The missing link: Early methane ("T") dwarfs in the Sloan Digital Sky Survey

被引：174

作者：

Leggett, SK

Geballe, TR

Fan, XH

Schneider, DP

Gunn, JE

Lupton, RH

Knapp, GR

Strauss, MA

McDaniel, A

Golimowski, DA

Henry, TJ

Peng, E

Tsvetanov, ZI

Uomoto, A

Zheng, W

Hill, GJ

Ramsey, LW

Anderson, SF

Annis, JA

Bahcall, NA

Brinkmann, J

Chen, B

Csabai, I

Fukugita, M

Hennessy, GS

Hindsley, RB

Ivezic, I

Lamb, DQ

Munn, JA

Pier, JR

Schlegel, DJ

Smith, JA

Stoughton, C

Thakar, AR

York, DG

机构：

[1] United Kingdom Infrared Telescope, Joint Astron Ctr, Hilo, HI 96720 USA

[2] Gemini Observ, Hilo, HI 96720 USA

[3] Princeton Univ Observ, Princeton, NJ 08544 USA

[4] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[5] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[6] Univ Texas, McDonald Observ, Dept Astron, Austin, TX 78712 USA

[7] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[8] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[9] Apache Point Observ, Sunspot, NM 88349 USA

[10] Eotvos Lorand Univ, Dept Phys Complex Syst, H-1117 Budapest, Hungary

[11] Univ Tokyo, Inst Cosm Ray Res, Tokyo 1888502, Japan

[12] Inst Adv Study, Princeton, NJ 08540 USA

[13] USN Observ, Washington, DC 20392 USA

[14] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[15] USN Observ, Flagstaff Stn, Flagstaff, AZ 86002 USA

[16] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 536卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

stars : low-mass; brown dwarfs; surveys;

D O I：

10.1086/312728

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of three cool brown dwarfs that fall in the effective temperature gap between the latest L dwarfs currently known, with no methane absorption bands in the 1-2.5 mu m range, and the previously known methane (T) dwarfs, whose spectra are dominated by methane and water. The newly discovered objects were detected as very red objects in the Sloan Digital Sky Survey imaging data and have JHK colors between the red L dwarfs and the blue Gl 229B-like T dwarfs. They show both CO and CH(4) absorption in their near-infrared spectra in addition to H(2)O(2) with weaker CH(4) absorption features in the H and K bands than those in all other methane dwarfs reported to date. Due to the presence of CH(4) in these bands, we propose that these objects are early T dwarfs. The three form part of the brown dwarf spectral sequence and fill in the large gap in the overall spectral sequence from the hottest main-sequence stars to the coolest methane dwarfs currently known.

引用

页码：L35 / L38

页数：4

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