33 citations · 70 across the 13 of their papers we have counts for
15 papers
Investigation of Calcium Dust in the Interstellar Medium
Ya-Yu Chu, Sascha Zeegers, Hsien Shang +7
Calcium is a highly depleted element in the interstellar medium (ISM), however its composition in the solid phase remains elusive. The detection of Ca-bearing dust has been limited…
Iterative Poisson Solvers for Self-gravity with the GPU Code Astaroth
Ruben Krasnopolsky, Touko Puro, Wei-Wen Li +5
We present the development and benchmarking of Poisson solvers for graphics processing units (GPUs). Implemented in the Astaroth platform, the solvers feature high computational ef…
Polytropic Wind-Driven Bubbles and their Shock Structures in Radially Stratified Ambient Media
Dmitrii Zagorulia, Hsien Shang, Ruben Krasnopolsky
We extend the analytic expressions for polytropic wind-driven bubbles and their shock structures, formulated initially in Koo and McKee 1992(a,b), focusing on spherically symmetric…
A Spectroastrometric Study of the Low-velocity Wind from DG Tau A
Yu-Ru Chou, Michihiro Takami, Shin-Ping Lai +9
We obtained high spectral resolution spectra ( 2.5 km s) for DG Tau A from 4800 Å to 7500 Å using Subaru High Dispersion Spectrograph (HDS) for the first time. Th…
Evidence of a Disk-wind Origin for Fluorescent H in Classical T Tauri Stars
Matt Kalscheur, Kevin France, Brunella Nisini +8
We use FUV spectra of 36 T Tauri stars, predominately from 's ULLYSES program, to examine the kinematic properties of fluorescent H emission li…
Chemical Fingerprints of M Dwarfs: High-Resolution Spectroscopy on 31 M Dwarfs with SPIRou
Farbod Jahandar, René Doyon, Étienne Artigau +10
We extend the methodology introduced by Jahandar et al. (2024) to determine the effective temperature and chemical abundances of 31 slowly-rotating solar neighborhood M dwarfs (M1-…
Formation of limb-brightened radio jets by angle-dependent energy extraction from rapidly rotating black holes
Kouichi Hirotani, Hsien Shang, Ruben Krasnopolsky +1
By general relativistic magnetohydrodynamic simulations, it is suggested that the rotational energy of a rapidly rotating black hole (BH) is preferentially extracted along the magn…
A Unified Model for Bipolar Outflows from Young Stars: Kinematic and Mixing Structures in HH 30
Tsung-Han Ai, Chun-Fan Liu, Hsien Shang +2
The young stellar source HH 30 is a textbook example of an ionic optical jet originating from a disk in an edge-on system shown by the HST. It has a remnant envelope in CO o…
An Efficient Algorithm for Astrochemical Systems Using Stoichiometry Matrices
Kazutaka Motoyama, Ruben Krasnopolsky, Hsien Shang +2
Astrochemical simulations are a powerful tool for revealing chemical evolution in the interstellar medium. Astrochemical calculations require efficient processing of large matrices…
Exploring the Formation of Resistive Pseudodisks with the GPU Code Astaroth
Miikka S. Väisälä, Hsien Shang, Daniele Galli +2
Pseudodisks are dense structures formed perpendicular to the direction of the magnetic field during the gravitational collapse of a molecular cloud core. Numerical simulations of t…
A Unified Model for Bipolar Outflows from Young Stars: Apparent Magnetic Jet Acceleration
Hsien Shang, Ruben Krasnopolsky, Chun-Fan Liu
We explore a new, efficient mechanism that can power toroidally magnetized jets up to two to three times their original terminal velocity after they enter a self-similar phase of m…
A Unified Model for Bipolar Outflows from Young Stars: Kinematic Signatures of Jets, Winds, and Their Magnetic Interplay with the Ambient Toroids
Hsien Shang, Chun-Fan Liu, Ruben Krasnopolsky +1
Kinematic signatures of the jet, winds, multicavities, and episodic shells arising in the unified model of bipolar outflows developed in Shang et al.\ (2020), in which an outflow f…
Two-dimensional Particle-in-Cell simulations of axisymmetric black hole magnetospheres: angular dependence of the Blandford-Znajek flux
Kouichi Hirotani, Hsien Shang, Ruben Krasnopolsky +1
We examine the temporary evolution of axisymmetric magnetospheres around rapidly rotating black holes (BHs), by applying our two-dimensional particle-in-cell simulation code. Assum…
The Science Cases for Building a Band 1 Receiver Suite for ALMA
J. Di Francesco, D. Johnstone, B. C. Matthews +34
We present the various science cases for building Band 1 receivers as part of ALMA's ongoing Development Program. We describe the new frequency range for Band 1 of 35-52 GHz, a ran…
The Science Case for Building a Band 1 Receiver Suite for ALMA
J. Di Francesco, D. Johnstone, B. Matthews +23
We present a set of compelling science cases for the ALMA Band 1 receiver suite. For these cases, we assume in tandem the updated nominal Band 1 frequency range of 35-50 GHz with a…