Image: SZ Chamaeleontis Protoplanetary Disk (Artist Concept )<\/h2>\n\n\n\n![\"Looking](\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/11\/stsci-01heqmdd6stharet4yf7vnmrjk.jpg?w=2048\")
<\/figure>\nIn 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\u2019s 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\u2019s James Webb Space Telescope observed typical conditions in the disk \u2013 it was being bombarded primarily by X-rays. However, when NASA\u2019s 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\u2019s 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.<\/div>\nNASA, ESA, CSA, Ralf Crawford (STScI)<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\nDifferences 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.\u00a0<\/p>\n
\u201cHow 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<\/a>, as our Sun was 4.5 billion years ago at the dawn of the solar system,\u201d said astronomer Catherine Espaillat of Boston University, in Massachusetts, who led both the 2008 Spitzer observations and the newly published Webb results<\/a>. \u201cThe 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.\u201d<\/p>\nScientists 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<\/a>, 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.<\/p>\nImage: Neon Gas In Protoplanetary Disk<\/h2>\n\n\n\n![\"Infographic](\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/11\/stsci-01heqmgyyqfbmttv4m0g41p7wp.jpg?w=2048\")
<\/figure>\nContrasting data from NASA\u2019s 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\u2019s 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 \u2013 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.
\nResearchers 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.<\/div>\nNASA, ESA, CSA, Ralf Crawford (STScI)<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n\u201cPlanets are essentially in a race against time to form up in the disk before it evaporates,\u201d explained Thanawuth Thanathibodee of Boston University, another astronomer on the research team. \u201cIn 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.\u201d<\/p>\n
So, SZ Cha was already quite the puzzle when Espaillat\u2019s 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.<\/p>\n
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.<\/p>\n
\u201cBoth the Spitzer and Webb data are excellent, so we knew this had to be something new we were observing in the SZ Cha system \u2013 a significant change in conditions in just 15 years,\u201d added co-author Ardjan Sturm of Leiden University, Leiden, Netherlands.<\/p>\n
Espaillat\u2019s team is already planning more observations<\/a> of SZ Cha with Webb, as well as other telescopes, to get to the bottom of its mysteries. \u201cIt 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\u2019ve found,\u201d said co-author Caeley Pittman of Boston University. \u201cIt\u2019s 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.\u201d<\/p>\n\u201cOnce 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\u2019ll be following the neon signs,\u201d said Espaillat.<\/p>\n
This research has been accepted for publication in Astrophysical Journal Letters<\/a>.<\/p>\nThe James Webb Space Telescope is the world\u2019s 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.<\/em><\/p>\nMedia Contacts<\/h2>\n
Laura\u00a0Betz<\/strong> \u2013 laura.e.betz@nasa.gov<\/a>, Rob Gutro<\/strong>\u2013 rob.gutro@nasa.gov<\/a>
NASA\u2019s \u00a0Goddard Space Flight Center<\/em><\/a>,\u00a0<\/em>, Greenbelt, Md.<\/p>\nLeah Ramsay<\/strong> lramsay@stsci.edu<\/a> , Christine Pulliam<\/strong> cpulliam@stsci.edu<\/a><\/p>\nSpace Telescope Science Institute, Baltimore, Md.<\/p>\n<\/p>\n
Downloads<\/h2>\n
Download full resolution images for this article<\/a><\/strong> from the Space Telescope Science Institute.<\/p>\nResearch results <\/strong><\/a>have been accepted for publication in Astropyisical Journal Letters.<\/p>\n<\/p>\nRelated Information<\/h2>\n
How do Planets Form?<\/a><\/strong> https:\/\/exoplanets.nasa.gov\/faq\/43\/how-do-planets-form\/<\/p>\nPlanetary Systems<\/a><\/strong> \u2013 https:\/\/universe.nasa.gov\/stars\/planetary-systems\/<\/p>\nWebb Mission<\/a><\/strong> \u2013 https:\/\/science.nasa.gov\/mission\/webb\/<\/p>\nWebb News<\/a><\/strong> \u2013 https:\/\/science.nasa.gov\/mission\/webb\/latestnews\/<\/p>\nWebb Images<\/a><\/strong> \u2013 https:\/\/science.nasa.gov\/mission\/webb\/multimedia\/images\/<\/p>\n<\/p>\nRelated For Kids<\/h2>\n
