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Kelvin-Helmholtz Vortices as an Interplay of Magnetosphere-Ionosphere Coupling
Russell, C. T.; Escoubet, C. P.; Torbert, R. B. +11 more
The solar wind-magnetosphere interaction drives diverse physical processes on the flanks of Earth's magnetopause, and in turn these processes couple to the ionosphere. We investigate simultaneous multipoint in-situ spacecraft and ground-based measurements to determine the role of Kelvin-Helmholtz waves at the Earth's magnetopause and the low-latit…
A Jupiter Analog Orbiting The Nearby M Dwarf GJ 463
Cochran, William D.; Endl, Michael; Howard, Andrew W. +8 more
We report the detection of a long-period giant planetary companion to the nearby M3V star GJ 463 (=Ross 690). The detection is based on over ten years of highly-precise radial velocity measurements with the High Resolution Spectrograph at the Hobby-Eberly Telescope and the HIRES spectrograph at Keck. With an orbital period of 10 yr and a minimum m…
Determining Star Formation Rates of Active Galactic Nucleus Host Galaxies Based on SED Fitting with Submillimeter Data
Jadhav, Yashashree; Hwang, Ho Seong; Luo, Rongxin +9 more
We present the star formation rate (SFR) measurements based on the spectral energy distribution (SED) analysis with new submillimeter fluxes combined with archival multiwavelength data for a sample of 52 active galactic nucleus (AGN) host galaxies at z < 0.2. We carried out submillimeter observations using the SCUBA-2 camera at the James Clerk …
A Single-lined Spectroscopic Binary Companion to an Active and Deep Contact Binary in a Quintuple Stellar System
Li, P.; Qian, S. -B.; Liao, W. -P. +5 more
V410 Aur is a known deep and low-mass-ratio contact binary with a spectroscopically tertiary component and a visual companion. However, the physical and orbital properties of the tertiary are unknown. We constructed (O - C) curve with 117 new eclipse times and those collected from the literature, which shows a cyclical variation with a period of 2…
Alternating North-South Brightness Ratio of Ganymede's Auroral Ovals: Hubble Space Telescope Observations Around the Juno PJ34 Flyby
Saur, Joachim; Roth, Lorenz; Strobel, Darrell F. +17 more
We report results of Hubble Space Telescope observations from Ganymede's orbitally trailing side which were taken around the flyby of the Juno spacecraft on 7 June 2021. We find that Ganymede's northern and southern auroral ovals alternate in brightness such that the oval facing Jupiter's magnetospheric plasma sheet is brighter than the other one.…
Non-parametric spherical Jeans mass estimation with B-splines
Vasiliev, Eugene; Valluri, Monica; Rehemtulla, Nabeel
Spherical Jeans modelling is widely used to estimate mass profiles of systems from star clusters to galactic stellar haloes to clusters of galaxies. It derives the cumulative mass profile, M(<r), from kinematics of tracers of the potential under the assumptions of spherical symmetry and dynamical equilibrium. We consider the application of Jean…
Warped Disk Galaxies. I. Linking U-type Warps in Groups/Clusters to Jellyfish Galaxies
Yoon, Suk-Jin; Paudel, Sanjaya; Zee, Woong-Bae G. +3 more
Warped disk galaxies are classified into two morphologies: S and U types. Conventional theories routinely attribute both types to galactic tidal interaction and/or gas accretion, but reproducing U types in simulations is extremely challenging. Here we investigate whether both types are governed by the same mechanisms using the most extensive sampl…
Ground-based HCN submillimetre measurements in Titan's atmosphere: an intercomparison with Herschel observations
Shulyak, D.; Hartogh, P.; Moreno, R. +4 more
Aims: The aim of this study is to measure the vertical distribution of HCN on Titan's stratosphere using ground-based submillimetre observations acquired quasi-simultaneously with the Herschel ones. This allows us to perform a consistency check between space and ground-based observations and to build a reference mean HCN vertical profile in T…
The velocity distribution of white dwarfs in Gaia EDR3
McMillan, Paul J.; Hobbs, David; Wimarsson, John +1 more
Using a penalized maximum likelihood, we estimate, for the first time, the velocity distribution of white dwarfs in the solar neighbourhood. Our sample consists of 129 675 white dwarfs within 500 pc in Gaia Early Data Release 3. The white dwarf velocity distributions reveal a similar structure to the rest of the solar neighbourhood stars, reflecti…
The Galactic high mass X-ray binary population with Fermi-LAT
Chadwick, Paula M.; Harvey, Max; Rulten, Cameron B.
We search for γ-ray emission from 114 Galactic high-mass X-ray binaries, including four well studied catalogued sources, in 12.5 yr of Fermi-LAT data in conjunction with the 10-yr point source catalogue. Where a γ-ray excess appears to be spatially coincident with an X-ray binary, further investigation is performed to ascertain whether this excess…