Search Publications
The nature of hyperluminous infrared galaxies
Małek, K.; Wang, L.; Farrah, D. +7 more
Context. Hyperluminous infrared galaxies (HLIRGs) are shown to have been more abundant in early epochs. The small samples used in earlier studies are not sufficient to draw robust statistical conclusions regarding the physical properties and the power sources of these extreme infrared (IR) bright galaxies.
Aims: We make use of multi-wavelengt…
The Cusp–Core Problem in Gas-Poor Dwarf Spheroidal Galaxies
Boldrini, Pierre
This review deals with the inconsistency of inner dark matter density profiles in dwarf galaxies, known as the cusp–core problem. In particular, we aim to focus on gas-poor dwarf galaxies. One of the most promising solutions to this cold dark matter small-scale issue is the stellar feedback, but it seems to be only designed for gas-rich dwarfs. Ho…
Abell 1430: A merging cluster with exceptional diffuse radio emission
Brunetti, G.; Rossetti, M.; Shimwell, T. W. +16 more
Context. Diffuse radio emission has been found in many galaxy clusters, predominantly in massive systems which are in the state of merging. The radio emission can usually be classified as relic or halo emission, which are believed to be related to merger shocks or volume-filling turbulence, respectively. Recent observations have revealed radio bri…
ATOMIUM: The astounding complexity of the near circumstellar environment of the M-type AGB star R Hydrae. I. Morpho-kinematical interpretation of CO and SiO emission
Kervella, Pierre; Decin, Leen; Montargès, Miguel +36 more
Evolved low- to intermediate-mass stars are known to shed their gaseous envelope into a large, dusty, molecule-rich circumstellar nebula which typically develops a high degree of structural complexity. Most of the large-scale, spatially correlated structures in the nebula are thought to originate from the interaction of the stellar wind with a com…
Hierarchically modelling Kepler dwarfs and subgiants to improve inference of stellar properties with asteroseismology
Chaplin, William J.; Davies, Guy R.; Huber, Daniel +9 more
With recent advances in modelling stars using high-precision asteroseismology, the systematic effects associated with our assumptions of stellar helium abundance (Y) and the mixing-length theory parameter (αMLT) are becoming more important. We apply a new method to improve the inference of stellar parameters for a sample of Kepler dwarf…
Dust observations from Parker Solar Probe: dust ejection from the inner Solar System
Czechowski, A.; Mann, I.
Context. The FIELDS instrument onboard Parker Solar Probe (PSP) observes dust impacts on the spacecraft. The derived dust flux rates suggest that the particles originate from the vicinities of the Sun and are ejected by radiation pressure. Radiation pressure typically ejects particles of several 100 nm and smaller, which are also affected by the e…
New measurements of the cyclotron line energy in Cen X-3
Paul, Biswajit; Pradhan, Pragati; Tomar, Gunjan
We report results from the analysis of data from two observations of the accreting binary X-ray pulsar Cen X-3 carried out with the broad-band X-ray observatories Suzaku and NuSTAR. The pulse profile is dominated by a broad single peak and show some energy dependence with two additional weak pulse peaks at energies below 15 and 25 keV, respectivel…
Jupiter's Great Red Spot: Strong Interactions With Incoming Anticyclones in 2019
Hansen, C. J.; Hueso, R.; Sánchez-Lavega, A. +19 more
Jupiter's Great Red Spot (GRS), a giant anticyclone, is the largest and longest lived of all the vortices observed in planetary atmospheres. During its history, the GRS has shrunk to half its size since 1879, and encountered many smaller anticyclones and other dynamical features that interacted in a complex way. In 2018-2020, while having a histor…
Photometric and Spectroscopic Analysis of Four Contact Binaries
Joshi, Y. C.; Panchal, A.
We present the photometric and spectroscopic analysis of four W UMa binaries J015829.5+260333 (hereinafter as J0158), J030505.1+293443 (hereinafter as J0305), J102211.7+310022 (hereinafter as J1022), and KW Psc. The VRcIc band photometric observations are carried out with the 1.3 m Devasthal Fast Optical Telescope (DFOT). For…
Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars
Hutter, D. J.; Tycner, C.; Zavala, R. T. +3 more
We present the results of a multiplicity survey for a magnitude-limited sample of 31 classical Be stars conducted with the Navy Precision Optical Interferometer and the Mark III Stellar Interferometer. The interferometric observations were used to detect companions in 10 previously known binary systems. For two of these sources (66 Oph and β Cep) …