Search Publications
VLA Observations of the AE Aqr-type Cataclysmic Variable LAMOST J024048.51+195226.9
Barrett, Paul E.
AE Aqr was until recently the only known magnetic cataclysmic variable (MCV) containing a rapidly spinning (33.08 s) white dwarf (WD). Its radio emission is believed to be a superposition of synchrotron-emitting plasmoids, because it has a positive spectral index spanning three orders of magnitude (≈2-2000 GHz) and is unpolarized. Both characteris…
On the synergy between Ariel and ground-based high-resolution spectroscopy
Sozzetti, Alessandro; Bonomo, Aldo S.; Guilluy, Gloria +2 more
Since the first discovery of an extra-solar planet around a main-sequence star, in 1995, the number of detected exoplanets has increased enormously. Over the past two decades, observational instruments (both onboard and on ground-based facilities) have revealed an astonishing diversity in planetary physical features (i. e. mass and radius), and or…
Water ortho-to-para ratio in the coma of comet 67P/Churyumov-Gerasimenko
Encrenaz, T.; Erard, S.; Crovisier, J. +9 more
Context. Abundance ratios of the nuclear-spin isomers of H2O and NH3 have been measured in about two dozen comets, with a mean value corresponding to a nuclear-spin temperature of ~30 K. The real meaning of these unequilibrated nuclear-spin abundance ratios is still debated. However, an equilibrated water ortho-to-para ratio …
The Distribution of UV Radiation Field in the Molecular Clouds of Gould Belt
Li, Di; Xie, Jinjin; Fuller, Gary A. +5 more
The distribution of ultraviolet (UV) radiation field provides critical constraints on the physical environments of molecular clouds. Within 1 kpc of our solar system and fostering protostars of different masses, the giant molecular clouds in the Gould Belt present an excellent opportunity to resolve the UV field structure in star-forming regions. …
The galaxy population of the core of the Coma cluster
Hasan, S. N.; Poloji, Nagamani; Hasan, Priya
In this paper, we present the structural properties and morphology of galaxies in the central region of the Coma Cluster brighter than 19.5 mag in the F814W band from the HST/ACS Coma Cluster Treasury Survey. Using mainly spectroscopic redshifts, we find 132 members from our sample of 219 galaxies. In our sample of 132 members, we find 51 non-dwar…
Evolution of pits at the surface of 67P/Churyumov-Gerasimenko
Guilbert-Lepoutre, Aurélie; Besse, Sébastien; Benseguane, Selma +6 more
Context. The observation of pits at the surface of comets offers the opportunity to take a glimpse into the properties and the mechanisms that shape a nucleus through cometary activity. If the origin of these pits is still a matter of debate, multiple studies have recently suggested that known phase transitions (such as volatile sublimation or amo…
Seismic modelling of the pulsating mercury-manganese star HD 29589
Niemczura, E.; Hubrig, S.; Hummel, C. A. +4 more
Photometric and spectroscopic time-series of chemically peculiar mercury-manganese (HgMn) stars show variability, which in most cases is interpreted as the effect of binarity or surface spots. Until recently, pulsations have not been detected in these objects. However, the analysis of the Transiting Exoplanet Survey Satellite (TESS) photometric ti…
A Statistical Comparison of EUV Brightenings Observed by SO/EUI with Simulated Brightenings in Nonpotential Simulations
Harra, Louise K.; Barczynski, Krzysztof; Berghmans, David +3 more
The High Resolution Imager (HRIEUV) telescope of the Extreme Ultraviolet Imager (EUI) instrument onboard Solar Orbiter has observed EUV brightenings, so-called campfires, as fine-scale structures at coronal temperatures. The goal of this paper is to compare the basic geometrical (size, orientation) and physical (intensity, lifetime) pro…
A deeper solution to the actual geometry of CCD mosaic chips
Vienne, A.; Lin, F. R.; Peng, Q. Y. +2 more
Context. For charge-coupled device (CCD) mosaic chips in the focal plane of a large telescope, the unification for all the measurements of each chip is vital to some scientific projects, such as deep astrometric standards or construction for deeper images that can also seamlessly cover a larger area of the sky. A key part of the reduction involves…
Cloud motion and magnetic fields: Four clouds in the Cepheus Flare region
Maheswar, G.; Dib, S.; Sharma, E.
Context. The Cepheus Flare region consists of a group of dark cloud complexes that are currently active in star formation.
Aims: The aim of this work is to estimate the motions of four clouds, namely L1147/1158, L1172/1174, L1228, and L1251, located at relatively high Galactic latitude (b > 14°) in the Cepheus Flare region. We study the re…