Tag: resti di supernova

The magnetic field in SN1987A revealed from radio observations. The study: “Polarized radio emission unveils the structure of the pre-supernova circumstellar magnetic field and the radio emission in SN1987A” of O. Petruk (INAF-OAPA) appeared on A&A

Ricerca

Without any doubts, the supernova remnants SN1987A is the one that taught us more about this class of objects and supernova exposions. Produced by a supernova exploded in the Large Magellanic Cloud on February 23rd 1987, this is the only case in which we have observations of the progenitor, of the supernova explosion, and in which we follow the development

» Read more
, , , , , , ,

Different regimes of particle acceleration in supernova remnants. The study: “A Spatially Resolved Study of Hard X-Ray Emission in Kepler’s Supernova Remnant: Indications of Different Regimes of Particle Acceleration” of V. Sapienza (UNIPA/OAPA) appeared on ApJ

Ricerca

Cosmic rays are high-energy charged particles which continuously hit our planet. These particles are accelerated up to such high velocities in different astronomical environments, among which supernova remnants seems to be particularly important. These objects are nebulae in rapid expansion generated by the explosions of very massive stars. In supernova remnants, particle acceleration seems to occurr along the expanding shock

» Read more
, , , , , , , ,

Supernova explosions can trigger star formation events. The study: “Negative and positive feedback from a supernova remnant with SHREC: a detailed study of the shocked gas in IC443” of G. Cosentino (Chalmers University of Technology) recently appeared on MNRAS

Ricerca

A supernova is the final act of the evolution of a massive star. These spectacular explosions are among the most energetic events we observe in the Universe, and they can seriously impact the surrounding environment. In particular, during the expansions of the supernova remnants, which are the expanding clouds produced by supernova explosions, the process of star formation in the

» Read more
, , , , , ,

Supernova explosions produced by LBV stars. The study: “Modeling the remnants of core-collapse supernovae from luminous blue variable stars” of S. Ustamujic (INAF-OAPA) recently appeared on Astronomy & Astrophysics

Ricerca

LBV (Luminous Blue Variable) stars are massive and unstable stars characterized by large mass-lost due to intense stellar winds and aperiodic bursts. Due to their instability, LBV stars are also variable, with quasi-periodic oscillations of their luminosity of the order of 0.5-2 magnitudes. Typical examples of this class of stars are: the supergiant S Doradus in the Large Magellanic Clouds,

» Read more
, , , , , ,

The role of the magnetic field during the evolution of supernova remnants i. The study: “Magneto-hydrodynamic simulations of young supernova remnants and their energy-conversion phase” of O. Petruk (IAPMM NASU) recently appeared on MNRAS

Ricerca

Supernova explosions are sorted into two categories: The thermonuclear explosions triggered by white dwarfs in close binary systems (type Ia) and those triggered by the gravitational collapse of the core of massive stars (type Ib/c and II). Because of the paucity of known supernova remnants younger than 1000 years, astronomers developed several models describing the evolution of supernova remnants to

» Read more
, , , , , , ,

Jets launched during supernova explosions. The study: “X-ray emitting structures in the Vela SNR: ejecta anisotropies and progenitor stellar wind residuals” of V. Sapienza (UNIPA/OAPA) recently appeared on A&A

Ricerca

Supernova remnants are clouds in rapid expansion formed by supernova explosions. Typically, these remnants are very inhomogeneous. These inhomogeneity is the result of the interaction between the expanding remnant and the surrounding material, and, in particular when they are generated by core-collapse supernova explosions (which are the supernova triggered by the gravitational collapse of the cores of massive stars), also to anisotropies formed

» Read more
, , , , , , ,

The interaction between expanding SNR and surrounding clouds. The study: “Modeling the mixed-morphology supernova remnant IC 443. Origin of its complex morphology and X-ray emission” of S. Ustamujic (INAF-OAPA) accepted on A&A

Ricerca

Supernova remnants are clouds in rapid expansion produced by supernova explosions. They are often characterized by a complex morphology, resulting from the interaction between the expanding remnants and surrounding clouds. Supernova remnants also emit radiation on a wide band of the electromagnetic spectrum. This is due to the variety of phenomena occurring in these objects, and because of the different

» Read more
, , , , ,

MHD simulations connecting supernova explosions and SNR. The study: “Three-dimensional modeling from the onset of the SN to the full-fledged SNR. Role of an initial ejecta anisotropy on matter mixing” of A. Tutone (UNIPA/INAF-OAPA/INAF-IASF) recently appeared on A&A

Ricerca

Supernova explosions, occurring and the end of the life of massive stars, are ruled by a complex physics, and they can not be described by a simple spherically symmetric geometry. The rarity of these events make even more difficult to understand the physical processes involved during the explosions. For instance, on average only one supernova explodes in our Galaxy every

» Read more
, , ,

An aspherical explosion to explain SN 1987 A properties. The study “Matter Mixing in Aspherical Core-collapse Supernovae: Three-dimensional Simulations with Single Star and Binary Merger Progenitor Models for SN 1987A” of M. Ono (Astrophysical Big Bang Laboratory) recently appeared on ApJ

Ricerca

A supernova exploded on 1987 February 23rd in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. Being at a distance of “only” 170000 light years from us, this supernova, named SN 1987 A, is the closest supernova exploded in the modern era, and thus it is a template to understand the physics of supernova explosions and the

» Read more
, , ,

31 years of evolution of a supernova remnant. The study: “3D MHD modeling of the expanding remnant of SN 1987A. Role of magnetic field and non-thermal radio emission” of S. Orlando (INAF-OAPA) recently published by A&A

Ricerca

During the 1987 February 23rd night, astronomers observed the explosion of a supernova in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. The exploded star was the blue supergiant Sanduleak (Sk) − 69o202, with a mass of 20 solar masses, and its explosion produced the supernova remnant SN 1987A. From that moment, SN 1987A was observed with

» Read more
, , , ,
1 2 3