Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function

Abstract

We present the discovery of another seven Y dwarfs from the Wide-field Infrared Survey Explorer (WISE). Using these objects, as well as the first six WISE Y dwarf discoveries from Cushing et al., we further explore the transition between spectral types T and Y. We find that the T/Y boundary roughly coincides with the spot where the J-H colors of brown dwarfs, as predicted by models, turn back to the red. Moreover, we use preliminary trigonometric parallax measurements to show that the T/Y boundary may also correspond to the point at which the absolute H (1.6 um) and W2 (4.6 um) magnitudes plummet. We use these discoveries and their preliminary distances to place them in the larger context of the Solar Neighborhood. We present a table that updates the entire stellar and substellar constituency within 8 parsecs of the Sun, and we show that the current census has hydrogen-burning stars outnumbering brown dwarfs by roughly a factor of six. This factor will decrease with time as more brown dwarfs are identified within this volume, but unless there is a vast reservoir of cold brown dwarfs invisible to WISE, the final space density of brown dwarfs is still expected to fall well below that of stars. We also use these new Y dwarf discoveries, along with newly discovered T dwarfs from WISE, to investigate the field substellar mass function. We find that the overall space density of late-T and early-Y dwarfs matches that from simulations describing the mass function as a power law with slope -0.5 < alpha < 0.0; however, a power-law may provide a poor fit to the observed object counts as a function of spectral type because there are tantalizing hints that the number of brown dwarfs continues to rise from late-T to early-Y. More detailed monitoring and characterization of these Y dwarfs, along with dedicated searches aimed at identifying more examples, are certainly required.

91 pages, 15 figures, accepted for publication in The Astrophysical Journal

References in corpus (28)

• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
• The Stellar Population of the Chamaeleon I Star-Forming Region
• Discovery of Two T Dwarf Companions with the Spitzer Space Telescope
• A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages
• Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition
• Discovery of 11 New T Dwarfs in the Two Micron All-Sky Survey, Including a Possible L/T Transition Binary
• CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition?
• A very cool brown dwarf in UKIDSS DR1
• A Cross-Match of 2MASS and SDSS: Newly-Found L and T Dwarfs and an Estimate of the Space Densitfy of T Dwarfs
• The discovery of an M4+T8.5 binary system
• Exploring the substellar temperature regime down to ~550K
• Physical parameters of two very cool T dwarfs
• Evidence for a Turnover in the IMF of Low Mass Stars and Sub-stellar Objects: Analysis from an Ensemble of Young Clusters
• HD3651B: the first directly imaged brown dwarf companion of an exoplanet host star
• Discovery of a T Dwarf Binary with the Largest Known J-Band Flux Reversal
• The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9m Program: 20 New Members of the 25 Parsec White Dwarf Sample
• Meeting the Cool Neighbors X: Ultracool dwarfs from the 2MASS All-Sky Data Release
• Optical emission line properties of Narrow Line Seyfert 1s and comparison AGN
• Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
• Discovery of 9 New Companions to Nearby Young M Stars with the Altair AO System
• Proper motion L and T dwarf candidate members of the Pleiades
• Five new very low mass binaries
• Trigonometric parallaxes of ten ultracool subdwarfs
• The very nearby M/T dwarf binary SCR 1845-6357
• Improved orbital solution and masses for the very low-mass multiple system LHS 1070
• Spectral type dependent rotational braking and strong magnetic flux in three components of the late-M multiple system LHS 1070
• Two distant brown dwarfs in the UKIRT Infrared Deep Sky Survey Deep Extragalactic Survey Data Release 2

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