A 1500 deg2 near infrared proper motion catalogue from the UKIDSS Large Area Survey

Smith, Leigh C.; Lucas, P. W.; Burningham, B.; Jones, H. R. A.; Smart, R. L.; Andrei, A. H.; Catalán, S.; Pinfield, D. J.

doi:10.1093/mnras/stt2156

Cited by 26 publications

(30 citation statements)

References 76 publications

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“…Several studies have found clear evidence for dynamically cold (slow-moving) and hot (fast-moving) populations of ultracool dwarfs that are consistent with thin disk and thick disk/halo populations (e.g., Faherty et al 2009;Schmidt et al 2010;Dupuy & Liu 2012), implying that ultracool dwarfs form in the same manner as hotter stars. Searches for high proper motion objects, often using surveys with shorter time baselines, have identified rare, fast-moving objects that are typically members of the older, low-metallicity populations (e.g., Jameson et al 2008;Kirkpatrick et al 2014;Smith et al 2014b) or very nearby, previously overlooked objects (e.g., Luhman 2014; Luhman & Sheppard 2014;Kirkpatrick et al 2016;Schneider et al 2016a). Proper motions measured from the large surveys have enabled us to identify the substellar members of nearby young moving groups (e.g., Gagné et al 2015cGagné et al , 2015bFaherty et al 2016;Liu et al 2016), a population crucial to our understanding of brown dwarf evolution over their first few hundred million years.…”

Section: Introductionmentioning

confidence: 99%

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 π Survey

Best

Magnier

Liu

et al. 2017

ApJS

111

110

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractWe present a catalog of 9888 M, L and T dwarfs detected in the Pan-STARRS13π Survey (PS1), covering threequarters of the sky. Our catalog contains nearly all known objects of spectral types L0-T2 in the PS1 field, with objects as early as M0 and as late as T9, and includes PS1, 2MASS, AllWISE, and GaiaDR1 photometry. We analyze the different types of photometry reported by PS1 and use two types in our catalog in order to maximize both depth and accuracy. Using parallaxes from the literature, we construct empirical SEDs for field ultracool dwarfs spanning 0.5-12 μm. We determine typical colors of M0-T9 dwarfs and highlight the distinctive colors of subdwarfs and young objects. We combine astrometry from PS1, 2MASS, and GaiaDR1 to calculate new proper motions for our catalog. We achieve a median precision of 2.9mas yr −1 , a factor of ≈3−10 improvement over previous large catalogs. Our catalog contains proper motions for 2405M6-T9 dwarfs and includes the largest set of homogeneous proper motions for L and T dwarfs published to date, 406objects for which there were no previous measurements, and 1176objects for which we improve upon previous literature values. We analyze the kinematics of ultracool dwarfs in our catalog and find evidence that bluer but otherwise generic late-M and Lfield dwarfs (i.e., not subdwarfs) tend to have tangential velocities higher than those of typical field objects. With the public release of the PS1 data, this survey will continue to be an essential tool for characterizing the ultracool dwarf population.

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Section: Introductionmentioning

confidence: 99%

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 π Survey

Best

Magnier

Liu

et al. 2017

ApJS

111

110

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“…The sample targeted a limited section of the L and T sequence and required substantial follow-up resources: at J 17.5 a near-infrared spectrum good enough for classification to one spectral sub-type requires about 30 min on an 8 m class telescope. A&A 574, A78 (2015) the measurement of the luminosity function and also allows a variety of studies, such as measuring the brown-dwarf scale height (Ryan et al 2005;Jurić et al 2008), the frequency of binarity (Burgasser et al 2006c;Burgasser 2007;Luhman 2012) and, if proper motions can be measured, kinematic studies (Faherty et al 2009(Faherty et al , 2012Schmidt et al 2010;Smith et al 2014). A large sample can also be used to identify rare, unusual objects (e.g.…”

Section: Introductionmentioning

confidence: 99%

Photometric brown-dwarf classification

Skrzypek

Warren

Faherty

et al. 2015

A&A

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Aims. We present a method, named photo-type, to identify and accurately classify L and T dwarfs onto the standard spectral classification system using photometry alone. This enables the creation of large and deep homogeneous samples of these objects efficiently, without the need for spectroscopy. Methods. We created a catalogue of point sources with photometry in 8 bands, ranging from 0.75 to 4.6 μm, selected from an area of 3344 deg 2 , by combining SDSS, UKIDSS LAS, and WISE data. Sources with 13.0 < J < 17.5, and Y − J > 0.8, were then classified by comparison against template colours of quasars, stars, and brown dwarfs. The L and T templates, spectral types L0 to T8, were created by identifying previously known sources with spectroscopic classifications, and fitting polynomial relations between colour and spectral type. Results. Of the 192 known L and T dwarfs with reliable photometry in the surveyed area and magnitude range, 189 are recovered by our selection and classification method. We have quantified the accuracy of the classification method both externally, with spectroscopy, and internally, by creating synthetic catalogues and accounting for the uncertainties. We find that, brighter than J = 17.5, photo-type classifications are accurate to one spectral sub-type, and are therefore competitive with spectroscopic classifications. The resultant catalogue of 1157 L and T dwarfs will be presented in a companion paper.

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“…However, cool objects are intrinsically faint in the optical and emit most of their light in the near infrared (NIR). Therefore, the searches for unknown nearby sources gradually turn to the NIR wavelengths taking advantage of improved camera sensitivities, spatial and temporal resolution (Deacon et al 2009;Kirkpatrick et al 2010;Smith et al 2014), yielding in the last twenty years the discovery of over two thousand ultra-cool dwarfs. Widening the color space of the searches has helped to improve the stellar and sub-stellar density estimates in the solar neighborhood, and the frequency of low-mass companions, among other questions (Allen et al 2012;Luhman et al 2012;Dieterich et al 2012;Ivanov et al 2013;Deacon et al 2014;Davison et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric characterization of high proper motion sources fromWISE

Beamín

Ivanov

Minniti

et al. 2015

Mon. Not. R. Astron. Soc.

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The census of the solar neighborhood is almost complete for stars and becoming more complete in the brown dwarf regime. Spectroscopic, photometric and kinematic characterization of nearby objects helps us to understand the local mass function, the binary fraction, and provides new targets for sensitive planet searches. We aim to derive spectral types and spectro-photometric distances of a sample of new high proper motion sources found with the WISE satellite, and obtain parallaxes for those objects that fall within the area observed by the Vista Variables in the Vía Láctea survey (VVV). We used low resolution spectroscopy and template fitting to derive spectral types, multiwavelength photometry to characterize the companion candidates and obtain photometric distances. Multi-epoch imaging from the VVV survey was used to measure the parallaxes and proper motions for three sources. We confirm a new T2 brown dwarf within ∼15 pc. We derived optical spectral types for twenty four sources, mostly M dwarfs within 50 pc. We addressed the wide binary nature of sixteen objects found by the WISE mission and previously known high proper motion sources. Six of these are probably members of wide binaries, two of those are new, and present evidence against the physical binary nature of two candidate binary stars found in the literature, and eight that we selected as possible binary systems. We discuss a likely microlensing event produced by a nearby low mass star and a galaxy, that is to occur in the following five years.

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A 1500 deg2 near infrared proper motion catalogue from the UKIDSS Large Area Survey

Cited by 26 publications

References 76 publications

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 π Survey

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 π Survey

Photometric brown-dwarf classification

Spectrophotometric characterization of high proper motion sources fromWISE

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