S. Sciortino
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View article: EWOCS-IV: 1Ms ACIS <i>Chandra</i> observation of the supergiant B[e] star Wd1-9
EWOCS-IV: 1Ms ACIS <i>Chandra</i> observation of the supergiant B[e] star Wd1-9 Open
Context . Supergiant B[e] (sgB[e]) stars are exceptionally rare objects, with only a select number of confirmed examples in the Milky Way. The evolutionary pathways leading to the sgB[e] phase remain largely debated, highlighting the need …
View article: The X-ray Integral Field Unit at the end of the Athena reformulation phase
The X-ray Integral Field Unit at the end of the Athena reformulation phase Open
The Athena mission entered a redefinition phase in July 2022, driven by the imperative to reduce the mission cost at completion for the European Space Agency below an acceptable target, while maintaining the flagship nature of its science …
View article: EWOCS-III: JWST observations of the supermassive star cluster Westerlund 1
EWOCS-III: JWST observations of the supermassive star cluster Westerlund 1 Open
The typically large distances, extinction, and crowding of Galactic supermassive star clusters have so far hampered the identification of their very low mass members, required to extend our understanding of star and planet formation, and e…
View article: EWOCS-III: JWST observations of the supermassive star cluster Westerlund 1
EWOCS-III: JWST observations of the supermassive star cluster Westerlund 1 Open
Context . The typically large distances, extinction, and crowding of Galactic supermassive star clusters (stellar clusters more massive than 10 4 M ⊙ ) have so far hampered the identification of their very low mass members, required to ext…
View article: EWOCS-II: X-ray properties of the Wolf–Rayet stars in the young Galactic super star cluster Westerlund 1
EWOCS-II: X-ray properties of the Wolf–Rayet stars in the young Galactic super star cluster Westerlund 1 Open
Context. Wolf–Rayet (WR) stars are massive evolved stars that exhibit particularly fast and dense stellar winds. Although they constitute a very short phase near the end of a massive star’s life, they play a crucial role in the evolution o…
View article: EWOCS-II: X-ray properties of the Wolf-Rayet stars in the young Galactic super star cluster Westerlund 1
EWOCS-II: X-ray properties of the Wolf-Rayet stars in the young Galactic super star cluster Westerlund 1 Open
We present the most comprehensive and deepest X-ray study to date of the properties of the richest Wolf-Rayet (WR) population observed in a single stellar cluster, Westerlund 1 (Wd1). This work is based on 36 Chandra observations obtained …
View article: EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Westerlund 1 and 2 Open Clusters Survey
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Westerlund 1 and 2 Open Clusters Survey Open
Context . With a mass exceeding several 10 4 M ⊙ and a rich and dense population of massive stars, supermassive young star clusters represent the most massive star-forming environment that is dominated by the feedback from massive stars an…
View article: Breakthroughs in Cool Star Physics with the Line Emission Mapper X-ray Probe
Breakthroughs in Cool Star Physics with the Line Emission Mapper X-ray Probe Open
We outline some of the highlights of the scientific case for the advancement of stellar high energy physics using the Line Emission Mapper X-ray Probe ({\it LEM}). The key to advancements with LEM lie in its large effective area -- up to 1…
View article: Classification of Chandra X-Ray Sources in Cygnus OB2
Classification of Chandra X-Ray Sources in Cygnus OB2 Open
We have devised a predominantly Naive Bayes−based method to classify X-ray sources detected by Chandra in the Cygnus OB2 association into members, foreground objects, and background objects. We employ a variety of X-ray, optical, and infra…
View article: X-Ray Spectral Characterization of the Young Cygnus OB2 Population
X-Ray Spectral Characterization of the Young Cygnus OB2 Population Open
We analyze the X-ray spectra of the ∼8000 sources detected in the Cygnus OB2 Chandra Legacy Survey (this focus issue), with the goals of characterizing the coronal plasma of the young low-mass stars in the region and estimating their intri…
View article: Diffuse X-Ray Emission in the Cygnus OB2 Association
Diffuse X-Ray Emission in the Cygnus OB2 Association Open
We present a large-scale study of diffuse X-ray emission in the nearby massive stellar association Cygnus OB2 as part of the Chandra Cygnus OB2 Legacy Program. We used 40 Chandra X-ray ACIS-I observations covering ∼1.0 deg 2 . After removi…
View article: Photoevaporation and Close Encounters: How the Environment around Cygnus OB2 Affects the Evolution of Protoplanetary Disks
Photoevaporation and Close Encounters: How the Environment around Cygnus OB2 Affects the Evolution of Protoplanetary Disks Open
In our Galaxy, star formation occurs in a variety of environments, with a large fraction of stars formed in clusters hosting massive stars. OB stars have an important feedback on the evolution of protoplanetary disks orbiting around nearby…
View article: Classification of Chandra X-ray Sources in Cygnus OB2
Classification of Chandra X-ray Sources in Cygnus OB2 Open
We have devised a predominantly Naive Bayes method to classify the optical/IR matches to X-ray sources detected by Chandra in the Cygnus OB2 association into foreground, member, and background objects. We employ a variety of X-ray, optical…
View article: Spatial and dynamical structure of the NGC 2264 star-forming region
Spatial and dynamical structure of the NGC 2264 star-forming region Open
Context. The formation of stars within molecular clouds and the early stages of stellar evolution (e.g., mass accretion and disk dispersal) are all active research topics. The target of this study, NGC 2264, is a benchmark star-forming reg…
View article: The Athena X-ray Integral Field Unit: a consolidated design for the system requirement review of the preliminary definition phase
The Athena X-ray Integral Field Unit: a consolidated design for the system requirement review of the preliminary definition phase Open
The Athena X-ray Integral Unit (X-IFU) is the high resolution X-ray spectrometer, studied since 2015 for flying in the mid-30s on the Athena space X-ray Observatory, a versatile observatory designed to address the Hot and Energetic Univers…
View article: Low-mass young stars in the Milky Way unveiled by DBSCAN and <i>Gaia</i> EDR3: Mapping the star forming regions within 1.5 kpc
Low-mass young stars in the Milky Way unveiled by DBSCAN and <i>Gaia</i> EDR3: Mapping the star forming regions within 1.5 kpc Open
Context. With an unprecedented astrometric and photometric data precision, Gaia EDR3 provides, for the first time, the opportunity to systematically detect and map, in the optical bands, the low-mass populations of the star forming regions…
View article: X-ray variability of HD 189733 across eight years of <i>XMM-Newton</i> observations
X-ray variability of HD 189733 across eight years of <i>XMM-Newton</i> observations Open
The characterization of exoplanets, their formation, evolution, and chemical changes is tightly linked to our knowledge of their host stars. In particular, stellar X-rays and UV emission have a strong impact on the dynamical and chemical e…
View article: The Voyage of Metals in the Universe from Cosmological to Planetary Scales: the need for a Very High-Resolution, High Throughput Soft X-ray Spectrometer
The Voyage of Metals in the Universe from Cosmological to Planetary Scales: the need for a Very High-Resolution, High Throughput Soft X-ray Spectrometer Open
Metals form an essential part of the Universe at all scales. Without metals we would not exist, and the Universe would look completely different. Metals are primarily produced via nuclear processes in stars, and spread out through winds or…
View article: CSI 2264: Simultaneous optical and X-ray variability in the pre-main sequence stars of NGC 2264
CSI 2264: Simultaneous optical and X-ray variability in the pre-main sequence stars of NGC 2264 Open
Context . Pre-main sequence stars are variable sources. In diskless stars this variability is mainly due to the rotational modulation of dark photospheric spots and active regions, as in main sequence stars even if associated with a strong…
View article: CSI2264: Simultaneous optical and X-ray variability in the pre-main sequence stars of NGC2264. II: Photometric variability, magnetic activity, and rotation in classIII objects and stars with transition disks
CSI2264: Simultaneous optical and X-ray variability in the pre-main sequence stars of NGC2264. II: Photometric variability, magnetic activity, and rotation in classIII objects and stars with transition disks Open
Pre-main sequence stars are variable sources. In diskless stars this variability is mainly due to the rotational modulation of dark photospheric spots and active regions, as in main sequence stars even if associated with a stronger magneti…
View article: X-ray Studies of Exoplanets: A 2020 Decadal Survey White Paper
X-ray Studies of Exoplanets: A 2020 Decadal Survey White Paper Open
Over the last two decades, the discovery of exoplanets has fundamentally changed our perception of the universe and humanity's place within it. Recent work indicates that a solar system's X-ray and high energy particle environment is of fu…
View article: High-Energy Photon and Particle Effects onExoplanet Atmospheres and Habitability
High-Energy Photon and Particle Effects onExoplanet Atmospheres and Habitability Open
It is now recognized that energetic stellar photon and particle radiation evaporates and erodes planetary atmospheres and controls upper atmospheric chemistry. Key exoplanet host stars will be too faint at X-ray wavelengths for accurate ch…
View article: Simultaneous Kepler/K2 and XMM‐Newton observations of superflares in the Pleiades
Simultaneous Kepler/K2 and XMM‐Newton observations of superflares in the Pleiades Open
Together with coronal mass ejection, flares are the most energetic stellar magnetic events, ignited by a sudden release of magnetic energy, which triggers a cascade of interconnected phenomena, each resulting in emission in different bands…
View article: Young Stars and their Variability with LSST
Young Stars and their Variability with LSST Open
Young stars exhibit short-term photometric variability caused by mass accretion events from circumstellar disks, the presence of dusty warps within the inner disks, starspots that rotate across the stellar surfaces, and flares. Long-term v…
View article: Investigating the population of Galactic star formation regions and star clusters within a Wide-Fast-Deep Coverage of the Galactic Plane
Investigating the population of Galactic star formation regions and star clusters within a Wide-Fast-Deep Coverage of the Galactic Plane Open
One of the aims of LSST is to perform a systematic survey of star clusters and star forming regions (SFRs) in our Galaxy. In particular, the observations obtained with LSST will make a big difference in Galactic regions that have been poor…
View article: Photoevaporation and close encounters: how the environment around Cygnus~OB2 affects the evolution of protoplanetary disks
Photoevaporation and close encounters: how the environment around Cygnus~OB2 affects the evolution of protoplanetary disks Open
Cygnus OB2 is the most massive stellar association within 2 kpc from the Sun. Given its large content of massive stars, counting tens of O and 3 WR stars, and thousands of young low mass stars, Cygnus OB2 is the best target to study how ma…