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NASA’s Hubble Observes Exoplanet Atmosphere Changing Over 3 Years


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NASA’s Hubble Observes Exoplanet Atmosphere Changing Over 3 Years

By combining several years of observations from NASA’s Hubble Space Telescope along with conducting computer modelling, astronomers have found evidence for massive cyclones and other dynamic weather activity swirling on a hot, Jupiter-sized planet 880 light-years away.

The planet, called WASP-121 b, is not habitable. But this result is an important early step in studying weather patterns on distant worlds, and perhaps eventually finding potentially habitable exoplanets with stable, long-term climates.

A large, yellow-white star fills the center of the image. A
This is an artist’s concept of the exoplanet WASP-121 b, also known as Tylos. The exoplanet’s appearance is based on Hubble simulation data of the object. Using Hubble observations, another team of scientists had previously reported the detection of heavy metals such as magnesium and iron escaping from the upper atmosphere of the ultra-hot Jupiter exoplanet; marking it as the first of such detection. The exoplanet is orbiting dangerously close to its host star, roughly 2.6% of the distance of Earth to the Sun, placing it on the verge of being ripped apart by the star’s tidal forces. The powerful gravitational forces have altered the planet’s shape.

An international team of astronomers assembled and reprocessed Hubble observations of the exoplanet in the years 2016, 2018 and 2019. This provided them with a unique data-set that allowed them to not only analyze the atmosphere of WASP-121 b, but also to compare the state of the exoplanet’s atmosphere across several years. They found clear evidence that the observations of WASP-121 b were varying in time. The team then used sophisticated modelling techniques to demonstrate that these temporal variations could be explained by weather patterns in the exoplanet’s atmosphere.

NASA, ESA, Quentin Changeat (ESA/STScI), Mahdi Zamani (ESA/Hubble)

For the past few decades, detailed telescopic and spacecraft observations of neighboring planets in our solar system show that their turbulent atmospheres are not static but constantly changing, just like weather on Earth. This variability should also apply to planets around other stars, too. But it takes lots of detailed observing and computational modelling to actually measure such changes.

To make the discovery, an international team of astronomers assembled and reprocessed Hubble observations of WASP-121 b taken in 2016, 2018, and 2019.

They found that the planet has a dynamic atmosphere, changing over time. The team used sophisticated modelling techniques to demonstrate that these dramatic temporal variations could be explained by weather patterns in the exoplanet’s atmosphere.

The team found that WASP-121 b’s atmosphere shows notable differences between observations. Most dramatically, there could be massive weather fronts, storms, and massive cyclones that are repeatedly created and destroyed due to the large temperature difference between the star-facing side and dark side of the exoplanet. They also detected an apparent offset between the exoplanet’s hottest region and the point on the planet closest to the star, as well as variability in the chemical composition of the exoplanet’s atmosphere (as measured via spectroscopy).

The team reached these conclusions by using computational models to help explain observed changes in the exoplanet’s atmosphere. “The remarkable details of our exoplanet atmosphere simulations allows us to accurately model the weather on ultra-hot planets like WASP-121 b,” explained Jack Skinner, a postdoctoral fellow at the California Institute of Technology in Pasadena, California, and co-leader of this study. “Here we make a significant step forward by combining observational constraints with atmosphere simulations to understand the time-varying weather on these planets.”


This visualization shows the temperature forecast spanning 130 exoplanet-days, across sunrise, noon, sunset, and midnight for the exoplanet WASP-121 b, also known as Tylos. The brighter yellow regions depict areas in the day side of the exoplanet where temperatures soar well above 2,100 degrees Kelvin (3,320 degrees Fahrenheit); due to the close proximity to its host star, roughly 2.6% of the distance of Earth to the Sun. Due to the extreme temperature difference between the day and night sides, astronomers suspect evaporated iron and other heavy metals escaping into the higher layers of atmosphere on the day side partially fall back onto lower layers, making it rain iron at night. Some of the heavy metals also escape the planet’s gravity from the upper atmosphere.

It only takes WASP-121 b roughly 31 hours to complete an orbit around its star.

