Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey: I The Pleiades

Abstract

We present the results of a deep wide-field near-infrared survey of the entire Pleiades cluster recently released as part of the UKIRT Infrared Deep Sky (UKIDSS) Galactic Clusters Survey (GCS) Data Release 9 (DR9). We have identified a sample of ~1000 Pleiades cluster member candidates combining photometry in five near-infrared passbands and proper motions derived from the multiple epochs provided by the UKIDSS GCS DR9. We also provide revised membership for all previously published Pleiades low-mass stars and brown dwarfs in the past decade recovered in the UKIDSS GCS DR9 Pleiades survey based on the new photometry and astrometry provided by the GCS. We find no evidence of K-band variability in the Pleiades members larger than ~0.08 mag. In addition, we infer a substellar binary frequency of 22-31% in the 0.075-0.03 Msun range for separations less than ~100 au. We employed two independent but complementary methods to derive the cluster luminosity and mass functions: a probabilistic analysis and a more standard approach consisting of stricter astrometric and photometric cuts. We found that the resulting luminosity and mass functions obtained from both methods are very similar. We derive the Pleiades mass function in the 0.6-0.03 Msun mass range and found that it is best reproduced by a log-normal representation with a mean characteristic mass of 0.24(+0.01-0.03) Msun, in agreement with earlier studies and the extrapolation of the field mass function.

MNRAS, in press: 17 pages, 11 figures, 4 tables in main text, 4 additional tables in appendix. Abstract and column names in Tables 3 and 4 corrected compared to MNRAS's accepted version

References in corpus (32)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Models of Stars, Brown Dwarfs and Exoplanets
• The WFCAM Science Archive
• The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
• Evolution, nucleosynthesis and yields of low mass AGB stars at different metallicities (II): the FRUITY database
• The Stellar Populations of Praesepe and Coma Berenices
• The Effects of Radiative Transfer on Low-Mass Star Formation
• The Stellar Population of the Chamaeleon I Star-Forming Region
• The Disk Population of the Upper Scorpius Association
• Near and Mid-IR Photometry of the Pleiades, and a New List of Substellar Candidate Members
• New isolated planetary mass objects and the stellar and substellar mass function of the sigma Orionis cluster
• A Cross-Match of 2MASS and SDSS: Newly-Found L and T Dwarfs and an Estimate of the Space Densitfy of T Dwarfs
• A Survey for Spectroscopic Binaries Among Very Low-Mass Stars
• New Members of the Scorpius Centaurus Complex and Ages of its sub-regions
• New brown dwarfs in Upper Sco using UKIDSS Galactic Cluster Survey science verification data
• The effect of rotation on the abundances of the chemical elements of the A-type stars in the Praesepe cluster
• Abundances of four open clusters from solar stars
• Brown dwarfs and very low mass stars in the Hyades cluster : a dynamically evolved mass function
• Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
• Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey: I The Pleiades
• Proper motion L and T dwarf candidate members of the Pleiades
• Pleiades low-mass brown dwarfs: the cluster L dwarf sequence
• New members in the Upper Sco association from the UKIDSS Early Data Release
• A search for substellar members in the Praesepe and sigma Orionis clusters
• The substellar population of Sigma Orionis: A deep wide survey
• Quantifying the Universality of the Stellar Initial Mass Function in Old Star Clusters
• Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey: II The Alpha Persei open cluster
• NICMOS/HST Observations of the Embedded Cluster Associated with Mon R2: Constraining the sub-stellar Initial Mass Function
• New brown dwarfs in the south part of the Upper Scorpius Association
• Testing the fragmentation limit in the Upper Sco association
• Not Alone: Tracing the Origins of Very Low Mass Stars and Brown Dwarfs Through Multiplicity Studies
• Searching for initial mass function variations in resolved stellar populations

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• Lost Sisters Found: TESS and Gaia Reveal a Dissolving Pleiades Complex
• A review on substellar objects beyond the deuterium burning mass limit: planets, brown dwarfs or what?
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