Access to Astronomical Catalogues

← Click to display the menu
J/AJ/134/1162       11 new T dwarfs in 2MASS                 (Looper+, 2007)

Discovery of 11 new T dwarfs in the Two Micron All Sky Survey, including a possible L/T transition binary. Looper D.L., Kirkpatrick J.D., Burgasser A.J. <Astron. J., 134, 1162-1182 (2007)> =2007AJ....134.1162L
ADC_Keywords: Stars, pre-main sequence ; Photometry, infrared Keywords: stars: low-mass, brown dwarfs - techniques: spectroscopic Abstract: We present the discovery of 11 new T dwarfs, found during the course of a photometric survey for mid-to-late T dwarfs in the 2MASS Point Source Catalog and from a proper-motion-selected sample of ultracool dwarfs in the 2MASS Working Database. Using the NASA Infrared Telescope Facility SpeX spectrograph, we obtained low-resolution (R∼150) spectroscopy, allowing us to derive near-infrared spectral types of T2-T8. We also present improved signal-to-noise ratio SpeX low-resolution spectroscopy of the near-infrared T0 standard SDSS J120747.17+024424.8 and T1 standard SDSSp J083717.22-000018.3. One of these new T dwarfs, 2MASS J13243559+6358284, was also discovered independently by Metchev et al. Description: We have carried out a proper-motion survey for ultracool dwarfs using ∼4700deg2 of multiepoch data in the 2MASS Working Database. We conducted follow-up imaging to cull the large number of transients from our 2MASS photometric search sample, using the UH 2.2m ULBCAM and the IRTF 3.0m SpeX cameras. We imaged candidates with ULBCAM on 2006 February 9-12 and 16 UT and July 24 UT. We used SpeX camera to image candidates during 2006 May 31 UT, August 17-18 UT, September 1-2 UT, November 17 UT, and December 8-9 and 20-21 UT. We obtained spectroscopic observations for a total of 20 science targets, 2 T dwarf standards, and 20 calibrator A0 V stars between 2006 April 8 UT and December 21 UT. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 73 50 Transients table4.dat 113 16 Spectrophotometric properties of new and confirmed T dwarfs table9.dat 120 72 T Dwarfs in the Solar Neighborhood (within 25pc) refs.dat 62 33 References
See also: J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002) J/ApJ/564/421 : Spectra of T dwarfs. I. (Burgasser+, 2002) J/AJ/126/2487 : T dwarfs in the southern hemisphere (Burgasser+, 2003) J/AJ/126/3007 : Spectroscopy of faint red NLTT dwarfs (Reid+, 2003) J/AJ/127/3553 : JHK photometry & spectroscopy for L & T dwarfs (Knapp+ 2004) J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006) J/ApJ/637/1067 : T dwarfs near-IR spectral classification (Burgasser+, 2006) J/ApJ/648/629 : Radio observations of late M, L and T dwarfs (Berger+, 2006) J/ApJ/651/502 : Spitzer IRAC photometry of M, L and T dwarfs (Patten+, 2006) J/MNRAS/384/1399 : Proper motions of field L and T dwarfs (Jameson+, 2008) J/MNRAS/390/1517 : Proper motions of field L and T dwarfs (Casewell+, 2008) J/A+A/501/1059 : Infrared spectra of 9 T dwarfs (del Burgo+, 2009) J/A+A/503/639 : NIR spectral of M-T dwarfs (Testi, 2009) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [2MASS] 7- 23 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs) 25- 29 F5.2 mag Jmag 2MASS J magnitude 31- 34 F4.2 mag e_Jmag rms uncertainty on Jmag 36- 40 F5.2 mag Hmag 2MASS H magnitude 42- 45 F4.2 mag e_Hmag rms uncertainty on Hmag 47- 51 F5.2 mag Ksmag 2MASS Ks magnitude 53- 56 F4.2 mag e_Ksmag ? rms uncertainty on Ksmag 58- 67 A10 "YYYY/MM/DD" Obs.Date UT date of 2MASS observation 69- 73 F5.1 deg beta Eliptic latitude
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1 A1 --- f_Name [NR] N=New T Dwarfs, R=Recovered T Dwarfs 3- 27 A25 --- Name 2MASS or SDSS name 28 A1 --- r_Name [d] Reference of recovered T dwarf (1) 30- 34 F5.2 mag Jmag 2MASS J magnitude 36- 39 F4.2 mag e_Jmag rms uncertainty on Jmag 41- 45 F5.2 mag J-H 2MASS J-H colour index 47- 50 F4.2 mag e_J-H rms uncertainty on J-H 52 A1 --- l_H-Ks Limit flag on H-Ks 53- 57 F5.2 mag H-Ks 2MASS H-Ks colour index 59- 62 F4.2 mag e_H-Ks ? rms uncertainty o n H-Ks 64 A1 --- l_J-Ks Limit flag on J-Ks 65- 69 F5.2 mag J-Ks 2MASS J-Ks colour index 71- 74 F4.2 mag e_J-Ks ? rms uncertainty on J-Ks 76- 80 F5.2 mag imag ? SDSS i magnitude 82- 85 F4.2 mag e_imag ? rms uncertainty on imag 87- 91 F5.2 mag zmag ? SDSS z magnitude 93- 96 F4.2 mag e_zmag ? rms uncertainty on zmag 98-103 A6 --- SpT Spectral type 104 A1 --- n_SpT [e] Note on SpT (2) 106-109 F4.1 pc Dist Spectrophotometric distance estimate 111-113 F3.1 pc e_Dist rms uncertainty on Dist
Note (1): References for recovered T Dwarfs: * 2MASS 0939-24 (Tinney et al., 2005AJ....130.2326T) * SDSS 1346-00 (Tsvetanov et al., 2000ApJ...531L..61T) * SDSS 1630+08 (Chiu et al., 2006AJ....131.2722C) * SDSS 1758+46 (Knapp et al., 2004, Cat. J/AJ/127/3553) * SDSS 2124+01 (Knapp et al., 2004, Cat. J/AJ/127/3553) Note (2): From Burgasser et al. (2006, Cat. J/ApJ/637/1067)
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1 I1 --- d [1/2] Distance flag (1=d≤10pc, 2=10<d<25pc) 3- 29 A27 --- Name Name 31 A1 --- n_Name [*] * for new additions reported in this paper 32- 47 A16 --- OName Other name 49- 50 I2 --- Seq Discovery reference 52- 60 A9 --- SpT NIR spectral type 62- 67 F6.3 mag Jmag 2MASS J magnitude 69- 73 F5.2 mag Ksmag ? 2MASS Ks magnitude 74- 75 I2 --- r_Ksmag ? Origin of Ksmag (refs. 2 or 22) 77- 81 F5.2 pc DistJ ?=- Distance from J magnitude 83- 87 F5.2 pc DistPi ?=- Distance from parallax 89 A1 --- l_Dist Limit flag on Dist 90- 93 F4.1 pc Dist Adopted heliocentric distance (2) 95- 97 A3 --- Hres [Yes No] High-resolution imaging? 99-103 A5 -- Ref Reference, in refs.dat file 105-120 A16 --- Rem Remarks
Note (2): Distance adopted from trigonometric parallax if measured.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 41 A18 --- Aut Author's name 43- 62 A20 --- Com Comments
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 03-Oct-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact