An astronomical waltz reveals a sextuplet of planets
An international collaboration between astronomers using the CHEOPS and TESS space satellites, including NCCR PlanetS members from the University of Bern and the University of Geneva, have found a key new system of six transiting planets orbiting a bright star in a harmonic rhythm. This rare property enabled the team to determine the planetary orbits which initially appeared as an unsolvable riddle.
CHEOPS is a joint mission by ESA and Switzerland, under the leadership of the University of Bern in collaboration with the University of Geneva. Thanks to a collaboration with scientists working with data from NASA’s satellite TESS, the international team could uncover the planetary system orbiting the nearby star HD110067. A very distinctive feature of this system is its chain of resonances: the planets orbit their host star in perfect harmony. Part of the research team are researchers from the University of Bern and the University of Geneva who are also members of the National Center of Competence in Research (NCCR) PlanetS. The findings have just been published in Nature.
The planets in the HD110067 system revolve around the star in a very precise waltz. When the closest planet to the star makes three full revolutions around it, the second one makes exactly two during the same time. This is called a 3:2 resonance. “Amongst the over 5000 exoplanets discovered orbiting other stars than our Sun, resonances are not rare, nor are systems with several planets. What is extremely rare though, is to find systems where the resonances span such a long chain of six planets” points out Dr. Hugh Osborn, CHEOPS fellow at the University of Bern, leader of CHEOPS observation programme involved in the study, and co-author of the publication. This is precisely the case of HD110067 whose planets form a so-called “resonant chain” in successive pairs of 3:2, 3:2, 3:2, 4:3, and 4:3 resonances, resulting in the closest planet completing six orbits while the outer-most planet does one.
A seemingly unsolvable puzzle
Although multiple planets were initially detected thanks to their transits, the exact arrangement of the planets was unclear at first. However, the precise gravitational dance enabled the scientists’ team to solve the puzzle of HD110067. Prof. Adrien Leleu from the University of Geneva, in charge of analysing the orbital resonances, and co-author of the study, explains: “A transit occurs when a planet, from our point of view, passes in front of its host star, blocking a minute fraction of the starlight, creating an apparent dip of its brightness.” From the first observations carried out by NASA’s TESS satellite, it was possible to determine that the two inner planets called ‘b’ and ‘c’ have orbital periods of 9 and 14 days respectively. However, no conclusions could be drawn for the other four detected planets as two were seen to transit once in 2020 and once in 2022 with a large 2-year gap in the data, and the other two transited only once in 2022.
The solution to the puzzle for those four additional planets finally began to emerge thanks to observations with the CHEOPS space telescope. While TESS aims at scanning all of the sky bit by bit to find short-period exoplanets, CHEOPS is a targeted mission, focusing on a single star at a time with exquisite precision. “Our CHEOPS observations enabled us to find that the period of planet ‘d’ is 20.5 days. Also, it ruled out multiple possibilities for the remaining three outer planets, ‘e’, ‘f’ and ‘g’,” reveals Osborn.
Predicting the precise waltz of the planets
That is when the team realized that the three inner planets of HD110067 are dancing in a precise 3:2, 3:2 chain of resonances: when the innermost planet revolves nine times around the star, the second revolves six times and the third planet four times.
The team then considered the possibility that the three other planets could also be part of the chain of resonances. “This led to dozens of possibilities for their orbital period,” explains Leleu, “but combining existing observational data from TESS and CHEOPS, with our model of the gravitational interactions between the planets, we could exclude all solutions but one: the 3:2, 3:2, 3:2, 4:3, 4:3 chain.” The scientists could therefore predict that the outer three planets (‘e’, ‘f’ and ‘g’) have orbital periods of 31, 41 days, and 55 days.
This prediction allowed to schedule observations with a variety of ground-based telescopes. Further transits of planet ‘f’ were observed, revealing it was precisely where theory predicted it based on the resonant-chain. Finally, reanalysis of the data from TESS revealed two hidden transits, one from each of planets ‘f’ and ‘g’, exactly at the times expected by the predictions, confirming the periods of the six planets. Additional CHEOPS observations of each planet, and in particular planet ‘e’ are scheduled in the near future.
A key system for the future
From the handful of resonant-chain systems found so far, CHEOPS has highly contributed to the understanding of not only HD110067, but also of TOI-178. Another well-known example of a resonant-chain system is the TRAPPIST-1 system which hosts seven rocky planets. However, TRAPPIST-1 is a small and incredibly faint star which makes any additional observations very difficult. HD110067, on the other hand, is more than 50 times brighter than TRAPPIST-1.
