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Projected spin-orbit alignments from Kepler asteroseismology and Gaia astrometry
Triaud, Amaury H. M. J.; Chaplin, William J.; Nielsen, Martin B. +2 more
The angle between the rotation and orbital axes of stars in binary systems - the obliquity - is an important indicator of how these systems form and evolve, but few such measurements exist. We combine the sample of astrometric orbital inclinations from Gaia Data Release 3 with a sample of solar-like oscillators in which rotational inclinations hav…
XMM2ATHENA, the H2020 project to improve XMM‑Newton analysis software and prepare for Athena
Ballet, Jean; Pouliasis, Ektoras; Maggi, Pierre +31 more
XMM‑Newton, a European Space Agency observatory, has been observing the X‑ray, ultra‑violet, and optical sky for 23 years. During this time, astronomy has evolved from mainly studying single sources to populations and from a single wavelength, to multi‑wavelength/messenger data. We are also moving into an era of time domain astronomy. New software…
Comparison Between Radio Loud and Radio Quiet Fast CMEs: A Reason for Radio Quietness
Shanmugaraju, A.; Ebenezer, E.; Syed Ibrahim, M.
It is well known that fast CMEs are mostly associated with magnetohydrodynamic (MHD) shocks in the solar corona, forming type-II radio bursts. However, the absence of type-II radio bursts is not uncommon. Herein, we aim to analyze the differences between the radio loud (RL) and radio quiet (RQ) fast Coronal Mass Ejections (CMEs) (speed ≥ 900 km s<…
Precise near-infrared photometry, accounting for precipitable water vapour at SPECULOOS Southern Observatory
Queloz, D.; Delrez, L.; Gillon, M. +20 more
The variability induced by precipitable water vapour (PWV) can heavily affect the accuracy of time-series photometric measurements gathered from the ground, especially in the near-infrared. We present here a novel method of modelling and mitigating this variability, as well as open-sourcing the developed tool - Umbrella. In this study, we evaluate…
Carbon Abundance of Globular Cluster M22 (NGC 6656) and the Surface Carbon Depletion Rates of the Milky Way Globular Clusters
Lee, Jae-Woo
It is well known that metal-poor red giant branch (RGB) stars show variations in some elemental abundances, including carbon, due to the internal mixing accompanied by their own in situ CN cycle in the hydrogen burning shell. With our new photometric carbon abundance measurements of RGB stars in M22 and other globular clusters (GCs) in our previou…
The Lockman-SpReSO project. Description, target selection, observations, and catalogue preparation
Krongold, Yair; Gallego, Jesús; Sánchez-Portal, Miguel +26 more
Context. Extragalactic surveys are a key tool for better understanding the evolution of galaxies. Both deep and wide-field surveys serve to provide a clearer emerging picture of the physical processes that take place in and around galaxies, and to identify which of these processes are the most important in shaping the properties of galaxies.
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High-resolution Observations of Plume Footpoints in a Solar Coronal Hole
Cao, Wenda; Yurchyshyn, Vasyl; Madjarska, Maria S. +7 more
Plumes are bright structures in coronal holes extending from the solar surface into the corona and are considered as a possible source of the solar wind. Plumes are thought to be rooted in strong unipolar photospheric flux patches (network/plage region). The magnetic activities at the base of plumes may play a crucial role in producing outflows an…
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…