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Modeling Stellar Abundance Patterns Resulting from the Addition of Earth-like Planetary Material
Cowley, Charles R.; Bord, Donald J.; Yüce, Kutluay
We model the observed precision differential abundance patterns of three G-type dwarfs, assuming a mass of planetary or disk material was added to or subtracted from the atmosphere of the star. The two-parameter model is fit by linear regression. The stellar abundance patterns are corrected for Galactic chemical evolution (GCE). The differential a…
Detection of volatiles undergoing sublimation from 67P/Churyumov-Gerasimenko coma particles using ROSINA/COPS. I. The ram gauge
Altwegg, K.; Balsiger, H.; Rubin, M. +5 more
Context. The ESA Rosetta mission has allowed for an extensive in situ study of the comet 67P/Churyumov-Gerasimenko. In measurements performed by the ram gauge of the COmet Pressure Sensor (COPS), observed features are seen to deviate from the nominal ram gauge signal. This effect is attributable to the sublimation of the volatile fraction of comet…
uGMRT detection of cluster radio emission in low-mass Planck Sunyaev-Zel'dovich clusters
Raychaudhury, Somak; Paul, Surajit; Dabhade, Pratik +5 more
Low-mass (M500 < 5 × 1014 M⊙) galaxy clusters have been largely unexplored in radio observations, because of the inadequate sensitivity of existing telescopes. However, the upgraded Giant Metrewave Radio Telescope (uGMRT) and the Low Frequency ARray (LoFAR), with unprecedented sensitivity at low frequencies, hav…
The role of magnetospheric plasma in solar wind-magnetosphere coupling: A review
Walsh, Brian M.; Zou, Ying
A variety of magnetospheric plasma populations have been proposed to impact solar wind-magnetosphere coupling. These magnetospheric populations could mass load the dayside magnetopause and include the plasmaspheric plume, plasma cloak, ion plasma sheet, and dayside ion outflow. Each has different densities, ion composition, and spatial/temporal oc…
Resolving the outer ring of HD 38206 using ALMA and constraining limits on planets in the system
Launhardt, Ralf; Booth, Mark; Krivov, Alexander V. +3 more
HD 38206 is an A0V star in the Columba association, hosting a debris disc first discovered by IRAS. Further observations by Spitzer and Herschel showed that the disc has two components, likely analogous to the asteroid and Kuiper belts of the Solar system. The young age of this star makes it a prime target for direct imaging planet searches. Possi…
The magnetic system SMSS J1606-1000 as a period bouncer
Vennes, Stéphane; Buckley, D. A. H.; Zejda, M. +7 more
We report the discovery of a rare close binary system, SMSS J160639.78-100010.7, comprising a magnetic white dwarf with a field of about 30 MG and a brown dwarf. We measured an orbital period of 92 min which is consistent with the photometric period. Minimum and maximum light occur at the orbital quadratures Φ = 0.25 and 0.75, respectively, and ca…
Radio Counterparts of Gamma-Ray Sources in the Cygnus Region
Benaglia, Paula; Ishwara-Chandra, C. H.; Colazo, Marcelo E. +3 more
The view of the gamma-ray universe is being continuously expanded by space high-energy (HE) and ground-based very-high-energy (VHE) observatories. Yet, the angular resolution limitation still precludes a straightforward identification of these gamma-ray emitting sources. Radio observations are an effective tool for searching their possible counter…
Searching For Transiting Planets Around Halo Stars. I. Sample Selection and Validation
Zinn, Joel C.; Johnson, Jennifer A.; Wang, Ji +3 more
By measuring the elemental abundances of a star, we can gain insight into the composition of its initial gas cloud-the formation site of the star and its planets. Planet formation requires metals, the availability of which is determined by the elemental abundance. In the case where metals are extremely deficient, planet formation can be stifled. T…
Shocked Molecular Hydrogen and Broad CO Lines from the Interacting Supernova Remnant HB 3
Reach, W. T.; Rho, J.; Koo, B. -C. +6 more
We present the detections of shocked molecular hydrogen (H2) gas in near- and mid-infrared and broad CO in millimeter from the mixed-morphology supernova remnant (SNR) HB 3 (G132.7+1.3) using the Palomar Wide-field InfraRed Camera, the Spitzer GLIMPSE360 and Wide-field Infrared Survey Explorer (WISE) surveys, and the Heinrich Hertz Subm…
Network of Star Formation: Fragmentation Controlled by Scale-dependent Turbulent Pressure and Accretion onto the Massive Cores Revealed in the Cygnus-X GMC Complex
Qiu, Keping; Li, Guang-Xing; Cao, Yue
Molecular clouds have complex density structures produced by processes including turbulence and gravity. We propose a triangulation-based method to dissect the density structure of a molecular cloud and study the interactions between dense cores and their environments. In our approach, a Delaunay triangulation is constructed, which consists of edg…