Browsing Faculty of Arts and Sciences by Keyword "circumstellar matter"
Now showing items 1-7 of 7
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Complex Organic Molecules During Low-Mass Star Formation: Pilot Survey Results
(IOP Publishing, 2014)Complex organic molecules (COMs) are known to be abundant toward some low-mass young stellar objects (YSOs), but how these detections relate to typical COM abundance are not yet understood. We aim to constrain the frequency ... -
The Dual-Axis Circumstellar Environment of the Type IIn Supernova 1997eg
(Institute of Physics, 2008)We present multi-epoch spectral and spectropolarimetric observations of the Type IIn supernova (SN) 1997eg that indicate the presence of a flattened disk-like concentration of circumstellar material surrounding nonspherical ... -
Pan-STARRS1 Discovery of Two Ultraluminous Supernovae at z ≈ 0.9
(IOP Publishing, 2011)We present the discovery of two ultraluminous supernovae (SNe) at z ≈ 0.9 with the Pan-STARRS1 Medium Deep Survey. These SNe, PS1-10ky and PS1-10awh, are among the most luminous SNe ever discovered, comparable to the unusual ... -
Relating jet structure to photometric variability: the Herbig Ae star HD 163296
(EDP Sciences, 2014)Herbig Ae/Be stars are intermediate-mass pre-main sequence stars surrounded by circumstellar dust disks. Some are observed to produce jets, whose appearance as a sequence of shock fronts (knots) suggests a past episodic ... -
The Spatial Distribution of Organics Toward the High-mass YSO NGC 7538 IRS9
(IOP Publishing, 2013)Complex molecules have been broadly classified into three generations dependent on the mode of formation and the required formation temperature (<25, 25-100 K, and >100 K). Around massive young stellar objects (MYSOs), icy ... -
Submillimeter Array Imaging of the Maser Emission from the \(H30\alpha\) Radio Recombination Line in MWC 349A
(American Astronomical Society, 2008)We used the Submillimeter Array to map the angular distribution of the H30α recombination line (231.9 GHz) in the circumstellar region of the peculiar star MWC 349A. The resolution was 1.2'', but because of high signal-to-noise ... -
The V1647 Orionis (IRAS 05436–0007) Protostar and Its Environment
(IOP Publishing, 2004)We present Sloan Digital Sky Survey (SDSS) and United States Naval Observatory (USNO) observations of the V1647 Ori protostar and its surrounding field near NGC 2068. V1647 Ori, the likely driving source for HH 23, brightened ...