Spitzer 24 μm Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars

We present 24 μm Spitzer MIPS photometric observations of the ~50 Myr open cluster IC 2391. Thirty-four cluster members ranging in spectral type from B3 to M5 were observed in the central square degree of the cluster. Excesses indicative of debris disks were discovered around one A star, six FGK stars, and possibly one M dwarf. For the cluster members observed to their photospheric limit, we find a debris disk frequency of 10% for B-A stars and 31% for FGK stars using a 15% relative excess threshold. Relative to a model of decaying excess frequency, the frequency of debris disks around A-type stars appears marginally low for the cluster's age while that of FGK stars appears consistent. Scenarios that may qualitatively explain this result are examined. We conclude that planetesimal activity in the terrestrial region of FGK stars is common in the first ~50 Myr and decays on timescales of ~100 Myr. Despite luminosity differences, debris disk evolution does not appear to depend strongly on stellar mass.

[1]  E. Young,et al.  Spitzer 24 μm Survey of Debris Disks in the Pleiades , 2006, astro-ph/0606039.

[2]  K. H. Kim,et al.  Spitzer IRS Spectroscopy of IRAS-discovered Debris Disks , 2006, astro-ph/0605277.

[3]  D. Fischer,et al.  Metallicity, debris discs and planets , 2006 .

[4]  G. Rieke,et al.  IRS Spectra of Solar-Type Stars: A Search for Asteroid Belt Analogs , 2006, astro-ph/0601468.

[5]  F. Adams,et al.  Early Evolution of Stellar Groups and Clusters: Environmental Effects on Forming Planetary Systems , 2005, astro-ph/0512330.

[6]  D. Padgett,et al.  Formation and Evolution of Planetary Systems (FEPS): Primordial Warm Dust Evolution from 3 to 30 Myr around Sun-like Stars , 2005, astro-ph/0511250.

[7]  S. Wolf,et al.  The Formation and Evolution of Planetary Systems (FEPS): Discovery of an Unusual Debris System Associated with HD 12039 , 2005, astro-ph/0510294.

[8]  D. Kring,et al.  The Origin of Planetary Impactors in the Inner Solar System , 2005, Science.

[9]  G. Rieke,et al.  Frequency of Debris Disks around Solar-Type Stars: First Results from a Spitzer MIPS Survey , 2005, astro-ph/0509199.

[10]  B. Zuckerman,et al.  Extreme collisions between planetesimals as the origin of warm dust around a Sun-like star , 2005, Nature.

[11]  E. Mamajek.  A Moving Cluster Distance to the Exoplanet 2M1207b in the TW Hydrae Association , 2005, astro-ph/0507416.

[12]  E. Young,et al.  Spitzer Space Telescope Observations of G Dwarfs in the Pleiades: Circumstellar Debris Disks at 100 Myr Age , 2005 .

[13]  S. Wolf,et al.  Formation and Evolution of Planetary Systems: Cold Outer Disks Associated with Sun-like Stars , 2005, astro-ph/0506434.

[14]  S. Jacobsen,et al.  THE Hf-W ISOTOPIC SYSTEM AND THE ORIGIN OF THE EARTH AND MOON , 2005 .

[15]  K. Tsiganis,et al.  Origin of the cataclysmic Late Heavy Bombardment period of the terrestrial planets , 2005, Nature.

[16]  G. Rieke,et al.  An Excess Due to Small Grains around the Nearby K0 V Star HD 69830: Asteroid or Cometary Debris? , 2005, astro-ph/0504491.

[17]  S. Kenyon,et al.  Prospects for Detection of Catastrophic Collisions in Debris Disks , 2005, astro-ph/0503551.

[18]  David E. Trilling,et al.  Decay of Planetary Debris Disks , 2005 .

[19]  M. Blaylock,et al.  A Spitzer Study of Dusty Disks in the Scorpius-Centaurus OB Association , 2005, astro-ph/0501103.

[20]  M. Wyatt,et al.  The Insignificance of P-R drag in detectable extrasolar planetesimal belts , 2005, astro-ph/0501038.

[21]  G. Rieke,et al.  Planets and Infrared Excesses: Preliminary Results from a Spitzer MIPS Survey of Solar-Type Stars , 2004, astro-ph/0412265.

[22]  J. Bally,et al.  Can Photoevaporation Trigger Planetesimal Formation? , 2004, astro-ph/0411647.

[23]  Erick T. Young,et al.  Reduction Algorithms for the Multiband Imaging Photometer for Spitzer , 2004, SPIE Astronomical Telescopes + Instrumentation.

[24]  Palermo,et al.  X-ray spectral and timing characteristics of the stars in the young open cluster IC 2391 , 2004, astro-ph/0410099.

[25]  Paul S. Smith,et al.  The Multiband Imaging Photometer for Spitzer (MIPS) , 2004 .

[26]  G. Rieke,et al.  Spitzer Observations of NGC 2547: The Disk Population at 25 Million Years , 2004 .

