Search Publications
Metis Observation of the Onset of Fully Developed Turbulence in the Solar Corona
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +70 more
This Letter reports the first observation of the onset of fully developed turbulence in the solar corona. Long time series of white-light coronal images, acquired by Metis aboard Solar Orbiter at 2 minutes cadence and spanning about 10 hr, were studied to gain insight into the statistical properties of fluctuations in the density of the coronal pl…
Accurate, Precise, and Physically Self-consistent Ages and Metallicities for 400,000 Solar Neighborhood Subgiant Branch Stars
Reggiani, Henrique; Schlaufman, Kevin C.; Nataf, David M. +1 more
Age is the most difficult fundamental stellar parameter to infer for isolated stars. While isochrone-based ages are in general imprecise for both main-sequence dwarfs and red giants, precise isochrone-based ages can be obtained for stars on the subgiant branch transitioning from core to shell hydrogen burning. We synthesize Gaia Data Release 3–bas…
Velocity-space Signatures of Resonant Energy Transfer between Whistler Waves and Electrons in the Earth's Magnetosheath
Verscharen, Daniel; Klein, Kristopher G.; Li, Hui +4 more
Wave-particle interactions play a crucial role in transferring energy between electromagnetic fields and charged particles in space and astrophysical plasmas. Despite the prevalence of different electromagnetic waves in space, there is still a lack of understanding of fundamental aspects of wave-particle interactions, particularly in terms of ener…
High-resolution X-Ray Spectroscopy of Interstellar Iron toward Cygnus X-1 and GX 339-4
Lee, Julia C.; Paerels, Frits; Gatuzz, Efrain +7 more
We present a high-resolution spectral study of Fe L-shell extinction by the diffuse interstellar medium (ISM) in the direction of the X-ray binaries Cygnus X-1 and GX 339–4, using the XMM-Newton reflection grating spectrometer. The majority of interstellar Fe is suspected to condense into dust grains in the diffuse ISM, but the compounds formed fr…
The Leakage of Lyman-continuum Photons from a Major Merger at z ∼ 1
Saha, Kanak; Herenz, Edmund Christian; Maulick, Soumil +1 more
We report the detection of Lyman-continuum (LyC) photons from a massive interacting system at z = 1.097 in the Hubble Ultra Deep Field. The LyC detection is made in the far-ultraviolet F154W band of the UVIT telescope on board AstroSat. Both JWST and Hubble Space Telescope (HST) imaging of the system reveal signs that it is a likely merger. In par…
An Eccentric Binary with a Misaligned Circumbinary Disk
Fang, Min; Huang, Yang; Dai, Fei +4 more
We present spectroscopic and photometric observations of Bernhard-2, which was previously identified as a candidate system that hosts a misaligned circumbinary disk. Our spectroscopic measurements confirm that Bernhard-2 indeed contains an eccentric (e = 0.69 ± 0.08) binary and thus that the periodic variability in the photometric light curve is b…
Chemo-dynamical Evolution of Simulated Satellites for a Milky Way–like Galaxy
Beers, Timothy C.; Anguiano, Borja; Ishigaki, Miho N. +5 more
The chemical abundances of Milky Way's (MW's) satellites reflect their star formation histories (SFHs), yet, due to the difficulty of determining the ages of old stars, the SFHs of most satellites are poorly measured. Ongoing and upcoming surveys will obtain around 10 times more medium-resolution spectra for stars in satellites than are currently …
Modeling X-Ray and Gamma-Ray Emission from Redback Pulsar Binaries
An, Hongjun; Wadiasingh, Zorawar; Sim, Minju
We investigated the multiband emission from the pulsar binaries XSS J12270‑4859, PSR J2039‑5617, and PSR J2339‑0533, which exhibit orbital modulation in the X-ray and gamma-ray bands. We constructed the sources' broadband spectral energy distributions and multiband orbital light curves by supplementing our X-ray measurements with published gamma-r…
Investigations of Massive Filaments and Star Formation (INFANT). I. Core Identification and Core Mass Function
Sanhueza, Patricio; Gu, Qilao; Liu, Tie +16 more
Filamentary structures are ubiquitously found in high-mass star-forming clouds. To investigate the relationship between filaments and star formation, we carry out the INFANT (Investigations of Massive Filaments and Sar Formation) survey, a multiscale, multiwavelength survey of massive filamentary clouds with Atacama Large Millimeter/submillimeter …
Mixed Source Region Signatures inside Magnetic Switchback Patches Inferred by Heavy Ion Diagnostics
Landi, Enrico; Bale, Stuart D.; Owen, Christopher J. +13 more
Since Parker Solar Probe's (Parker's) first perihelion pass at the Sun, large-amplitude Alfvén waves grouped in patches have been observed near the Sun throughout the mission. Several formation processes for these magnetic switchback patches have been suggested with no definitive consensus. To provide insight into their formation, we examine the h…