Fire Spectroscopy of Five Late-Type T Dwarfs Discovered With the Wide-Field Infrared Survey Explorer

Burgasser, Adam J.; Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Griffith, R. L.; Looper, Dagny L.; Tinney, C. G.; Simcoe, Robert A.; Bochanski, John J.; Skrutskie, Michael F.; Mainzer, Amy; Thompson, Maggie; Marsh, K. A.; Bauer, J. M.; Wright, E. L.

doi:10.1088/0004-637x/735/2/116

Cited by 40 publications

(55 citation statements)

References 107 publications

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“…Wolf 940B is estimated as an object of intermediate gravity and age (Leggett et al 2010b). However, Burgasser et al (2011) derive a different mass and age for WISE 1812+2721 that is very similar to WISE 1617+1807. These differences underscore the difficulties and inconsistencies in constraining solivagant brown dwarf properties with atmospheric models alone.…”

Section: Identifying T Dwarfs With Color Indices Similar To Wise 2005mentioning

confidence: 79%

The Exemplar T8 Subdwarf Companion of Wolf 1130

Mace

Kirkpatrick

Cushing

et al. 2013

ApJ

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We have discovered a wide separation (188. 5) T8 subdwarf companion to the sdM1.5+WD binary Wolf 1130. Companionship of WISE J200520.38+542433.9 is verified through common proper motion over a ∼3 yr baseline. Wolf 1130 is located 15.83 ± 0.96 pc from the Sun, placing the brown dwarf at a projected separation of ∼3000 AU. Near-infrared colors and medium resolution (R ≈ 2000-4000) spectroscopy establish the uniqueness of this system as a high-gravity, low-metallicity benchmark. Although there are a number of low-metallicity T dwarfs in the literature, WISE J200520.38+542433.9 has the most extreme inferred metallicity to date with [Fe/H] = −0.64 ± 0.17 based on Wolf 1130. Model comparisons to this exemplar late-type subdwarf support it having an old age, a low metallicity, and a small radius. However, the spectroscopic peculiarities of WISE J200520.38+542433.9 underscore the importance of developing the low-metallicity parameter space of the most current atmospheric models.

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Section: Identifying T Dwarfs With Color Indices Similar To Wise 2005mentioning

confidence: 79%

The Exemplar T8 Subdwarf Companion of Wolf 1130

Mace

Kirkpatrick

Cushing

et al. 2013

ApJ

Self Cite

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“…Colour-colour diagram of our six candidates (black full circles) compared with a sample of known L and T dwarfs (triangles and circles, respectively) observed with WISE (Mainzer et al 2011;Scholz et al 2011;Burgasser et al 2011. ) our candidate BDs) and the lack of 2MASS K s photometry for two of them are the main reasons for their omission in previous 2MASS/SDSS-based PM searches.…”

Section: Figmentioning

confidence: 96%

WISE/2MASS-SDSS brown dwarfs candidates using Virtual Observatory tools

Aberasturi

Solano

Martín

2011

A&A

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Context. Massive far-red and infrared imaging surveys in different bandpasses are the main contributors to the discovery of brown dwarfs (BDs). The Virtual Observatory (VO) represents an adequate framework to handle these vast datasets efficiently and filter them out according to specific requirements. A statistically significant number of BDs is mandatory for understanding their general properties better for identifing peculiar objects. WISE, an all-sky survey in the mid-infrared, provides an excellent opportunity to increase the number of BDs significantly, in particular those at the lower end of the temperature scale. Aims. We aim to demonstrate that VO tools are efficient in identifing and characterizing BDs by cross-correlating public catalogues released by large surveys. Methods. Using VO tools we performed a cross-match of the WISE Preliminary Release, the 2MASS Point Source and the SDSS Data Release 7 catalogues over the whole area of sky that they have in common (∼4000 deg 2 ). Photometric and proper motion criteria were used to obtain a list of BD candidates. A temperature estimate is provided for each candidate based on their spectral energy distribution using VOSA, a VO tool for spectral energy distribution (SED) fitting. We derive the spectral types from the effective temperatures. Distances, calculated from the absolute magnitude-spectral type relation, place our candidates at 14-80 pc from the Sun, assuming that they are single. Results. We have identified 31 BD candidates, 25 of which have already been reported in the literature. The remaining six candidates have been classified as L-(four) and T-type (two) objects. The high rate of recovery of known BDs (∼90% of the T dwarfs catalogued in 2MASS) demonstrates the validity of our strategy to identify them with VO tools. An application of this method for a deeper search that covers the whole sky in common to WISE and UKIDSS will be presented in a forthcoming work.

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“…-The colour constraints w1−w2 > 2 and w2−w3 < 2.5 are also applied by Burgasser et al (2011) in search of late-T dwarfs, based on observations with the Large Binocular Telescope (LBT). 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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Fire Spectroscopy of Five Late-Type T Dwarfs Discovered With the Wide-Field Infrared Survey Explorer

Cited by 40 publications

References 107 publications

The Exemplar T8 Subdwarf Companion of Wolf 1130

The Exemplar T8 Subdwarf Companion of Wolf 1130

WISE/2MASS-SDSS brown dwarfs candidates using Virtual Observatory tools

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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