Parallaxes and physical properties of 11 mid-to-late T dwarfs

Marocco, F.; Smart, R. L.; Jones, H. R. A.; Burningham, B.; Lattanzi, M. G.; Leggett, S. K.; Lucas, P. W.; Tinney, C. G.; Adamson, A. J.; Evans, D. W.; Lodieu, N.; Murray, D. N.; Pinfield, D. J.; Tamura, Motohide

doi:10.1051/0004-6361/201015394

Cited by 66 publications

(67 citation statements)

References 43 publications

(73 reference statements)

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“…The dispersion for these relations range from 0.27 (K-band) to 0.3 (J-band). Earlier relations can be found in Dahn et al (2002), Tinney et al (2003) Vrba et al (2004, Liu et al (2006), Marocco et al (2010), Kirkpatrick et al (2012), and Dupuy & Lui (2012). We should point out that the parallax of 2MASSI J0415195−093506 (Vrba et al 2004) is best reproduced by the relations in Faherty et al (2012), with the Marocco et al (2010) relations producing a result that is 6.3% too low.…”

Section: Spectroscopic Distancesmentioning

confidence: 60%

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: Spectroscopic Distancesmentioning

confidence: 60%

First T dwarfs in the VISTA Hemisphere Survey

Lodieu

Burningham

Day-Jones

et al. 2012

A&A

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“…Using the relationship between spectral types and absolute JHK magnitudes determined by Marocco et al (2010) from L0-T9 dwarfs with known trigonometric parallaxes (excluding known and possible binaries), we obtain M J = 14.70, M H = 14.92, M K = 14.99 for T5.5 and M J = 14.92, M H = 15.22, M K = 15.32 for T6 dwarfs. Assuming conservatively absolute magnitude uncertainties of about ± 0.4 mag, involving our ±0.5 sub-type classification, we obtain spectroscopic distances of 25 ± 5 pc, 31 ± 6 pc, and 27 ± 6 pc for ULAS J0954+0623, ULAS J1152+0359, and ULAS J1204−0150, respectively.…”

Section: Spectroscopic Observations With Lbt/lucifermentioning

confidence: 99%

UKIDSS detections of cool brown dwarfs

Scholz

Bihain

Schnurr

et al. 2012

A&A

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Aims. We contribute to improving the census of cool brown dwarfs (late-T and Y dwarfs) in the immediate solar neighbourhood. Methods. By combining near-infrared (NIR) data of UKIDSS with mid-infrared WISE and other available NIR (2MASS) and red optical (SDSS z-band) multi-epoch data we detected high proper motion (HPM) objects with colours typical of late spectral types (>T5). We used NIR low-resolution spectroscopy for the classification of new candidates. Results. We determined new proper motions for 14 known T5.5-Y0 dwarfs, many of which are significantly (>2-10 times) more accurate than previous ones. We detected three new candidates, ULAS J0954+0623, ULAS J1152+0359, and ULAS J1204−0150, by their HPMs and colours. Using previously published and new UKIDSS positions of the known nearby T8 dwarf WISE J0254+0223 we improved its trigonometric parallax to 165 ± 20 mas. For the three new objects we obtained NIR spectroscopic follow-up with LBT/LUCIFER classifying them as T5.5 and T6 dwarfs. With their estimated spectroscopic distances of about 25-30 pc, their proper motions of about 430-650 mas/yr lead to tangential velocities of about 50-80 km s −1 , typical of the Galactic thin-disk population.

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“…Gelino et al 2011, supplemented by data from Marocco et al 2010;Liu et al 2011;Luhman et al 2011, andSubasavage et al 2009) are overplotted as red crosses.…”

Section: Selection Of Candidates and Cross-identificationmentioning

confidence: 99%

Two very nearby (d ~ 5 pc) ultracool brown dwarfs detected by their large proper motions from WISE, 2MASS, and SDSS data

Scholz

Bihain

Schnurr

et al. 2011

A&A

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Aims. WISE provides an infrared all-sky survey that aims at completing our knowledge on the possibly dramatically increasing number of brown dwarfs with lower temperatures. We search for the nearest representatives of the coolest brown dwarfs, which will be very interesting for detailed follow-up observations, once they have been discovered. Methods. We used the preliminary data release from WISE, then selected bright candidates with colours typical of late-T dwarfs, and tried to match them with faint 2MASS and SDSS objects, to determine their proper motions, and to follow them up spectroscopically. Results. We have identified two new ultracool brown dwarfs with large proper motions, WISE J0254+0223 (2.5 arcsec/yr) and WISE J1741+2553 (1.5 arcsec/yr). With their w1−w2 ∼ 3.0 and J−w2 ∼ 4.0 colour indices, we expect both to have spectral types of ∼T8-T10 and absolute magnitude of M w2 ∼ 14. We confirm WISE J1741+2553 as a T9-T10 dwarf from near-infrared spectroscopy with LBT/LUCIFER1. From their bright WISE w2 magnitudes of 12.7 and 12.3, we estimate distances of 5.5 +2.3 −1.6 pc and 4.6 +1.2 −1.0 pc and tangential velocities of ∼65 km s −1 and ∼34 km s −1 that indicate Galactic thick and thin disk membership, respectively.

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Parallaxes and physical properties of 11 mid-to-late T dwarfs

Cited by 66 publications

References 43 publications

First T dwarfs in the VISTA Hemisphere Survey

First T dwarfs in the VISTA Hemisphere Survey

UKIDSS detections of cool brown dwarfs

Two very nearby (d ~ 5 pc) ultracool brown dwarfs detected by their large proper motions from WISE, 2MASS, and SDSS data

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