Two T dwarfs from the UKIDSS early data release

Kendall, T. R.; Tamura, Motohide; Tinney, C. G.; Martín, E. L.; Ishii, Miki; Pinfield, D. J.; Lucas, P. W.; Jones, H. R. A.; Leggett, S. K.; Dye, S.; Hewett, Paul C.; Allard, F.; Baraffe, I.; Barrado, D.; Carraro, G.; Casewell, Sarah L.; Chabrier, G.; Chappelle, R. J.; Clarke, Fraser; Day-Jones, A. C.; Deacon, N. R.; Dobbie, P. D.; Folkes, S. L.; Hambly, N. C.; Hodgkin, S. T.; Nakajima, Tadashi; Jameson, R. F.; Lodieu, N.; Magazzù, A.; McCaughrean, M. J.; Pavlenko, Ya. V.; Tadashi, N.; Osorio, M. R. Zapatero

doi:10.1051/0004-6361:20066403

Cited by 32 publications

(28 citation statements)

References 15 publications

(22 reference statements)

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“…The first T dwarf discoveries from UKIDSS are confirming the survey's powerful red object finding capability (e.g. Kendall et al 2007;Lodieu et al 2007;Warren et al 2007b).…”

Section: Introductionmentioning

confidence: 79%

Four faint T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Southern Stripe

Chiu

Liu

Jiang

et al. 2008

Monthly Notices of the Royal Astronomical Society: Letters

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We present the optical and near‐infrared photometry and spectroscopy of four faint T dwarfs newly discovered from the UKIDSS first data release. The sample, drawn from an imaged area of ∼136 deg2 to a depth of Y= 19.9 (5σ, Vega), is located in the Sloan Digital Sky Survey (SDSS) Southern Equatorial Stripe, a region of significant future deep imaging potential. We detail the selection and followup of these objects, three of which are spectroscopically confirmed brown dwarfs ranging from type T2.5 to T7.5, and one is photometrically identified as early T. Their magnitudes range from Y= 19.01 to 19.88 with derived distances from 34 to 98 pc, making these among the coldest and faintest brown dwarfs known. The T7.5 dwarf appears to be single based on 0.05‐arcsec images from Keck laser guide star adaptive optics. The sample brings the total number of T dwarfs found or confirmed by UKIDSS data in this region to nine, and we discuss the projected numbers of dwarfs in the future survey data. We estimate that ∼240 early and late T dwarfs are discoverable in the UKIDSS Large Area Survey (LAS) data, falling significantly short of published model projections and suggesting that initial mass functions and/or birth rates may be at the low end of possible models. Thus, deeper optical data have good potential to exploit the UKIDSS survey depth more fully, but may still find the potential Y dwarf sample to be extremely rare.

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“…The first T dwarf discoveries from UKIDSS are confirming the survey's powerful red object finding capability (e.g. Kendall et al 2007;Lodieu et al 2007;Warren et al 2007b).…”

Section: Introductionmentioning

confidence: 79%

Four faint T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Southern Stripe

Chiu

Liu

Jiang

et al. 2008

Monthly Notices of the Royal Astronomical Society: Letters

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“…b No good standard comparison was found; the best match in the SpeX prism library was the L5.5 2MASS J17502484-0016151 (Kendall et al 2007). c Using spectral decomposition we determined that HIP 6407B is likely itself a double consisting of an L1 and a T5.…”

