Category: Ricerca

Shedding lights on the mechanism responsible for the formation of Hot Jupiters. The study: “Gas, not dust: Migration of TESS/Gaia hot Jupiters possibly halted by the magnetospheres of protoplanetary disks” of I. Mendigutia (CAB) appeared on A&A

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Hot Jupiters are gas giants that orbit at distances less than 0.1 AU from their host star. But what determines the final orbital radius of these planets? In intermediate-mass stars, it seems to be the dispersion of gas in their protoplanetary disks.   Hot Jupiters are a class of exoplanets that are not found in our Solar System. They are

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Toward a precise description of the interaction between radiation and interstellar dust grains: “Interstellar dust as a dynamic environment” by G. La Mura (INAF-OA Cagliari)

Ricerca

Micrometric dust particles, both in the diffuse interstellar medium and in nebulae, interact with light, giving rise to many important phenomena. This interaction also depends on the shape and microphysics of the dust grains.   A galaxy like ours hosts not only stars, planets, and compact objects, but also dust and gas organized both in a diffuse, extremely low-density medium

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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

Ricerca

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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Mass of the stars and intensity of their flares. The study: “Exploring short-term stellar activity in M dwarfs: A volume-limited perspective” of G. Galletta (UNIPA) appeared on A&A

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A total of 17229 flares were observed and studied in 173 M-type stars located within 33 light-years from Earth. The study reveals that the most energetic flares occur in the least massive stars, while in the more massive ones, variability is dominated by less intense flares.   Magnetic field generation in stars takes place in their interiors, through complex physical processes

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A bipolar explosion shaped SN 1987A. The study: “Tracing the ejecta structure of SN 1987A: Insights and diagnostics from 3D MHD simulations” of S. Orlando (INAF – OAPA) appeared on A&A

Ricerca

Theoretical analysis of the properties of the cloud of stellar fragments (i.e., the ejecta) populating the innermost region of the supernova remnant SN 1987A reveals a highly asymmetric explosion, dominated by two bipolar jets.   The complex physics governing the core collapse of a massive star and the subsequent supernova explosion can be uncovered through detailed analysis of the physical

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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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A young Saturnian planet orbiting a star in the stellar cluster IC 2602 described in the study: “TOI-837 b: Characterisation, formation, and evolutionary history of an infant warm Saturn-mass planet” of M. Damasso (INAF – OATo)

Ricerca

Analysis of TESS and HARPS observations confirms the existence of a Saturn-like planet orbiting a star associated with the young stellar cluster IC 2602   Stellar clusters are not only beautiful objects to photograph and observe through a telescope, but they also represent an important opportunity for studying stellar evolution. In fact, they are composed of rich samples of stars

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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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X-rays from SN1987A: shocks, circumstellar clouds and ionised oxygen described in two recent publications

Ricerca

Analysis of X-ray observations of the SN1987A supernova remnant, obtained by the XMM-Newton satellite, provides new insights into the interaction between the supernova shock wave and the circumstellar material, as well as the oxygen abundance in the remnant.   The SN1987A supernova remnant is undoubtedly one of the most iconic objects for studying supernovae, their remnants, and the final stages

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A system of super-Earth exoplanets orbiting around GJ 3998 described in the paper: “HADES RV Programme with HARPS-N at TNG XVI. A super-Earth in the habitable zone of the GJ 3998 multi-planet system” of A. K. Stefanov (IAC)

Ricerca

At just 60 light-years away from us, the M-type star GJ 3998 hosts a system of three super-Earths, discovered and studied thanks to observations from the Telescopio Nazionale Galileo.   M-type stars are among the most important targets in the search for exoplanets, primarily for two reasons: they are the most numerous stars in our Galaxy, and the most commonly

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