NEW DEBRIS DISKS AROUND YOUNG, LOW-MASS STARS DISCOVERED WITH THE SPITZER SPACE TELESCOPE

We present 24 μm and 70 μm Multiband Imaging Photometer for Spitzer (MIPS) observations of 70 A through M-type dwarfs with estimated ages from 8 Myr to 1.1 Gyr, as part of a Spitzer guaranteed time program, including a re-analysis of some previously published source photometry. Our sample is selected from stars with common youth indicators such as lithium abundance, X-ray activity, chromospheric activity, and rapid rotation. We compare our MIPS observations to empirically derived K_s -[24] colors as a function of the stellar effective temperature to identify 24 μm and 70 μm excesses. We place constraints or upper limits on dust temperatures and fractional infrared luminosities with a simple blackbody dust model. We confirm the previously published 70 μm excesses for HD 92945, HD 112429, and AU Mic, and provide updated flux density measurements for these sources. We present the discovery of 70 μm excesses for five stars: HD 7590, HD 10008, HD 59967, HD 73350, and HD 135599. HD 135599 is also a known Spitzer IRS (InfraRed Spectrograph) excess source, and we confirm the excess at 24 μm. We also present the detection of 24 μm excesses for 10 stars: HD 10008, GJ 3400A, HD 73350, HD 112429, HD 123998, HD 175742, AT Mic, BO Mic, HD 358623 and Gl 907.1. We find that large 70 μm excesses are less common around stars with effective temperatures of less than 5000 K (3.7^(+7.6)_(–1.1)%) than around stars with effective temperatures between 5000 K and 6000 K (21.4^(+9.5)_(–5.7)%), despite the cooler stars having a younger median age in our sample (12 Myr vs. 340 Myr). We find that the previously reported excess for TWA 13A at 70 μm is due to a nearby background galaxy, and the previously reported excess for HD 177724 is due to saturation of the near-infrared photometry used to predict the mid-infrared stellar flux contribution. In the Appendix, we present an updated analysis of dust grain removal timescales due to grain-grain collisions and radiation pressure, Poynting-Robertson (P-R) drag, stellar wind drag, and planet-dust dynamical interaction. We find that drag forces can be important for disk dynamics relative to grain-grain collisions for L_(IR)/L_* < 10^(–4), and that stellar wind drag is more important than P-R drag for K and M dwarfs, and possibly for young (<1 Gyr) G dwarfs as well.

[1]  C. A. O. Torres,et al.  Search for associations containing young stars (SACY). I. Sample and searching method , 2006 .

[2]  P. Plavchan,et al.  Where Are the M Dwarf Disks Older Than 10 Million Years , 2005, astro-ph/0506132.

[3]  M. Meyer,et al.  Intrinsic near-infrared excesses of T tauri stars: Understanding the classical T tauri star locus , 1997 .

[4]  M. Wyatt,et al.  Evolution of Debris Disks , 2008 .

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

[6]  K. Y. L. Su,et al.  Steady State Evolution of Debris Disks around A Stars , 2007 .

[7]  Michael S. Bessell,et al.  The β Pictoris Moving Group , 2001 .

[8]  James R. Graham,et al.  The AU Microscopii Debris Disk: Multiwavelength Imaging and Modeling , 2007, 0705.4196.

[9]  Sallie L. Baliunas,et al.  A Survey of CA II H and K Chromospheric Emission in Southern Solar-Type Stars , 1996 .

[10]  K. Stapelfeldt,et al.  EPSILON ERIDANI'S PLANETARY DEBRIS DISK: STRUCTURE AND DYNAMICS BASED ON SPITZER AND CALTECH SUBMILLIMETER OBSERVATORY OBSERVATIONS , 2008, 0810.4564.

[11]  Friedrich-Schiller-Universitat Jena,et al.  On the nature of clumps in debris disks , 2006, astro-ph/0610871.

[12]  J. Augereau,et al.  Spitzer Observations of the Hyades: Circumstellar Debris Disks at 625 Myr of Age , 2008, 0801.4403.

[13]  K. Rice,et al.  Protostars and Planets V , 2005 .

