A SPITZER INFRARED SPECTROGRAPH STUDY OF DEBRIS DISKS AROUND PLANET-HOST STARS

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/141/1/11· OSTI ID:21443122

Dodson-Robinson, Sarah E ^[1]; Beichman, C A ^[2]; Carpenter, John M ^[3]; Bryden, Geoffrey ^[4]

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1. Astronomy Department, University of Texas, 1 University Station C1400, Austin, TX 78712 (United States)
2. NASA Exoplanet Science Institute, California Institute of Technology, 770 S. Wilson Ave., Pasadena, CA 91105 (United States)
3. Department of Astronomy, California Institute of Technology, Mail Code 249-17, 1200 E. California Blvd., Pasadena, CA 91105 (United States)
4. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109 (United States)

Since giant planets scatter planetesimals within a few tidal radii of their orbits, the locations of existing planetesimal belts indicate regions where giant planet formation failed in bygone protostellar disks. Infrared observations of circumstellar dust produced by colliding planetesimals are therefore powerful probes of the formation histories of known planets. Here we present new Spitzer infrared spectrograph (IRS) spectrophotometry of 111 solar-type stars, including 105 planet hosts. Our observations reveal 11 debris disks, including two previously undetected debris disks orbiting HD 108874 and HD 130322. Combining the 32 {mu}m spectrophotometry with previously published MIPS photometry, we find that the majority of debris disks around solar-type stars have temperatures in the range 60 {approx}< T{sub dust} {approx}< 100 K. Assuming a dust temperature T{sub dust} = 70 K, which is representative of the nine debris disks detected by both IRS and MIPS, debris rings surrounding Sun-like stars orbit between 15 and 240 AU depending on the mean particle size. Our observations imply that the planets detected by radial-velocity searches formed within 240 AU of their parent stars. If any of the debris disks studied here have mostly large, blackbody emitting grains, their companion giant planets must have formed in a narrow region between the ice line and 15 AU.

• OSTI ID: 21443122
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 141, Issue 1; Other Information: DOI: 10.1088/0004-6256/141/1/11; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
DUSTS
ICE
MATTER
ORBITS
PHOTOMETRY
PLANETS
RADIAL VELOCITY
SATELLITES
SPECTROPHOTOMETRY
SUN
MAIN SEQUENCE STARS
STARS
VELOCITY