Dischi protoplanetari in Orion A non mostrano effetti ambientali sulla quantità di materia che accrescono sulla stella centrale I dischi protoplanetari sono strutture a forma di disco osservate attorno a stelle giovani, tipicamente con un’età inferiore ai 10 milioni di anni. Sono oggetti di grande interesse scientifico per vari motivi, principalmente perché rappresentano la struttura in cui si formano
L’abbondanza di elementi chimici pesanti nelle regioni di formazione stellare influenza l’evoluzione delle stelle e dei loro dischi protoplanetari? Nuovi indizi da uno studio sulla regione Sh2-284 Nei primi milioni di anni di vita, le giovani stelle sono spesso circondate da un disco di gas e polveri chiamato “disco protoplanetario”. Come suggerisce il nome, è la struttura da cui
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
Protoplanetary disks are structures of gas and dust that orbit around newly formed stars (referred to as both pre-main-sequence stars and protostars) during their very early evolutionary stages. In fact, they generally disperse in less than 10 million years. Despite their short lifespan, protoplanetary disks play a crucial role. From the perspective of the star, for example, these disks mediate
Today in the Milky Way, star formation typically occurs in low-mass environments. Young star clusters (e.g., younger than 10 million years), in fact, typically have a mass of a few hundred solar masses. Nevertheless, our Galaxy hosts a few very massive star-forming regions that can produce tens to hundreds of thousands of stars, including some of the most massive stars
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
To understand how planets form, it is mandatory to study the evolution of protoplanetary disks, e.g. disks of gas and dust grains orbiting around stars during the first 3-5 million years of their evolution, a that may evolve into planetary systems. In the last years, several observations have been done in order to detect the molecules, mainly organic, in these
At a distance of about 160 light years, the stellar association TW Hydrae is a benchmark for the study of pre-main sequence stars and their protoplanetary disks. Pre-main sequence stars are a few million years old stars, still gravitationally contracting and not powered yet by the thermonuclear reactions. They are often surrounded by disks of dust and gas called “protoplanetary
Pre-Main Sequence stars are young stars (solar type pre-main sequence stars are younger than about 30 million years), that are often observed surrounded by a disc of haas and dust called “protoplanetary discs”. These discs can actively accreting matter onto the central star, with a complex process resulting from a complicated interplay between the gas of the disc and the
