UKIDSS detections of cool brown dwarfs

Scholz, R.‐D.; Bihain, G.; Schnurr, O.; Storm, J.

doi:10.1051/0004-6361/201218947

Cited by 20 publications

(21 citation statements)

References 40 publications

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“…For our proper motion solutions listed in Table 1 we applied a weighted linear fitting over all available multi-epoch positions (N ep ), a method similar to that of Scholz et al (2012). We assumed 70 mas errors for the individual VHS DR1 positions taken from the catalogues in the VISTA Science Archive and 150 mas errors for the faint object detections in 2MASS and DENIS.…”

Section: Proper Motion Measurementsmentioning

confidence: 99%

“…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%

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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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Section: Proper Motion Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First T dwarfs in the VISTA Hemisphere Survey

Lodieu

Burningham

Day-Jones

et al. 2012

A&A

Self Cite

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“…Kinematic searches, on the other hand, avoid such a bias by using proper motion alone as a judge of distance. By identifying objects with large proper motions, unusual brown dwarfs overlooked by previous surveys can be identified (e.g., Metchev et al 2008;Deacon et al 2009;Sheppard & Cushing 2009;Artigau et al 2010;Kirkpatrick et al 2010;Deacon et al 2011;Gizis et al 2011;Liu et al 2011;Scholz et al 2011Scholz et al , 2012Scholz 2014).…”

Section: Introductionmentioning

confidence: 99%

A Proper Motion Survey Using the First Sky Pass of Neowise-Reactivation Data

Schneider

Greco

Cushing

et al. 2016

ApJ

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The Wide-field Infrared Survey Explorer (WISE) was reactivated in 2013 December (NEOWISE) to search for potentially hazardous near-Earth objects. We have conducted a survey using the first sky pass of NEOWISE data and the AllWISE catalog to identify nearby stars and brown dwarfs with large proper motions ( total m  250 mas yr −1 ). A total of 20,548 high proper motion objects were identified, 1006 of which are new discoveries. This survey has uncovered a significantly larger sample of fainter objects (W 2 13  mag) than the previous WISE motion surveys of Luhman and Kirkpatrick et al. Many of these objects are predicted to be new L and T dwarfs based on near-and mid-infrared colors. Using estimated spectral types along with distance estimates, we have identified several objects that likely belong to the nearby solar neighborhood (d < 25 pc). We have followed up 19 of these new discoveries with near-infrared or optical spectroscopy, focusing on potentially nearby objects, objects with the latest predicted spectral types, and potential late-type subdwarfs. This subset includes six M dwarfs, five of which are likely subdwarfs, as well as eight L dwarfs and five T dwarfs, many of which have blue near-infrared colors. As an additional supplement, we provide 2MASS and AllWISE positions and photometry for every object found in our search, as well as 2MASS/AllWISE calculated proper motions.

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“…Others used several of those surveys to identify new candidates (Aberasturi et al 2011;Scholz et al 2012) or added a second epoch of K-band astrometry, such as the UKIDSS Galactic Plane Survey (GPS; Lucas et al 2008), in which a new T5 dwarf and several other L and T dwarf candidates were recently discovered in the galactic plane (Smith et al 2014).…”

Section: Introductionmentioning

confidence: 99%

A Brown Dwarf Census From the Simp Survey

Jasmin

Gagné

Artigau

et al. 2016

ApJ

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We have conducted a near-infrared (NIR) proper motion survey, the Sondage Infrarouge de Mouvement Propre, in order to discover field ultracool dwarfs (UCD) in the solar neighborhood. The survey was conducted by imaging ∼ 28% of the sky with the Caméra PAnoramique Proche-InfraRouge both in the southern hemisphere at the Cerro Tololo Inter-American Observatory 1.5 m telescope, and in the northern hemisphere at the Observatoire du Mont-Mégantic 1.6 m telescope and comparing the source positions from these observations with the Two Micron All-Sky Survey Point Source Catalog (2MASS PSC). Additional color criteria were used to further discriminate unwanted astrophysical sources. We present the results of an NIR spectroscopic follow-up of 169 M, L, and T dwarfs. Among the sources discovered are 2 young field brown dwarfs, 6 unusually red M and L dwarfs, 25 unusually blue M and L dwarfs, 2 candidate unresolved L+T binaries, and 24 peculiar UCDs. Additionally, we add 9 L/T transition dwarfs (L6-T4.5) to the already known objects.

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UKIDSS detections of cool brown dwarfs

Cited by 20 publications

References 40 publications

First T dwarfs in the VISTA Hemisphere Survey

First T dwarfs in the VISTA Hemisphere Survey

A Proper Motion Survey Using the First Sky Pass of Neowise-Reactivation Data

A Brown Dwarf Census From the Simp Survey

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