Seventy-One New L and T Dwarfs from the Sloan Digital Sky Survey

By K. Chiu, X. Fan, S. Leggett, D. Golimowski, Wei Zheng, T. Geballe, D. Schneider, J. Brinkmann. 2006

251 citations recorded by the source corpus.

We present near-infrared observations of 71 newly discovered L and T dwarfs, selected from imaging data of the Sloan Digital Sky Survey (SDSS) using the i-dropout technique. Sixty-five of these dwarfs have been classified spectroscopically according to the near-infrared L dwarf classification scheme of Geballe et al. and the unified T dwarf classification scheme of Burgasser et al. The spectral types of these dwarfs range from L3 to T7 and include the latest types yet found in the SDSS. Six of the newly identified dwarfs are classified as early to mid-L dwarfs according to their photometric near-infrared colors, and two others are classified photometrically as M dwarfs. We also present new near-infrared spectra for five previously published SDSS L and T dwarfs, and one L dwarf and one T dwarf discovered by Burgasser et al. from the Two Micron All Sky Survey. The new SDSS sample includes 27 T dwarfs and 30 dwarfs with spectral types spanning the complex L-T transition (L7-T3). We continue to see a large (∼0.5 mag) spread in J - H for L3-T1 types and a similar spread in H - K for all dwarfs later than L3. This color dispersion is probably due to a range of grain sedimentation properties, metallicity, and gravity. We also find L and T dwarfs with unusual colors and spectral properties that may eventually help to disentangle these effects.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/fd8f443317b35755bd549682dc2f837e7ab4865a

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In Astronomy and Astrophysics

