Search Publications
Assessing the capability of a model-based stellar XUV estimation
Namekata, Kosuke; Takasao, Shinsuke; Shoda, Munehito
Stellar X-ray and extreme ultraviolet (XUV) emission drives the heating and chemical reactions in planetary atmospheres and proto-planetary disks, and therefore, a proper estimation of a stellar XUV spectrum is required for their studies. One proposed solution is to estimate stellar atmospheric heating using numerical models, although the validati…
BASS: XLIII. Optical, UV, and X-ray emission properties of unobscured Swift/BAT active galactic nuclei
Ueda, Yoshihiro; Kawamuro, Taiki; Ricci, Claudio +19 more
We present one of the largest multiwavelength studies of simultaneous optical-to-X-ray spectral energy distributions (SEDs) of unobscured (NH < 1022 cm‑2) active galactic nuclei (AGN) in the local Universe. Using a representative sample of hard-X-ray-selected AGN from the 70-month Swift/BAT catalog, with optical…
Chemical Evolution of R-process Elements in Stars (CERES): II. The impact of stellar evolution and rotation on light and heavy elements
Hansen, Camilla Juul; Meynet, Georges; Romano, Donatella +4 more
Context. Carbon, nitrogen, and oxygen are the most abundant elements throughout the universe, after hydrogen and helium. Studying these elements in low-metallicity stars can provide crucial information on the chemical composition in the early Galaxy and possible internal mixing processes that can alter the surface composition of the stars. Aims. T…
Where do they come from?. Identification of escaped globular cluster stars
Tian, Hao; Huang, Yang; Wang, Long +5 more
Globular clusters (GCs), as old as our Galaxy, constantly lose their members to the field as they cross through the Milky Way (MW). These escaped GC stars (or escapees) are thought to contribute significantly to the MW halo. If a star left the host GC a long time ago, chemical finger prints (e.g., N enrichment) may reveal its origin. In this work …
Probing Na in giant exoplanets with ESPRESSO and 3D NLTE stellar spectra
Pallé, E.; Stangret, M.; Lind, K. +3 more
Context. Neutral sodium was the first atom that was detected in an exoplanetary atmosphere using the transmission spectroscopy technique. To date, it remains the most successfully detected species due to its strong doublet in the optical at 5890 Å and 5896 Å. However, the center-to-limb variation (CLV) of these lines in the host star can bias the …
A 260 pc resolution ALMA map of HCN(1–0) in the galaxy NGC 4321
Henshaw, Jonathan D.; Rosolowsky, Erik; Chevance, Mélanie +24 more
The property of star formation rate (SFR) is tightly connected to the amount of dense gas in molecular clouds. However, it is not fully understood how the relationship between dense molecular gas and star formation varies within galaxies and in different morphological environments. Most previous studies have typically been limited to kiloparsec-sc…
Tidal tails of open clusters
Kos, Janez
Context. Open clusters that emerged from the star-forming regions as gravitationally bound structures are subjected to star evaporation, ejection, and tidal forces throughout the rest of their lives. Consequently, they form tidal tails that can stretch kiloparsecs along the cluster's orbit. Aims. Cluster members are typically found by searching fo…
The treasure behind the haystack: MUSE analysis of five recently discovered globular clusters
Fabbro, S.; Zoccali, M.; Rojas-Arriagada, A. +10 more
Context. After the second data release of Gaia, the number of new globular cluster candidates has increased significantly. However, most of them need to be properly characterised, both spectroscopically and photometrically, by means of radial velocities, metallicities, and deeper photometric observations.
Aims: Our goal is to provide an indep…
Euclid preparation: XLVI. The near-infrared background dipole experiment with Euclid
Altieri, B.; Cimatti, A.; Baccigalupi, C. +217 more
Verifying the fully kinematic nature of the long-known cosmic microwave background (CMB) dipole is of fundamental importance in cosmology. In the standard cosmological model with the Friedman–Lemaitre–Robertson–Walker (FLRW) metric from the inflationary expansion, the CMB dipole should be entirely kinematic. Any non-kinematic CMB dipole component …
Exploring the dynamical evolution of Cepheid multiplicity in star clusters and its implications for B-star multiplicity at birth
Anderson, Richard I.; Kroupa, Pavel; Dinnbier, František
Context. Classical Cepheid variable stars provide a unique probe of binary evolution in intermediate-mass stars over the course of several tens to hundreds of Myr. In addition, understanding binary evolution with the inclusion of cluster dynamics is desirable for obtaining a more complete picture of these stars, especially as they play a vital rol…