Search Publications
Optical and Near-infrared Continuum Emission Region Size Measurements in the Lensed Quasar FBQ J0951+2635
Vrba, Frederick J.; Dahm, Scott E.; Morgan, Christopher W. +5 more
We present 10 seasons of Sloan Digital Sky Survey r-band monitoring observations and five seasons of H-band observations of the two-image system FBQ J0951+2635 from the Kaj Strand Astrometric Reflector at the United States Naval Observatory, Flagstaff Station. We supplement our light curves with six seasons of monitoring data from the literature t…
Spectral analysis of the AMXP IGR J17591-2342 during its 2018 outburst
Sanna, A.; Di Salvo, T.; Burderi, L. +9 more
The Accreting Millisecond X-ray Pulsar IGR J17591-2342 is a Low Mass X-ray Binary (LMXB) system that went in outburst on 2018 August and it was monitored by the NICER observatory and partially by other facilities. We aim to study how the spectral emission of this source evolved during the outburst by exploiting the whole X-ray data repository of s…
A modern-day Mars climate in the Met Office Unified Model: dry simulations
Drummond, Benjamin; Mayne, Nathan; McCulloch, Danny +5 more
We present results from the Met Office Unified Model (UM), a world-leading climate and weather model, adapted to simulate a dry Martian climate. We detail the adaptation of the basic parameterisations and analyse results from two simulations, one with radiatively active mineral dust and one with radiatively inactive dust. These simulations demonst…
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…