Search Publications
Causal Interaction between the Subsurface Rotation Rate Residuals and Radial Magnetic Field in Different Timescales
Howe, Rachel; Inceoglu, Fadil; Loto'aniu, Paul T. M.
We studied the presence and spatiotemporal characteristics and evolution of the variations in the differential rotation rates and radial magnetic fields in the Schwabe and quasi-biennial-oscillation (QBO) timescales. To achieve these objectives, we used rotation rate residuals and radial magnetic field data from the Michelson Doppler Imager on the…
A Multiwavelength Study of the Highly Asymmetrical Debris Disk around HD 111520
Crotts, Katie A.; Matthews, Brenda C.; Duchêne, Gaspard +7 more
We observed the nearly edge-on debris disk system HD 111520 at the HJ and K1 near-infrared (NIR) bands using both the spectral and polarization modes of the Gemini Planet Imager. With these new observations, we have performed an empirical analysis in order to better understand the disk morphology and its highly asymmetrical nature. We find that th…
The Common Envelope Origins of the Fast Jet in the Planetary Nebula M 3-38
Guerrero, M. A.; Toalá, J. A.; Rodríguez-López, C. +3 more
We present the analysis of Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía (MEGARA) high-dispersion integral field spectroscopic observations of the bipolar planetary nebula (PN) M 3-38. These observations unveil the presence of a fast outflow aligned with the symmetry axis of M 3-38 that expands with a velocity of up to ±225 km s
Modeling a Coronal Mass Ejection as a Magnetized Structure with EUHFORIA
Singh, Jagdev; Asvestari, E.; Sindhuja, G. +1 more
We studied an Earth-directed coronal mass ejection (CME) that erupted on 2015 March 15. Our aim was to model the CME flux rope as a magnetized structure using the European Heliospheric Forecasting Information Asset (EUHFORIA). The flux rope from eruption data (FRED) output was applied to the EUHFORIA spheromak CME model. In addition to the geometr…
Millisecond Pulsars in Dense Star Clusters: Evolution, Scaling Relations, and the Galactic-center Gamma-Ray Excess
Ye, Claire S.; Fragione, Giacomo
The number of millisecond pulsars (MSPs) observed in Milky Way globular clusters has increased explosively in recent years, but the underlying population is still uncertain due to observational biases. We use state-of-the-art N-body simulations to study the evolution of MSP populations in dense star clusters. These cluster models span a wide range…
The Effect of Molecular Cloud Properties on the Kinematics of Stars Formed in the Trifid Region
Gromadzki, Mariusz; Feigelson, Eric D.; Hillenbrand, Lynne A. +5 more
The dynamical states of molecular clouds may affect the properties of the stars they form. In the vicinity of the Trifid Nebula (d = 1180 ± 25 pc), the main star cluster (Trifid Main) lies within an expanding section of the molecular cloud; however, ~0.°3 to the north (Trifid North), the cloud's velocity structure is more tranquil. We acquired a C…
Chandra Observations of Six Peter Pan Disks: Diversity of X-Ray-driven Internal Photoevaporation Rates Does Not Explain Their Rare Longevity
Kounkel, Marina; Kuchner, Marc J.; Wisniewski, John P. +6 more
We present Chandra X-ray observations of six previously identified Peter Pan objects, rare ∼40 Myr systems with evidence of primordial disk retention. We observe X-ray luminosities (0.8–3.0 keV) ranging from log L x ∼ 27.7–29.1. We find that our Peter Pan sample exhibits X-ray properties similar to that of weak-lined T Tauri stars and…
Spatial Structures in the Globular Cluster Distribution of Fornax Cluster Galaxies
Zezas, Andreas; Fabbiano, Giuseppina; Paolillo, Maurizio +3 more
We report the discovery of statistically significant spatial structures in the projected two-dimensional distributions of Globular Cluster (GC) systems of 10 galaxies that are among the brightest in the Fornax Cluster. We use a catalog of GCs extracted from the Hubble Space Telescope Advanced Camera for Surveys Fornax Cluster Survey imaging data. …
A Comprehensive Study of the Young Cluster IRAS 05100+3723: Properties, Surrounding Interstellar Matter, and Associated Star Formation
Zavagno, A.; Samal, M. R.; Ojha, D. K. +13 more
We present a comprehensive multiwavelength investigation of a likely massive young cluster "IRAS 05100+3723" and its environment with the aim to understand its formation history and feedback effects. We find that IRAS 05100+3723 is a distant (~3.2 kpc), moderate-mass (~500 M ⊙), young (~3 Myr) cluster with its most massive star being an…
The Magnetic Field Environment of Active Region 12673 That Produced the Energetic Particle Events of September 2017
Green, Lucie M.; Yardley, Stephanie L.; Mihailescu, Teodora +2 more
Forecasting solar energetic particles (SEPs), and identifying flares/coronal mass ejections (CMEs) from active regions (ARs) that will produce SEP events in advance is extremely challenging. We investigate the magnetic field environment of AR 12673, including the AR's magnetic configuration, the surrounding field configuration in the vicinity of t…