Search Publications

A JWST MIRI MRS View of the η Tel Debris Disk and Its Brown Dwarf Companion

Law, David R.; Chen, Christine H.; Hines, Dean C. +12 more

We report JWST Mid-Infrared Instrument (MIRI) Medium Resolution Spectrograph (MRS) observations of the β Pic moving-group member, η Tel A, along with its brown dwarf binary companion, η Tel B. Following point-spread-function subtraction, we recover the spatially resolved flux from the debris disk around η Tel A, along with the position of the comp…

Investigative study of five low mass ratio semi-detached binaries

Stassun, Keivan G.; Parthasarathy, Mudumba; Jagirdar, Rukmini +2 more

We present the first pulsation analysis of four totally eclipsing Algol systems S Cnc, SS Cet, TW And, and VW Cyg using the latest data available from Kepler (K2), and TESS databases. Based on the characteristics observed they are classified to be oscillating eclipsing Algol binaries with primary components having

Spectropolarimetric Radio Imaging of Faint Gyrosynchrotron Emission from a CME: A Possible Indication of the Insufficiency of Homogeneous Models

Mondal, Surajit; Oberoi, Divya; Kansabanik, Devojyoti

The geo-effectiveness of coronal mass ejections (CMEs) is determined primarily by their magnetic fields. Modeling of gyrosynchrotron (GS) emission is a promising remote sensing technique to measure the CME magnetic field at coronal heights. However, faint GS emission from CME flux ropes is hard to detect in the presence of bright solar emission fr…

Dust-dust collisions in cometary comas: applications to comet 67P/Churyumov-Gerasimenko

Planes, María Belén; Parisi, M. Gabriela; Millán, Emmanuel N. +2 more

Silica has emerged as a crucial component within inner comet comas. This work investigates silica dust aggregates and their interactions within cometary comas. We study the probability that aggregates in the size range 1-100 µm collide with each other in the coma and analyse the outcomes of such collisions by using the 'Collision of Porous Aggrega…

WawHelioIonMP: A Semiempirical Tool for the Determination of Latitudinal Variation in the Ionization Rate of Interstellar Hydrogen and the Solar Wind

Bzowski, M.; Porowski, C.

The latitudinal structure of the solar wind varies during the cycle of solar activity. Analysis of this variation is important for understanding the solar activity and interpretation of observations of heliospheric energetic neutral hydrogen atoms and interstellar neutral (ISN) atoms inside the heliosphere, which yield information on the heliosphe…

Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs (Corrigendum)

Thévenin, Frédéric; Kervella, Pierre; Arenou, Frédéric

Amazonian Tectonic Evolution of Ceraunius and Tractus Fossae, Mars, and Implications for Local Magmatic Sources

Byrne, Paul K.; Shahrzad, Stephanie; Bramham, Emma K. +2 more

The heavily faulted Martian terrains of Ceraunius Fossae and Tractus Fossae, south of the Alba Mons volcano, have previously only been considered as parts of larger tectonic studies of Alba Mons, and consequently the complexity of the faulting remains unclear. As these terrains are in the midst of the large Tharsis volcanoes, the study of their su…

Comprehensive observations and geostatistics of slope streaks within the Olympus Mons aureole

Stillman, D. E.; Primm, K. M.; Hoover, R. H. +3 more

Slope streaks (SS) are enigmatic linear features characterized by relatively low-albedo features that appear and fade on high-albedo slopes on Mars. Despite numerous hypotheses proposed to explain their formation, the primary mechanism behind SS remains elusive. Here, we examine 702 SS features using 32 multitemporal Context Imager (CTX) images an…

The evolution of lithium in FGK dwarf stars. Influence of planets and Galactic migration

Alfaro, E. J.; Cifuentes, C.; Cruz, P. +4 more

This work aims to investigate the behaviour of the lithium abundance in stars with and without detected planets. Our study is based on a sample of 1332 FGK main-sequence stars with measured lithium abundances, for 257 of which planets were detected. Our method reviews the sample statistics and is addressed specifically to the influence of tides an…

Further Study of the Relationship between Transient Effects in Energetic Proton and Cosmic Ray Fluxes Induced by Coronal Mass Ejections

Maričić, Darije; Savić, Mihailo; Veselinović, Nikola +4 more

The study and better understanding of energetic transient phenomena caused by disturbances occurring on our Sun are of great importance, primarily due to the potential negative effects those events can have on Earth's environment. Here, we present the continuation of our previous work on understanding the connection between disturbances in the flu…