DISCOVERY of YOUNG METHANE DWARFS in the RHO OPHIUCHI L 1688 DARK CLOUD

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題名:	DISCOVERY of YOUNG METHANE DWARFS in the RHO OPHIUCHI L 1688 DARK CLOUD
作者:	陳文屏;Chiang, Poshih;Chen, W. P.
貢獻者:	理學院天文研究所
關鍵詞:	Band spectra;brown dwarfs;Clouds;Gravitation;Infrared;infrared: stars;Methane;Spectra;Spectroscopy;Star formation;stars: formation;stars: individual (Oph J162738-245240, Oph J162645-241949, Oph J162651-242110)
日期:	2015-10-01
上傳時間:	2026-04-21 14:38:57 (UTC+8)
出版者:	IOP Publishing Ltd.;The American Astronomical Society
摘要:	摘要： ABSTRACT We report the discovery of two methane dwarfs in the dark cloud L 1688 of the Oph star-forming region. The two objects were among the T dwarf candidates with possible methane absorption and cool atmospheres, as diagnosed by infrared colors using deep Wide-field InfraRed Camera/Canada-France-Hawaii Telescope HK plus CH4ON images, and IRAC/Spitzer c2d data. Follow-up spectroscopic observations with the FLAMINGOS-2/Gemini South confirmed the methane absorption at 1.6 m. Compared with spectral templates of known T dwarfs in the field, i.e., of the old populations, Oph J162738−245240 (Oph-T3) is a T0/T1 type, whereas Oph J162645−241949 (Oph-T17) is consistent with a T3/T4 type in the H band but an L8/T1 in the K band. Compared with the BT-Settl model, both Oph-T3 and Oph-T17 are consistent with being cool, ∼1000 K and ∼900 K, respectively, and of low surface gravity, With an age no more than a couple Myr, these two methane dwarfs thereby represent the youngest T dwarfs ever confirmed. A young late L dwarf, Oph J162651−242110, was found serendipitously in our spectroscopic observations. 其他題名： APJL 其他題名： Astrophys. J. Lett 出版者： The American Astronomical Society 出版日期： 2015-10-01 出處： Astrophysical journal. Letters, 2015-10, Vol.811 (2), p.L16-7 資源來源： Institute of Physics Journals 版權： 2015. The American Astronomical Society. All rights reserved. 識別號： ISSN: 2041-8205 識別號： ISSN: 2041-8213 識別號： EISSN: 2041-8213 識別號： DOI: 10.1088/2041-8205/811/2/L16
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