Search Publications
An Insight into the Coupling of CME Kinematics in Inner and Outer Corona and the Imprint of Source Regions
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Despite studying coronal mass ejections (CMEs) for several years, we do not yet have a complete understanding of their kinematics. To this end, it is essential to understand the change in kinematics of the CMEs as they travel from the inner corona (<3 R⊙) up to the higher heights of the outer corona. We conduct a follow-up statistica…
Eclipsing Binaries Found by the EREBOS Project: Gaia DR2 6097540197980557440-a Deeply Eclipsing sdB+dM System
Barlow, Brad N.; Corcoran, Kyle A.; Schaffenroth, Veronika +3 more
We present time-series spectroscopy and photometry of Gaia DR2 6097540197980557440, a new deeply eclipsing hot subdwarf B (sdB) + M dwarf (dM) binary. We discovered this object during the course of the Eclipsing Reflection Effect Binaries from Optical Surveys (EREBOS) project, which aims to find new eclipsing sdB+dM binaries (HW Vir systems) and i…
The Scientific Value of a Sustained Exploration Program at the Aristarchus Plateau
Glotch, Timothy D.; Li, Shuai; Lucey, Paul G. +13 more
The Aristarchus plateau hosts a diversity of volcanic features, including the largest pyroclastic deposit on the Moon, the largest sinuous rille on the Moon, and intrusive and extrusive examples of evolved, Th-rich silicic lithologies. We provide an overview of previous remote-sensing measurements of the Aristarchus plateau and provide new analyse…
Diagnostics of homologous solar-surge plasma as observed by IRIS and SDO
Kayshap, Pradeep; Tripathi, Sharad C.; Singh Payal, Rajdeep +1 more
Surges have regularly been observed in mostly H α 6563 Å and Ca II 8542 Å. However, surge responses to other prominent lines of the interface region (Mg II k 2796.35 Å and h 2803.52 Å, O IV 1401.15 Å, Si IV 1402.77 Å) are not well studied. Here, the evolution and kinematics of six homologous surges are analysed using IRIS and AIA observations. The…
The Quest for the Missing Dust. I. Restoring Large-scale Emission in Herschel Maps of Local Group Galaxies
Gordon, Karl D.; Bot, Caroline; Clark, Christopher J. R. +2 more
Because the galaxies of the Local Group have such large angular sizes, much of their diffuse, large-angular-scale emission is filtered out by the Herschel data reduction process. In this work, we restore this previously missed dust in Herschel observations of the Large Magellanic Cloud, Small Magellanic Cloud, M31, and M33. We do this by combining…
Penumbral decay observed in active region NOAA 12585
Guglielmino, S. L.; Romano, P.; Rouppe van der Voort, L. H. M. +3 more
Context. The physical conditions leading the sunspot penumbra decay are poorly understood so far.
Aims: We investigate the photospheric magnetic and velocity properties of a sunspot penumbra during the decay phase to advance the current knowledge of the conditions leading to this process.
Methods: A penumbral decay was observed with the …
Electric thruster mode-pruning strategies for trajectory-propulsion co-optimization
Arya, Vishala; Taheri, Ehsan; Junkins, John
Application of idealized constant-specific-impulse, constant-thrust electric thruster performance models or curve-fitted polynomials is quite common for spacecraft trajectory design. However, incorporation of realistic performance models of multi-mode electric thrusters leads to notable challenges, and at the same time, offers unprecedented system…
Search for giant planets around seven white dwarfs in the Hyades cluster with the Hubble Space Telescope
Brandner, Wolfgang; Kopytova, Taisiya; Zinnecker, Hans
Only a small number of exoplanets have been identified in stellar cluster environments. We initiated a high angular resolution direct imaging search using the Hubble Space Telescope (HST) and its Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) instrument for self-luminous giant planets in orbit around seven white dwarfs in the 625 Myr …
BAT99 126: A multiple Wolf-Rayet system in the Large Magellanic Cloud with a massive near-contact binary
Shenar, T.; Sana, H.; Mahy, L. +3 more
Context. BAT99 126 is a multiple system in the Large Magellanic Cloud containing a Wolf-Rayet (WR) star, which has a reported spectroscopic (orbital) period of 25.5 days and a photometric (orbital) period of 1.55 days, and hence is potentially one of the shortest WR binaries known to date. Such short-period binary systems that contain a WR star in…
A Long Term Study of Mars Mesospheric Clouds Seen at Twilight Based on Mars Express VMC Images
Hueso, R.; Sánchez-Lavega, A.; Titov, D. +5 more
We present the first systematic study of clouds observed during twilight on Mars. We analyze images obtained by the Visual Monitoring Camera on Mars Express between 2007 and 2020. Using an automated retrieval algorithm, we found 407 cases of clouds observed at twilight, in which the geometry of the observations allows to derive the minimum altitud…