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Hubble measures the size of the nearest transiting Earth-sized planet
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By NASA
2 min read
Hubble Images Galaxy with an Explosive Past
A NASA Hubble Space Telescope image of the spiral galaxy NGC 941. ESA/Hubble & NASA, C. Kilpatrick This image from NASA’s Hubble Space Telescope features the spiral galaxy NGC 941, which lies about 55 million light-years from Earth. Hubble’s Advanced Camera for Surveys (ACS) collected the data that created this image. Beautiful NGC 941 is undoubtedly the main attraction in this view; however, the hazy-looking galaxy was not the motivation for collecting the data. That distinction belongs to an astronomical event that took place in the galaxy years before: the supernova SN 2005ad. The location of this faded supernova was observed as part of a study of multiple hydrogen-rich supernovae, also known as type II supernovae, to better understand the environments in which certain types of supernovae take place. While the study was conducted by professional astronomers, SN 2005ad itself owes its discovery to a distinguished amateur astronomer named Kōichi Itagaki, who has discovered over 170 supernovae.
This might raise the question of how an amateur astronomer could spot something like a supernova event before professional astronomers who have access to telescopes such as Hubble. The detection of supernovae is a mixture of skill, facilities, and luck. Most astronomical events happen over time spans that dwarf human lifetimes, but supernova explosions are extraordinarily fast, appearing very suddenly and then brightening and dimming over a period of days or weeks. Another aspect is time – data from a few hours of observations with telescopes like Hubble might take weeks, months, or sometimes even years to process and analyze. Amateur astronomers can spend much more time actively observing the skies, and sometimes have extremely impressive systems of telescopes, computers, and software they can use.
Because amateurs like Itagaki spot so many supernovae, there is actually an online system set up to report them (the Transient Name Server). This system is a big help to professional astronomers, because time is truly of the essence with supernovae events. After the reported discovery of SN 2005ab, professional astronomers were able to follow up with spectroscopic studies and confirm it as a type II supernova, which eventually led to Hubble to study its location. Such a study wouldn’t be possible without a rich library of cataloged supernovae, built with the keen eyes of amateur astronomers.
Text credit: European Space Agency
Media Contact:
Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, MD
claire.andreoli@nasa.gov
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Last Updated Nov 16, 2023 Editor Andrea Gianopoulos Location Goddard Space Flight Center Related Terms
Astrophysics Astrophysics Division Galaxies Goddard Space Flight Center Hubble Space Telescope Missions Science & Research Science Mission Directorate Spiral Galaxies The Universe Keep Exploring Discover More Topics From NASA
Hubble Space Telescope
Galaxies Stories
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Exoplanets
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By NASA
2 min read
Backyard Worlds Volunteers Complete Ten Million Classifications in an Epic Search for New Objects Among the Nearest Stars
A few Backyard Worlds volunteers. Credit: Backyard Worlds
Top (l-r): Arttu Sainio, Frank Kiwy, Jean Marc Gantier, Marianne Michaels, Les Hamlet, Melina Thévenot,
2nd row (l-r): Kevin Apps, Nikolaj Stevnbak Andersen, Rebekah Russwurm, Jörg Schümann, Guoyou Sun, Tom Bickle
3rd row (l-r): Michiharu Hyogo, Katharina Doll, Hugo Durantini-Luca, Yadukrishna Raghu, Hiro Higashimura,
4th row (l-r): Ben Pumphrey, Zbigniew Wedracki, Guillaume Colin, Anya Frazer, Dan Caselden
4th row (l-r): Kristin Grant, Maurizio Ventura, Harshdeep Singh, Celso Pessanha Machado, Austin Rothermich
6th row (l-r): Edoardo Antonini, Peter Jalowiczor, Leopold Gramaize, Hunter Brooks, William Pendrill The Backyard Worlds: Planet 9 and Backyard Worlds: Cool Neighbors projects invite members of the public to search images from NASA’s Wide-Field Infrared Survey Explorer (WISE) mission to find new objects among the nearest stars. These projects share a science team and many volunteers–a total of more than 175,000 participants from more than 167 countries. Last week, the combined efforts of this giant Backyard Worlds team reached an incredible milestone: a total of 10,000,000 classifications of WISE mission image sets.
