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Observations of Continuous Quasiperiodic Auroral Pulsations on Saturn in High Time-Resolution UV Auroral Imagery
Badman, S. V.; Yao, Z. H.; Bader, A. +2 more
Saturn's aurora represents the ionospheric response to plasma processes occurring in the planet's entire magnetosphere. Short-lived ∼1-hr quasiperiodic high-energy electron injections, frequently observed in in situ particle and radio measurements, should therefore entail an associated flashing auroral signature. This study uses high time-resoluti…
Fundamental properties of Kepler and CoRoT targets - IV. Masses and radii from frequencies of minimum Δν and their implications
Yıldız, M.; Kayhan, C.; çelik Orhan, Z.
Recently, by analysing the oscillation frequencies of 90 stars, Yıldız, Çelik Orhan & Kayhan have shown that the reference frequencies (νmin0, νmin1, and νmin2) derived from glitches due to He II ionization zone have very strong diagnostic potential for the determination of thei…
Observation of narrow polar jets in the nascent wind of oxygen-rich AGB star EP Aqr
Winters, J. M.; Tuan-Anh, P.; Hoai, D. T. +6 more
Using ALMA observations of 12CO(2-1), 28SiO(5-4), and 32SO2(166,10-175,13) emissions of the circumstellar envelope of AGB star EP Aqr, we describe the morpho-kinematics governing the nascent wind. Main results are as follows: (1) Two narrow polar structures, referred to as jets, lau…
Chromospheric observations and magnetic configuration of a supergranular structure
Leenaarts, Jorrit; Robustini, Carolina; de la Cruz Rodríguez, Jaime +1 more
Context. Unipolar magnetic regions are often associated with supergranular cells. The chromosphere above these regions is regulated by the magnetic field, but the field structure is poorly known. In unipolar regions, the fibrillar arrangement does not always coincide with magnetic field lines, and polarimetric observations are needed to establish …
Discovery of s-process enhanced stars in the LAMOST survey
Casey, Andrew R.; Ho, Anna Y. Q.; Ji, Alexander P. +7 more
Here we present the discovery of 895 s-process-rich candidates from 454 180 giant stars observed by the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) using a data-driven approach. This sample constitutes the largest number of s-process enhanced stars ever discovered. Our sample includes 187 s-process-rich candidates that are e…
Turbulent Heating in Solar Wind Thermodynamics
Livadiotis, G.
This paper considers the concept of wave-particle thermodynamic equilibrium in order to improve our understanding of the role of turbulent heating in the solar wind proton plasma. The thermodynamic equilibrium in plasmas requires the energy of a plasmon—the quantum of plasma fundamental oscillation—to be balanced by the proton-magnetized plasma en…
Low-frequency GMRT observations of ultra-cool dwarfs
Chandra, Poonam; Kaplan, David L.; Murphy, Tara +2 more
Observations of radio emission in about 10 per cent of ultra-cool dwarfs (UCDs) indicate the presence of strong, persistent magnetic fields in these stars. These results are in contrast to early theoretical expectations on fully convective dynamos, and to other tracers of magnetic activity, such as H α and X-ray luminosity. Radio-frequency observa…
Cosmology with extragalactic proper motions: harmonic formalism, estimators, and forecasts
Hall, Alex
We conduct a thorough study into the feasibility of measuring large-scale correlated proper motions of galaxies with astrometric surveys. We introduce a harmonic formalism for analysing proper motions and their correlation functions on the sphere based on spin-weighted spherical harmonics, and study the statistics of the transverse velocity field …
Tracking the Footprints of the Radio Pulsar B1727-47: Proper Motion, Host Supernova Remnant, and the Glitches
Shternin, P.; Kirichenko, A.; Zyuzin, D. +4 more
The bright radio pulsar B1727-47, with a characteristic age of 80 kyr, was among the first pulsars discovered 50 yr ago. Using regular timing observations and its interferometric positions at three epochs, we measured, for the first time, the pulsar proper motion of 151 ± 19 mas yr-1. At the dispersion measure distance of ≳2.7 kpc, this…
First Detection of Submillimeter-wave [13C I] 3 P 1-3 P 0 Emission in a Gaseous Debris Disk of 49 Ceti with ALMA
Yamamoto, Satoshi; Higuchi, Aya E.; Oya, Yoko
We have detected the submillimeter-wave fine-structure transition (3 P 1-3 P 0) of 13C, [13C I], in the gaseous debris disk of 49 Ceti with the Atacama Large Millimeter/submillimeter Array (ALMA). Recently, the [C I] 3 P 1-3 P 0 emission h…