Search Publications
Missions
Journals
Publication Years
Tracing Accretion onto Herbig Ae/Be Stars Using the Brγ Line
Calvet, Nuria; Espaillat, Catherine C.; Grant, Sierra L. +2 more
Accretion plays an important role in protoplanetary disk evolution, and it is thought that the accretion mechanism changes between low- and high-mass stars. Here we characterize accretion in intermediate-mass, pre-main-sequence Herbig Ae/Be (HAeBe) stars to search for correlations between accretion and system properties. We present new high-resolu…
An Old, Metal-rich Accreted Stellar Component in the Milky Way Stellar Disk
Feuillet, Diane K.; Feltzing, Sofia; Bensby, Thomas +1 more
We study the possibility that the Milky Ways' cool stellar disk includes mergers with ancient stars. Galaxies are understood to form in a hierarchical manner, where smaller (proto-)galaxies merge into larger ones. Stars in galaxies, like the Milky Way, contain in their motions and elemental abundance tracers of past events and can be used to disen…
Geminga SNR: Possible Candidate of the Local Cosmic-Ray Factory
Yuan, Qiang; Liu, Wei; Bi, Xiao-Jun +5 more
The precise measurements of energy spectra and anisotropy could help us uncover the local cosmic-ray accelerators. Our recent works have shown that spectral hardening above 200 GeV in the energy spectra and transition of large-scale anisotropy at ~100 TeV are of local source origin. Less than 100 TeV, both spectral hardening and anisotropy explici…
Charge State Calculation for Global Solar Wind Modeling
Landi, E.; van der Holst, B.; Szente, J.
The charge state composition of the solar wind carries information about the electron temperature, density, and velocity of plasma in the solar corona that cannot always be measured with remote sensing techniques, due to limitations in instrumental sensitivity and field of view as well as line-of-sight integration issues. However, in situ measurem…
Explaining NOMAD D/H Observations by Cloud-Induced Fractionation of Water Vapor on Mars
Aoki, S.; Vandaele, A. C.; Daerden, F. +25 more
The vertical profiles of water vapor and its semi-heavy hydrogen isotope HDO provided by instruments on ExoMars Trace Gas Orbiter constitute a unique new data set to understand the Martian water cycle including its isotopic composition. As water vapor undergoes hydrogen isotopic fractionation upon deposition (but not sublimation), the D/H isotopic…
Deep diving off the 'Cosmic Cliffs': previously hidden outflows in NGC 3324 revealed by JWST
Smith, Nathan; Reiter, Megan; Morse, Jon A. +3 more
We present a detailed analysis of the protostellar outflow activity in the massive star-forming region NGC 3324, as revealed by new Early Release Observations (EROs) from the James Webb Space Telescope (JWST). Emission from numerous outflows is revealed in narrow-band images of hydrogen Paschen α (Paα) and molecular hydrogen. In particular, we rep…
Testing the Limits of AGN Feedback and the Onset of Thermal Instability in the Most Rapidly Star-forming Brightest Cluster Galaxies
McNamara, Brian R.; Donahue, Megan; Voit, G. Mark +8 more
We present new, deep, narrow- and broadband Hubble Space Telescope observations of seven of the most star-forming brightest cluster galaxies (BCGs). Continuum-subtracted [OII] maps reveal the detailed, complex structure of warm (T ~ 104 K) ionized gas filaments in these BCGs, allowing us to measure spatially resolved star formation rate…
Interplanetary Ion Flux Dropouts Across Multiple 3He-Rich Events
Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F.; Allen, R. C. +3 more
Solar Orbiter, a joint ESA/NASA mission, is studying the Sun and inner heliosphere in greater detail than ever before. Launched in February 2020, Solar Orbiter has already completed its first three orbits, reaching perihelia of 0.5 au from the Sun in June 2020, February and August 2021. During the first 2 years in orbit, Solar Orbiter observed mul…
A Simulation-driven Deep Learning Approach for Separating Mergers and Star-forming Galaxies: The Formation Histories of Clumpy Galaxies in All of the CANDELS Fields
Conselice, Christopher J.; Ferreira, Leonardo; Kuchner, Ulrike +1 more
Being able to distinguish between galaxies that have recently undergone major-merger events, or are experiencing intense star formation, is crucial for making progress in our understanding of the formation and evolution of galaxies. As such, we have developed a machine-learning framework based on a convolutional neural network to separate star-for…
Discovery of a coherent, wave-like velocity pattern for the Radcliffe wave
Li, Guang-Xing; Chen, Bing-Qiu
Recent studies discovered that part of the Gould Belt belongs to a 2.7 kpc-long coherent, thin wave consisting of a chain of clouds, where a damped undulation pattern has been identified from the spatial arrangement of the clouds. We use the proper motions of young stellar objects anchored inside the clouds to study the kinematic structure of the …