1. Michael C. Liu
2. A. Burgasser
3. T. Dupuy
4. J. D. Kirkpatrick
5. Kelle Cruz
6. M. Marley
7. K. Luhman
8. K. Allers

In Instrumentation

1. Michael C. Liu
2. A. Burgasser
3. T. Dupuy
4. J. D. Kirkpatrick
5. Kelle Cruz
6. K. Allers
7. K. Luhman
8. M. Marley

Citations in the corpus

• BANYAN. VII. A NEW POPULATION OF YOUNG SUBSTELLAR CANDIDATE MEMBERS OF NEARBY MOVING GROUPS FROM THE BASS SURVEY (2015, methodology): “The NIR spectrum obtained by Chiu et al. (2006) is available in the SpeX PRISM Spectral Libraries, we thus retrieved it to assess whether it is a low-gravity dwarf.”
• THE HAWAII INFRARED PARALLAX PROGRAM. I. ULTRACOOL BINARIES AND THE L/T TRANSITION, (2012, methodology): “…et al. (2009); (14) Burningham et al. (2008); (15) Burningham et al. (2009); (16) Burningham et al. (2010); (17) Chauvin et al. – 125 – (2004); (18) Chiu et al. (2006); (19) Costa et al. (2005); (20) Costa et al. (2006); (21) Crifo et al. (2005); (22) Cruz et al. (2003); (23) Cruz et al.…”
• THE 0.8–14.5 μm SPECTRA OF MID-L TO MID-T DWARFS: DIAGNOSTICS OF EFFECTIVE TEMPERATURE, GRAIN SEDIMENTATION, GAS TRANSPORT, AND SURFACE GRAVITY (2009, methodology): “The J − K colors given in Tables 1 and 2 are taken from the MKO photometry – 7 – presented by Leggett et al. (2002), Knapp et al. (2004) and Chiu et al. (2006), except for that of DENIS-P J0255−47.”
• Individual Dynamical Masses of Ultracool Dwarfs (2017, unknown): “— Burg03b = Burgasser et al. (2003b); Burg06b = Burgasser et al. (2006b); Burg11 = Burgasser et al. (2011); Chiu06 = Chiu et al. (2006); Clos03 = Close et al. (2003); Cutr03 = Cutri et al. (2003); Dupu09a = Dupuy et al. (2009a); Dupu09b = Dupuy et al. (2009b); Dupu09c = Dupuy et al. (2009c); Dupu10…”
• Subtle Signatures of Multiplicity in Late-type Dwarf Spectra: The Unresolved M8.5 + T5 Binary 2MASS J03202839–0446358 (2008, background): “Such discrepancies have been variously attributed to surface gravity, metallicity, condensate cloud or multiplicity effects (e.g., Knapp et al. 2004; Chiu et al. 2006; Cruz et al. 2007; Folkes et al. 2007; Burgasser et al. 2008).”
• CLOUDS AND CHEMISTRY IN THE ATMOSPHERE OF EXTRASOLAR PLANET HR8799b (2011, unknown): “5 ±1 (Chiu et al. 2006; Burgasser et al. 2006) and T1.”
• DISCOVERIES FROM A NEAR-INFRARED PROPER MOTION SURVEY USING MULTI-EPOCH TWO MICRON ALL-SKY SURVEY DATA (2010, methodology): “Specifically, spectral indices measuring the depth of H2O bands versus those measuring FeH or K I give discordant spectral types, with the H2O-based index always suggesting a much later L subclass (Knapp et al. 2004; Chiu et al. 2006).”
• COLORS AND KINEMATICS OF L DWARFS FROM THE SLOAN DIGITAL SKY SURVEY (2010, background): “Both the z−KS and J −KS color redden until mid-L types, then turn over and become more blue into the late-T (H02; Knapp et al. 2004; Chiu et al. 2006; Faherty et al. 2009).”
• A STUDY OF THE DIVERSE T DWARF POPULATION REVEALED BY WISE (2013, unknown): “5 ± 1 (Chiu et al. 2006) and T1.”
• Discovery of 11 New T Dwarfs in the Two Micron All Sky Survey, Including a Possible L/T Transition Binary (2007, unknown): “5, Chiu et al. 2006), SDSS 1758+46 (T6.”
• Binaries and the L Dwarf/T Dwarf Transition (2006, background): “However, a robust classification scheme for L dwarfs in the near-infrared is still lacking, which can lead to problems particularly at the L/T transition (Chiu et al. 2006).”
• Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field (2006, background): “Knapp et al. (2004) and Chiu et al. (2006) suggest this scenario for seven blue L dwarfs identified in the Sloan Digital Sky Survey.”
• Low-Mass Dwarf Template Spectra from the Sloan Digital Sky Survey (2006, background): “…concerning low-mass dwarfs, particularly the colors of the M star sequence (Walkowicz et al. 2004; West et al. 2005) and the study of L and T spectral types (Strauss et al. 1999; Fan et al. 2000; Leggett et al. 2000; Tsvetanov et al. 2000; Hawley et al. 2002; Knapp et al. 2004; Chiu et al. 2006).”
• MASSES, RADII, AND CLOUD PROPERTIES OF THE HR 8799 PLANETS (2012, unknown): “01+305344.4 (Chiu et al. 2006; hereafter SDSS 1516+30).”
• ON THE STELLAR POPULATIONS AND EVOLUTION OF STAR-FORMING GALAXIES AT 6.3 < z ⩽ 8.6 (2009, background): “Figure 3 shows the synthesized colors of brown–dwarf stars (us- ing spectra of brown dwarfs from S. Leggett6, with the data from Golimowski et al. (2004), Knapp et al. (2004) and Chiu et al. (2006)).”
• THE HAWAII INFRARED PARALLAX PROGRAM. II. YOUNG ULTRACOOL FIELD DWARFS (2016, background): “…ever lower masses and temperatures, in large part thanks to wide-area digital sky surveys sensitive to such cool objects (e.g. Delfosse et al. 1999; Kirkpatrick et al. 1999; Chiu et al. 2006; Burningham et al. 2010; Reylé et al. 2010; Liu et al. 2011b; Kirkpatrick et al. 2011; Best et al. 2015).”
• MID-INFRARED PHOTOMETRY OF COLD BROWN DWARFS: DIVERSITY IN AGE, MASS, AND METALLICITY (2010, methodology): “…Becklin & Zuckerman (1988); Bidelman (1985); Burgasser et al. (1999, 2000a, 2000b, 2002, 2003b, 2004b, 2006b); Burningham et al. (2008, 2009, 2010); Chiu et al. (2006, 2008); Cruz et al. (2003); Dahn et al. (2002); Delfosse et al. (1997); Delorme et al. (2008a); Fan et al. (2000); Geballe et al.…”