Since 2017, when the first Backyard Worlds project (Planet 9) launched, these projects have discovered more than 3800 nearby objects, including 12% of all the known stellar and substellar objects out to a distance of 60 light years. Those objects include many rare brown dwarfs, balls of gas that are not massive enough to become stars. Among them are roughly 15 Y dwarfs–the rarest kind of brown dwarf (only about 50 are known). The discoveries also include an entirely new kind of object, the “extreme T subdwarfs,” relics from our Galaxy’s earliest days.
This work has resulted in 20 refereed publications, with more than 40 volunteers named as co-authors on those refereed publications. It has also led to 11 research notes and 25 presentations at meetings of the American Astronomical Society. Several project volunteers have participated in observing runs at NASA’s Infrared Telescope Facility and even won time on NASA’s James Webb Space Telescope.
Best of all, there’s much more data to explore, and the WISE mission continues to scan the skies! So come join the fun and make your own discoveries at backyardworlds.org and coolneighbors.org!
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Last Updated Nov 16, 2023 Related Terms
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By NASA
3 min read
NASA’s Hubble Measures the Size of the Nearest Transiting Earth-Sized Planet
This is an artist’s concept of the nearby exoplanet LTT 1445Ac, which is the size of Earth. The planet orbits a red dwarf star. The star is in a triple system, with two closely orbiting red dwarfs seen at upper right. The black dot in front of the bright light-red sphere at image center is planet LTT 1445Ac transiting the face of the star. The planet has a surface temperature of roughly 500 degrees Fahrenheit. In the foreground at lower left is another planet in the system, LTT 1445Ab. The view is from 22 light-years away, looking back toward our Sun, which is the bright dot at lower right. Some of the background stars are part of the constellation Boötes. NASA, ESA, Leah Hustak (STScI) NASA’s Hubble Space Telescope has measured the size of the nearest Earth-sized exoplanet that passes across the face of a neighboring star. This alignment, called a transit, opens the door to follow-on studies to see what kind of atmosphere, if any, the rocky world might have.
The diminutive planet, LTT 1445Ac, was first discovered by NASA’s Transiting Exoplanet Survey Satellite (TESS) in 2022. But the geometry of the planet’s orbital plane relative to its star as seen from Earth was uncertain because TESS does not have the required optical resolution. This means the detection could have been a so-called grazing transit, where a planet only skims across a small portion of the parent star’s disk. This would yield an inaccurate lower limit of the planet’s diameter.
“There was a chance that this system has an unlucky geometry and if that’s the case, we wouldn’t measure the right size. But with Hubble’s capabilities we nailed its diameter,” said Emily Pass of the Center for Astrophysics | Harvard & Smithsonian in Cambridge, Massachusetts.
Hubble observations show that the planet makes a normal transit fully across the star’s disk, yielding a true size of only 1.07 times Earth’s diameter. This means the planet is a rocky world, like Earth, with approximately the same surface gravity. But at a surface temperature of roughly 500 degrees Fahrenheit, it is too hot for life as we know it.
The planet orbits the star LTT 1445A, which is part of a triple system of three red dwarf stars that is 22 light-years away in the constellation Eridanus. The star has two other reported planets that are larger than LTT 1445Ac. A tight pair of two other dwarf stars, LTT 1445B and C, lies about 3 billion miles away from LTT 1445A, also resolved by Hubble. The alignment of the three stars and the edge-on orbit of the BC pair suggests that everything in the system is co-planar, including the known planets.
“Transiting planets are exciting since we can characterize their atmospheres with spectroscopy, not only with Hubble but also with the James Webb Space Telescope. Our measurement is important because it tells us that this is likely a very nearby terrestrial planet. We are looking forward to follow-on observations that will allow us to better understand the diversity of planets around other stars,” said Pass.
This research has been accepted for publication in The Astronomical Journal.
