Search Publications
Differential apparent thermal inertia of sloping terrain on Mars: Implications for the magmatic intrusions at Olympus Mons
Ciazela, M.; Ciazela, J.; Pieterek, B.
Mars, which exhibits exceptionally high surface temperature gradients due to the lack of vegetation and thin atmosphere, is especially suitable for the DATI approach. Taking advantage of this Mars property, we propose a new DATI-based method for thermal inertia calculation on Mars based on albedo and short-time-intervals of temperature difference.…
White Dwarf Photospheric Abundances in Cataclysmic Variables. III. Five Dwarf Novae with an Evolved Secondary Donor Star
Sion, Edward M.; Godon, Patrick
In the last two decades infrared spectroscopy has brought mounting evidence, in the form of weak CO features together with enhanced 13C, of the presence of CNO-processed material in the atmosphere of the donor star of some nonmagnetic cataclysmic variables. Some of these donors also exhibit a temperature too high for their binary orbita…
Classifying IGR J15038-6021 as a magnetic CV with a massive white dwarf
Hare, Jeremy; Mukai, Koji; Fornasini, Francesca M. +8 more
Cataclysmic variables (CVs) are binary systems consisting of a white dwarf (WD) accreting matter from a companion star. Observations of CVs provide an opportunity to learn about accretion discs, the physics of compact objects, classical novae, and the evolution of the binary and the WD that may ultimately end in a Type Ia supernova (SN). As Type I…
New Interstellar Extinction Maps Based on Gaia and Other Sky Surveys
Savchenko, S. S.; Gontcharov, G. A.; Il'in, V. B. +5 more
We present new three-dimensional (3D) interstellar extinction maps in the $V$ and Gaia $G$ filters within 2 kpc of the Sun, a 3D differential extinction (dust spatial distribution density) map along lines of sight in the same space, a 3D map of variations in the ratio of the extinctions in the $V$ and Gaia $G$ filters within 800 pc of the Sun, and…
Predicting convective blueshift and radial-velocity dispersion due to granulation for FGK stars
Chaplin, W. J.; Meunier, N.; Dalal, S. +2 more
To detect Earth-mass planets using the Doppler method, a major obstacle is to differentiate the planetary signal from intrinsic stellar variability (e.g. pulsations, granulation, spots, and plages). Convective blueshift, which results from small-scale convection at the surface of Sun-like stars, is relevant for Earth-twin detections as it exhibits…
Polarized Light from Accreting Low Mass X-Ray Binaries
Capitanio, F.; Farinelli, R.; Fabiani, S. +5 more
Thanks to IXPE, the X-ray spectro-polarimeter launched at the end of 2021, X-ray polarimetry has finally become an extraordinary tool in investigating the physics of accretion in low mass X-ray binaries. Similarly to what happened with gravitational waves, X-ray polarimetry would play a new complementary but at the same time fundamental role in th…
The SWAP Filter: A Simple Azimuthally Varying Radial Filter for Wide-Field EUV Solar Images
Berghmans, David; Rachmeler, Laurel A.; West, Matthew J. +5 more
We present the SWAP Filter: an azimuthally varying, radial normalizing filter specifically developed for EUV images of the solar corona, named for the Sun Watcher with Active Pixels and Image Processing (SWAP) instrument on the Project for On-Board Autonomy 2 (PROBA2) spacecraft. We discuss the origins of our technique, its implementation and key …
Gaia colour-magnitude diagrams of young open clusters. Identification in the UBC catalogue and comparison between manual and automated analyses
de Burgos, A.; Negueruela, I.
Context. Automated analyses of Gaia astrometric data have led to the discovery of many new high-quality open cluster candidates. When a good determination of their parameters is available, these objects become excellent tools for investigating the properties of our Galaxy.
Aims: We explore whether young open clusters can be readily identified…
A New Tool for Understanding the Solar Wind-Venus Interaction: Three-dimensional Multifluid MHD Model
Zhang, Tielong; Yao, Zhonghua; Dang, Tong +5 more
In this paper, we present a new tool to investigate the interaction of the solar wind with Venus with the approach of a global multifluid magnetohydrodynamics (MHD) model. The continuity, momentum, and energy equations for H+, O+, ${{\rm{O}}}_{2}^{+}$ , and ${\mathrm{CO}}_{2}^{+}$ are solved self-consistently together with Fa…
Sequential Remote Brightenings and Co-spatial Fast Downflows during Two Successive Flares
Cheng, X.; Ding, M. D.; Li, C. +2 more
Remote brightenings often appear at the outskirts of the active regions of solar eruptive events. Nevertheless, their origin remains to be ascertained. In this study, we report imaging and spectroscopic observations of sequential remote brightenings with a combination of observations from the Hα Imaging Spectrograph on board the Chinese Hα Solar E…