An international team of astronomers assembled and reprocessed Hubble observations of the exoplanet in the years 2016, 2018, and 2019. This provided them with a unique data-set that allowed them to not only analyze the atmosphere of WASP-121 b, but also to compare the state of the exoplanet’s atmosphere across several years. They found clear evidence that the observations of WASP-121 b were varying in time. The team then used sophisticated modelling techniques to demonstrate that these temporal variations could be explained by weather patterns in the exoplanet’s atmosphere, as seen here.

The international team of astronomers in this study consists of: Q. Changeat (European Space Agency (ESA), Space Telescope Science Institute (STScI), University College London); J.W. Skinner (California Institute of Technology, Brandeis University); J. Y-K. Cho, (Brandeis University, Center for Computational Astrophysics/Flatiron Institute); J. Nättilä (Center for Computational Astrophysics/ Flatiron Institute, Columbia University); I.P. Waldmann (University College London); A.F. Al-Refaie (University College London); A. Dyrek (Université Paris Cité, Université Paris-Saclay); B. Edwards (Netherlands Institute for Space Research, University College London); T. Mikal-Evans (Max Planck Institute for Astronomy); M. Joshua (Blue Skies Space Ltd.); G. Morello (Chalmers University of Technology, Instituto de Astrofísica de Canarias); N. Skaf (National Astronomical Observatory of Japan, Université de Paris, University College London); A. Tsiaras (University College London); O. Venot (Université de Paris Cité, Université Paris Est Creteil); and K.H. Yip (University College London). Credit: NASA, ESA, Quentin Changeat (ESA/STScI), Mahdi Zamani (ESA/Hubble)

“This is a hugely exciting result as we move forward for observing weather patterns on exoplanets,” said one of the principal investigators of the team, Quentin Changeat, a European Space Agency Research Fellow at the Space Telescope Science Institute in Baltimore, Maryland. “Studying exoplanets’ weather is vital to understanding the complexity of exoplanet atmospheres on other worlds, especially in the search for exoplanets with habitable conditions.”

WASP-121 b is so close to its parent star that the orbital period is only 1.27 days. This close proximity means that the planet is tidally locked so that the same hemisphere always faces the star, in the same way that our Moon always has the same side pointed at Earth. Daytime temperatures approach 3,450 degrees Fahrenheit (2,150 degrees Kelvin) on the star-facing side of the planet.

The team used four sets of Hubble archival observations of WASP-121 b. The complete data-set included observations of WASP-121 b transiting in front of its star (taken in June 2016); WASP-121 b passing behind its star, also known as a secondary eclipse (taken in November 2016); and the brightness of WASP-121 b as a function of its phase angle to the star (the varying amount of light received at Earth from an exoplanet as it orbits its parent star, similar to our Moon’s phase-cycle). These data were taken in March 2018 and February 2019, respectively.

“The assembled data-set represents a significant amount of observing time for a single planet and is currently the only consistent set of such repeated observations,” said Changeat. The information that we extracted from those observations was used to infer the chemistry, temperature, and clouds of the atmosphere of WASP-121 b at different times. This provided us with an exquisite picture of the planet changing over time.”

Hubble’s capabilities also are evident in the broad expanse of science programs it will enable through its Cycle 31 observations, which began on December 1. About two-thirds of Hubble’s time will be devoted to imaging studies, while the remainder is allotted to spectroscopy studies, like those used for WASP-121 b. More details about Cycle 31 science are in a recent announcement.


This visualization shows the weather patterns on the exoplanet WASP-121 b, also known as Tylos. This video has been slowed to observe the patterns in the exoplanet’s atmosphere in closer detail.

An international team of astronomers assembled and reprocessed Hubble observations of the exoplanet in the years 2016, 2018, and 2019. This provided them with a unique data-set that allowed them to not only analyze the atmosphere of WASP-121 b, but also to compare the state of the exoplanet’s atmosphere across several years. They found clear evidence that the observations of WASP-121 b were varying in time. The team then used sophisticated modelling techniques to demonstrate that these temporal variations could be explained by weather patterns in the exoplanet’s atmosphere, as seen here.

The science team’s models found that their results could be explained by quasi-periodic weather patterns: specifically, massive cyclones that are repeatedly created and destroyed due to the huge temperature difference between the star-facing and dark side of the exoplanet. This result represents a significant step forward in potentially observing weather patterns on exoplanets.