“The fact that the planets in the HD110067 system have been detected by the transit method is key. While they pass in front of the star, light also filters through the planetary atmospheres” points out Jo Ann Egger, PhD student at the University of Bern, who computed the composition of the planets using CHEOPS data, and co-author of the study. This property is allowing astronomers to determine the chemical composition and other properties of the atmospheres. Since a lot of light is required, the bright star HD110067 and its orbiting planets are an ideal target for further studies to charachterize the planetary atmospheres. “The sub-Neptune planets of the HD110067 system appear to have low masses, suggesting they may be gas- or water-rich. Future observations, for example with the James Webb Space Telescope (JWST), of these planetary atmospheres could determine whether the planets have rocky or water-rich interior structures,” concludes Egger.
TOP IMAGE....A rare family of six exoplanets has been unlocked with the help of ESA’s Cheops mission. The planets in this family are all smaller than Neptune and revolve around their star HD110067 in a very precise waltz. When the closest planet to the star makes three full revolutions around it, the second one makes exactly two during the same time. This is called a 3:2 resonance. The six planets form a resonant chain in pairs of 3:2, 3:2, 3:2, 4:3, and 4:3, resulting in the closest planet completing six orbits while the outer-most planet does one. Cheops confirmed the orbital period of the third planet in the system, which was the key to unlocking the rhythm of the entire system. This is the second planetary system in orbital resonance that Cheops has helped reveal. The first one is called TOI-178. Credit © ESA
LOWER IMAGE....Tracing a link between two neighbour planet at regular time interval along their orbits, creates a pattern unique to each couple. The six planets of the HD110067 system create together a mesmerising geometric pattern due to their resonance-chain. Credit © , Thibaut Roger/NCCR PlanetS
Is Alien Life Real? JWST’s K2-18b Discovery Might Just Blow Your Mind!
What’s K2-18b, and Why Should You Care?
K2-18b is a super-Earth—think Earth, but bigger, badder, and 8.6 times our planet’s mass. It orbits a cool red dwarf star in the habitable zone, where liquid water (aka life’s BFF) could exist. Discovered in 2015 by NASA’s Kepler mission, this exoplanet is 124 light-years away in the constellation Leo, zipping around its star every ~33 days.
The James Webb Space Telescope, aka the universe’s ultimate peeping Tom, is designed to snoop on distant planets’ atmospheres. Using its fancy spectrographs (NIRISS, NIRSpec, and MIRI), JWST analyzed starlight passing through K2-18b’s atmosphere and found some wild stuff:
The catch? The DMS/DMDS signals are at a three-sigma level (99.7% confidence), not the gold-standard five-sigma (99.99994%). Scientists need more data to be sure, but the levels detected—10 parts per million, thousands of times higher than Earth’s—are making jaws drop. As Professor Nikku Madhusudhan, the lead researcher, said, “This is the strongest evidence yet there is possibly life out there.”
Want the full scoop on how JWST pulled this off? Check out this epic article on James Webb Discovery!
Image: JWST’s spectra of K2-18b, showing peaks for methane, CO₂, and a tentative DMS signal. Credit: NASA, ESA, CSA, Ralf Crawford, Joseph Olmsted, Nikku Madhusudhan
But Wait, Is It Really Aliens?
Okay, before we start planning an interstellar road trip, let’s pump the brakes. The science community is super excited but also super cautious. Here’s the tea:
Skepticism Alert: Some researchers, like MIT’s Sara Seager, warn that “enthusiasm is outpacing evidence.” DMS can form without life, like in comets (shoutout to 67P/Churyumov-Gerasimenko) or through chemical reactions in hazy atmospheres.
Alternative Theories: K2-18b might not be a lush ocean world. It could be a mini gas giant with no surface or a magma ocean planet (aka a lava nightmare). Rude, right?
More Data Needed: The Cambridge team needs 16–24 more hours of JWST time to hit five-sigma certainty, which could happen in 1–2 years.
Why This Matters (Like, A Lot)
Plus, JWST is just getting started. It’s already eyeing other exoplanets like TRAPPIST-1e, and future telescopes (hello, Habitable Worlds Observatory!) will take us even closer to finding E.T. This is the kind of stuff that makes you stare at the stars and wonder, “What’s out there?”