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 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 Center, Greenbelt, MD
claire.andreoli@nasa.gov
Ray Villard
Space Telescope Science Institute, Baltimore, Maryland
Science Contact:
Emily Pass
Center for Astrophysics | Harvard & Smithsonian, Cambridge, Massachusetts
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Last Updated Nov 16, 2023 Editor Andrea Gianopoulos Location Goddard Space Flight Center Related Terms
Astrophysics Astrophysics Division Earth-like Exoplanets Exoplanets Goddard Space Flight Center Hubble Space Telescope Missions Science & Research Science Mission Directorate Terrestrial Exoplanets TESS (Transiting Exoplanet Survey Satellite) The Universe Keep Exploring Discover More Topics From NASA
Hubble Space Telescope
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By NASA
Scientists are following neon signs in a search for clues to one planetary system’s future and the past of another – our own solar system. Following up on a peculiar reading by NASA’s previous infrared flagship observatory, the now-retired Spitzer Space Telescope, the agency’s James Webb Space Telescope detected distinct traces of the element neon in the dusty disk surrounding the young Sun-like star SZ Chamaelontis (SZ Cha).
Image: SZ Chamaeleontis Protoplanetary Disk (Artist Concept )
In this artist concept, the young star SZ Chamaeleontis (SZ Cha) is surrounded by a disk of dust and gas with the potential to form a planetary system. Once our solar system looked something like this, before planets, moons, and asteroids formed. The raw ingredients, including those for life on Earth, were present in the Sun’s protoplanetary disk. SZ Cha emits radiation in multiple wavelengths which are evaporating the disk. Planets are in a race against time to form before the disk of material is evaporated completely. NASA’s James Webb Space Telescope observed typical conditions in the disk – it was being bombarded primarily by X-rays. However, when NASA’s Spitzer Space Telescope observed the disk in 2008, it saw a different scene, dominated by extreme ultraviolet (EUV) light, indicated by the presence of a specific type of neon in the disk. These differences are significant because planets would have more time to form from a disk dominated by EUV. Astronomers are investigating the cause of the difference between Webb and Spitzer’s readings, and think it may be due to the presence (or not) of a strong wind that, when active, absorbs EUV, leaving X-rays to hit the disk.NASA, ESA, CSA, Ralf Crawford (STScI) Differences in the neon readings between Spitzer and Webb point to a never-before-observed change in high-energy radiation that reaches the disk, which eventually causes it to evaporate, limiting the time planets have to form.
“How did we get here? It really goes back to that big question, and SZ Cha is the same type of young star, a T-Tauri star, as our Sun was 4.5 billion years ago at the dawn of the solar system,” said astronomer Catherine Espaillat of Boston University, in Massachusetts, who led both the 2008 Spitzer observations and the newly published Webb results. “The raw materials for Earth, and eventually life, were present in the disk of material that surrounded the Sun after it formed, and so studying these other young systems is as close as we can get to going back in time to see how our own story began.”
Scientists use neon as an indicator of how much, and what type, of radiation is hitting and eroding the disk around a star. When Spitzer observed SZ Cha in 2008, it saw an outlier, with neon readings unlike any other young T-Tauri disk. The difference was the detection of neon III, which is typically scarce in protoplanetary disks that are being pummeled by high-energy X-rays. This meant that the high-energy radiation in the SZ Cha disk was coming from ultraviolet (UV) light instead of X-rays. Besides being the lone oddball result in a sample of 50-60 young stellar disks, the UV vs. X-ray difference is significant for the lifetime of the disk and its potential planets.
Image: Neon Gas In Protoplanetary Disk
Contrasting data from NASA’s James Webb and Spitzer space telescopes show change in the disk surrounding the star SZ Chamaeleontis (SZ Cha) in just 15 years. In 2008, Spitzer’s detection of significant neon III made SZ Cha an outlier among similar young protoplanetary disks. However, when Webb followed up on SZ Cha in 2023, the ratio of neon II to III was within typical levels. All of this is significant because protoplanetary disks are the stuff of future planetary systems – and those potential planets are in a race against time. Astronomers use neon as an indicator of the dominant radiation hitting the disk and causing it to evaporate. When extreme ultraviolet light is dominant, there is more neon III. That is the unusual circumstance that Spitzer observed in 2008. Typically, a disk is dominated by X-ray radiation, which evaporates the disk more quickly, leaving planets less time to form. Researchers think the dramatic differences in neon detections are the result of a wind that, when present, absorbs ultraviolet light and leaves X-rays to pummel the disk. They will continue using Webb to find other examples of variability in disk conditions, working toward a better understanding of how planetary systems develop around Sun-like stars.NASA, ESA, CSA, Ralf Crawford (STScI) “Planets are essentially in a race against time to form up in the disk before it evaporates,” explained Thanawuth Thanathibodee of Boston University, another astronomer on the research team. “In computer models of developing systems, extreme ultraviolet radiation allows for 1 million more years of planet formation than if the evaporation is predominately caused by X-rays.”
