Search Publications
Three low-mass companions around aged stars discovered by TESS
Hellier, Coel; Bieryla, Allyson; Latham, David W. +42 more
We report the discovery of three transiting low-mass companions to aged stars: a brown dwarf (TOI-2336b) and two objects near the hydrogen burning mass limit (TOI-1608b and TOI-2521b). These three systems were first identified using data from the Transiting Exoplanet Survey Satellite (TESS). TOI-2336b has a radius of 1.05 ± 0.04 RJ, a m…
Minute-cadence observations of the LAMOST fields with the TMTS - III. Statistical study of the flare stars from the first two years
Shi, Jianrong; Wang, Xiaofeng; Mo, Jun +22 more
Tsinghua University-Ma Huateng Telescopes for Survey (TMTS) aims to detect fast-evolving transients in the Universe, which has led to the discovery of thousands of short-period variables and eclipsing binaries since 2020. In this paper, we present the observed properties of 125 flare stars identified by TMTS within the first two years, with an att…
Chemodynamical properties and ages of metal-poor stars in S-PLUS
Mendes de Oliveira, C.; Placco, V. M.; Beraldo e Silva, L. +10 more
Metal-poor stars are key to our understanding of the early stages of chemical evolution in the Universe. New multifilter surveys, such as the Southern Photometric Local Universe Survey (S-PLUS), are greatly advancing our ability to select low-metallicity stars. In this work, we analyse the chemodynamical properties and ages of 522 metal-poor candi…
On the origin of optical and IR emission lines in star-forming galaxies
Bruzual, Gustavo; Martínez-Paredes, Mariela; Morisset, Christophe +3 more
Combining the CLOUDY photoionization code with updated stellar population synthesis results, we simultaneously model the MIR $\rm{[Ne {}{\small III}]}/\rm{[Ne {}{\small II}]}$ versus $\rm{[O {}{\small IV}]}/\rm{[Ne {}{\small III}]}$, the MIR-FIR $\rm{[Ne {}{\small III}]}/\rm{[Ne {}{\small II}]}$ versus $\rm{[O {}{\small IV}]}/\rm{[O {}{\small III}…
A benchmark study of atomic models for the transition region against quiet Sun observations
Mason, H. E.; Del Zanna, G.; Dufresne, R. P.
The use of the coronal approximation to model line emission from the solar transition region has led to discrepancies with observations over many years, particularly for Li- and Na-like ions. Studies have shown that a number of atomic processes are required to improve the modelling for this region, including the effects of high densities, solar ra…
Dust from evolved stars: a pilot analysis of the AGB to PN transition
Bianchi, S.; Dell'Agli, F.; Ventura, P. +5 more
We present a novel approach to address dust production by low- and intermediate-mass stars. We study the asymptotic giant branch (AGB) phase, during which the formation of dust takes place, from the perspective of post-AGB and planetary nebula (PN) evolutionary stage. Using results from stellar evolution and dust formation modelling, we interpret …
Multiwavelength afterglow emission from bursts associated with magnetar flares and fast radio bursts
Murase, Kohta; Wei, Yujia; Zhang, B. Theodore
Magnetars have been considered as progenitors of magnetar giant flares (MGFs) and fast radio bursts (FRBs). We present detailed studies on afterglow emissions caused by bursts that occur in their wind nebulae and surrounding baryonic ejecta. In particular, following the bursts-in-bubble model, we analytically and numerically calculate spectra and …
Discovery of magnetospheric interactions in the doubly magnetic hot binary ϵ Lupi
Wade, Gregg A.; Biswas, Ayan; Chandra, Poonam +6 more
Magnetic fields are extremely rare in close, hot binaries, with only 1.5 per cent of such systems known to contain a magnetic star. The eccentric ϵ Lupi system stands out in this population as the only close binary in which both stars are known to be magnetic. We report the discovery of strong variable radio emission from ϵ Lupi using the upgraded…
Near-infrared characterization of ultra-diffuse galaxies in Abell 2744 by JWST/NIRISS imaging
Acebron, Ana; Trenti, Michele; Vulcani, Benedetta +10 more
We present a search and characterization of ultra-diffuse galaxies (UDGs) in the Frontier Fields cluster Abell 2744 at $z$ = 0.308. We use JWST/NIRISS F200W observations, acquired as part of the GLASS-JWST Early Release Science programme, aiming to characterize morphologies of cluster UDGs and their diffuse stellar components. A total number of 22…
Spectral analysis of basaltic asteroids observed by the Gaia space mission
Popescu, Marcel; Oszkiewicz, Dagmara; Carry, Benoit +4 more
There is a great deal of scientific interest in characterizing the basaltic asteroids (spectrally classified as V-types), as they are the key to understanding planetesimal formation and evolution in the early Solar system. These have long been recognized as parts of the crusts of fully differentiated planetesimals. Thus, their multiplicity, distri…