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Observations of magnetic fields surrounding LkH 101 taken by the BISTRO survey with JCMT-POL-2
Nguyen Bich Ngoc, Pham Ngoc Diep, Harriet Parsons +146
We report the first high spatial resolution measurement of magnetic fields surrounding LkH 101, a part of the Auriga-California molecular cloud. The observations were taken with…
JCMT POL-2 and BISTRO Survey observations of magnetic fields in the L1689 molecular cloud
Kate Pattle, Shih-Ping Lai, James Di Francesco +26
We present 850m polarization observations of the L1689 molecular cloud, part of the nearby Ophiuchus molecular cloud complex, taken with the POL-2 polarimeter on the James Clerk…
Variation of dust properties with cosmic time implied by radiative torque disruption
Thiem Hoang
Dust properties within a galaxy are known to change from the diffuse medium to dense clouds due to increased local gas density. However, the question of whether dust properties cha…
Probing Interstellar Grain Growth Through Polarimetry in the Taurus Cloud Complex
John E. Vaillancourt, B-G Andersson, Dan P. Clemens +4
The optical and near-infrared (OIR) polarization of starlight is typically understood to arise from the dichroic extinction of that light by dust grains whose axes are aligned with…
Grain alignment and disruption by radiative torques in dense molecular clouds and implication for polarization holes
Thiem Hoang, Le Ngoc Tram, Hyeseung Lee +2
Dust polarization induced by aligned grains is widely used to study magnetic fields in various environments, including star-forming regions. However, the question of to what optica…
Alignment and rotational disruption of dust
A. Lazarian, Thiem Hoang
We reveal a deep connection between alignment of dust grains by RAdiative torques (RATs) and MEchanical Torques (METs) and rotational disruption of grains introduced by Hoang et al…
Modelling Grain Rotational Disruption by Radiative Torques and Extinction of Active Galactic Nuclei
Nguyen Chau Giang, Thiem Hoang
Extinction curves observed toward individual Active Galactic Nuclei (AGN) usually show a steep rise toward far-ultraviolet (FUV) wavelengths and can be described by the Small Magel…
Observational evidence for rotational desorption of Complex Molecules by radiative torques from Orion BN/KL
Le Ngoc Tram, Hyeseung Lee, Thiem Hoang +5
Complex Organic Molecules (COMs) are believed to form in the ice mantle of dust grains and are released to the gas by thermal sublimation when grain mantles are heated to temperatu…
The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333
Yasuo Doi, Tetsuo Hasegawa, Ray S. Furuya +135
We present new observations of the active star-formation region NGC 1333 in the Perseus molecular cloud complex from the James Clerk Maxwell Telescope B-Fields In Star-forming Regi…
Detectability of Thermal Emission from Sub-Relativistic Objects
Thiem Hoang, Abraham Loeb
We calculate the surface temperature and the resulting brightness of sub-relativistic objects moving through the Solar system due to collisional heating by gas and radiative heatin…
Rotational Disruption of Astrophysical Dust and Ice: Theory and Applications
Thiem Hoang
Dust is an essential component of the interstellar medium (ISM) and plays an important role in many different astrophysical processes and phenomena. Traditionally, dust grains are…
Understanding polarized dust emission from Ophiuchi A in light of grain alignment and disruption by radiative torques
Le Ngoc Tram, Thiem Hoang, Hyeseung Lee +5
The alignment of dust grains with the ambient magnetic field produces polarization of starlight as well as thermal dust emission. Using the archival SOFIA/HAWC+ polarimetric data o…
Alignment of irregular grains by radiative torques: efficiency study
Joonas Herranen, A. Lazarian, Thiem Hoang
We study the efficiency of grain alignment by radiative torques (RATs) for an ensemble of irregular grains. The grains are modeled as ensembles of oblate and prolate spheroids, def…
Destruction of molecular hydrogen ice and Implications for 1I/2017 U1 (`Oumuamua)
Thiem Hoang, Abraham Loeb
The first interstellar object observed in our solar system, 1I/2017 U1 (`Oumuamua), exhibited a number of peculiar properties, including extreme elongation and acceleration excess.…
Can Planet Nine Be Detected Gravitationally by a Sub-Relativistic Spacecraft?
Thiem Hoang, Abraham Loeb
Planet 9 was proposed as an explanation for the clustering of orbits for some trans-Neuptunian objects. Recently, the use of a sub-relativistic spacecraft was proposed to indirectl…
Evolution of Dust and Water Ice in Cometary Comae by Radiative Torques
Thiem Hoang, Ngo-Duy Tung
Comets provide unique information about the physical and chemical properties of the environment in which the Solar system was formed. Understanding how cometary dust and ice evolve…
Effect of Dust Rotational Disruption by Radiative Torques and Implications for F-corona decrease revealed by the Parker Solar Probe
Thiem Hoang, Alex Lazarian, Hyeseung Lee +3
The first-year results from the Parker Solar Probe (PSP) reveal a gradual decrease of F-coronal dust from distances of AU (or the inner elongations of $\sim 9.22- 1…
Effects of rotational disruption on the evolution of grain size distribution in galaxies
Hiroyuki Hirashita, Thiem Hoang
Interstellar dust grains can be spun up by radiative torques, and the resulting centrifugal force may be strong enough to disrupt large dust grains. We examine the effect of this r…
Rotational Disruption of Dust and Ice by Radiative Torques in Protoplanetary Disks and Implications for Observations
Ngo-Duy Tung, Thiem Hoang
Dust and ice mantles on dust grains play an important role in various processes in protoplanetary disks (PPDs) around a young star, including planetesimal formation, surface chemis…