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Plausible association of distant late M dwarfs with low-frequency radio emission
Callingham, J. R.; Shimwell, T. W.; Hardcastle, M. J. +10 more
We present the serendipitous discovery of eight distant (> 50 pc) late M dwarfs with plausible associated radio emission at 144 MHz. The M-dwarf nature of our sources has been confirmed with optical spectroscopy performed using HET/LRS2 and Subaru/FOCAS, and their radio flux densities are within the range of 0.5−1.0 mJy at 144 MHz. Considering …
The orbital solution and dynamical masses of the binary system V* PX Virginis
Wang, Xiaoli; Fu, Yanning; Xia, Fang
V* PX Vir is a nearby single-lined spectroscopic binary with the primary being a variable of a BY Dra-type star. It has a period of ~216 d and the components of the system are two low-mass pre-main-sequence stars. By a simultaneous least-squares fit to the radial velocities, the relative positions, and the revised Hipparcos intermediate astrometri…
Characteristics of Magnetic Reconnection With a Finite X-Line Length
Lu, Quanming; Wang, Rongsheng; Lu, San +2 more
The characteristics of magnetic reconnection with a finite x-line length are studied using three-dimensional (3D) particle-in-cell (PIC) simulations. We simulate two cases: anti-parallel reconnection and guide field reconnection. In both cases, reconnection is triggered by an initial perturbation that is localized in the current direction, and the…
Kilometer-precise (UII) Umbriel physical properties from the multichord stellar occultation on 2020 September 21
Smith, N.; Sicardy, B.; Gomes-Júnior, A. R. +39 more
We report the results of the stellar occultation by (UII) Umbriel on 2020 September 21. The shadow crossed the USA and Canada, and 19 positive chords were obtained. A limb parameter accounted for putative topographic features in the limb fittings. Ellipse fittings were not robust - only upper limits were derived for the true size/shape of a putati…
A Deep Study of the Open Cluster NGC 5288 Using Photometric and Astrometric Data from GAIA DR3 and 2MASS
Bisht, D.; Sethi, R.; Rangawal, G. +1 more
This paper investigates a poorly studied open cluster, NGC 5288, using 2MASS JHKS and the recently released Gaia DR3 astrometric and photometric data. The mean proper motions in right ascension and declination are estimated as (‑3.840 ± 0.230) and (‑1.934 ± 0.162) mas yr‑1 respectively. We also derive the age and distance of …
Estimating the energy flux of transverse waves associated with Kelvin-Helmholtz instability in solar coronal loops
Guo, Mingzhe; Gao, Yuhang; Van Doorsselaere, Tom +1 more
Context. The energy flux of kink waves in coronal loops has been estimated in previous studies. Recent numerical simulations have revealed that kink oscillations can induce a Kelvin-Helmholtz Instability (KHI) in magnetic flux tubes. This non-linear process breaks the assumptions that have typically been included in previous eigenmode analyses. Th…
The Evolution of Activity and Chemical Composition in Rosetta's Comet Targets across Multiple Apparitions: Complications for CS2 as the CS Parent in Comet Nuclei
Parker, Joel Wm.; Harris, Walter M.; Bodewits, Dennis +9 more
Jupiter-family comets are ephemeral small bodies injected into the inner solar system from the Kuiper Belt, doomed to either sublimate all their volatiles and become inert or violently shatter from the activity. We investigate two target candidates of the ESA Rosetta mission, comets 46P/Wirtanen and 67P/Churyumov-Gerasimenko, which had favorable a…
AGN candidates in the VVV near-IR galaxy catalogue
Smith, Leigh C.; Minniti, Dante; Alonso, M. Victoria +7 more
The goal of this work is to search for Active Galactic Nuclei (AGN) in the Galactic disc at very low latitudes with |b| < 2°. For this, we studied the five sources from the VVV near-infrared (IR) galaxy catalogue that have also WISE counterparts and present variability in the VIrac VAriable Classification Ensemble (VIVACE) catalogue. In the nea…
Cometary dust collected by MIDAS on board Rosetta. II. Particle shape descriptors and pristineness evaluation
Lasue, J.; Bentley, M. S.; Mannel, T. +4 more
Context. The MIDAS (Micro-Imaging Dust Analysis System) atomic force microscope on board the Rosetta comet orbiter investigated and measured the 3D topography of a few hundred of nm to tens of µm sized dust particles of 67P/Churyumov-Gerasimenko with resolutions down to a few nanometers, giving insights into the physical processes of our ear…
Asteroseismic Study of KUV03442+0719 with Parallax Constraints
Bischoff-Kim, Agnes
Hydrogen atmosphere white dwarf KUV03442+0719 was first reported as a pulsator by Gianninas et al. in 2006. Follow-up campaigns by Su et al. revealed more periods. Some spectroscopic results suggest that KUV03442+0719 has a slightly below-average mass and an effective temperature of 11,000 K. However, Gaia data (parallax and magnitude) suggest tha…