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The Solar Neighborhood. XLVI. Revealing New M Dwarf Binaries and Their Orbital Architectures
Henry, Todd J.; Jao, Wei-Chun; Vrijmoet, Eliot Halley +1 more
We use 20 yr of astrometric data from the REsearch Consortium On Nearby Stars (RECONS) program on the Cerro Tololo Inter-American Observatory/SMARTS 0.9 m telescope to provide new insight into multiple star systems in the solar neighborhood. We provide new and updated parallaxes for 210 systems and derive nine high-quality astrometric orbits with …
Magnetosheath Jets and Plasmoids: Characteristics and Formation Mechanisms from Hybrid Simulations
Blanco-Cano, Xóchitl; Burgess, David; Trotta, Domenico +2 more
Magnetosheath jets and plasmoids are very common phenomena downstream of Earth's quasi-parallel bow shock. As the increase of the dynamic pressure is one of the principal characteristics of magnetosheath jets, the embedded paramagnetic plasmoids have been considered as an special case of the former. Although the properties of both types of structu…
SOFIA/FORCAST Galactic Center Legacy Survey: Overview
Morris, Mark R.; Longmore, Steven N.; García-Marín, Macarena +12 more
The Galactic Center contains some of the most extreme conditions for star formation in our Galaxy, as well as many other phenomena that are unique to this region. Given our relative proximity to the Galactic Center, we are able to study details of physical processes to a level that is simply not yet possible for more distant galaxies, yielding an …
Single magnetic white dwarfs with Balmer emission lines: a small class with consistent physical characteristics as possible signposts for close-in planetary companions
Gänsicke, Boris T.; Pala, Anna F.; Rodríguez-Gil, Pablo +4 more
We report the identification of SDSS J121929.45+471522.8 as the third apparently isolated magnetic (B ≃ 18.5 ± 1.0 MG) white dwarf exhibiting Zeeman-split Balmer emission lines. The star shows coherent variability at optical wavelengths with an amplitude of ≃0.03 mag and a period of 15.26 h, which we interpret as the spin period of the white dwarf…
Chemistry and Physics of a Low-metallicity Hot Core in the Large Magellanic Cloud
Onaka, Takashi; Aikawa, Yuri; Shimonishi, Takashi +5 more
We here present the results of 0.1 pc scale observations in 250 and 350 GHz toward a newly-discovered hot molecular core in a nearby low-metallicity galaxy, the Large Magellanic Cloud (LMC), with the Atacama Large Millimeter/submillimeter Array. A variety of C/N/O/Si/S-bearing molecules are detected toward the high-mass young stellar object, ST16.…
Carbonyl Sulfide (OCS): Detections in Comets C/2002 T7 (LINEAR), C/2015 ER61 (PanSTARRS), and 21P/Giacobini-Zinner and Stringent Upper Limits in 46P/Wirtanen
Vervack, Ronald J., Jr.; Kawakita, Hideyo; DiSanti, Michael A. +6 more
Carbonyl sulfide (OCS) is one of the sulfur-bearing molecules detected in different astronomical environments, including comets. The present-day sulfur chemistry in comets may reveal much about the origin of these ices and their subsequent processing history. Cometary sulfur molecules such as H2S, H2CS, SO2, SO, CS…
A census of the nearby Pisces-Eridanus stellar stream. Commonalities with and disparities from the Pleiades
Röser, Siegfried; Schilbach, Elena
Aims: Within a sphere of 400 pc radius around the Sun, we aim to search for members of the Pisces-Eridanus (Psc-Eri) stellar stream in the Gaia Data Release 2 data set. We compare basic astrophysical characteristics of the stream with those of the Pleiades.
Methods: We used a modified convergent-point method to identify stars with 2D vel…
Systematic versus statistical uncertainties in masses and magnifications of the Hubble Frontier Fields
Keeton, Charles R.; Raney, Catie A.; Brennan, Sean +1 more
The Hubble Frontier Fields data, along with multiple data sets obtained by other telescopes, have provided some of the most extensive constraints on cluster lenses to date. Multiple lens modelling teams analyzed the fields and made public a number of deliverables. By comparing these results, we can then undertake a unique and vital test of the sta…
Multi-resolution Filtering: An Empirical Method for Isolating Faint, Extended Emission in Dragonfly Data and Other Low Resolution Images
van Dokkum, Pieter; Abraham, Roberto; Danieli, Shany +6 more
We describe an empirical, self-contained method to isolate faint, large-scale emission in imaging data of low spatial resolution. Multi-resolution filtering (MRF) uses independent data of superior spatial resolution and point source depth to create a model for all compact and high surface brightness objects in the field. This model is convolved wi…
Possible Production of Solar Spicules by Microfilament Eruptions
Yurchyshyn, Vasyl; Moore, Ronald L.; Sterling, Alphonse C. +1 more
We examine Big Bear Solar Observatory (BBSO) Goode Solar Telescope (GST) high spatial resolution (0"06), high-cadence (3.45 s), Hα-0.8 Å images of central-disk solar spicules, using data of Samanta et al. We compare with coronal-jet chromospheric-component observations of Sterling et al. Morphologically, bursts of spicules, referred to as "enhance…