Tag: exoplanets

Planets in binary systems. The study: “The HADES RV Programme with HARPS-N@TNG VIII. Gl15A: A multiple wide planetary system sculpted by binary interaction” of M. Pinamonti (INAF-OATo) published on A&A

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In our Galaxy, a large fraction of stars is part of binary systems. For instance, the study of Duquennoy & Mayor (1991) suggests a binary fraction of 57% for solar type stars. A slightly smaller binary fraction is expected for less massive stars. Among pre-Main Sequence stars, several binary systems are known to host a circumbinary disk. These disks are

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A sub-Neptunian planet discovered around a G9 star. Published on MNRAS: “K2-263 b: a 50 d period sub-Neptune with a mass measurement using HARPS-N” of A. Mortier (University of St. Andrews)

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The search of exoplanets relies mainly on two techniques: transits and radial velocity. With the former method exoplanets are revealed thanks to small and periodic dimming of the light of stars when their planets orbit across the stellar disk, producing a small eclipse. The method of radial velocity consists in revealing the oscillations of stars around the center of mass

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The first study in the framework of GIARPS rules out the existence of a hot Jupiter. The study: “Multi-band high resolution spectroscopy rules out the hot Jupiter BD+20 1790b. First data from the GIARPS Commissioning” of I. Carleo (INAF – OAPd) recently published on A&A

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Most of the exoplanets identified so far have been discovered by using two techniques: transits and radial velocity. In particular, radial velocity method consists in detecting the oscillations of stars around the center of mass common with their planetary systems by measuring periodic doppler shifts in high-resolution spectra. The main difficulty with this technique is the fact that stellar activity,

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The orbital inclination of 5 exoplanets is presented in teh study “The GAPS programme with HARPS-N at TNG XVI. Measurement of the Rossiter–McLaughlin effect of transiting planetary systems HAT-P-3, HAT-P-12, HAT-P-22, WASP-39, and WASP-60” of L. Mancini (University of Rome Tor Vergata), recently published by A&A

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The discovery of hot Jupiters (Jupiter-like exoplanets in close orbits) has changed our view of planet formation. It is still debated whether hot Jupiters form in the present-day orbits or they form at large distances from their star and then they migrate inward. (e.g. Maldonado et al. 2018).   Planetary migration can be induced by several effects, mainly interaction between

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ARIEL selected as next M4 mission by the ESA Space Programme Committee

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In the last years the number of known exoplanets has grown quickly thanks to missions such as Kepler and CoRoT and instruments such as HARPS-N, mounted on the Telescopio Nazionale Galileo, which are designed to identify exoplanets with the method of transits or radial velocity. We have understood now that the presence of exoplanets is a common features in stars

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A new super-Earth discovered thanks to Harps-N. The study “HADES RV Programme with HARPS-N at TNG. GJ 3942 b behind dominant activity signals” of M. Perger published by A&A

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The analysis of radial velocity is one of the two main methods used to detect exoplanets. This method consists in measuring the Doppler effect on stellar spectra deriving the velocity component along the line of sight (the radial velocity). If the star has a planet, they both orbit around the common center of mass,  producing periodic oscillations of the osberved

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Pubblicato lo studio “The GAPS Programme with HARPS-N at TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets” di A. S. Bonomo (INAF-OATO)

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di Mario Giuseppe Guarcello    ( segui mguarce)     A guardare il nostro Sistema Solare, sembrerebbe che il destino di un pianeta sia quello di girare attorno la sua stella in un’orbita stabile ed imperturbata. Ma se c’è una cosa che la ricerca sui pianeti extrasolari ci ha insegnato, è che non è affatto così.   Soprattutto nelle sue prime

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Lo studio: “The GAPS Programme with HARPS-N at TNG. XV. A substellar companion around a K giant star identified with quasi-simultaneous HARPS-N and GIANO measurements” di E. González-Álvarez accettato per essere pubblicato su A&A

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di Mario Giuseppe Guarcello    ( segui mguarce)     Il Sistema Solare non rimarrà così in eterno. Tra circa cinque miliardi di anni, quando non potrà più produrre energia bruciando idrogeno, il nostro Sole evolverà dalla fase di sequenza principale alla fase di gigante rossa, aumentando le proprie dimensioni a discapito dei pianeti più vicini ad esso.   Chiaramente è

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June 2017 Research Highlights: GAPS project and the exoplanets science

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Exoplanets research has a wide appeal on the public and the scientific community. This mainly thanks to the results of successful missions such as CoRoT and Kepler, which allowed us to identify to date 3610 exoplanets, with more than 2000 candidates (link). However, the search for exoplanets is only part of this important branch of astrophysics, which faces several important questions still without answer:

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