Planet Formation in a Snap (video)<\/a><\/p>\nSpacePlace About Our Solar System and Planets<\/a><\/p>\n<\/p>\nEn Espa\u00f1ol<\/h2>\n
Ciencia de la NASA<\/a><\/p>\nNASA en espa\u00f1ol\u00a0<\/a><\/p>\nSpace Place\u00a0para ni\u00f1os<\/a><\/p>\n\n\n\n\nKeep Exploring<\/div>\nRelated Topics<\/h2>\n<\/p><\/div>\n<\/p><\/div>\n\n\t\t\t\t\t<\/p>\n\n
<\/figure>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.\u00a0<\/p>\n
\u201cHow 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<\/a>, as our Sun was 4.5 billion years ago at the dawn of the solar system,\u201d said astronomer Catherine Espaillat of Boston University, in Massachusetts, who led both the 2008 Spitzer observations and the newly published Webb results<\/a>. \u201cThe 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.\u201d<\/p>\n 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<\/a>, 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.<\/p>\n \u201cPlanets are essentially in a race against time to form up in the disk before it evaporates,\u201d explained Thanawuth Thanathibodee of Boston University, another astronomer on the research team. \u201cIn 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.\u201d<\/p>\n So, SZ Cha was already quite the puzzle when Espaillat\u2019s 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.<\/p>\n 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.<\/p>\n \u201cBoth the Spitzer and Webb data are excellent, so we knew this had to be something new we were observing in the SZ Cha system \u2013 a significant change in conditions in just 15 years,\u201d added co-author Ardjan Sturm of Leiden University, Leiden, Netherlands.<\/p>\n Espaillat\u2019s team is already planning more observations<\/a> of SZ Cha with Webb, as well as other telescopes, to get to the bottom of its mysteries. \u201cIt 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\u2019ve found,\u201d said co-author Caeley Pittman of Boston University. \u201cIt\u2019s 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.\u201d<\/p>\n \u201cOnce 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\u2019ll be following the neon signs,\u201d said Espaillat.<\/p>\n This research has been accepted for publication in Astrophysical Journal Letters<\/a>.<\/p>\n The James Webb Space Telescope is the world\u2019s 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.<\/em><\/p>\n Laura\u00a0Betz<\/strong> \u2013 laura.e.betz@nasa.gov<\/a>, Rob Gutro<\/strong>\u2013 rob.gutro@nasa.gov<\/a> Leah Ramsay<\/strong> lramsay@stsci.edu<\/a> , Christine Pulliam<\/strong> cpulliam@stsci.edu<\/a><\/p>\n Space Telescope Science Institute, Baltimore, Md.<\/p>\n<\/p>\n Download full resolution images for this article<\/a><\/strong> from the Space Telescope Science Institute.<\/p>\n Research results <\/strong><\/a>have been accepted for publication in Astropyisical Journal Letters.<\/p>\n<\/p>\n How do Planets Form?<\/a><\/strong> https:\/\/exoplanets.nasa.gov\/faq\/43\/how-do-planets-form\/<\/p>\n Planetary Systems<\/a><\/strong> \u2013 https:\/\/universe.nasa.gov\/stars\/planetary-systems\/<\/p>\n Webb Mission<\/a><\/strong> \u2013 https:\/\/science.nasa.gov\/mission\/webb\/<\/p>\n Webb News<\/a><\/strong> \u2013 https:\/\/science.nasa.gov\/mission\/webb\/latestnews\/<\/p>\n Webb Images<\/a><\/strong> \u2013 https:\/\/science.nasa.gov\/mission\/webb\/multimedia\/images\/<\/p>\n<\/p>\n Planet Formation in a Snap (video)<\/a><\/p>\n SpacePlace About Our Solar System and Planets<\/a><\/p>\n<\/p>\n Ciencia de la NASA<\/a><\/p>\n NASA en espa\u00f1ol\u00a0<\/a><\/p>\n Space Place\u00a0para ni\u00f1os<\/a><\/p>\nImage: Neon Gas In Protoplanetary Disk<\/h2>\n
<\/figure>
\nResearchers 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.<\/div>\nMedia Contacts<\/h2>\n
NASA\u2019s \u00a0Goddard Space Flight Center<\/em><\/a>,\u00a0<\/em>, Greenbelt, Md.<\/p>\nDownloads<\/h2>\n
Related Information<\/h2>\n
Related For Kids<\/h2>\n
En Espa\u00f1ol<\/h2>\n
Related Topics<\/h2>\n<\/p><\/div>\n<\/p><\/div>\n