Search Publications
On the potential variation of charged dust in Saturn's magnetosphere: The dust-plasma interaction
Rehman, Umer; Hussain, Ibrar; Qammar, Ambreen
We presented a theory describing interaction between cold plasma and dust grain based on Cassini observations of Enceladus in Saturn's E ring. We assumed a finite-sized dust cloud with inside plasma to simulate the environment. The dust cloud that results from this scenario has a different potential than the surrounding plasma. Cassini's observati…
An astrometric mass estimate for asteroid (223) Rosa
Kretlow, M.
Context. Outer main belt asteroid (223) Rosa is a possible flyby target of opportunity for the European Space Agency (ESA) JUpiter ICy moons Explorer (JUICE) mission when it passes the asteroid belt on the way to Jupiter. The very low albedo and the featureless red spectra indicate a P-type asteroid in the Tholen taxonomy, though the yet known bul…
HST STIS Observations of ζ Aurigae A's Irradiated Atmosphere
Ayres, Thomas R.; Harper, Graham M.; Bennett, Philip D. +3 more
The details of the processes responsible for heating the chromospheres of evolved cool stars remain uncertain. While most spectroscopic diagnostics measure spatially-integrated emission, here we examine diagnostics sensitive to localized atmospheric regions that are specific to cool evolved stars in binary systems with hot main-sequence companions…
Machine learning for effective spacecraft operation: Operating INTEGRAL through dynamic radiation environments
Finn, Timothy; Southworth, Richard; Donati, Alessandro +8 more
INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory) is an astronomical observatory of the European Space Agency, responsible for many significant scientific discoveries in the last few decades. It orbits Earth since 2002 in a highly elliptical orbit, passing through the Van Allen belts - areas with high-energy ionized particles that can dam…
Imaging and Spectroscopic Observations of the Dynamic Processes in Limb Solar Flares
Ding, M. D.; Li, Y.; Song, De-Chao +2 more
We investigate various dynamic processes including magnetic reconnection, chromospheric evaporation, and coronal rain draining in two limb solar flares through imaging and spectroscopic observations from the Interface Region Imaging Spectrograph (IRIS) and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. In the early…
Global Extinction: Gemini North and South GMOS Combined Photometry Relative to the Gaia Catalog, and Long-term Atmospheric Change
Steinbring, Eric
Effects of long-term atmospheric change were looked for in photometry employing Gemini North and South twin Multi-Object Spectrograph (GMOS-N and GMOS-S) archival data. The whole GMOS imaging database, beginning from 2003, was compared against the all-sky Gaia object catalog, yielding ~106 Sloan $r^{\prime} $ -filter samples, ending in …
Parameters of the eclipsing binary α Draconis observed by TESS and SONG
Kochukhov, Oleg; Bedding, Timothy R.; Murphy, Simon J. +9 more
We present an analysis of the eclipsing single-lined spectroscopic binary system α Dra based on photometry from the Transiting Exoplanet Survey Satellite (TESS) mission and newly acquired spectroscopic measurements. Recently discovered to have eclipses in the TESS data, at a magnitude of V = 3.7, α Dra is now one of the brightest detached eclipsin…
An optimized survey strategy for the ERIS/NIX imager: searching for young giant exoplanets and very low mass brown dwarfs using the K-peak custom photometric filter
Allers, Katelyn; Kenworthy, Matthew A.; Bonavita, Mariangela +5 more
We present optimal survey strategies for the upcoming NIX imager, part of the Enhanced Resolution Imager and Spectrograph instrument to be installed on the Very Large Telescope. We will use a custom 2.2 µm K-peak filter to optimize the efficiency of a future large-scale direct imaging survey, aiming to detect brown dwarfs and giant planets around …
Discovery of a Brown Dwarf with Quasi-spherical Mass Loss
Dunham, Michael M.; Jofré, Paula; Cieza, Lucas A. +14 more
We report the serendipitous discovery of an elliptical shell of CO associated with the faint stellar object SSTc2d J163134.1-240060 as part of the "Ophiuchus Disk Survey Employing ALMA" (ODISEA), a project aiming to study the entire population of protoplanetary disks in the Ophiuchus Molecular Cloud from 230 GHz continuum emission and 12
A Semi-empirical Approach to the Dynamic Coupling of CMEs and Solar Wind
Riley, P.; Corona-Romero, P.; González-Avilés, J. J.
Coronal mass ejections (CMEs) are one of the most relevant phenomena for space weather. Moreover, CMEs can negatively affect essential services and facilities. Therefore, to protect society, we require well-grounded knowledge of the physics that governs the propagation of CMEs from near the Sun to the orbit of Earth. In this work, we deduce expres…