The international team of astronomers in this study consists of: Q. Changeat (European Space Agency (ESA), Space Telescope Science Institute (STScI), University College London); J.W. Skinner (California Institute of Technology, Brandeis University); J. Y-K. Cho, (Brandeis University, Center for Computational Astrophysics/Flatiron Institute); J. Nättilä (Center for Computational Astrophysics/ Flatiron Institute, Columbia University); I.P. Waldmann (University College London); A.F. Al-Refaie (University College London); A. Dyrek (Université Paris Cité, Université Paris-Saclay); B. Edwards (Netherlands Institute for Space Research, University College London); T. Mikal-Evans (Max Planck Institute for Astronomy); M. Joshua (Blue Skies Space Ltd.); G. Morello (Chalmers University of Technology, Instituto de Astrofísica de Canarias); N. Skaf (National Astronomical Observatory of Japan, Université de Paris, University College London); A. Tsiaras (University College London); O. Venot (Université de Paris Cité, Université Paris Est Creteil); and K.H. Yip (University College London). Credit: NASA, ESA, Quentin Changeat (ESA/STScI), Mahdi Zamani (ESA/Hubble)

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The Hubble Space Telescope is a project of international cooperation between NASA and ESA. NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Space Telescope Science Institute (STScI) in Baltimore, Maryland, conducts Hubble and Webb science operations. STScI is operated for NASA by the Association of Universities for Research in Astronomy, in Washington, D.C.

Media Contacts:

Claire Andreoli
NASA’s Goddard Space Flight CenterGreenbelt, MD
claire.andreoli@nasa.gov

Ray Villard
Space Telescope Science Institute, Baltimore, MD

Bethany Downer
ESA/Hubble

Science Contact:

Quentin Changeat
ESA/STScI

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Last Updated
Jan 04, 2024
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Andrea Gianopoulos
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      NASA, ESA, M. Boyer (Space Telescope Science Institute), and J. Dalcanton (University of Washington); Image Processing: Gladys Kober (NASA/Catholic University of America) Clusters of stars set the interstellar medium ablaze in the Andromeda Galaxy about 2.5 million light-years away. Also known as M31, Andromeda is the Milky Way’s closest major galaxy. It measures approximately 152,000 light-years across and, with almost the same mass as our home galaxy, is headed for a collision with the Milky Way in 2-4 billion years. In the meantime, Andromeda remains an object of study for many astronomers.
      As a spiral galaxy, Andromeda’s winding arms are one of its most remarkable features. NASA’s Hubble Space Telescope zoomed in to get a close look at one of its tendrils in the northeast, revealing swathes of ionized gas. These regions — which are common in spiral and irregular galaxies — often indicate the presence of recent star formation. The combination of stellar nurseries and supernovae create a dynamic environment that excites the surrounding hydrogen gas, flourishing it into a garden of star-studded roses.
      NASA, ESA, M. Boyer (Space Telescope Science Institute), and J. Dalcanton (University of Washington); Image Processing: Gladys Kober (NASA/Catholic University of America) Scientists probed Andromeda’s spiral arms using Hubble’s Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3) to analyze the collection of stars buried in its cosmic bouquets. With ACS and WFC3’s wide spectral coverage, Hubble could peer through the hedges of gas and observe a valuable sample of these stars. The extent of the study spanned a vast range of stars, providing not just a clear view of Andromeda’s stellar history and diversity, but also more insight on stellar formation and evolution overall. By examining these stars in our local cosmic neighborhood, scientists can better understand those within galaxies in the distant universe.

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      This inset image shows the location of Hubble’s view within the Andromeda galaxy. NASA, ESA, M. Boyer (Space Telescope Science Institute), J. Dalcanton (University of Washington), and KPNO/NOIRLab/NSF/AURA/Adam Block; Image Processing: Gladys Kober (NASA/Catholic University of America) This inset image shows the location of Hubble’s view within the Andromeda galaxy. NASA, ESA, M. Boyer (Space Telescope Science Institute), J. Dalcanton (University of Washington), and KPNO/NOIRLab/NSF/AURA/Adam Block; Image Processing: Gladys Kober (NASA/Catholic University of America) Explore More

