Tag: JWST

“Spectroscopy of Free-Floating Planetary-Mass Objects and their disks with JWST” by B. Damian (University of St Andrews): eight isolated planetary-mass objects caught by the James Webb Space Telescope

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Eight free-floating planetary-mass objects, identified in three star-forming regions, exhibit unique features: signs of ongoing planet formation and silicate-rich clouds in their photospheres.   It was in the year 2000 that we first learned of the possible existence of free-floating planetary-mass objects—not bound to any exoplanetary system—thanks to observations analyzed by two research groups, one from the Institute of Astrophysics

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Cha 1107-7626: The object with the lowest mass known still hosting a protoplanetary disc with active accretion and a rich organic chemistry

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Too small to be a star, too large to be a planet, Cha 1107-7626 is the smallest known isolated object (6–10 Jupiter masses) surrounded by a protoplanetary disk rich in gas and dust, which is still actively accreting gas and hosts organic molecules such as methane and ethylene.   Brown dwarfs are fascinating objects that represent a bridge between stars

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The supernova remnant SN 1987A observed by the James Webb Space Telescope

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The James Webb Space Telescope, the flagship observatory of NASA/ESA/CSA, has turned its gaze toward the supernova remnant SN 1987A, revealing its structure with an unprecedented level of detail.   About 400 years after Kepler supernova, which exploded in 1604, the skies of the southern hemisphere witnessed another supernova relatively close to us. This was SN 1987A, which exploded on

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Filaments in Cas A probe the processes occurred inside the progenitor during the explosion. The paper: “Filamentary ejecta network in Cassiopeia A reveals fingerprints of the supernova explosion mechanism” of S. Orlando (INAF-OAPA) appeared on A&A

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A new theoretical study shows that the filamentary structure observed in the supernova remnant Cassiopeia A (Cas A) is a direct consequence of the processes that occurred in the progenitor star immediately after core collapse.   Supernovae are among the most energetic explosive events in the Universe. Yet, despite their immense brightness, they convert only about 1% of their energy

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A green monster inside Cas A unveils the secrets of its violent phenomena. The study: “The Green Monster Hiding in Front of Cas A: JWST Reveals a Dense and Dusty Circumstellar Structure Pockmarked by Ejecta Interactions” of I. de Looze (Ghent University) recently appeared on ApJL

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There are many lessons about the physics of supernova remnants and progenitor stars that the Cassiopeia A (Cas A) supernova remnant teaches us. For example, we have learned that both the supernova explosion and the mass-loss episodes that characterize the final evolutionary stages of the progenitor star can be highly asymmetric. We have come to understand that supernovae can play

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(Italiano) Un superammasso stellare svelato dal James Webb Space Telescope. L’articolo: “EWOCS-III: JWST observations of the supermassive star cluster Westerlund 1” di M. G. Guarcello (INAF-OAPA) pubblicato su A&A

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The star-forming regions can differ significantly from one another, particularly in terms of the population of massive stars (with masses exceeding about 10 solar masses) and stellar density (defined as the number of stars per unit volume). These aspects can vary drastically from one region to another. Such differences are extremely important, as massive stars create environments dominated by high-energy

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Synthesis of spectra of exoplanetary atmospheres externally irradiated by X/UV radiation. The study: “Signatures of X-ray dominated chemistry in the spectra of exoplanetary atmospheres” of D. Locci (INAF – OAPA) appeared on PSJ

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One of the lessons we have learned after two decades of exoplanetary science, primarily from the diversity of exoplanets discovered to date, is that various properties of exoplanets depend on the characteristics and evolution of their parent stars. Specifically, stellar X-ray and UV radiation can impact the chemical and physical properties of planetary atmospheres. While UV radiation is primarily absorbed

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Two cycles, two programs. The astronomers of the INAF – OAPA will study the star formation in extreme environments wth JWST

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The formation of stars and planets results from the complex interplay of various factors and agents: the collapse of the cloud due to its own gravitational force, its internal turbulence and magnetic effects, the evolution of star clusters formed within, and the interactions among young stars within these clusters, as well as the influence of their radiation on the surrounding

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Completed the Chandra/ACIS-I observations of the starburst cluster Westerlund 1 as part of the EWOCS (Extended Westerlund One Chandra Survey) project.

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The amount of gas that is converted into stars by the star formation process is described by the star formation rate. For instance, in the Milky Way today between 0.7 and 1.5 solar masses of gas are converted into stars each year. However, this a mean value across our Galaxy, since locally clouds can start forming stars at higher rates

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The program “Testing protoplanetary disk evolution and brown dwarf formation in starburst: NIRCAM and MIRI observations of the young cluster Westerlund 1” of M. G. Guarcello (INAF – OAPA) is among the accepted proposals of the JWST Cycle 1

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The James Webb Telescope (JWST) will be the most complex and powerful telescope ever launched into space. Built by a consortium formed by NASA, ESA, and the Canadian Space Agency (CSA), thanks to its primary mirror with a diameter of 6.5 meters (for comparison, the mirror of the Hubble Space Telescope has a diameter of 2.5 meters) and its four

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