Section: Notesmentioning

confidence: 99%

WIDE COOL AND ULTRACOOL COMPANIONS TO NEARBY STARS FROM Pan-STARRS 1

Deacon

Liu

Magnier

et al. 2014

ApJ

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We present the discovery of 57 wide (>5 ) separation, low-mass (stellar and substellar) companions to stars in the solar neighborhood identified from Pan-STARRS 1 (PS1) data and the spectral classification of 31 previously known companions. Our companions represent a selective subsample of promising candidates and span a range in spectral type of K7-L9 with the addition of one DA white dwarf. These were identified primarily from a dedicated common proper motion search around nearby stars, along with a few as serendipitous discoveries from our Pan-STARRS 1 brown dwarf search. Our discoveries include 23 new L dwarf companions and one known L dwarf not previously identified as a companion. The primary stars around which we searched for companions come from a list of bright stars with well-measured parallaxes and large proper motions from the Hipparcos catalog (8583 stars, mostly A-K dwarfs) and fainter stars from other proper motion catalogs (79170 stars, mostly M dwarfs). We examine the likelihood that our companions are chance alignments between unrelated stars and conclude that this is unlikely for the majority of the objects that we have followed-up spectroscopically. We also examine the entire population of ultracool (>M7) dwarf companions and conclude that while some are loosely bound, most are unlikely to be disrupted over the course of ∼10 Gyr. Our search increases the number of ultracool M dwarf companions wider than 300 AU by 88% and increases the number of L dwarf companions in the same separation range by 82%. Finally, we resolve our new L dwarf companion to HIP 6407 into a tight (0. 13, 7.4 AU) L1+T3 binary, making the system a hierarchical triple. Our search for these key benchmarks against which brown dwarf and exoplanet atmosphere models are tested has yielded the largest number of discoveries to date.

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“…Burgasser et al 1999), the Sloan digital Sky Survey (SDSS; e.g. Leggett et al 2000), the UKIRT Infrared Deep Sky Survey (UKIDSS; Lawrence et al 2007) Large Area Survey (Kendall et al 2007;Lodieu et al 2007;Pinfield et al 2008;Chiu et al 2008;Burningham et al 2010a;Scholz 2010;Scholz et al 2012), the UKIDSS Galactic Clusters Survey (Lodieu et al 2009a), the UKIDSS Deep Extragalactic Survey (Lodieu et al 2009b), the CFHT Brown Dwarf Survey (Delorme et al 2008a,b;Albert et al 2011), the Wide-Field Infrared Survey Explorer A&A 548, A53 (2012) (WISE; Mainzer et al 2011;Kirkpatrick et al 2011;Scholz et al 2011;Wright et al 2012), and more recently Pan-Starrs Liu et al 2011;Deacon et al 2012b,a). The frontier between T and Y dwarfs originally proposed by Kirkpatrick et al (1999) has now been crossed with the recent announcement of 13 Y dwarfs by the WISE team Kirkpatrick et al 2012).…”

Section: Introductionmentioning

confidence: 99%

First T dwarfs in the VISTA Hemisphere Survey

Lodieu

Burningham

Day-Jones

et al. 2012

A&A

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Aims. The aim of the project is to improve our current knowledge of the density of T dwarfs and the shape of the substellar initial mass function by identifying a magnitude-limited sample of T dwarfs in the full southern sky. Methods. We present the results of a photometric search aimed at discovering cool brown dwarfs in the southern sky imaged at infrared wavelengths by the Visible and Infrared Survey Telescope for Astronomy (VISTA) and the Wide Infrared Survey Explorer (WISE) satellite mission. We combined the first data release (DR1) of the VISTA Hemisphere Survey (VHS) and the WISE preliminary data release to extract candidates with red mid-infrared colours and near-to mid-infrared colours characteristics of cool brown dwarfs. Results. The VHS DR1 vs. WISE search returned tens of T dwarf candidates, 13 of which are presented here, including two previously published in the literature and five new ones confirmed spectroscopically with spectral types between T4.5 and T8. We estimate that the two T6 dwarfs lie within 16 pc and the T4.5 within 25 pc. The remaining three are 30-50 pc distant. The only T7 dwarf in our sample is the faintest of its spectral class with J = 19.28 mag. The other six T dwarf candidates remain without spectroscopic follow-up. We also improve our knowledge on the proper motion accuracy for three bright T dwarfs by combining multi-epoch data from public databases (DENIS, 2MASS, VHS, WISE, Spitzer).

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Two T dwarfs from the UKIDSS early data release

Cited by 32 publications

References 15 publications

Four faint T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Southern Stripe

Four faint T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Southern Stripe

WIDE COOL AND ULTRACOOL COMPANIONS TO NEARBY STARS FROM Pan-STARRS 1

First T dwarfs in the VISTA Hemisphere Survey

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