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CHEOPS's hunt for exocomets: photometric observations of 5 Vul
Lecavelier Des Etangs, Alain; Zieba, Sebastian; Rebollido, Isabel +3 more
The presence of minor bodies in exoplanetary systems is in most cases inferred through infrared excesses, with the exception of exocomets. Even if over 35 yr have passed since the first detection of exocomets around β Pic, only ~25 systems are known to show evidence of evaporating bodies, and most of them have only been observed in spectroscopy. W…
Morpho-kinematic and photoionization models of the multipolar structures in planetary nebula NGC 6572
Parthasarathy, Mudumba; Das, Ramkrishna; Kar, Subhajit +1 more
We have studied planetary nebula (PN) NGC 6572 through 3D morpho-kinematic and photoionization modelling. The 3D morphology is reconstructed from the Hubble Space Telescope images in different narrow-band filters and position-velocity spectra. The PN has a multipolar morphology consisting of highly collimated outflows. The nebular image shows sign…
Diving into the magnetosphere of the Of?p star HD 108
Neiner, Coralie; Nazé, Yaël; Rauw, Gregor +1 more
We analyse optical and X-ray spectroscopy of the Of?p star HD 108, known for its strong dipolar magnetic field and its optical line profile variability with a time-scale of 54 ± 3 yrs, interpreted as the stellar rotation period. Optical emission lines have now recovered from their minimum emission state reached in 2007-2008. The variations of the …
Influence of Intermittency on the Energy Transfer Rate of Solar Wind Turbulence
Wang, Xin; Yuan, Zhigang; Huang, Shiyong +2 more
The intermittency in the solar wind turbulence manifests itself in the anisotropic scaling due to the anisotropic spectral index and the intermittent level based on the extended P model. However, the influence of intermittency on the energy transfer rate remains unclear. Here we apply the partial variance of increments method to identify the inter…
The 3D kinematics of stellar substructures in the periphery of the Large Magellanic Cloud
Erkal, Denis; Belokurov, Vasily; Aguado, David S. +4 more
We report the 3D kinematics of 27 Mira-like stars in the northern, eastern, and southern periphery of the Large Magellanic Cloud (LMC), based on Gaia proper motions and a dedicated spectroscopic follow-up. Low-resolution spectra were obtained for more than 40 Mira-like candidates, selected to trace known substructures in the LMC periphery. Radial …
The evolution of Martian fissure eruptions and their plumbing systems
Pieterek, Bartosz; Jones, Thomas J.
On Earth, the investigation of fissure eruptions and their deposits provide fundamental insights into the evolution of the subsurface volcanic plumbing system. On Mars, we have limited evidence of the spatiotemporal evolution of fissure-fed volcanic systems, and thus the processes operating within their subsurface-feeding dykes remain poorly under…
IP Lyn: A Totally Eclipsing Contact Binary with an Extremely Low Mass Ratio
Meng, Zi-Bin; Yu, Yun-Xia; Hu, Ke +4 more
We present the first photometric and orbital period investigations for a neglected totally eclipsing contact binary IP Lyn. The photometric solutions derived from both ground-based and several surveys' observations suggest that it is a shallow contact binary with an extremely low mass ratio of 0.055. The weak asymmetry observed in our multiple ban…
High-velocity CP2 stars in the Galactic halo
Paunzen, E.; Prišegen, M.; Faltová, N. +2 more
Context. The second subclass of chemically peculiar stars, the CP2 stars, are early-type stars exhibiting anomalous abundances with variable line strengths possibly also accompanied by photometric variability that typically belong to the Galactic disk. However, a small fraction of these objects were recently found to be located far from the Galact…
Multiwavelength study of radio galaxy Pictor A: detection of western hotspot in far-UV and possible origin of high energy emissions
Stalin, C. S.; Sreekumar, P.; Bhattacharya, Debbijoy +2 more
A comprehensive study of the nucleus and western hotspot of Pictor A is carried out using AstroSat observations, 13 yr of Fermi, and archival Swift observations along with other published data. We report the first detection of the western hotspot of Pictor A in the far-UV band using observations from AstroSat-UVIT. The broad-band SED of the wester…
Searching for quasi-periodic eruptions using machine learning
Young, A. J.; Webbe, Robbie
Quasi-periodic eruption (QPE) is a rare phenomenon in which the X-ray emission from the nuclei of galaxies shows a series of large amplitude flares. Only a handful of QPEs have been observed but the possibility remains that there are as yet undetected sources in archival data. Given the volume of data available a manual search is not feasible, and…