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Titolo:
The missing link: Early methane ("T") dwarfs in the Sloan Digital Sky Survey
Autore:
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;
Indirizzi:
United Kingdom Infrared Telescope, Joint Astron Ctr, Hilo, HI 96720 USA United Kingdom Infrared Telescope Hilo HI USA 96720 r, Hilo, HI 96720 USA Gemini Observ, Hilo, HI 96720 USA Gemini Observ Hilo HI USA 96720Gemini Observ, Hilo, HI 96720 USA Princeton Univ Observ, Princeton, NJ 08544 USA Princeton Univ Observ Princeton NJ USA 08544 erv, Princeton, NJ 08544 USA Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA PennState Univ University Pk PA USA 16802 s, University Pk, PA 16802 USA Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA Johns Hopkins Univ Baltimore MD USA 21218 Astron, Baltimore, MD 21218 USA Univ Texas, McDonald Observ, Dept Astron, Austin, TX 78712 USA Univ TexasAustin TX USA 78712 Observ, Dept Astron, Austin, TX 78712 USA Univ Washington, Dept Astron, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 , Dept Astron, Seattle, WA 98195 USA Fermi Natl Accelerator Lab, Batavia, IL 60510 USA Fermi Natl Accelerator Lab Batavia IL USA 60510 ab, Batavia, IL 60510 USA Apache Point Observ, Sunspot, NM 88349 USA Apache Point Observ Sunspot NMUSA 88349 nt Observ, Sunspot, NM 88349 USA Lorand Eotvos Univ, Dept Phys Complex Syst, H-1117 Budapest, Hungary Lorand Eotvos Univ Budapest Hungary H-1117 yst, H-1117 Budapest, Hungary Univ Tokyo, Inst Cosm Ray Res, Tokyo 1888502, Japan Univ Tokyo Tokyo Japan 1888502 , Inst Cosm Ray Res, Tokyo 1888502, Japan Inst Adv Study, Princeton, NJ 08540 USA Inst Adv Study Princeton NJ USA 08540 Adv Study, Princeton, NJ 08540 USA USN Observ, Washington, DC 20392 USA USN Observ Washington DC USA 20392USN Observ, Washington, DC 20392 USA Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA Univ ChicagoChicago IL USA 60637 tron & Astrophys, Chicago, IL 60637 USA USN Observ, Flagstaff Stn, Flagstaff, AZ 86002 USA USN Observ Flagstaff AZ USA 86002 Flagstaff Stn, Flagstaff, AZ 86002 USA Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA Univ Michigan Ann ArborMI USA 48109 , Dept Phys, Ann Arbor, MI 48109 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 1, volume: 536, anno: 2000,
parte:, 2
pagine: L35 - L38
SICI:
0004-637X(20000610)536:1<L35:TMLEM(>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
HOBBY-EBERLY TELESCOPE; LOW-RESOLUTION SPECTROGRAPH; BROWN DWARF; DISCOVERY; PLANETS; SYSTEM;
Keywords:
stars : low-mass; brown dwarfs; surveys;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Leggett, SK United Kingdom Infrared Telescope, Joint Astron Ctr, 660 N Aohoku Pl,Univ Pk, Hilo, HI 96720 USA United Kingdom Infrared Telescope 660 N Aohoku Pl,Univ Pk Hilo HI USA 96720
Citazione:
S.K. Leggett et al., "The missing link: Early methane ("T") dwarfs in the Sloan Digital Sky Survey", ASTROPHYS J, 536(1), 2000, pp. L35-L38

Abstract

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 CH4 absorption in their near-infrared spectra in addition to H2O2 with weaker CH4 absorption features in the H and K bands than those in all other methane dwarfs reported to date. Due to the presence of CH4 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.

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Documento generato il 25/02/18 alle ore 12:41:04