Category: Ricerca

Three super-Earth for a star. The study “Masses and radii for the three super-Earths orbiting GJ 9827, and implications for the composition of small exoplanets” of K. Rice (University of Edinburgh) published by MNRAS

Ricerca

Super-Earths are exoplanets with radii between that of the Earth and that of Neptune (about 4 times the radius of the Earth), and with orbital periods smaller than 100 days. Although the Solar System does not host a similar planet, super-Earths are actually common in the Milky Way. This type of exoplanet is also interesting since they populate a gap

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Giants planets and stellar metallicity. The study “The GAPS Programme with HARPS-N at TNG XVIII. Two new giant planets around the metal-poor stars HD 220197 and HD 233832” of D. Barbato (UNITO/INAF-OATO) published by A&A

Ricerca

One of the products of the star formation process are disks of gas and dust that orbit young stars during their early evolution, being dispersed by several mechanisms in less than 10 million years. These disks are called “protoplanetary disks”, since they are the structures that may evolve in planetary systems. Planet formation is a complex process that involve several

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Shock e riscaldamento degli ioni in ambienti astrofisici. Pubblicato su Nature Astronomy lo studio “Collisionless shock heating of heavy ions in SN 1987A” di M. Miceli (UNIPA/OAPA)

Ricerca

Gli shock sono onde d’urto che viaggiano a velocità supersonica e sono molto importanti in astrofisica perché vengono osservati su diverse scale spaziali ed in diversi contesti, dal nostro “piccolo” sistema solare, fino a scale extragalattiche e cosmologiche. Gli shock astrofisici differiscono da quelli osservabili sulla Terra perché si manifestano in condizioni estreme, non riproducibili sul nostro pianeta.  Mentre nell’atmosfera

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Two LSST white paper are led by INAF-OAPA astronomers

Ricerca

LSST (Large Synoptic Survey Telescope) is the future of the astronomy in the time domain. LSST is a new-generation telescope that will be built on Cerro Pachon in Chile (2700 meters). It will be equipped with a primary mirror of 8.4 meters of diameter and an innovative camera able to observe an very large field of view, more than 49

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Multi-band observations of stellar flares. the study: “A multi-wavelength view of magnetic flaring from PMS stars” of E. Flaccomio (Inaf – OAPA) recently published by A&A

Ricerca

Most of the stars, mainly the low mass stars, produce their own magnetic field in their interior. The interaction between the magnetic field and stellar plasma is the cause of phenomena such as photosperic spots, faculae, protuberances, coronal mass ejections, and flares. The study of this activity is important both because it reveals how intense magnetic fields interact with high-temperature

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Radiation and abundances of organic compounds in planets-forming disks. The study: “X-Ray Photo-desorption of H2O:CO:NH3 Circumstellar Ice Analogs: Gas-phase Enrichment” of A. Jiménez-Escobar (Inaf-OAPA) published in ApJ

Ricerca

From the large number of exoplanets discovered by missions such as Kepler and CoRoT, it is clear that the presence of planets is a common feature in stars of our Galaxy. In particular, it has been estimated that on average each low mass star has one planet. Planets formation is thus an ubiquitous phenomenon across the Milky Way. It is

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X-rays from Cygnus. The paper: “X-ray spectral characterization of the young Cygnus OB2 population” of E. Flaccomio (INAF-OAPA) accepted for publication by ApJS

Ricerca

OB associations are objects of great importance, since they contain a rich population of OB stars. Despite their paucity, OB stars have a strong impact on the evolution of their parental clouds, nearby stars, and the whole Galaxy. For instance, their intense UV emission affects the evolution of the parental cloud and the star formation process in it, sometimes triggering

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Artificial Intelligence applied to astrophysics. The paper “ExoGAN: Retrieving Exoplanetary Atmospheres Using Deep Convolutional Generative Adversarial Networks” of T. Zingales (UCL, INAF – OAPA) published on AJ

Ricerca

In the last few years, many space missions and ground-based surveys, discovered more than 4000 exoplanets, especially using the transit and radial velocity methods. These two methods combined, give us a first estimation of the bulk density of the planets. In order to have a deeper understanding on the planetary characteristics and history, we also need to study their atmospheres.

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