2011A&A...532L...5S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST00:22:40

2011A&A...532L...5S - Astronomy and Astrophysics, volume 532, L5-5 (2011/8-1)

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

SCHOLZ R.-D., BIHAIN G., SCHNURR O. and STORM J.

Abstract (from CDS):

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. 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. We have identified two new ultracool brown dwarfs with large proper motions, WISE J0254+0223 (2.5arcsec/yr) and WISE J1741+2553 (1.5arcsec/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 Mw2∼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+2.3–1.6pc and 4.6+1.2–1.0pc and tangential velocities of ∼65km/s and ∼34km/s that indicate Galactic thick and thin disk membership, respectively.

Abstract Copyright:

Journal keyword(s): astrometry - proper motions - stars: distances - stars: kinematics and dynamics - brown dwarfs - solar neighborhood

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2MASS J02540788+0223563 BD* 02 54 07.88640 +02 23 56.3460           T8.0 23 0
2 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 147 0
3 UGPS J072227.51-054031.2 BD* 07 22 27.51096 -05 40 31.2096           T9 62 0
4 2MASSI J0727182+171001 BD* 07 27 18.24600 +17 10 01.2072           T7.0 75 0
5 2MASS J07290002-3954043 BD* 07 29 00.02496 -39 54 04.3992           T8pec 24 0
6 L 97-3 B BD* 08 07 14.675 -66 18 48.68           Y1 53 0
7 ULAS J130041.74+122114.7 BD* 13 00 42.08415 +12 21 15.0536         23.28 T8.5p 100 0
8 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 194 1
9 WISEP J174124.25+255319.5 BD* 17 41 24.62064 +25 53 34.3608           T9 21 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-00:22:40

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