[14]  G. Rieke,et al.  Far-Infrared Properties of M Dwarfs , 2007, 0707.0464.

[15]  Wm. A. Wheaton,et al.  Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer. II. 70 μm Imaging , 2007, 0704.2196.

[16]  Ucla,et al.  Exploring Terrestrial Planet Formation in the TW Hydrae Association , 2005, astro-ph/0506291.

[17]  K. Stapelfeldt,et al.  Spitzer MIPS Observations of Stars in the β Pictoris Moving Group , 2008, 0803.1674.

[18]  Michel Mayor,et al.  Stellar Kinematic Groups. I. The URSA Major Group , 1993 .

[19]  F. J. Low,et al.  DISCOVERY OF A SHELL AROUND ALPHA-LYRAE , 1984 .

[20]  G. González.  The stellar metallicity—giant planet connection , 1997 .

[21]  Paul S. Smith,et al.  To appear in The Astrophysical Journal Letters Preprint typeset using L ATEX style emulateapj v. 6/22/04 SPITZER FAR-INFRARED DETECTIONS OF COLD CIRCUMSTELLAR DISKS , 2006 .

[22]  D. Kilkenny,et al.  UBV(RI)C photometry of Hipparcos red stars , 2002 .

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

[24]  E. Wright,et al.  The Spitzer Space Telescope Mission , 2004, astro-ph/0406223.

[25]  L. Hillenbrand,et al.  Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics , 2008, 0807.1686.

[26]  Adaptive Optics Imaging of the AU Microscopii Circumstellar Disk: Evidence for Dynamical Evolution , 2004, astro-ph/0412143.

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

[28]  Immo Appenzeller,et al.  Star-disk interaction in young stars : proceedings of the 243th symposium of the International Astronomical Union held in Grenoble, France, May 21-25, 2007 , 2007 .

[29]  A. Cox,et al.  Allen's astrophysical quantities , 2000 .

[30]  R. Cutri,et al.  Discovery of New Candidate Vega-type Systems from IRAS and the 2 Micron All-Sky Survey , 2000 .

[31]  S. E. Dahm,et al.  Spitzer Observations of NGC 2362: Primordial Disks at 5 Myr , 2007 .

[32]  J. Chambers.  Planetary accretion in the inner Solar System , 2004 .

[33]  Brenda C. Matthews,et al.  Discovery of a Large Dust Disk Around the Nearby Star AU Microscopii , 2004, Science.

[34]  The Inner Rings of β Pictoris , 2002, astro-ph/0212081.

[35]  A. Quillen,et al.  Planetary embryos and planetesimals residing in thin debris discs , 2007, 0705.1325.

[36]  Mark Clampin,et al.  Optical Images of an Exosolar Planet 25 Light-Years from Earth , 2008, Science.

[37]  J. Kirkpatrick,et al.  Keck Spectra of Pleiades Brown Dwarf Candidates and a Precise Determination of the Lithium Depletion Edge in the Pleiades , 1998, astro-ph/9804005.

[38]  D. Montes,et al.  Late-type members of young stellar kinematic groups – I. Single stars , 2001, astro-ph/0106537.

[39]  Two Additions to the New Class of Low Accretion Rate Magnetic Binaries , 2006, astro-ph/0610818.

[40]  D. F. Gray,et al.  The Observation and Analysis of Stellar Photospheres , 2021 .

[41]  L. Cieza,et al.  Testing the Disk Regulation Paradigm with Spitzer Observations. II. A Clear Signature of Star-Disk Interaction in NGC 2264 and the Orion Nebula Cluster , 2007, 0707.4509.

[42]  G. Rieke,et al.  Debris Disks in NGC 2547 , 2007, 0707.2827.

[43]  B. Zuckerman,et al.  M-TYPE VEGA-LIKE STARS , 2002, astro-ph/0204255.

[44]  New Mass-Loss Measurements from Astrospheric Lyα Absorption , 2005, astro-ph/0506401.

[45]  Ucla,et al.  A SEARCH FOR WARM CIRCUMSTELLAR DISKS IN THE TW HYDRAE ASSOCIATION , 2004, astro-ph/0401318.