[27]  B. Elmegreen.  Variability in the stellar initial mass function at low and high mass: three‐component IMF models , 2004, astro-ph/0408231.

[28]  John R. Stauffer,et al.  Spectroscopy of Very Low Mass Stars and Brown Dwarfs in IC 2391: Lithium Depletion and Hα Emission , 2004 .

[29]  S. Wolf,et al.  The Formation and Evolution of Planetary Systems: First Results from a Spitzer Legacy Science Program , 2004, astro-ph/0406301.

[30]  Michael C. Liu,et al.  A Submillimeter Search of Nearby Young Stars for Cold Dust: Discovery of Debris Disks around Two Low-Mass Stars , 2004, astro-ph/0403131.

[31]  G. L. Wycoff,et al.  The Second US Naval Observatory CCD Astrograph Catalog (UCAC2) , 2004, astro-ph/0403060.

[32]  S. Kenyon,et al.  Detecting the Dusty Debris of Terrestrial Planet Formation , 2004, astro-ph/0401343.

[33]  S. Kenyon,et al.  Collisional Cascades in Planetesimal Disks. II. Embedded Planets , 2003, astro-ph/0309540.

[34]  C. Dominik,et al.  Age Dependence of the Vega Phenomenon: Theory , 2003, astro-ph/0308364.

[35]  Amsterdam,et al.  The age dependence of the Vega phenomenon: Observations , 2003, astro-ph/0308294.

[36]  Wm. A. Wheaton,et al.  2MASS All Sky Catalog of point sources. , 2003 .

[37]  I. Matsuyama,et al.  Halting Planet Migration by Photoevaporation from the Central Source , 2003, astro-ph/0302042.

[38]  I. Reid,et al.  Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope Wide Field Planetary Camera 2 , 2002, astro-ph/0211470.

[39]  J. Munn,et al.  The USNO-B Catalog , 2002, astro-ph/0210694.

[40]  K. Mezger,et al.  Rapid accretion and early core formation on asteroids and the terrestrial planets from Hf–W chronometry , 2002, Nature.

[41]  B. Zuckerman,et al.  M-Type Vega-like Stars , 2002, astro-ph/0204255.

[42]  B. Zuckerman.  Dusty Circumstellar Disks , 2001 .

[43]  J. Chambers.  Making More Terrestrial Planets , 2001 .

[44]  R. Cutri,et al.  Extinction with 2MASS: Star Counts and Reddening toward the North America and Pelican Nebulae , 2001, astro-ph/0201373.

[45]  Elizabeth A. Lada,et al.  Disk Frequencies and Lifetimes in Young Clusters , 2001, astro-ph/0104347.

[46]  S. Randich,et al.  Membership, lithium, and metallicity in the young open clusters IC 2602 and IC 2391: Enlarging the sample ?;?? , 2001, astro-ph/0103260.

[47]  B. Zuckerman,et al.  Dusty Debris around Solar-Type Stars: Temporal Disk Evolution , 2001, astro-ph/0103185.

[48]  J. Carpenter.  Color Transformations for the 2MASS Second Incremental Data Release , 2001, astro-ph/0101463.

[49]  N. Hambly,et al.  Very Low-Mass Stars and Brown Dwarfs of the Young Open Cluster IC 2391 , 2000, astro-ph/0011492.

[50]  R. Laureijs,et al.  Incidence and survival of remnant disks around main-sequence stars , 2000, astro-ph/0011137.

[51]  B. Patten,et al.  A Photometric Survey for Low‐Mass Members of IC 2391 , 1999 .

[52]  J. Bally,et al.  Photoevaporation of Disks and Clumps by Nearby Massive Stars: Application to Disk Destruction in the Orion Nebula , 1998 .

[53]  T. Simon,et al.  A Deep X‐Ray Image of IC 2391 , 1998 .

[54]  M. Giampapa,et al.  Rotational Velocities and Chromospheric/Coronal Activity of Low-Mass Stars in the Young Open Clusters IC 2391 and IC 2602 , 1997 .

[55]  B. Patten,et al.  The Evolution of Rotation and Activity in Young Open Clusters: IC 2391 , 1996 .

[56]  P. R. Bevington,et al.  Data Reduction and Error Analysis for the Physical Sciences, 2nd ed. , 1993 .

[57]  B. Patten,et al.  THE EVOLUTION OF STELLAR CORONAE: INITIAL RESULTS FROM A ROSAT PSPC OBSERVATION OF IC 2391 , 1993 .

[58]  L. Hartmann,et al.  Pre--Main-Sequence Stars in the Young Cluster IC 2391 , 1989 .

[59]  R. Sagar,et al.  Internal kinematics of open star clusters , 1989 .

[60]  A. Chokshi,et al.  IR excesses in Be stars , 1987 .

[61]  D. Sullivan,et al.  Seven-color photoelectric photometry of the Omicron Velorum cluster , 2001 .

[62]  J. Heidmann,et al.  Bioastronomy The Search for Extraterrestial Life — The Exploration Broadens , 1991 .