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The Effect of Current on Magnetic Null Topology during Turbulent Reconnection
Wang, Z.; Cao, J. B.; Liu, Y. Y. +5 more
Using data from the Cluster mission and the First-Order Taylor Expansion method, we investigate the spiral magnetic nulls nested in the diffusion region of turbulent reconnection in the magnetotail. We particularly focus on the relation between the magnetic null topologies and currents, which can be decomposed into a component perpendicular to spi…
ASAS J071404+7004.3 - a close, bright nova-like cataclysmic variable with gusty winds
Knigge, C.; Gänsicke, B. T.; Marsh, T. R. +11 more
Despite being bright (V ≃ 11.8) and nearby (d = 212 pc) ASAS J071404+7004.3 has only recently been identified as a nova-like cataclysmic variable. We present time-resolved optical spectroscopy obtained at the Isaac Newton and the Hiltner and McGraw-Hill Telescopes, together with Swift X-ray and ultraviolet observations. We combined these with TESS…
REXCOR: a model of the X-ray spectrum of active galactic nuclei that combines ionized reflection and a warm corona
Bianchi, S.; Petrucci, P. -O.; Matt, G. +6 more
The X-ray spectra of active galactic nuclei (AGNs) often exhibit an excess of emission above the primary power law at energies ≲2 keV. Two models for the origin of this 'soft excess' are ionized relativistic reflection from the inner accretion disc and Comptonization of thermal emission in a warm corona. Here, we introduce REXCOR, a new AGN X-ray …
The Solar ALMA Science Archive (SALSA). First release, SALAT, and FITS header standard
Mohan, Atul; Wedemeyer, Sven; Jafarzadeh, Shahin +5 more
In December 2016, the Atacama Large Millimeter/submillimeter Array (ALMA) carried out the first regular observations of the Sun. These early observations and the reduction of the respective data posed a challenge due to the novelty and complexity of observing the Sun with ALMA. The difficulties with producing science-ready, time-resolved imaging p…
SKYSURF: Constraints on Zodiacal Light and Extragalactic Background Light through Panchromatic HST All-sky Surface-brightness Measurements: II. First Limits on Diffuse Light at 1.25, 1.4, and 1.6 µm
Pirzkal, Nor; Casertano, Stefano; Driver, Simon P. +27 more
We present the first results from the HST Archival Legacy project "SKYSURF." As described in Windhorst et al., SKYSURF utilizes the large HST archive to study the diffuse UV, optical, and near-IR backgrounds and foregrounds in detail. Here, we utilize SKYSURF's first sky-surface-brightness measurements to constrain the level of near-IR diffuse Ext…
ACCESS: Confirmation of a Clear Atmosphere for WASP-96b and a Comparison of Light Curve Detrending Techniques
Nikolov, Nikolay; Fortney, Jonathan J.; Kirk, James +11 more
One of the strongest Na I features was observed in WASP-96b. To confirm this novel detection, we provide a new 475-825 nm transmission spectrum obtained with Magellan/IMACS, which indeed confirms the presence of a broad sodium absorption feature. We find the same result when reanalyzing the 400-825 nm VLT/FORS2 data. We also utilize synthetic data…
A gap in the double white dwarf separation distribution caused by the common-envelope evolution: astrometric evidence from Gaia
Toonen, Silvia; Belokurov, Vasily; Korol, Valeriya
The trajectory of the center of light of an unresolved binary is different from that of its center of mass. Binary-induced stellar centroid wobbling can therefore be detected as an excess in the goodness-of-fit of the single-star astrometric model. We use reduced χ2 of the astrometric fit in the Gaia Early Data Release 3 to detect the l…
Possible Evidence for Shear-driven Kelvin-Helmholtz Instability along the Boundary of Fast and Slow Solar Wind in the Corona
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +5 more
This paper reports the first possible evidence for the development of the Kelvin-Helmholtz (KH) instability at the border of coronal holes separating the associated fast wind from the slower wind originating from adjacent streamer regions. Based on a statistical data set of spectroscopic measurements of the UV corona acquired with the UltraViolet …
Assessing the Transiting Exoplanet Survey Satellite's Yield of Rocky Planets Around Nearby M Dwarfs
Bean, Jacob L.; Brady, Madison T.
Terrestrial planets are easier to detect around M dwarfs than other types of stars, making them promising for next-generation atmospheric characterization studies. The Transiting Exoplanet Survey Satellite (TESS) mission has greatly increased the number of known M-dwarf planets that we can use to perform population studies, allowing us to explore …
Binarity of a protostar affects the evolution of the disk and planets
Bergin, Edwin A.; Harsono, Daniel; Jørgensen, Jes K. +3 more
Nearly half of all stars similar to our Sun are in binary or multiple systems1, which may affect the evolution of the stars and their protoplanetary disks during their earliest stages. NGC 1333-IRAS2A is a young, Class 0, low-mass protostellar system located in the Perseus molecular cloud2. It is known to drive two bipolar ou…