[46]  L. Eyer,et al.  New periodic variables from the Hipparcos epoch photometry , 2002 .

[47]  Robert Pina,et al.  A dust disk surrounding the young A star HR4796A , 1998 .

[48]  R. O. Gray,et al.  Debris Disks in Main-Sequence Binary Systems , 2006, astro-ph/0612029.

[49]  The Origin of Planetary Impactors in the Inner Solar System , 2005, Science.

[50]  D. Frail,et al.  A planetary system around the millisecond pulsar PSR1257 + 12 , 1992, Nature.

[51]  E. L. Wright,et al.  Observational confirmation of a circumsolar dust ring by the COBE satellite , 1995, Nature.

[52]  R. Stencel,et al.  Far-infrared properties of flare stars and dM stars , 1989 .

[53]  K. Stapelfeldt,et al.  A Spitzer Study of Dusty Disks around Nearby, Young Stars , 2005 .

[54]  C. Chiappini,et al.  K dwarfs and the chemical evolution of the Solar cylinder , 2002, astro-ph/0206446.

[55]  I. Romanyuk,et al.  Spatial Distribution of Magnetic CP Stars , 2003 .

[56]  M. C. Wyatt,et al.  RESONANT TRAPPING OF PLANETESIMALS BY PLANET MIGRATION: DEBRIS DISK CLUMPS AND VEGA'S SIMILARITY TO THE SOLAR SYSTEM , 2003 .

[57]  D. B. Navascués.  On the age of the TW Hydrae association and 2M1207334-393254 , 2006, astro-ph/0608478.

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

[59]  S. Hawley,et al.  The Palomar/MSU Nearby Star Spectroscopic Survey.II.The Southern M Dwarfs and Investigation of Magnetic Activity , 1996 .

[60]  Michael W. Richmond,et al.  TASS Mark IV Photometric Survey of the Northern Sky , 2006 .

[61]  M. Köhler,et al.  Momentum transfer to fluffy dust aggregates from stellar winds , 2006 .

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

[63]  R. Laureijs,et al.  A 25 micron search for Vega-like disks around main-sequence stars with ISO , 2002 .

[64]  David R. Alexander,et al.  The NEXTGEN Model Atmosphere Grid. II. Spherically Symmetric Model Atmospheres for Giant Stars with Effective Temperatures between 3000 and 6800 K , 1999, astro-ph/9907194.

[65]  B. Macintosh,et al.  Direct Imaging of Multiple Planets Orbiting the Star HR 8799 , 2008, Science.

[66]  Russel J. White,et al.  The fate of the solid matter orbiting HR 4796A , 1995 .

[67]  Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I. , 2003, astro-ph/0308182.

[68]  J. Debes,et al.  Measuring M Dwarf Winds with DAZ White Dwarfs , 2006, astro-ph/0608030.

[69]  E. Young,et al.  Spitzer Space Telescope Observations of G Dwarfs in the Pleiades: Circumstellar Debris Disks at 100 Myr Age , 2005, astro-ph/0506743.

[70]  D. Padgett,et al.  Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer. I. The Stellar Calibrator Sample and the 24 μm Calibration , 2007, 0704.2195.

[71]  A. K. Vivas,et al.  Spitzer Observations of the Orion OB1 Association: Disk Census in the Low-Mass Stars , 2007, 0709.0912.

[72]  N. Pizzolato,et al.  Dependence of coronal X-ray emission on spot-induced brightness variations in cool main sequence stars , 2003 .

[73]  D. Soderblom,et al.  Rotation and activity among solar-type stars of the Ursa Major Group , 1993 .

[74]  Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope Wide Field P , 2002, astro-ph/0211470.

[75]  E. Young,et al.  A Spitzer Space Telescope Study of Disks in the Young σ Orionis Cluster , 2007, astro-ph/0701476.

[76]  K. Zebrun,et al.  OGLE 2003-BLG-235/MOA 2003-BLG-53: A Planetary Microlensing Event , 2004 .

[77]  J. Valenti,et al.  Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs , 2005 .

[78]  Klaus G. Strassmeier,et al.  The Vienna-KPNO search for Doppler-imaging candidate stars - I. A catalog of stellar-activity indicators for 1058 late-type Hipparcos stars , 2000 .

