the planet’s atmosphere contains methane.<\/span>\n<\/div>\n
NASA\/ESA\/CSA\/Joseph Olmsted (STScl)<\/figcaption>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\n The team determined that the planet is between four and 11 times the mass of Jupiter.\n <\/p>\n

\n Infrared light emitted by WD 1856 b suggested that it has a temperature of about 260 degrees Fahrenheit (127 degrees Celsius) \u2014 about 240 degrees hotter than if it were solely being heated by the dead star.\n <\/p>\n

\n \u201cThat was really what started us on the track of figuring out the planet\u2019s history from our data,\u201d O\u2019Connor said.\n <\/p>\n

\n A curious migration\n<\/h2>\n

\n The team combined the new measurements with models of how giant planets like Jupiter and Saturn cool over time, which occurs at a predictable rate related to their mass.\n <\/p>\n

\n The results showed that the planet originally orbited the star from a safer, much greater distance. But WD 1856 b heated up while migrating inward after the star died.\n <\/p>\n

\n The researchers have two competing theories about how WD 1856 b ended up in its current, tight orbit.\n <\/p>

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\n The \u201cengulfment model\u201d suggests that the planet was actually swallowed by the host star as it ballooned in size before dying but managed to survive, O\u2019Connor said. The \u201cgravitational interaction model\u201d alternatively proposes that WD 1856 b avoided the star\u2019s death throes, but the gravitational influence of other objects in the system pushed it closer to the white dwarf, he added.\n <\/p>\n

\n \u201cIn either situation, there is reason to think that the planet would get heated up on the inside as a byproduct of the violent migration process,\u201d O\u2019Connor said. \u201cIn the first scenario, we would expect the migration and heating to have occurred simultaneously with the death of the host star, or about six billion years ago. In the second scenario, it can happen billions of years later, due to the chaos of gravitational interactions.\u201d\n <\/p>\n

\n The team\u2019s data seems to indicate that heating of the planet occurred about 1 billion years ago, which might rule out the chances of engulfment \u2014 as does the Webb spectrum, which picked up on hints of the planet\u2019s chemical composition.\n <\/p>\n

\n \u201cWe saw the telltale signatures of small cloud particles and hydrocarbons, most likely methane, which is the first time we have seen an atmosphere on a planet transiting a dead star,\u201d Boehm said. \u201cWe recently observed four more transits of WD 1856 b with Webb to take a deeper look into its atmospheric chemistry and can\u2019t wait to see the results.\u201d\n <\/p>\n

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\nArtist\u2019s impression of a black hole star (not to scale). The cut-out reveals the central black hole with it surrounding accretion disk. What makes this a black hole star is the surrounding envelope of turbulent gas. This configuration can explain what astronomers observe in the object they are calling \u201cThe Cliff.\u201d<\/span>\n<\/div>\n
MPIA\/HdA\/T. M\u00fcller\/A. de Graaff<\/figcaption>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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8 min read<\/div>\n<\/div>\n<\/section>\n<\/div>\n

\n The abundance of methane adds another line of evidence that the planet didn\u2019t go through engulfment during the red giant phase since that would have diluted the gas\u2019 abundance as the planet accreted hydrogen from the star, said lead author Dr. Ryan MacDonald, lecturer in extrasolar planets at the University of St. Andrews in Scotland.\n <\/p>\n

\n Dr. Caroline Morley, an associate professor in the department of astronomy at the University of Texas at Austin, said the discrepancies in inferred temperature results between the new study, which suggests the planet is quite warm, and previous research she coauthored, which identified the planet as much cooler, give her pause. Morley was not involved in the new study.\n <\/p>\n

\n \u201cThere are reasons to be skeptical about the result that the planet was \u2018reheated\u2019 during stellar evolution,\u201d Morley wrote in an email. \u201cI do think that the tentative methane detection looks plausible, and the detection of clouds and\/or hazes is solid. At this temperature, the best first guess for what \u2018aerosols\u2019 are present is water clouds, which form and become quite thick at these temperatures.\u201d\n <\/p>\n

