Search Publications
Seeds and sequences of element abundances in solar energetic particle events
Reames, Donald V.
Solar energetic particles (SEPs) in the small "impulsive" events, primarily accelerated during magnetic reconnection in solar jets, have strong enhancements of the abundances of increasingly heavy elements. In contrast, the shock acceleration of ambient coronal plasma in most large "gradual" SEP events produces flat or decreasing abundances vs. el…
Close encounters: How stellar flybys shape planet-forming discs
Ménard, François; Price, Daniel J.; Cuello, Nicolás
We review the role of stellar flybys and encounters in shaping planet-forming discs around young stars, based on the published literature on this topic in the last 30 years. Since most stars
Transition disks: the observational revolution from SEDs to imaging
van der Marel, Nienke
Protoplanetary disks surrounding young stars are the birth place of planets. Of particular interest are the transition disks with large inner dust cavities of tens of au, hinting at the presence of massive companions. These cavities were first recognized by a deficit in their Spectral Energy Distribution (SED), later confirmed by millimeter interf…
Spectroscopic properties of stars in young binaries: fundamental data for understanding binary formation and disk evolution
Prato, Lisa
This contribution combines a relatively comprehensive review of the spectroscopic study of the individual component stars and their associated disks in young binary systems, outlines the need for more in-depth studies, and previews the results of a high-spectral and high-angular resolution survey of
Dynamics of young stellar clusters as planet-forming environments
Parker, Richard J.; Reiter, Megan
Most stars and thus most planetary systems do not form in isolation. The larger star-forming environment affects protoplanetary disks in multiple ways: Gravitational interactions with other stars truncate disks and alter the architectures of exoplanet systems; external irradiation from nearby high-mass stars truncates disks and shortens their life…
The SPHERE view of multiple star formation
Gratton, Raffaele; Bonavita, Mariangela; Marzari, Francesco +1 more
While a large fraction of the stars are in multiple systems, our understanding of the processes leading to the formation of these systems is still inadequate. Given the large theoretical uncertainties, observation plays a basic role. Here we discuss the contribution of high contrast imaging, and more specifically of the SPHERE instrument at the ES…
Gamma-ray astrophysics
De Angelis, A.; Mallamaci, M.
High-energy photons are a powerful probe for astrophysics and for fundamental physics in extreme conditions. In recent years, our knowledge of the most violent phenomena in the Universe has impressively progressed thanks to the advent of new detectors for gamma rays, for both ground-based and space-borne observations. This article reviews the pres…
Mutated hybrid inflation on brane and reheating temperature
Ferricha-Alami, M.; Sakhi, Z.; Chakir, H. +1 more
In the mutated hybrid-inflation standard case, the spectral index