[79]  S. Kenyon,et al.  Variations on Debris Disks: Icy Planet Formation at 30-150 AU for 1-3 M☉ Main-Sequence Stars , 2008, 0807.1134.

[80]  T. Löhne,et al.  Dust distributions in debris disks: effects of gravity, radiation pressure and collisions , 2006 .

[81]  M. Jura,et al.  A Possible Massive Asteroid Belt around ζ Leporis , 2001 .

[82]  A. Moro-martin,et al.  The Complete Census of 70 μm-Bright Debris Disks within “The Formation and Evolution of Planetary Systems” Spitzer Legacy Survey of Sun-like Stars , 2007, 0801.0163.

[83]  Scott J. Kenyon,et al.  Planet Formation around Stars of Various Masses: The Snow Line and the Frequency of Giant Planets , 2007, 0710.1065.

[84]  I. Reid,et al.  Meeting the Cool Neighbors. I. Nearby Stars in the NLTT Catalogue: Defining the Sample , 2002, astro-ph/0202459.

[85]  H. M. Johnson.  An unbiased X-ray sampling of stars within 25 parsecs of the sun , 1986 .

[86]  M. Schwartz,et al.  Discovery of Seven T Tauri Stars and a Brown Dwarf Candidatein the Nearby TW Hydrae Association , 1998, astro-ph/9812189.

[87]  W. Lawson,et al.  Rotation periods for stars of the TW Hydrae association: the evidence for two spatially and rotationally distinct pre-main-sequence populations , 2005, astro-ph/0501497.

[88]  P. Kalas,et al.  FOMALHAUT'S DEBRIS DISK AND PLANET: CONSTRAINING THE MASS OF FOMALHAUT B FROM DISK MORPHOLOGY , 2008, 0811.1985.

[89]  Paul S. Smith,et al.  Reduction Algorithms for the Multiband Imaging Photometer for Spitzer , 2005, astro-ph/0502079.

[90]  Evidence for Mass-dependent Circumstellar Disk Evolution in the 5 Myr Old Upper Scorpius OB Association , 2006, astro-ph/0609372.

[91]  D. Wonnacott,et al.  Optical identification of EUV sources from the ROSAT Wide Field Camera all-sky survey , 1995 .

[92]  M. Barlow,et al.  Candidate Main-Sequence Stars with Debris Disks: A New Sample of Vega-like Sources , 1998 .

[93]  Bruce E. Woodgate,et al.  Space Telescope Imaging Spectrograph Coronagraphic Observations of β Pictoris , 2000 .

[94]  K. A. Marsh,et al.  Image of Fomalhaut Dust Ring at 350 Microns: The Relative Column Density Map Shows Pericenter-Apocenter Asymmetry , 2005 .

[95]  Jorge Ricardo Ducati,et al.  Catalogue of Stellar Photometry in Johnson's 11-color system. , 2002 .

[96]  S. Wolf,et al.  FORMATION AND EVOLUTION OF PLANETARY SYSTEMS: PROPERTIES OF DEBRIS DUST AROUND SOLAR-TYPE STARS , 2008, 0810.1003.

[97]  M. Ressler,et al.  Mid-Infrared Imaging of a Circumstellar Disk around HR 4796: Mapping the Debris of Planetary Formation , 1998, astro-ph/9806268.

[98]  J. Mermilliod,et al.  Catalogue of Mean UBV Data on Stars , 1994 .

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

[100]  Chromospheric activity, lithium and radial velocities of single late-type stars possible members of young moving groups , 2001, astro-ph/0110066.

[101]  Thomas L. Hayward,et al.  Mid-infrared images of beta Pictoris and the possible role of planetesimal collisions in the central disk. , 2005, Nature.

[102]  Ages of A-Type Vega-like Stars from uvbyβ Photometry , 2000, astro-ph/0010102.

[103]  et al,et al.  New Debris Disks around Nearby Main-Sequence Stars: Impact on the Direct Detection of Planets , 2006, astro-ph/0611682.

