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Jupiter's third largest and longest-lived oval: Color changes and dynamics
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +7 more
The transition region between the North Equatorial Band (NEBn) and North Tropical Zone (NTrZ) in Jupiter is home to convective storms, systems of cyclones and anticyclones and atmospheric waves. Zonal winds are weak but have a strong latitudinal shear allowing the formation of cyclones (typically dark) and anticyclones (typically white) that remai…
The 3D Structure of Saturn Magnetospheric Neutral Tori Produced by the Enceladus Plumes
Richardson, John D.; Smith, Howard Todd
This research provides updated and validated spatial distributions of Enceladus generated H2O, OH, and O neutral tori. These tori are produced by the primary neutral source, Enceladus, and consist of populations of coorbiting neutral particles that provide the bulk of heavy molecules to Saturn's (neutral particle dominant) magnetosphere…
Star Formation Rate Function at z 4.5: An Analysis from Rest UV to Optical
Asada, Yoshihisa; Ohta, Kouji; Maeda, Fumiya
We present a star formation rate function (SFRF) at z ~ 4.5 based on photometric data from the rest UV to optical of galaxies in the CANDELS GOODS-South field using spectral energy distribution (SED) fitting. We evaluate the incompleteness of our sample and correct for it to properly compare the SFRF in this study with those estimated based on oth…
Control of magnetopause flux rope topology by non-local reconnection
Eastwood, Jonathan P.; Mejnertsen, Lars; Chittenden, Jeremy P.
Dayside magnetic reconnection between the interplanetary magnetic field and the Earth's magnetic field is the primary mechanism enabling mass and energy entry into the magnetosphere. During favorable solar wind conditions, multiple reconnection X-lines can form on the dayside magnetopause, potentially forming flux ropes. These flux ropes move tail…
Understanding the Velocity Distribution of the Galactic Bulge with APOGEE and Gaia
Mao, Shude; Liu, Chao; Fernández-Trincado, José G. +5 more
We revisit the stellar velocity distribution in the Galactic bulge/bar region with Apache Point Observatory Galactic Evolution Experiment DR16 and Gaia DR2, focusing in particular on the possible high-velocity (HV) peaks and their physical origin. We fit the velocity distributions with two different models, namely with Gauss-Hermite polynomials an…
A young spectroscopic binary in a quintuple system part of the Local Association
Murgas, Felipe; Jeffers, Sandra V.; McCully, Curtis +9 more
Context. Double-lined spectroscopic (SB2) binaries allow us to obtain a direct determination of the masses of their components, which is essential to test stellar models. Although these objects only provide a lower limit for the mass, they are more abundant than their eclipsing counterparts as they are not as strongly limited by the inclination of…
A Stringent Test of Magnetic Models of Stellar Evolution
Torres, Guillermo; Vanderburg, Andrew; Curtis, Jason L. +1 more
Main-sequence stars with convective envelopes often appear larger and cooler than predicted by standard models of stellar evolution for their measured masses. This is believed to be caused by stellar activity. In a recent study, accurate measurements were published for the K-type components of the 1.62-day detached eclipsing binary EPIC 219511354,…
The nearby spiral density-wave structure of the Galaxy: line-of-sight velocities of the Gaia DR2 OB stars
Gedalin, Michael; Jiang, Ing-Guey; Griv, Evgeny
Distances and line-of-sight velocities of 964 Gaia Data Release 2 (DR2) OB stars of Xu et al. within 3 kpc from the Sun and 500 pc from the Galactic mid-plane with accuracies of <50 per cent are selected. The data are used to find small systematic departures of velocities from the mean circular motion for the stars in the solar neighborhood due…
The time delay of CLASS B1600+434 from VLA multi-frequency and polarization monitoring
Biggs, A. D.
We present an analysis of archival multi-frequency Very Large Array monitoring data of the two-image gravitational lens system CLASS B1600+434, including the polarization properties at 8.5 GHz. From simulating radio light curves incorporating realistic external variability in image A, we find time delays consistent at 1σ for all frequencies and in…
A Grid of Synthetic Spectra for Subdwarfs: Non-LTE Line-blanketed Atmosphere Models
Diaz, Marcos P.; Levenhagen, Ronaldo S.; Coelho, Paula R. T. +1 more
A new grid of detailed atmosphere model spectra for hot and moderately cool subdwarf stars is presented. High-resolution spectra and synthetic photometry are calculated in the range from 1000-10,000 Å using non-LTE fully line-blanketed atmosphere structures. Our grid covers eight temperatures within 10,000 ≤ Teff [K] ≤ 65,000, three sur…