Search Publications
The GAPS Programme at TNG: LIX. Characterisation study of the ∼300 Myr-old multi-planetary system orbiting the star BD+40 2790 (TOI-2076)
Baratella, M.; Béjar, V. J. S.; Zapatero Osorio, M. R. +35 more
Context. The long-term Global Architecture of Planetary Systems (GAPS) programme has been characterising a sample of young systems with transiting planets via spectroscopic and photometric follow-up observations. One of the main goals of GAPS is measuring planets' dynamical masses and bulk densities to help build a picture of how planets evolve in…
Comprehensive X-ray and multiwavelength study of ULXs in NGC 1566
Allak, Sinan
This paper presents a comprehensive X-ray and multiwavelength study of ultraluminous X-ray sources (ULXs) in NGC 1566 using archival Chandra, Swift/XRT, JWST, and HST observations. The main results are, first, from the hardness ratio diagram, where spectral state transitions from hard to soft as seen in typical Galactic high-mass X-ray binaries fo…
Expansion kinematics of young clusters: I. Lambda Ori
Tan, Jonathan C.; Armstrong, Joseph J.
Context. Most stars form in clusters or associations, but only a small number of these groups are expected to remain bound for longer than a few megayears. Once star formation has ended and the molecular gas around young stellar objects has been expelled via feedback processes, most initially bound young clusters lose the majority of their binding…
Soft X-ray emission from the classical nova AT 2018bej
Werner, K.; Santangelo, A.; Ducci, L. +4 more
Context. Classical novae are known to demonstrate a supersoft X-ray source (SSS) state following outbursts. This state is associated with residual thermonuclear burning on the white dwarf (WD) surface. During its all-sky survey (eRASS1), the eROSITA telescope on board the Spectrum-Roentgen-Gamma observatory discovered a bright new SSS, whose posit…
Gaps in the Main-Sequence of Star Cluster Hertzsprung-Russell Diagrams
Priya, Hasan
The presence of gaps or regions of small numbers of stars in the main sequence of the Hertzsprung-Russell Diagram (HRD) of star clusters has been reported in literature. This is interesting and significant as it could be related to star formation and/or rapid evolution or instabilities. In this paper, using Gaia DR3 photometry and confirmed member…
The grazing-angle icy protoplanetary disk PDS 453
Pinte, C.; Ménard, F.; Duchêne, G. +13 more
Context. Observations of highly inclined protoplanetary disks provide a different point of view, in particular, they provide a more direct access to the vertical disk structure when compared to less steeply inclined more pole-on disks. Aims. PDS 453 is a rare highly inclined disk where the stellar photosphere is seen at grazing incidence on the di…
Asphericity of the Base of the Solar Convection Zone
Basu, Sarbani; Korzennik, Sylvain G.
We have used solar oscillation frequencies and frequency splittings obtained over solar cycles 23 and 24 to investigate whether the base of the solar convection zone shows any departure from spherical symmetry. We used the even-order splitting coefficients, a 2–a 8, and estimated the contributions from each one separately. Th…
Asteroseismology of the mild Am δ Sct star HD 118660: TESS photometry and modelling
Goswami, Aruna; Joshi, Santosh; Semenko, Eugene +9 more
We present the results of an asteroseismic study of HD 118660 (TIC 171729860), being a chemically peculiar (mild Am) star exhibiting
Estimating the lateral speed of a fast shock driven by a coronal mass ejection at the location of solar radio emissions
Kilpua, E. K. J.; Pomoell, J.; Morosan, D. E. +1 more
Context. Fast coronal mass ejections (CMEs) can drive shock waves capable of accelerating electrons to high energies. These shock-accelerated electrons act as sources of electromagnetic radiation, often in the form of solar radio bursts. Recent findings suggest that radio imaging of solar radio bursts can provide a means to estimate the lateral ex…
Exploring Neutral Hydrogen in Radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and Prospects with the SKA
Sethuram, Ramya; Roy, Subhashis; Roy, Nirupam +6 more
Empirical studies of cold gas content are essential for comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on various physical properties of the interstellar medium. Massive Faranoff–Riley I/II type radio galaxies rich in molecular hydrogen wit…