Debris Disks of Members of the Blanco 1 Open Cluster

Abstract

We have used the Spitzer Space Telescope to obtain Multiband Imaging Photometer for Spitzer (MIPS) 24 um photometry for 37 members of the ~100 Myr old open cluster Blanco 1. For the brightest 25 of these stars (where we have 3sigma uncertainties less than 15%), we find significant mid-IR excesses for eight stars, corresponding to a debris disk detection frequency of about 32%. The stars with excesses include two A stars, four F dwarfs and two G dwarfs. The most significant linkage between 24 um excess and any other stellar property for our Blanco 1 sample of stars is with binarity. Blanco 1 members that are photometric binaries show few or no detected 24 um excesses whereas a quarter of the apparently single Blanco 1 members do have excesses. We have examined the MIPS data for two other clusters of similar age to Blanco 1 -- NGC 2547 and the Pleiades. The AFGK photometric binary star members of both of these clusters also show a much lower frequency of 24 um excesses compared to stars that lie near the single-star main sequence. We provide a new determination of the relation between V-Ks color and Ks-[24] color for main sequence photospheres based on Hyades members observed with MIPS. As a result of our analysis of the Hyades data, we identify three low mass Hyades members as candidates for having debris disks near the MIPS detection limit.

Accepted to ApJ

References in corpus (14)

• Debris Disk Evolution Around A Stars
• Formation and Evolution of Planetary Systems (FEPS): Properties of Debris Dust around Solar-type Stars
• New Debris Disks Around Nearby Main Sequence Stars: Impact on The Direct Detection of Planets
• Near and Mid-IR Photometry of the Pleiades, and a New List of Substellar Candidate Members
• Spitzer/MIPS Observations of Stars in the Beta Pictoris Moving Group
• Spitzer 24 Micron Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars
• The Formation and Evolution of Planetary Systems: Description of the Spitzer Legacy Science Database
• Spitzer 24 micron Survey of Debris Disks in the Pleiades
• Debris Disks in NGC 2547
• The lower mass function of the young open cluster Blanco 1: from 30 Mjup to 3 Mo
• Spitzer observations of the Hyades: Circumstellar debris disks at 625 Myr of age
• A Spitzer Study of Debris Disks In The Young Nearby Cluster NGC 2232: Icy Planets Are Common Around ~ 1.5--3 Solar-Mass Stars
• A radiation driven implosion model for the enhanced luminosity of protostars near HII regions
• A New X-Ray Analysis of the Open Cluster Blanco 1 Using Wide-Field BVIc Photometric and Proper Motion Surveys

Cited by in corpus (13)

• Debris from terrestrial planet formation: the Moon-forming collision
• NGTS clusters survey. I. Rotation in the young benchmark open cluster Blanco 1
• The Incidence of Debris Disks at 24 μm and 670 Myr
• Variations on Debris Disks III. Collisional Cascades and Giant Impacts in the Terrestrial Zones of Solar-type Stars
• Near-infrared Linear Polarization of Ultracool Dwarfs
• Rocky Planet Formation: Quick and Neat
• Debris discs in the 27 Myr old open cluster IC4665
• The Faintest WISE Debris Disks: Enhanced Methods for Detection and Verification
• Dust discs around intermediate mass and Sun-like stars in the 16 Myr old NGC 1960 open cluster
• Variations on Debris Disks IV. An Improved Analytical Model for Collisional Cascades
• XHIP-II: Clusters and associations
• Searching for debris discs in the 30 Myr open cluster IC 4665
• Takeout and Delivery: Erasing the Dusty Signature of Late-stage Terrestrial Planet Formation