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

[105]  DUST DYNAMICS, SURFACE BRIGHTNESS PROFILES, AND THERMAL SPECTRA OF DEBRIS DISKS: THE CASE OF AU MICROSCOPII , 2005, astro-ph/0510527.

[106]  P. Plavchan,et al.  A Spitzer Study of Debris Disks in the Young Nearby Cluster NGC 2232: Icy Planets Are Common around ~1.5-3 M☉ Stars , 2008, 0807.2056.

[107]  IRS Spectra of Solar-Type Stars: A Search for Asteroid Belt Analogs , 2006, astro-ph/0601468.

[108]  Ben Zuckerman,et al.  The AB Doradus Moving Group , 2004 .

[109]  Search for Cold Debris Disks around M-dwarfs , 2006, astro-ph/0609574.

[110]  David A. Golimowski,et al.  Hubble Space Telescope Advanced Camera for Surveys Coronagraphic Imaging of the AU Microscopii Debris Disk , 2005 .

[111]  Alice C. Quillen,et al.  Predictions for a planet just inside Fomalhaut's eccentric ring , 2006, astro-ph/0605372.

[112]  C. Lada,et al.  New M Dwarf Debris Disk Candidates in NGC 2547 , 2008, 0807.3597.

[113]  S. Dermott,et al.  A circumsolar ring of asteroidal dust in resonant lock with the Earth , 1994, Nature.

[114]  T. Jenness,et al.  Structure in the ∊ Eridani Debris Disk , 2005 .

[115]  Michael R. Meyer,et al.  Evolution of Mid-Infrared Excess around Sun-like Stars: Constraints on Models of Terrestrial Planet Formation , 2007, 0712.1057.

[116]  On the AU Microscopii debris disk. Density profiles, grain properties, and dust dynamics , 2006, astro-ph/0604313.

[117]  J. Linsky,et al.  Measured Mass-Loss Rates of Solar-like Stars as a Function of Age and Activity , 2002, astro-ph/0203437.

[118]  C. Chase-Dunn,et al.  Rise and Fall , 2000, Social Science History.

[119]  S. Kenyon,et al.  Planet formation around M-dwarfs: the moving snow line and super-Earths , 2007 .

[120]  David MakovozFrancine R. Marleau.  Point‐Source Extraction with MOPEX , 2004 .

[121]  J. Carpenter,et al.  SPITZER SPECTROSCOPY OF CIRCUMSTELLAR DISKS IN THE 5 Myr OLD UPPER SCORPIUS OB ASSOCIATION , 2009, 0901.4120.

[122]  R. Rosenfeld.  Nature , 2009, Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery.

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

[124]  S. J. Hogeveen,et al.  The mass-ratio distribution of spectroscopic binary stars , 1992 .

[125]  P. North,et al.  Automated spectroscopic abundances of A and F-type stars using echelle spectrographs - II. Abundances of 140 A-F stars from ELODIE and CORALIE , 2002, astro-ph/0210065.

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

[127]  G. Rieke,et al.  Spitzer IRAC and JHKs Observations of h and χ Persei: Constraints on Protoplanetary Disk and Massive Cluster Evolution at ~107 Years , 2007, astro-ph/0701441.

[128]  O. Szewczyk,et al.  Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing , 2006, Nature.

[129]  S. Strom,et al.  Are wide pre-main-sequence binaries coeval? , 1994 .

[130]  S. Barnes.  Accepted for publication in The Astrophysical Journal Ages for illustrative field stars using gyrochronology: viability, limitations and errors , 2022 .

[131]  L. Pasquini,et al.  The Wilson-Bappu Effect: a tool to determine stellar distances. , 2003, astro-ph/0301637.

[132]  S. Kenyon,et al.  Planet Formation around Low-Mass Stars: The Moving Snow Line and Super-Earths , 2006, astro-ph/0609140.

[133]  Prospects for detection of catastrophic collisions in debris disks , 2005, astro-ph/0503551.

[134]  An 850 μm survey for dust around solar-mass stars , 2005, astro-ph/0508165.

[135]  C. G. Tinney,et al.  Catalog of nearby exoplanets , 2006 .

[136]  K. Y. L. Su,et al.  Debris Disks around Sun-like Stars , 2007, 0710.5498.

