7.7k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Space Telescope Science InstituteUS138 papers
- University of ArizonaUS124 papers
- California Institute of TechnologyUS119 papers
- Center for Astrophysics Harvard & SmithsonianUS102 papers
- Centre National de la Recherche ScientifiqueFR86 papers
- University of California, BerkeleyUS71 papers
- University of MichiganUS64 papers
- Oak Ridge National LaboratoryUS62 papers
- University of FloridaUS62 papers
- Jet Propulsion LaboratoryUS61 papers
- University of California, DavisUS61 papers
- University of Illinois Urbana-ChampaignUS61 papers
96 papers · 1 filter
Toward understanding the 3.4 micron and 9.7 micron extinction feature variations from the local diffuse interstellar medium to the Galactic center
Jian Gao, B. W. Jiang, Aigen Li
Observationally, both the 3.4micron aliphatic hydrocarbon C--H stretching absorption feature and the 9.7micron amorphous silicate Si--O stretching absorption feature show considera…
The 21 micron and 30 micron circumstellar dust features in evolved C-rich objects
B. W. Jiang, Ke Zhang, Aigen Li
The 21micron and 30micron bands are the strongest dust emission features detected in evolved low- and intermediate-mass C-rich stars (i.e. asymptotic giant branch [AGB] stars, prot…
Dust Processing and Grain Growth in Protoplanetary Disks in the Taurus-Auriga Star-Forming Region
B. A. Sargent, W. J. Forrest, C. Tayrien +9
Mid-infrared spectra of 65 T Tauri stars (TTS) taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope are modeled using dust at two temperatures to probe t…
Silica in Protoplanetary Disks
B. A. Sargent, W. J. Forrest, C. Tayrien +10
Mid-infrared spectra of a few T Tauri stars (TTS) taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope show prominent narrow emission features indicating…
The Dust-to-Gas Ratio in the Small Magellanic Cloud Tail
K. D. Gordon, C. Bot, E. Muller +21
The Tail region of the Small Magellanic Cloud (SMC) was imaged using the MIPS instrument on the Spitzer Space Telescope as part of the SAGE-SMC Spitzer Legacy. Diffuse infrared emi…
Probing Cosmic Dust of the Early Universe through High-Redshift Gamma-Ray Bursts
S. L. Liang, Aigen Li
We explore the extinction properties of the dust in the distant universe through the afterglows of high-redshifted GRBs based on the "Drude" model which, unlike previous studies, d…
Silicon carbide absorption features: dust formation in the outflows of extreme carbon stars
Angela K. Speck, Adrian B. Corman, Kristina Wakeman +2
Infrared carbon stars without visible counterparts are generally known as extreme carbon stars. We have selected a subset of these stars with absorption features in the 10-13 m…
Discovery of Extreme Carbon Stars in the Large Magellanic Cloud
R. A. Gruendl, Y. -H. Chu, J. P. Seale +4
Using Spitzer IRAC and MIPS observations of the Large Magellanic Cloud, we have identified 13 objects that have extremely red mid-IR colors. Follow-up Spitzer IRS observations of s…
The Cosmic Crystallinity Conundrum: Clues from IRAS 17495-2534
Angela K. Speck, Alan G. Whittington, Josh B. Tartar
Since their discovery, cosmic crystalline silicates have presented several challenges to understanding dust formation and evolution. The mid-infrared spectrum of IRAS 174952534,…
PAH emission from Herbig AeBe stars
Luke D. Keller, G. C. Sloan, W. J. Forrest +10
We present spectra of a sample of Herbig Ae and Be (HAeBe) stars obtained with the Infrared Spectrograph on the Spitzer Space Telescope. All but one of the Herbig stars show emissi…
PAHs in Comets: An Overview
Aigen Li
Polycyclic aromatic hydrocarbon (PAH) molecules, ubiquitously seen in the interstellar medium (ISM) of our own and external galaxies, might have been incorporated into comets if th…
On the Crystallinity of Silicate Dust in the Interstellar Medium
M. P. Li, G. Zhao, Aigen Li
An accurate knowledge of the mineralogy (chemical composition and crystal structure) of the silicate dust in the interstellar medium (ISM) is crucial for understanding its origin i…
On Buckyonions as an Interstellar Grain Component
Aigen Li, J. H. Chen, M. P. Li +2
The carrier of the 2175 Angstrom interstellar extinction feature remains unidentified since its first detection over 40 years ago. In recent years carbon buckyonions have been prop…
On the Anomalous Silicate Emission Features of AGNs: A Possible Interpretation Based on Porous Dust
M. P. Li, Q. J. Shi, Aigen Li
The recent Spitzer detections of the 9.7 micron Si--O silicate emission in type 1 AGNs provide support for the AGN unification scheme. The properties of the silicate dust are of ke…
On Dust Extinction of Gamma-ray Burst Host Galaxies
Aigen Li, S. L. Liang, D. A. Kann +3
Although it is well recognized that gamma-ray burst (GRB) afterglows are obscured and reddened by dust in their host galaxies, the wavelength-dependence and quantity of dust extinc…
Complex Organic Materials in the HR 4796A Disk?
