A5091134961- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Space Exploration and Technology
- Spectroscopy and Laser Applications
- SAS software applications and methods
University of Oklahoma
2019-2024
Clemson University
2016
Abstract We have conducted a survey of 328 protostars in the Orion molecular clouds with Atacama Large Millimeter/submillimeter Array at 0.87 mm resolution ∼0.″1 (40 au), including observations Very 9 toward 148 ∼0.″08 (32 au). This is largest multiwavelength this by an order magnitude. use dust continuum emission and to measure disk radii masses Class 0, I, flat-spectrum protostars, characterizing evolution these properties protostellar phase. The mean for are <?CDATA...
Abstract We present Atacama Large Millimeter/submillimeter Array (0.87 mm) and Very (9 observations toward OMC-2 FIR4 FIR3 within the Orion integral-shaped filament, thought to be two of nearest regions intermediate-mass star formation. characterize continuum sources these on ∼40 au (0.″1) scales associated molecular line emission at a factor ∼30 better resolution than previous similar wavelengths. identify six compact FIR4, four in FIR3, one additional source just outside FIR4. This is...
Abstract We report Atacama Large Millimeter/submillimeter Array and Very continuum observations that potentially identify the four youngest protostars in Orion Molecular Clouds taken as part of VANDAM program. These are distinguished by bright, extended, irregular emission at 0.87 8 mm optically thick mm. structures distinct from disk or point-like morphologies seen toward other protostars. The implies temperatures 41–170 K, requiring internal heating. bright masses 0.5–1.2 M ⊙ assuming...
Abstract We present new Atacama Large Millimeter/submillimeter Array observations toward a compact (∼230 au separation) triple protostar system, L1448 IRS3B, at 879 μ m with 011 × 005 resolution. Spiral arm structure within the circum-multiple disk is well resolved in dust continuum and we detect known wide (∼2300 au) companion, IRS3A, also resolving possible spiral substructure. Using dense gas tracers, C 17 O ( J = 3 2), H 13 CO + 4 3), CN resolve Keplerian rotation for both circum-triple...
Abstract We present a statistical characterization of circumstellar disk orientations toward 12 protostellar multiple systems in the Perseus molecular cloud using Atacama Large Millimeter/submillimeter Array at Band 6 (1.3 mm) with resolution ∼25 mas (∼8 au). This exquisite enabled us to resolve compact inner-disk structures surrounding components each system and determine projected 3D orientation disks (position angle inclination) high precision. performed analysis on relative alignment...
We present ALMA band 6/7 (1.3 mm/0.87 mm) and VLA Ka (9 observations toward NGC 2071 IR, an intermediate-mass star forming region. characterize the continuum associated molecular line emission towards most luminous protostars, i.e., IRS1 IRS3, on ~100 au (0. 2") scales. is partly resolved in millimeter centimeter continuum, which shows a potential disk. IRS3 has well disk appearance further into close binary system separated by ~40 at 9 mm. Both sources exhibit clear velocity gradients...
We present a study of ro-vibrational OH and CO emission from 21 disks around Herbig Ae/Be stars. find that the luminosities are proportional over wide range stellar ultraviolet luminosities. The line profiles also similar, indicating they arise roughly same radial region disk. both correlated with far-ultraviolet luminosity stars, while PAH is longer wavelength Although disk flaring affects luminosity, it not factor in emission. These properties consistent models UV-irradiated atmospheres....
We present ALMA (0.87~mm and 1.3~mm) VLA (9~mm) observations toward the candidate intermediate-mass protostar OMC2-FIR3 (HOPS-370; L$_{bol}$~314~L$_{\odot}$) at $\sim$0.1" (40~au) resolution for continuum emission ~0.25" (100 au) of nine molecular lines. The dust observed with 0.87~mm 1.3~mm resolve a near edge-on disk HOPS-370 an apparent radius ~100 au. detect both in free-free extended along jet direction. lines (H$_2$CO, SO, CH$_3$OH, $^{13}$CO, C$^{18}$O, NS, H$^{13}$CN) reveal rotation...
We present a statistical characterization of circumstellar disk orientations toward 12 protostellar multiple systems in the Perseus molecular cloud using Atacama Large Millimeter/submillimeter Array at Band 6 (1.3 mm) with resolution 25 mas (8 au). This exquisite enabled us to resolve compact inner structures surrounding components each system and determine projected 3-D orientation disks (position angle inclination) high precision. performed analysis on relative alignment pairs whether are...