571 results on '"Hines, Dean C."'
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202. Formation and Evolution of Planetary Systems: Cold Outer Disks Associated with Sun‐like Stars
203. Exploring Terrestrial Planet Formation in the TW Hydrae Association
204. An Infrared Coronagraphic Survey for Substellar Companions
205. Spitzer Space TelescopeObservations of G Dwarfs in the Pleiades: Circumstellar Debris Disks at 100 Myr Age
206. Discovery of a Nearly Edge-on Disk around HD 32297
207. Reduction algorithms for the multiband imaging photometer for Spitzer: 6 months of flight data
208. On-orbit performance of the MIPS instrument
209. New Debris‐Disk Candidates: 24 Micron Stellar Excesses at 100 Million years
210. Optical Spectropolarimetry of Quasi‐stellar Objects Discovered by the Two‐Micron All Sky Survey
211. AHubble Space TelescopeWFPC2 Snapshot Survey of 2MASS‐selected Red QSOs
212. An Extraordinary Scattered Broad Emission Line in a Type 2 Quasi-stellar Object
213. The Nascent Bipolar Nebula Surrounding the Carbon‐rich Variable CIT 6: Transition to Axisymmetry
214. Hubble Space TelescopeNICMOS Observations of the Polarization of NGC 1068
215. The Optical Polarization of Near‐Infrared–selected Quasi‐Stellar Objects
216. The X-Ray Properties of 2MASS Red Active Galactic Nuclei
217. The state of the focus and image quality of the Spitzer Space Telescope as measured in orbit.
218. Reduction algorithms for the multiband imaging photometer for Spitzer: 6 months of flight data.
219. Hubble Space TelescopeUltraviolet and Ground‐based Optical Spectropolarimetry ofIRASQuasi‐stellar Objects: Dusty Scattering in Luminous Active Galactic Nuclei
220. Small-grid dithers for the JWST coronagraphs
221. Two Highly Polarized Quasi-stellar Objects Discovered by the Two Micron All Sky Survey
222. A Candidate Substellar Companion to HR 7329
223. Pinpointing the Position of the Post–Asymptotic Giant Branch Star at the Core of RAFGL 2688 Using Polarimetric Imaging with NICMOS
224. NICMOS Observations of the Pre–Main-Sequence Planetary Debris System HD 98800
225. The Polarized Spectrum of APM 08279+5255
226. NICMOS Imaging of the HR 4796A Circumstellar Disk
227. A Candidate Substellar Companion to CD −33°7795 (TWA 5)
228. The Polarization of Broad Absorption Line QSOs
229. The Misdirected Central Engine of the Hyperluminous Infrared Galaxy and Type 2 QSO IRAS P09104+4109
230. The Host Galaxy of the Broad Absorption Line QSO PG 1700+518 and Its Ring Galaxy Companion: NICMOS 1.6 Micron Imaging
231. The Structure of the Prototype Bipolar Protoplanetary Nebula CRL 2688 (Egg Nebula): Broadband, Polarimetric, and H[TINF]2[/TINF] Line Imaging with NICMOS on the [ITAL]Hubble Space Telescope[/ITAL]
232. Initial On-Orbit Performance of NICMOS
233. Hubble Space Telescopeand Ground‐based Observations of I Zw 1 and MRK 486 and the Variability of Polarization in Radio‐quiet Active Galactic Nuclei
234. The Buried QSO in IRAS F15307+3252 and the Nature of Hyperluminous Infrared Galaxies
235. The Polarized Spectrum of the Fe [CSC]ii[/CSC]–Rich Broad Absorption Line QSO IRAS 07598+6508
236. MID-INFRARED SPECTRAL PROPERTIES OF POST-STARBURST QUASARS.
237. Spectropolarimetry of SN 1993J in NGC 3031
238. The Highly Polarized Hidden Quasar IRAS 09104+4109: A Double-lobed Radio Source in a Rich Cluster
239. Broad Paschen-alpha emission in two extremely infrared luminous Seyfert 2 galaxies
240. Probing the Evolution of Infrared Properties of z ∼ 6 Quasars: Spitzer Observations.
241. Hubble Space Telescope NICMOS Observations of the Polarization of NGC 1068Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with GTO proposal 7212, PI: E. F. Erickson.
242. Small-grid dithering strategy for improved coronagraphic performance with JWST
243. Simulations of JWST MIRI 4QPM coronagraphs operations and performances
244. A JWST MIRI MRS View of the η Tel Debris Disk and Its Brown Dwarf Companion.
245. The polarimetric nature of HD 108.
246. Hubble Space Telescope and Ground-based Observations of I Zw 1 and Mrk 486 and the Variability of Polarization in Radio-quiet Active Galactic Nuclei.
247. THE STRUCTURE OF THE ? LEONIS DEBRIS DISK
248. HUBBLE SPACE TELESCOPE NICMOS POLARIZATION OBSERVATIONS OF THREE EDGE-ON MASSIVE YOUNG STELLAR OBJECTS
249. The Complete Census of 70 ?m-Bright Debris Disks within "The Formation and Evolution of Planetary Systems" Spitzer Legacy Survey of Sun-like Stars
- Abstract
We report detection of cool dust surrounding solar-type stars from observations performed as part of the Spitzer Legacy Science Program FEPS. From a sample of 328 stars having ages ~0.003-3 Gyr we have selected sources with 70 mm flux densities indicating excess in their SEDs above expected photospheric emission. Six strong excess sources are likely primordial circumstellar disks, remnants of the star formation process. Another 25 sources having [?]3 s excesses are associated with dusty debris disks, generated by collisions within planetesimal belts that are possibly stirred by existing planets. Six additional sources with [?]2 s excesses require confirmation as debris disks. In our analysis, most (>80%) 70 mm excess sources have [?]3 s excesses at 33 mm as well, while only a minority (<40%) have [?]3 s excesses at 24 mm. The rising SEDs toward (and perhaps beyond) 70 mm imply dust temperatures
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< 45-85 K for debris in equilibrium with the stellar radiation field. From fitted single-temperature blackbody models we infer bulk dust properties such as characteristic temperature, location, fractional luminosity, and mass. For >\frac{1}{3} $&frac;{1}{3}$ of the debris sources we find that multiple temperature components are suggested, implying a dust distribution extending over many tens of AU. Because the disks are dominated by collisional processes, the parent body (planetesimal) belts may be extended as well. Preliminary assessment of the statistics of cold debris around Sun-like stars shows that ~10% of FEPS targets with masses between 0.6 and 1.8 M and ages between 30 Myr and 3 Gyr exhibit excess 70 mm emission. We find that fractional excess amplitudes appear higher for younger stars and that there may be a trend in 70 mm excess frequency with stellar mass.
250. Young Stars and Dust in AFGL 437: Hubble Space Telescope NICMOS Polarimetric Imaging of an Outflow Source
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