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

[138]  M. Skrutskie,et al.  The Two Micron All Sky Survey (2MASS) , 2006 .

[139]  E. Gaidos,et al.  Spectroscopy and Photometry of Nearby Young Solar Analogs , 2000 .

[140]  Massimo Marengo,et al.  First Look at the Fomalhaut Debris Disk with the Spitzer Space Telescope , 2004 .

[141]  James Liebert,et al.  Post-T Tauri Stars in the Nearest OB Association , 2002, astro-ph/0205417.

[142]  B. Zuckerman,et al.  DUSTY DEBRIS AROUND SOLAR-TYPE STARS: TEMPORAL DISK EVOLUTION , 2001, astro-ph/0103185.

[143]  Gianpiero Tagliaferri,et al.  CLASSIFICATION OF EUV STELLAR SOURCES DETECTED BY THE ROSAT WFC. I. PHOTOMETRIC AND RADIAL VELOCITY STUDIES , 1999 .

[144]  Tucson,et al.  A Spitzer View of Protoplanetary Disks in the γ Velorum Cluster , 2008, 0806.2639.

[145]  E. Gaidos.  Nearby Young Solar Analogs. I. Catalog and Stellar Characteristics , 1998 .

[146]  Glenn Schneider,et al.  NICMOS Imaging of the HR 4796A Circumstellar Disk , 1999 .

[147]  F. Allard,et al.  The NextGen Model Atmosphere Grid for 3000 ≤ Teff ≤ 10,000 K , 1998, astro-ph/9807286.

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

[149]  B. J. Taylor.  Statistical cataloging of archival data for luminosity class IV-V stars. I. The epoch 2001 temperature catalog , 2003 .

[150]  D. Soderblom,et al.  Metallicity in the solar neighborhood out to 60 pc , 2006 .

[151]  M. Giampapa,et al.  The X-Ray View of the Low-Mass Stars in the Solar Neighborhood , 1995 .

[152]  Saul J. Adelman,et al.  Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group , 2003 .

[153]  H. Walker,et al.  COOL CIRCUMSTELLAR MATTER AROUND NEARBY MAIN-SEQUENCE STARS , 1988 .

[154]  B. Gustafson.  Physics of Zodiacal Dust , 1994 .

[155]  K. Luhman.  Young Low-Mass Stars and Brown Dwarfs in IC 348 , 1999, astro-ph/9905287.

[156]  T. Forveille,et al.  X-ray and molecular emission from the nearest region of recent star formation. , 1997, Science.

[157]  M. Schwartz,et al.  The TW Hydrae Association: Discovery of T Tauri Star Members Near HR 4796 , 2001 .

[158]  M. McElwain,et al.  Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs , 2006, astro-ph/0609555.

[159]  R. Hilditch,et al.  Eclipse observations of an accretion disc wind , 1995 .

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

[161]  G. Rieke,et al.  The Low-Mass Initial Mass Function in Young Clusters: L1495E , 1998 .

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

[163]  K. Y. L. Su,et al.  accepted for publication in ApJ Preprint typeset using L ATEX style emulateapj v. 2/19/04 DEBRIS DISK EVOLUTION AROUND A STARS , 2006 .

[164]  Astronomy,et al.  The Rise and Fall of Debris Disks: MIPS Observations of h and χ Persei and the Evolution of Mid-IR Emission from Planet Formation , 2007, 0709.2510.

[165]  Wayne S. Holland,et al.  Submillimeter Observations of an Asymmetric Dust Disk around Fomalhaut , 2003 .

[166]  T. Currie.  ON THE SEMIMAJOR AXIS DISTRIBUTION OF EXTRASOLAR GAS GIANT PLANETS: WHY HOT JUPITERS ARE RARE AROUND HIGH-MASS STARS , 2009, 0902.3459.

[167]  Marc J. Kuchner,et al.  The Geometry of Resonant Signatures in Debris Disks with Planets , 2002, astro-ph/0209261.

[168]  D. James,et al.  RE 1816+541: a northern hemisphere analogue to the low-mass rapid rotator HK Aqr , 1994 .