Search Publications
The Role of Terahertz and Far-IR Spectroscopy in Understanding the Formation and Evolution of Interstellar Prebiotic Molecules
Mifsud, Duncan V.; Hailey, Perry A.; Traspas Muiña, Alejandra +3 more
Stellar systems are often formed through the collapse of dense molecular clouds which, in turn, return copious amounts of atomic and molecular material to the interstellar medium. An in-depth understanding of chemical evolution during this cyclic interaction between the stars and the interstellar medium is at the heart of astrochemistry. Systemati…
The Rise and Fall of the Eclipsing Binary HS Hydrae
Davenport, James. R. A.; Windemuth, Diana; Warmbein, Karen +3 more
HS Hydrae is a short period eclipsing binary (Porb = 1.57 day) that belongs to a rare group of systems observed to have rapidly changing inclinations. This evolution is due to a third star on an intermediate orbit, and results in significant differences in eclipse depths and timings year to year. Zasche & Paschke revealed that HS Hy…
Local Analogs to High-redshift Galaxies. I. Characterization of Dust Emission and Star Formation History
Wiklind, Tommy; Eufrasio, Rafael T.; Motiño Flores, Skarleth M.
Star-forming dwarf galaxies have properties similar to those expected in high-redshift galaxies. Hence, these local galaxies may provide insights into the evolution of the first galaxies and the physical processes at work. We present a sample of 11 potential local analogs to high-z (LAHz) galaxies. The sample consists of blue compact dwarf galaxie…
Multiwavelength Quasi-periodic Pulsations in a Stellar Superflare
Nakariakov, Valery M.; Kolotkov, Dmitrii Y.; Holt, Robin +1 more
We present the first multiwavelength simultaneous detection of quasi-periodic pulsations (QPPs) in a superflare (more than a thousand times stronger than known solar flares) on a cool star, in soft X-rays (SXRs, with XMM-Newton) and white light (WL, with Kepler). It allowed for the first ever analysis of oscillatory processes in a stellar flare si…
Global Venus Solar Wind Coupling and Oxygen Ion Escape
Fedorov, A.; Barabash, S.; Futaana, Y. +5 more
The present day Venusian atmosphere is dry, yet, in its earlier history a significant amount of water evidently existed. One important water loss process comes from the energy and momentum transfer from the solar wind to the atmospheric particles. Here, we used measurements from the Ion Mass Analyzer onboard Venus Express to derive a relation betw…
Landforms indicative of regional warm based glaciation, Phlegra Montes, Mars
Butcher, Frances E. G.; Gallagher, Colman; Balme, Matt +2 more
Viscous flow features (VFF) occur in the mid-latitudes of Mars and have characteristics consistent with being glaciers. Climate models suggest that martian glaciers are cold-based systems in which meltwater has never been widely produced. VFF are common in Phlegra Montes, a mountain range in the mid-latitudes of the northern hemisphere of Mars. Ho…
X-ray shapes of elliptical galaxies and implications for self-interacting dark matter
Jeltema, T.; McDaniel, A.; Profumo, S.
Several proposed models for dark matter posit the existence of self-interaction processes that can impact the shape of dark matter halos, making them more spherical than the ellipsoidal halos of collisionless dark matter. One method of probing the halo shapes, and thus the strength of the dark matter self-interaction, is by measuring the shape of …
Using radial velocities to reveal black holes in binaries: A test case
Babusiaux, C.; Dubus, G.; Casares, J. +1 more
Aims: Large radial velocity variations in the LAMOST spectra of giant stars have been used to infer the presence of unseen companions. Some of them have been proposed as possible black hole candidates. We test this selection by investigating the classification of the one candidate that has a known X-ray counterpart (UCAC4 721-037069).
Me…
20 Years of Cluster Observations: The Magnetopause
Hasegawa, H.; Dunlop, M.; Haaland, S. +2 more
The terrestrial magnetopause forms the boundary between the solar wind plasma with its embedded interplanetary magnetic field on one side, and the terrestrial magnetosphere, dominated by Earth's dipole field, on the other side. It is therefore a key region for the transfer of mass, momentum, and energy from the solar wind to the magnetosphere. The…
New members of Cygnus OB2 from Gaia DR2
Orellana, R. B.; De Biasi, M. S.; Paíz, L. G.
Due to the high quality of Gaia DR2 stellar parallaxes and proper motions, we can study the Cygnus OB2 region up to G = 17.5 mag in circular region centred at (l, b) = (79.8°, +0.8°) of radius 1°. We detect four overdensities in the Vector Point Diagram. We apply a parametric model of the proper motion distribution and determine their mean proper …