New M dwarf debris disk candidates in NGC 2547

Abstract

With only six known examples, M-dwarf debris disks are rare, even though M dwarfs constitute the majority of stars in the Galaxy. After finding a new M dwarf debris disk in a shallow mid-infrared observation of NGC 2547, we present a considerably deeper Spitzer-MIPS image of the region, with a maximum exposure time of 15 minutes per pixel. Among sources selected from a previously published membership list, we identify nine new M dwarfs with excess emission at 24 micron tracing warm material close to the snow line of these stars, at orbital radii of less than 1 AU. We argue that these are likely debris disks, suggesting that planet formation is under way in these systems. Interestingly, the estimated excess fraction of M stars appears to be higher than that of G and K stars in our sample.

16 pages, 8 figures; accepted for publication in ApJ

References in corpus (41)

• The USNO-B Catalog
• The NextGen Model Atmosphere grid for $3000\le \Teff \le 10000\K$
• Interpreting Spectral Energy Distributions from Young Stellar Objects. II. Fitting observed SEDs using a large grid of pre-computed models
• Circumstellar Dust Disks in Taurus-Auriga: The Submillimeter Perspective
• Observations of IC348: The Disk Population at 2-3 Million Years
• The NextGen Model Atmosphere grid: II. Spherically symmetric model atmospheres for giant stars with effective temperatures between 3000 and 6800~K
• Stellar Multiplicity and the IMF: Most Stars Are Single
• Debris disks around Sun-like stars
• Point Source Extraction with MOPEX
• Discovery of a large dust disk around the nearby star AU Microscopium
• The Complete Census of 70-um-Bright Debris Disks within the FEPS (Formation and Evolution of Planetary Systems) Spitzer Legacy Survey of Sun-like Stars
• Age dependence of the Vega Phenomenon: Theory
• Dust Dynamics, Surface Brightness Profiles, and Thermal Spectra of Debris Disks: The Case of AU Mic
• Substructure in the Circumstellar Disk around the Young Star AU Mic (GJ 803)
• Prospects for Detection of Catastrophic Collisions in Debris Disks
• A maximum likelihood method for fitting colour-magnitude diagrams
• Exploring Terrestrial Planet Formation in the TW Hydrae Association
• Where Are The M Dwarf Disks Older Than 10 Million Years?
• Detecting the Dusty Debris of Terrestrial Planet Formation
• The Lithium Depletion Boundary in NGC 2547 as a test of pre-main-sequence evolutionary models
• A Sub-Millimeter Search of Nearby Young Stars for Cold Dust: Discovery of Debris Disks around Two Low-Mass Stars
• Evolution of Mid-IR Excess Around Sun-like Stars: Constraints on Models of Terrestrial Planet Formation
• Far Infrared Prperties of M Dwarfs
• Constraining the Lifetime of Circumstellar Disks in the Terrestrial Planet Zone: A Mid-IR Survey of the 30-Myr-old Tucana-Horologium Association
• The Rise and Fall of Debris Disks: MIPS Observations of h and chi Persei and the Evolution of Mid-IR Emission from Planet Formation
• Optimal photometry for colour-magnitude diagrams and its application to NGC 2547
• A Possible Massive Asteroid Belt Around zeta Lep
• Spitzer 24 micron Survey of Debris Disks in the Pleiades
• The Monitor project: Rotation of low-mass stars in the open cluster NGC 2547
• Debris Disks in NGC 2547
• On the difference between nuclear and contraction ages
• An m sin i = 24 Earth Mass Planetary Companion To The Nearby M Dwarf GJ 176
• Search for Cold Debris Disks around M-dwarfs
• Low mass stars, brown dwarf candidates and the mass function of the young open cluster NGC 2547
• An XMM-Newton observation of the young open cluster NGC 2547: coronal activity at 30 Myr
• Mass and Temperature of the TWA 7 Debris Disk
• A Search for Warm Circumstellar Disks in the TW Hydrae Association
• The lithium depletion boundary and the age of NGC 2547
• M-type Vega-like stars
• Cool stars in NGC 2547 and pre main sequence lithium depletion
• Spitzer Observations of Nearby M Dwarfs

Cited by in corpus (19)

• New Debris Disks Around Young, Low Mass Stars Discovered With The Spitzer Space Telescope
• The Last Gasp of Gas Giant Planet Formation: A Spitzer Study of the 5 Myr-old Cluster NGC 2362
• Structure and evolution of debris disks around F-type stars: I. Observations, database and basic evolutionary aspects
• Debris Disks in the Upper Scorpius OB Association
• A DEBRIS Disk Around The Planet Hosting M-star GJ581 Spatially Resolved with Herschel
• Peter Pan Disks: Long-lived Accretion Disks Around Young M Stars
• Search for Cold Debris Disks around M-dwarfs. II
• Collisional modelling of the AU Microscopii debris disc
• The AU Mic Debris Disk: far-infrared and submillimeter resolved imaging
• Warm Dust around Cool Stars: Field M Dwarfs with WISE 12 or 22 Micron Excess Emission
• The first 40 million years of circumstellar disk evolution: the signature of terrestrial planet formation
• A WISE-based search for debris discs amongst M-dwarfs in nearby, young, moving groups
• A Deep Spitzer Survey of Circumstellar Disks in the Young Double Cluster, h and chi Persei
• Predicting the incidence of planets and debris discs as a function of stellar mass
• Observability of Debris Discs around M-stars
• The Planet Formation Potential Around a 45 Myr old Accreting M Dwarf
• IRS Characterization of a Debris Disk around an M-type star in NGC2547
• A young hierarchical triple system harbouring a candidate debris disc
• The Debris Disk Fraction for M-dwarfs in Nearby, Young, Moving Groups