So, SZ Cha was already quite the puzzle when Espaillat’s team returned to study it with Webb, only to find a new surprise: The unusual neon III signature had all but disappeared, indicating the typical dominance of X-ray radiation.
The research team thinks that the differences in neon signatures in the SZ Cha system are the result of a variable wind that, when present, absorbs UV light and leaves X-rays to pummel the disk. Winds are common in a system with a newly formed, energetic star, the team says, but it is possible to catch the system during a quiet, wind-free period, which is what Spitzer happened to do.
“Both the Spitzer and Webb data are excellent, so we knew this had to be something new we were observing in the SZ Cha system – a significant change in conditions in just 15 years,” added co-author Ardjan Sturm of Leiden University, Leiden, Netherlands.
Espaillat’s team is already planning more observations of SZ Cha with Webb, as well as other telescopes, to get to the bottom of its mysteries. “It will be important to study SZ Cha, and other young systems, in multiple wavelengths of light, like X-ray and visible light, to discover the true nature of this variability we’ve found,” said co-author Caeley Pittman of Boston University. “It’s possible that brief, quiet periods dominated by extreme UV radiation are common in many young planetary systems, but we just have not been able to catch them.”
“Once again, the universe is showing us that none of its methods are as simple as we might like to make them. We need to rethink, re-observe, and gather more information. We’ll be following the neon signs,” said Espaillat.
This research has been accepted for publication in Astrophysical Journal Letters.
The James Webb Space Telescope is the world’s premier space science observatory. Webb is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and the Canadian Space Agency.
Media Contacts
Laura Betz – laura.e.betz@nasa.gov, Rob Gutro– rob.gutro@nasa.gov
NASA’s Goddard Space Flight Center, , Greenbelt, Md.
Leah Ramsay lramsay@stsci.edu , Christine Pulliam cpulliam@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
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Download full resolution images for this article from the Space Telescope Science Institute.
Research results have been accepted for publication in Astropyisical Journal Letters.
Related Information
How do Planets Form? https://exoplanets.nasa.gov/faq/43/how-do-planets-form/
Planetary Systems – https://universe.nasa.gov/stars/planetary-systems/
Webb Mission – https://science.nasa.gov/mission/webb/
Webb News – https://science.nasa.gov/mission/webb/latestnews/
Webb Images – https://science.nasa.gov/mission/webb/multimedia/images/
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Last Updated Nov 15, 2023 Editor Steve Sabia Contact Related Terms
Exoplanets Goddard Space Flight Center James Webb Space Telescope (JWST) Planets View the full article
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By USH
In 2003, an unidentified flying object, comparable in size to a football field, reportedly hovered over Vandenberg Air Force Base, as disclosed during a House Oversight Committee's national security subcommittee hearing on UFOs. The hearing, held on Wednesday, delved into UFOs, now termed "unidentified anomalous phenomena" by the U.S. government.
The proceedings included whistleblower accounts that shed light on purported government UFO programs spanning multiple decades, according to retired major David Grusch. Former Navy fighter jet pilot Ryan Graves, founder of the non-profit Americans for Safe Aerospace, presented testimony regarding the alleged UFO sighting at Vandenberg.
During questioning by Representative Anna Paulina Luna, Graves recounted the 2003 incident: "In the 2003 timeframe, a sizable group of Boeing contractors near a launch facility at Vandenberg observed a large, 100-yard-sided red square approaching from the ocean. It hovered at low altitude over the launch facility for about 45 seconds before rapidly darting off over the mountains around 8:45 a.m."
Graves further described a subsequent event 24 hours later, involving additional sightings on the base, with some objects displaying aggressive behavior toward security guards. The information, according to Graves, came from a witness who approached him at Americans for Safe Aerospace, and this witness possessed documented police blotter and records from the 2003 incidents.
Testimonies from former Major Grusch and ex-U.S. intelligence officer David Fravor were also part of the hearing, although they refrained from answering certain questions. Representative Tim Burchett emphasized the importance of government transparency in addressing the issue, clarifying that the aim was to uncover facts without sensationalizing the subject.
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