\n While the detection of atmospheric methane was not surprising, the amount of the gas was higher than might be predicted, said Dr.Ian Crossfield, an associate professor of physics and astronomy at the University of Kansas. Crossfield was not involved in the new study but was part of the team that discovered WD 1856 b in 2020.\n <\/p>\n

\n \u201cThe conclusions about the planet\u2019s migration to its present-day orbit are provocative, though more study is likely needed before firm conclusions can be drawn,\u201d Crossfield wrote in an email. \u201cThe paper demonstrates how JWST\u2019s most revealing planetary observations continue to be those of gas giants \u2014 analogues of our own Jupiter or Saturn \u2014 even when the star they orbit has died long ago.\u201d\n <\/p>\n

\n Modeling the fate of our solar system\n<\/h2>\n

\n The WD 1856 system acts like a preview for what could occur in our own solar system.\n <\/p>\n

\n Like the host star of WD 1856 b, our sun will swell into a red giant in about 5 billion years, engulfing the closest planets like Mercury and Venus. Earth\u2019s orbit places it right on the edge of this future \u201cdanger zone,\u201d O\u2019Connor said, so the fate of our planet remains unclear.\n <\/p>\n

\n But rather than coming to a quick conclusion, the giant planets in our solar system may endure and continue to evolve for billions of years. The WD 1856 system is expected to remain in its current state for trillions of years, O\u2019Connor noted.\n <\/p>\n

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\nThis image shows the gravitationally lensed galaxy nicknamed “Shadow Blaster,” which astronomers have identified as the likely source of the high-energy neutrino event IC 210922A, detected by the IceCube Neutrino Observatory in 2021. Gravitational lensing occurs when a very massive foreground galaxy bends space-time, acting as a cosmic magnifying glass that enlarges and distorts the image of a more distant galaxy behind it. In this case, the red foreground galaxy is bending the light of the more distant Shadow Blaster galaxy, creating multiple distorted images of it that appear here as yellow arcs. This composite image was created using data from the Atacama Large Millimeter\/submillimeter Array (ALMA) and the Gemini North telescope, one half of the International Gemini Observatory, partly funded by the U.S. National Science Foundation and operated by NSF NOIRLab. See an image of Shadow Blaster without the foreground galaxy here.<\/span>\n<\/div>\n
International Gemini Observatory\/NOIRLab\/NSF\/AURA\/ALMA (ESO\/NAOJ\/NRAO)<\/figcaption>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\nAstronomers trace a ghostly cosmic particle to distant \u2018Shadow Blaster\u2019 galaxy<\/span>\n<\/p>\n

5 min read<\/div>\n<\/div>\n<\/section>\n<\/div>\n

\n \u201cOur results show that stellar death is not the end \u2014 some planets experience a vibrant and lively future after the death of their star,\u201d MacDonald said.\n <\/p>\n

\n As the sun transitions into a white dwarf about a billion years after the red giant stage ends, the rest of the planets in our solar system will continue to orbit the dead star.\n <\/p>\n

\n \u201cWe expect the survivors to gradually drift away from the Sun until they reach about double their current orbital distances,\u201d O\u2019Connor wrote. \u201cPerhaps, however, we should think about whether their orbits could change more dramatically, bringing one of them to migrate as close to the solar white dwarf as WD 1856 b is today.\u201d\n <\/p>\n

\n Sign up for CNN\u2019s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more.\n<\/p>

Read more US service member arrested at Capitol after calling for Trump\u2019s impeachment<\/a><\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

A Jupiter-size exoplanet orbiting a dead star baffled astronomers. But the planet named WD 1856 b could preview the fate of our own solar system when the sun dies.<\/p>\n","protected":false},"author":1,"featured_media":4752,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,11],"tags":[],"class_list":["post-4759","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-space"],"yoast_head":"\nWhat will happen to our solar system when the sun dies? 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