Search Publications
A Radio Counterpart to a Jupiter-mass Binary Object in Orion
Zapata, Luis A.; Rodríguez, Luis F.; Loinard, Laurent
Using James Webb Space Telescope near-infrared data of the inner Orion Nebula, Pearson & McCaughrean detected 40 Jupiter-mass binary objects (JuMBOs). These systems are not associated with stars and their components have masses of giant Jupiter-like planets and separations in the plane of the sky of order ~100 au. The existence of these wide f…
Magnetic Activity of Millions of G-type Stars Based on the LAMOST DR10 Low-resolution Spectral and TESS Light-curve Surveys and the Future CSST Survey
Han, Xianming L.; Misra, Prabhakar; Zhang, Li-yun +5 more
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) data release 10 (DR10) provides over 3 million G-type stellar spectra, which are important for the study of chromospheric activity of solar-like stars. We have used the iSpec program to perform spectral subtraction on the G-type stellar spectra obtained from LAMOST DR10 with a …
Role of Polycyclic Aromatic Hydrocarbons with Edge Defects in Explaining Astronomical Infrared Emission Observations
Boersma, C.; Peeters, E.; Maragkoudakis, A. +2 more
A systematic study was performed on the spectral properties of polycyclic aromatic hydrocarbons (PAHs) with edge defects using harmonic density functional theory calculations. Their potential astronomical relevance was assessed through direct comparison with NIRSpec and MIRI-MRS spectra of the atomic photodissociation region of the Orion Bar from …
The Composition of Saturn's Rings
Nicholson, Philip D.; Johnson, Robert E.; Hedman, Matthew M. +13 more
The origin and evolution of Saturn's rings is critical to understanding the Saturnian system as a whole. Here, we discuss the physical and chemical composition of the rings, as a foundation for evolutionary models described in subsequent chapters. We review the physical characteristics of the main rings, and summarize current constraints on their …
zoomies: A Tool to Infer Stellar Age from Vertical Action in Gaia Data
Hogg, David W.; Angus, Ruth; Price-Whelan, Adrian M. +3 more
Stellar age measurements are fundamental to understanding a wide range of astronomical processes, including Galactic dynamics, stellar evolution, and planetary system formation. However, extracting age information from main-sequence stars is complicated, with techniques often relying on age proxies in the absence of direct measurements. The Gaia d…
A Large Jet Narrow-line Seyfert 1 Galaxy: Observations from Parsec to 100 kpc Scales
Laor, Ari; Behar, Ehud; La Mura, Giovanni +11 more
We present new 1.5–8.5 GHz Very Long Baseline Array (VLBA) observations and 0.32–1.26 GHz Giant Meterwave Radio Telescope (GMRT) observations of J0354‑1340, which is the only known radio-quiet (RQ) or radio-intermediate (RI) narrow-line Seyfert 1 galaxy with a 100 kpc, two-sided radio jet. A parsec-scale, one-sided jet in the southeastern directio…
The Distance to the S147 Supernova Remnant
Kochanek, C. S.; Caldwell, Nelson; Raymond, John C.
In the absence of a parallax distance to a pulsar or a surviving binary in a supernova remnant (SNR), distances to Galactic SNRs are generally very uncertain. However, by combining Gaia data with wide-field, multifiber echelle spectroscopy, it is now possible to obtain accurate distances to many SNRs with limited extinction by searching for the ap…
Weak secondary cyclotron line in eclipsing high-mass X-ray binary Cen X-3
Misra, Ranjeev; Dangal, Pravat; Chakradhari, N. K. +1 more
We report the time-resolved spectroscopy results from two observations of Centaurus X-3, over one binary orbit with AstroSat and two binary orbits with Nuclear Spectroscopic Telescope Array (NuSTAR). NuSTAR covered two intensity states where the light curve showed transition in count rate from first to second binary orbit by a factor of ~3. A phen…
Switchback Patches Evolve into Microstreams via Magnetic Relaxation
Velli, Marco; Owen, Christopher J.; Kasper, Justin +5 more
Switchbacks, defined as Alfvénic reversals in magnetic field polarity, can dissipate their magnetic energy with heliocentric distance. To further investigate this, two distinct solar wind parcels tracing back to a similar solar source region were examined during a radial alignment between Parker Solar Probe (@25.8RS) and Solar Orbiter (@152RS). Th…
A Broad Line-width, Compact, Millimeter-bright Molecular Emission Line Source near the Galactic Center
Morris, Mark R.; Smith, Howard A.; Caselli, Paola +37 more
A compact source, G0.02467–0.0727, was detected in Atacama Large Millimeter/submillimeter Array 3 mm observations in continuum and very broad line emission. The continuum emission has a spectral index α ≈ 3.3, suggesting that the emission is from dust. The line emission is detected in several transitions of CS, SO, and SO2 and exhibits …