      Hubble’s Galaxies

      Facebook logo @NASAHubble @NASAHubble Instagram logo @NASAHubble Media Contact:
      Claire Andreoli
      NASA’s Goddard Space Flight Center, Greenbelt, MD
      claire.andreoli@nasa.gov
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      Last Updated Aug 30, 2024 Editor Michelle Belleville Location NASA Goddard Space Flight Center Related Terms
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    • By NASA
      4 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      NASA’s Student Launch, a STEM competition, officially kicks off its 25th anniversary with the 2025 handbook. By Wayne Smith
      NASA’s Student Launch competition kicks off its 25th year with the release of the 2025 handbook, detailing how teams can submit proposals by Wednesday, Sept. 11, for the event scheduled next spring near NASA’s Marshall Space Flight Center in Huntsville, Alabama.
      Student Launch is an annual competition challenging middle school, high school, and college students to design, build, test, and launch a high-powered amateur rocket with a scientific or engineering payload. After a team is selected, they must meet documentation milestones and undergo detailed reviews throughout the school year.
      Each year, NASA updates the university payload challenge to reflect current scientific and exploration missions. For the 2025 season, the payload challenge will again take inspiration from the Artemis missions, which seek to land the first woman and first person of color on the Moon.
      As Student Launch celebrates its 25th anniversary, the payload challenge will include “reports” from STEMnauts, non-living objects representing astronauts. The 2024 challenge tasked teams with safely deploying a lander mid-air for a group of four STEMnauts using metrics to support a survivable landing. The lander had to be deployed without a parachute and had a minimum weight limit of five pounds.
      “This year, we’re shifting the focus to communications for the payload challenge,” said John Eckhart, technical coordinator for Student Launch at Marshall. “The STEMnaut ‘crew’ must relay real-time data to the student team’s mission control. This helps connect Student Launch with the Artemis missions when NASA lands astronauts on the Moon.”
      Thousands of students participated in the 2024 Student Launch competition – making up 70 teams representing 24 states and Puerto Rico. Teams launched their rockets to an altitude between 4,000 and 6,000 feet, while attempting to make a successful landing and executing the payload mission. The University of Notre Dame was the overall winner of the 2024 event, which culminated with a launch day open to the public.
      Student Launch began in 2000 when former Marshall Director Art Stephenson started a student rocket competition at the center. It started with just two universities in Huntsville competing – Alabama A&M University and the University of Alabama in Huntsville – but has continued to soar. Since its inception, thousands of students have participated in the agency’s STEM competition, with many going on to a career with NASA.
      “This remarkable journey, spanning a quarter of a century, has been a testament to the dedication, ingenuity, and passion of countless students, educators, and mentors who have contributed to the program’s success,” Eckhart said. “NASA Student Launch has been at the forefront of experiential education, providing students from middle school through university with unparalleled opportunities to engage in real-world engineering and scientific research. The program’s core mission – to inspire and cultivate the next generation of aerospace professionals and space explorers – has not only been met but exceeded in ways we could have only dreamed of.”
      To encourage students to pursue degrees and careers in STEM (science, technology, engineering, and math), Marshall’s Office of STEM Engagement hosts Student Launch, providing them with real-world experiences. Student Launch is one of NASA’s nine Artemis Student Challenges – a variety of activities that expose students to the knowledge and technology required to achieve the goals of Artemis. 
      In addition to the NASA Office of STEM Engagement’s Next Generation STEM project, NASA Space Operations Mission Directorate, Northrup Grumman, National Space Club Huntsville, American Institute of Aeronautics and Astronautics, National Association of Rocketry, Relativity Space and Bastion Technologies provide funding and leadership for the competition. 
      “These bright students rise to a nine-month challenge for Student Launch that tests their skills in engineering, design, and teamwork,” said Kevin McGhaw, director of NASA’s Office of STEM Engagement Southeast Region. “They are the Artemis Generation, the future scientists, engineers, and innovators who will lead us into the future of space exploration.”
      For more information about Student Launch, please visit: 
      https://www.nasa.gov/studentlaunch
      Taylor Goodwin
      Marshall Space Flight Center, Huntsville, Ala.
      256.544.0034
      taylor.goodwin@nasa.gov
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      Last Updated Aug 29, 2024 LocationMarshall Space Flight Center Related Terms
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