For the latest Euclid discoveries visit this tracker - https://www.jameswebbdiscovery.com/other-missions/euclid/euclid-telescope-discoveries
Source: ESA - https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_s_first_images_the_dazzling_edge_of_darkness
Located approximately 500 million light-years away in the constellation Sculptor, the Cartwheel Galaxy, also known as ESO 350-40 or PGC 2248, mesmerized astronomers with its lenticular and ring galaxy features. With an estimated diameter of 150,000 light-years and a mass of about 2.9–4.8 × 10^9 solar masses, the galaxy's outer ring impressively showcased a circular velocity of 217 km/s. 🌌✨
JWST's powerful infrared observations brought this cosmic masterpiece into focus, offering us fresh insights into the Cartwheel Galaxy's star formation processes and its enigmatic central black hole. The captivating image not only featured the Cartwheel itself but also included two smaller companion galaxies, set against a backdrop of numerous other galaxies scattered across the cosmos. Thanks to this remarkable view, scientists have gained a deeper understanding of the Cartwheel Galaxy's evolution over billions of years. 👀🔍
The Cartwheel Galaxy's striking resemblance to a wagon wheel is the result of an intense cosmic event - a high-speed collision between a large spiral galaxy and a smaller, unseen galaxy (not visible in the image). Such galactic collisions trigger a series of smaller events, and the Cartwheel stands as a remarkable example of this phenomenon. 💫
The most prominent impact of this collision is the formation of two rings within the Cartwheel Galaxy - a brilliant inner ring and an outer ring adorned with a beautiful array of colors. These rings ripple outward from the collision's center, resembling the waves in a pond after a stone is tossed into it. This unique structure led astronomers to classify it as a "ring galaxy," a rarity compared to the more prevalent spiral galaxies like our own Milky Way. 🌌🌀
A year ago, on August 2, 2022, JWST's Mid-Infrared Instrument (MIRI) captured the mesmerizing image of the Cartwheel Galaxy, revealing not only its position within a group of galaxies but also offering a glimpse into the vigorous star formation taking place in the outer ring. This region showed an abundance of star formation, while the dusty area in between showcased numerous stars and star clusters. 🌠✨
The unveiling of this stunning image was the culmination of the dedicated efforts of NASA, ESA, CSA, STScI, and the Webb ERO Production Team, whose relentless commitment to space exploration continues to yield groundbreaking discoveries. 🙌🌠
As we celebrate the one-year anniversary of this momentous achievement, let us once again marvel at the brilliance of the James Webb Space Telescope and eagerly anticipate the incredible discoveries that lie ahead in our journey of unraveling the mysteries of the cosmos. 🎉🚀
Image credit: NASA, ESA, CSA, and STScI
🌟 Located a staggering 5,000 light-years away in the captivating Southern constellation of Centaurus, the Boomerang Nebula boasts a chilling temperature of just one degree Kelvin above absolute zero, approximately -460 degrees Fahrenheit. Brrr, it's the epitome of cosmic chill! ❄️🌌
Credit: ISRO
Read full article here
Magnetars, also known as magnetic stars or magneto neutron stars, are celestial objects that possess an extraordinarily intense magnetic field. They are among the most fascinating and powerful stars in the universe. In this article, we will delve into the definition of magnetars, their immense strength, their effects on Earth, their presence in the Milky Way, and even touch upon their comparison with black holes. So, fasten your seatbelts as we embark on a captivating journey into the world of magnetars. Read full article here.
Prepare to be captivated by the breathtaking beauty of space! NASA's James Webb Space Telescope has gifted us with a mesmerizing glimpse into the birth of celestial bodies, courtesy of Herbig-Haro 211 (HH 211). This cosmic wonder resembles the early days of our own Sun and offers invaluable insights into star formation.
🌟 Herbig-Haro objects are cosmic masterpieces born when stellar winds and gas jets from newborn stars collide with nearby interstellar matter at astonishing speeds. In Webb's high-resolution, near-infrared image, HH 211 shines with exquisite detail, showcasing a series of dazzling bow shocks to the southeast and northwest. But that's not all—this image unveils a slender bipolar jet that powers these shocks in unprecedented detail.
💫 What makes this image even more fascinating is the dance of molecules within this turbulent environment. Molecular hydrogen, carbon monoxide, silicon monoxide, and more become electrified, emitting infrared light that Webb artfully captures. This light provides a map of the intricate structure of the celestial outflows.
📸 Credits go to ESA/Webb, NASA, CSA, and T. Ray from the Dublin Institute for Advanced Studies for this celestial masterpiece.
Ready to embark on a cosmic journey? Dive into the full article and explore the cosmic wonders Webb has unveiled: here
#NASA #WebbTelescope #StellarBirth #CosmicWonders #SpaceDiscovery #Astronomy #HerbigHaro211 🚀🌠
AT2021lwx has captivated the astrophysics community as the largest cosmic explosion ever observed. Its immense brightness and longevity have set it apart from other known supernovas, offering intriguing insights into the mysteries of the universe. In this article, we delve into the factors that make AT2021lwx unique and explore how its brightness compares to other celestial explosions.
Proof Gaza Hospital hit by faulty Islamic Jihad rocket - not the IDF
Israel has releases these images proving that the Islamic Jihad is responsible for the bombing of a Gaza Hospital- the Baptist Hospital - in which Gaza officials say 500 Palestinians have been killed.
Never miss another James Webb Discovery. Tracking all the amazing discoveries made by the James Webb Space Telescope at https://www.jameswebbdiscovery.com, Follow now!
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