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Title:
Decay of Planetary Debris Disks
Authors:
Rieke, G. H.; Su, K. Y. L.; Stansberry, J. A.; Trilling, D.; Bryden, G.; Muzerolle, J.; White, B.; Gorlova, N.; Young, E. T.; Beichman, C. A.; Stapelfeldt, K. R.; Hines, D. C.
Affiliation:
AA(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AB(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AC(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AD(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AE(Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109.), AF(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AG(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AH(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AI(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AJ(Michelson Science Center, JPL, 4800 Oak Grove Drive, Pasadena, CA 91109.), AK(Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109.), AL(Steward Observatory. Currently at Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301.)
Publication:
The Astrophysical Journal, Volume 620, Issue 2, pp. 1010-1026. (ApJ Homepage)
Publication Date:
02/2005
Origin:
UCP
ApJ Keywords:
Stars: Circumstellar Matter, Infrared: Stars, Stars: Planetary Systems: Formation
DOI:
10.1086/426937
Bibliographic Code:
2005ApJ...620.1010R

Abstract

We report new Spitzer 24 μm photometry of 76 main-sequence A-type stars. We combine these results with previously reported Spitzer 24 μm data and 24 and 25 μm photometry from the Infrared Space Observatory and the Infrared Astronomy Satellite. The result is a sample of 266 stars with mass close to 2.5 Msolar, all detected to at least the ~7 σ level relative to their photospheric emission. We culled ages for the entire sample from the literature and/or estimated them using the H-R diagram and isochrones; they range from 5 to 850 Myr. We identified excess thermal emission using an internally derived K-24 (or 25) μm photospheric color and then compared all stars in the sample to that color. Because we have excluded stars with strong emission lines or extended emission (associated with nearby interstellar gas), these excesses are likely to be generated by debris disks. Younger stars in the sample exhibit excess thermal emission more frequently and with higher fractional excess than do the older stars. However, as many as 50% of the younger stars do not show excess emission. The decline in the magnitude of excess emission, for those stars that show it, has a roughly t0/time dependence, with t0~150 Myr. If anything, stars in binary systems (including Algol-type stars) and λ Boo stars show less excess emission than the other members of the sample. Our results indicate that (1) there is substantial variety among debris disks, including that a significant number of stars emerge from the protoplanetary stage of evolution with little remaining disk in the 10-60 AU region and (2) in addition, it is likely that much of the dust we detect is generated episodically by collisions of large planetesimals during the planet accretion end game, and that individual events often dominate the radiometric properties of a debris system. This latter behavior agrees generally with what we know about the evolution of the solar system, and also with theoretical models of planetary system formation.
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