Paper: astro-ph/0511250
Date: Wed, 9 Nov 2005 00:30:14 GMT (346kb)
Title: Formation and Evolution of Planetary Systems (FEPS): Primordial Warm
Dust Evolution From 3-30 Myr around Sun-like Stars
Authors: M.D. Silverstone (1), M.R. Meyer (1), E.E. Mamajek (2), D.C. Hines
(3), L.A. Hillenbrand (4), J. Najita (5), I. Pascucci (1), J. Bouwman (6),
J.S. Kim (1), J.M. Carpenter (4), J.R. Stauffer (7), D.E. Backman (8) A.
Moro-Martin (9), T. Henning (6), S. Wolf (6), T.Y. Brooke (7), D.L. Padgett
(7) ((1) Steward Obs., U. of AZ, (2) Harvard-Smithsonian CfA (3) Space
Science Institute, (4) Dept. of Astron., CalTech, (5) NOAO, (6)
Max-Plank-Institut fur Astronomie, (7) Spitzer Science Cntr., (8) NASA-Ames
Research Cntr., (9) Dept. of Astrophys. Sci., Princeton U.)
Comments: 16 pages, includes 2 figures and 2 tables
\\
We present data obtained with the Infrared Array Camera (IRAC) aboard the
Spitzer Space Telescope (Spitzer) for a sample of 74 young (t < 30 Myr old)
Sun-like (0.7 < M(star)/M(Sun) < 1.5) stars. These are a sub-set of the
observations that comprise the Spitzer Legacy science program entitled the
Formation and Evolution of Planetary Systems (FEPS). Using IRAC we study the
fraction of young stars that exhibit 3.6-8.0 micron infrared emission in excess
of that expected from the stellar photosphere, as a function of age from 3-30
Myr. The most straightforward interpretation of such excess emission is the
presence of hot (300-1000K) dust in the inner regions (< 3 AU) of a
circumstellar disk. Five out of the 74 young stars show a strong infrared
excess, four of which have estimated ages of 3-10 Myr. While we detect excesses
from 5 optically thick disks, and photospheric emission from the remainder of
our sample, we do not detect any excess emission from optically thin disks at
these wavelengths. We compare our results with accretion disk fractions
detected in previous studies, and use the ensemble results to place additional
constraints on the dissipation timescales for optically-thick, primordial
disks.
\\ ( http://arXiv.org/abs/astro-ph/0511250 , 346kb)
Space/Science » in reply to First optical images of circumstellar dust surrounding the debris disk candidate HD 32297
Formation and Evolution of Planetary Systems (FEPS): Primordial Warm Dust Evolution From 3-30 Myr around Sun-like Stars
The whole thread (18 posts)
- The Origin and Nature of Neptune-like Planets Orbiting Close to Solar Type Stars
- Binary stars are rather common
- On the width and shape of gaps in protoplanetary disks
- Observational Constraints on Dust Disk Lifetimes: Implications for Planet Formation
- Photometric searches for transiting planets: results and challenges
- Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-Mass Dwarf Stars II. Sulfur and Phosphorus
- Ultra low-mass star and substellar formation in sigma Orionis
- Polarization of Starlight by Unresolved and Oblate Extra-solar Planet in Elliptical Orbit
- Dust in Resonant Extrasolar Kuiper Belts - Grain Size and Wavelength Dependence of Disk Structure
- Polarization of Starlight by Unresolved and Oblate Extra-solar Planet in Elliptical Orbit
- Ultra low-mass star and substellar formation in sigma Orionis
- Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-Mass Dwarf Stars II. Sulfur and Phosphorus
- Photometric searches for transiting planets: results and challenges
- Observational Constraints on Dust Disk Lifetimes: Implications for Planet Formation