Search Publications
Missions
Journals
Publication Years
33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble
Stone, Jordan M.; von Braun, Kaspar; Schmitt, Henrique R. +2 more
We present new angular diameter measurements for 33 stars from the Navy Precision Optical Interferometer, reaching uncertainties on the limb-darkened diameter of 2% or less for 21 targets. We also determined the physical radius, bolometric flux, luminosity, and effective temperature for each star. Our sample is a mix of giant, subgiant, and dwarf …
Survey of H α
Jose, Jessy; Panwar, Neelam; Rishi, C.
Actively accreting young stellar objects show H
Masked-assisted radial-segmented target pulsed-laser deposition: A novel method for area-selective deposition using pulsed-laser deposition
Thyen, Laurenz; Splith, Daniel; Kneiß, Max +2 more
We introduce a novel technique, masked-assisted radial-segmented target pulsed-laser deposition (MARS-PLD) for unprecedented capabilities in area-selective physical vapor deposition. The MARS-PLD setup consists of a conventional PLD chamber with mechanical feedthrough for a laterally movable mask or mask set. By this means and, in principle, the a…
The Evolution of Multipole Moments for the Global Solar Magnetic Field
Wang, Weihua; Chu, Zhe; Gu, Haihua
Based on synoptic magnetic maps, we use spherical harmonic functions to decompose the global magnetic field of the Sun. Through the expansion coefficients, the power spectrum Cl, and its zonal component ClZ and sectorial component ClS for order l are defined. Through two sampled synoptic maps,…
Analysis of Front Side Halo CMEs and Their Solar Source Active Region and Flare Ribbon Properties
Moon, Y. -J.; Shanmugaraju, A.; Ebenezer, E. +3 more
Halo coronal mass ejections (CMEs) from the Sun are the subset of CMEs, which are more energetic than the normal CMEs. Only the more energetic CMEs are observable in white-light coronagraphs when they are traveling along the line of sight (LOS) and a CME is better observed when it is traveling perpendicularly to the LOS. We investigated the flare …
UV Spectral Characterization of Low-mass Stars with AstroSat UVIT for Exoplanet Applications: The Case Study of HIP 23309
Ranjan, Sukrit; Narang, Mayank; Pineda, J. Sebastian +1 more
Characterizing rocky exoplanet atmospheres is a key goal of exoplanet science, but interpreting such observations will require understanding the stellar ultraviolet (UV) irradiation incident on the planet from its host star. Stellar UV mediates atmospheric escape, photochemistry, and planetary habitability, and observations of rocky exoplanets can…
Observation of Turbulent Magnetohydrodynamic Cascade in the Jovian Magnetosheath
McComas, D. J.; Szalay, J. R.; Ebert, R. W. +6 more
We present the first estimation of the energy cascade rate in Jupiter's magnetosheath (MS). We use in situ observations from the Jovian Auroral Distributions Experiment and the magnetometer investigation instruments on board the Juno spacecraft, in concert with two recent compressible models, to investigate the cascade rate in the magnetohydrodyna…
Parametric study of the kinematic evolution of coronal mass ejection shock waves and their relation to flaring activity
Kouloumvakos, Athanasios; Rouillard, Alexis P.; Warmuth, Alexander +2 more
Context. Coronal and interplanetary shock waves produced by coronal mass ejections (CMEs) are major drivers of space-weather phenomena, inducing major changes in the heliospheric radiation environment and directly perturbing the near-Earth environment, including its magnetosphere. A better understanding of how these shock waves evolve from the cor…
Chandra Observation of NGC 1559: Eight Ultraluminous X-Ray Sources Including a Compact Binary Candidate
Kong, Albert K. H.; Chu, You-Hua; Li, Kwan-Lok +1 more
Despite the 30 yr history of ultraluminous X-ray sources (ULXs) studies, issues such as the majority of their physical natures (i.e., neutron stars, stellar-mass black holes, or intermediate black holes) as well as the accretion mechanisms are still under debate. Expanding the ULX sample size in the literature is clearly a way to help. To this end…
Variations in the intermediate wind region of the blue supergiant 55 Cygni
Kraus, M.; Granada, A.; Arias, M. L. +6 more
Context. The quantitative near-infrared (NIR) spectroscopic synthesis is an important technique for determining wind properties of massive stars. The Brα line is an excellent mass-loss tracer and provides valuable information on the physical conditions of intermediate-wind regions. The knowledge of the wind properties gained by studying the NIR li…