M. Koehler, I. Mann, Aigen Li
The red spectral shape of the visible to near infrared reflectance spectrum of the sharply-edged ring-like disk around the young main sequence star HR 4796A was recently interprete…
Time-Resolved AU-Scale Jets Traced by Masers in the IRAS 4A/B Regions of NGC1333
Kevin B. Marvel, Bruce A. Wilking, Mark J Claussen +1
We present results of VLBI observations of the water masers associated with IRAS 4A and IRAS 4B in the NGC 1333 star-forming region taken in four epochs over a two month period. Bo…
The relations among 8, 24, and 160 micron dust emission within nearby spiral galaxies
G. J. Bendo, B. T. Draine, C. W. Engelbracht +9
We investigate the relations among the stellar continuum-subtracted 8 micron polycyclic aromatic hydrocarbon (PAH 8 micron) emission, 24 micron hot dust emission, and 160 micron co…
Optical properties of silicon carbide for astrophysical applications I. New laboratory infrared reflectance spectra and optical constants
K. M. Pitman, A. M. Hofmeister, A. B. Corman +1
Silicon Carbide (SiC) optical constants are fundamental inputs for radiative transfer models of astrophysical dust environments. However, previously published values contain errors…
Astrodynamical Space Test of Relativity using Optical Devices I (ASTROD I) - A class-M fundamental physics mission proposal for Cosmic Vision 2015-2025
Thierry Appourchaux, Raymond Burston, Yanbei Chen +33
ASTROD I is a planned interplanetary space mission with multiple goals. The primary aims are: to test General Relativity with an improvement in sensitivity of over 3 orders of magn…
Determining the Dust Extinction of Gamma-ray Burst Host Galaxies: A Direct Method Based on Optical and X-ray Photometry
Yuan Li, Aigen Li, Daming Wei
The dust extinction of gamma-ray bursts (GRBs) host galaxies, containing important clues to the nature of GRB progenitors and crucial for dereddening, is still poorly known. Here w…
VLT / Infrared Integral Field Spectrometer Observations of Molecular Hydrogen Lines in the Knots in the Planetary Nebula NGC 7293 (the Helix Nebula)
M. Matsuura, A. K. Speck, M. D. Smith +6
Knots are commonly found in nearby planetary nebulae (PNe) and star forming regions. Within PNe, knots are often found to be associated with the brightest parts of the nebulae and…
Decaying Dark Energy in Higher-Dimensional Gravity
J. M. Overduin, P. S. Wesson, B. Mashhoon
We use data from observational cosmology to put constraints on higher-dimensional extensions of general relativity in which the effective four-dimensional dark-energy density (or c…
Variations in 24 micron morphologies among galaxies in the Spitzer Infrared Nearby Galaxies Survey: New insights into the Hubble sequence
G. J. Bendo, D. Calzetti, C. W. Engelbracht +7
To study the distribution of star formation and dust emission within nearby galaxies, we measured five morphological parameters in the 3.6 and 24 micron wave bands for 65 galaxies…