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Trumpler 16-26: a new centrifugal magnetosphere star discovered via SDSS/APOGEE H-band spectroscopy
Rivinius, Thomas; Nidever, David L.; Labadie-Bartz, Jonathan +6 more
We report the discovery of a new example of the rare class of highly magnetized, rapidly rotating, helium enhanced, early B stars that produce anomalously wide hydrogen emission due to a centrifugal magnetosphere (CM). The star is Trumpler 16-26, a B1.5 V member of the Trumpler 16 open cluster. A CM was initially suspected based on hydrogen Bracke…
Parallel Plasma Loops and the Energization of the Solar Corona
Tiwari, Sanjiv K.; Golub, Leon; Winebarger, Amy R. +15 more
The outer atmosphere of the Sun is composed of plasma heated to temperatures well in excess of the visible surface. We investigate short cool and warm (<1 MK) loops seen in the core of an active region to address the role of field-line braiding in energizing these structures. We report observations from the High-resolution Coronal imager (Hi-C)…
The progenitor of the Vela pulsar
Kochanek, C. S.
With Gaia parallaxes, it is possible to study the stellar populations associated with individual Galactic supernova remnants (SNRs) to estimate the mass of the exploding star. Here, we analyse the luminous stars near the Vela pulsar and SNR to find that its progenitor was probably ($\mathrel {\raise.3ex\rm{\gt }\lower0.6ex\rm{\sim }}90\rm \,per\,c…
Comparing and Contrasting the Properties of the Inner Heliosphere for the Three Most Recent Solar Minima
Downs, Cooper; Riley, Pete; Linker, Jon A. +2 more
The previous three solar cycles have ended in progressively more quiescent conditions, suggesting a continual slide into an ever deeper minimum state. Although the Sun's magnetic field is undoubtedly responsible for this quiescence, it is not clear how changes in its structure and strength modulate the properties of the solar wind. In this study, …
CWISE J014611.20-050850.0AB: The Widest Known Brown Dwarf Binary in the Field
Shkolnik, Evgenya; Meisner, Aaron M.; Cushing, Michael C. +17 more
While stars are often found in binary systems, brown dwarf binaries are much rarer. Brown dwarf-brown dwarf pairs are typically difficult to resolve because they often have very small separations. Using brown dwarfs discovered with data from the Wide-field Infrared Survey Explorer (WISE) via the Backyard Worlds: Planet 9 citizen science project, w…
Climatology of the CO Vertical Distribution on Mars Based on ACS TGO Measurements
Montmessin, Franck; Trokhimovskiy, Alexander; Alday, Juan +13 more
Carbon monoxide is a non-condensable gas in the Martian atmosphere produced by the photolysis of CO2. Its abundance responds to the condensation and sublimation of CO2 from the polar caps, resulting in seasonal variations of the CO mixing ratio. ACS onboard the ExoMars Trace Gas Orbiter have measured CO in infrared bands by s…
Is the Core-cusp Problem a Matter of Perspective? Jeans Anisotropic Modeling against Numerical Simulations
Tian, Hao; Grand, Robert J. J.; Wang, Wenting +14 more
Mock member stars for 28 dwarf galaxies are constructed from the cosmological AURIGA simulation, which reflects the dynamical status of realistic stellar tracers. Axisymmetric Jeans Anisotropic Multi-Gaussian Expansion (JAM) modeling is applied to 6000 star particles for each system to recover the underlying matter distribution. The stellar or dar…
The role and contribution of magnetic fields, characterized via their magnetic flux, to the statistical structuring of the solar atmosphere
Li, K. J.; Xu, J. C.; Feng, W.
The anomalous heating of the solar upper atmosphere is one of the eight key problems in modern astronomy. Moreover, the stratification of the solar atmosphere is an outstanding key-problem in solar physics. In this study, a hot butterfly-like pattern is found to run through the chromosphere to the corona lying right on top of the magnetic butterfl…
Estimating the Convective Turnover Time
Henry, Todd J.; Wright, Nicholas J.; Jao, Wei-Chun +2 more
The introduction of the Rossby number (R0), which incorporates the convective turnover time (τ), in 1984 was a pioneering idea for understanding the correlation between stellar rotation and activity. The convective turnover time, which cannot be measured directly, is often inferred using existing τ-mass or τ-color relations, typically e…
Circular Polarization Observations of Type II Solar Radio Bursts and the Coronal Magnetic Field
Ramesh, R.; Kathiravan, C.; Chellasamy, E. Ebenezer
It is well known that magnetic field strength (B) in the solar corona can be calculated using the Alfvén Mach number (M A ) and Alfvén speed (v A ) of the magnetohydrodynamic shock waves associated with coronal type II radio bursts. We show that observations of weak circularly polarized emission associated with the harmonic…