2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF
We present the serendipitous discovery of an L subdwarf in the Two Micron All Sky Survey (2MASS) J06164006–6407194, in a search of the 2MASS for T dwarfs. Its spectrum exhibits features indicative of both a cool and metal poor atmosphere including a heavily pressure-broadened K I resonant doublet, C...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Astronomical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/52700 https://orcid.org/0000-0003-3939-3297 |
| _version_ | 1811082597038555136 |
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| author | Cushing, Michael C. Looper, Dagny L. Burgasser, Adam J. Kirkpatrick, J. Davy Faherty, Jacqueline K. Cruz, Kelle L. Sweet, Anne Sanderson, Robyn Ellyn |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Cushing, Michael C. Looper, Dagny L. Burgasser, Adam J. Kirkpatrick, J. Davy Faherty, Jacqueline K. Cruz, Kelle L. Sweet, Anne Sanderson, Robyn Ellyn |
| author_sort | Cushing, Michael C. |
| collection | MIT |
| description | We present the serendipitous discovery of an L subdwarf in the Two Micron All Sky Survey (2MASS) J06164006–6407194, in a search of the 2MASS for T dwarfs. Its spectrum exhibits features indicative of both a cool and metal poor atmosphere including a heavily pressure-broadened K I resonant doublet, Cs I and Rb I lines, molecular bands of CaH, TiO, CrH, FeH, and H[subscript 2]O, and enhanced collision induced absorption of H[subscript 2]. We assign 2MASS J0616–6407 a spectral type of sdL5 based on a comparison of its red optical spectrum to that of near solar-metallicity L dwarfs. Its high proper motion (μ = 1farcs405 ± 0.008 yr[superscript –1]), large radial velocity (V rad = 454 ± 15 km s[superscript –1]), estimated u, v, w velocities (94, –573, 125) km s[superscript –1] and Galactic orbit with an apogalacticon at ~29 kpc are indicative of membership in the outer halo making 2MASS J0616–6407 the first ultracool member of this population. |
| first_indexed | 2024-09-23T12:05:55Z |
| format | Article |
| id | mit-1721.1/52700 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:05:55Z |
| publishDate | 2010 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/527002022-10-01T08:07:43Z 2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF Cushing, Michael C. Looper, Dagny L. Burgasser, Adam J. Kirkpatrick, J. Davy Faherty, Jacqueline K. Cruz, Kelle L. Sweet, Anne Sanderson, Robyn Ellyn Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Burgasser, Adam J. Burgasser, Adam J. Sanderson, Robyn Ellyn We present the serendipitous discovery of an L subdwarf in the Two Micron All Sky Survey (2MASS) J06164006–6407194, in a search of the 2MASS for T dwarfs. Its spectrum exhibits features indicative of both a cool and metal poor atmosphere including a heavily pressure-broadened K I resonant doublet, Cs I and Rb I lines, molecular bands of CaH, TiO, CrH, FeH, and H[subscript 2]O, and enhanced collision induced absorption of H[subscript 2]. We assign 2MASS J0616–6407 a spectral type of sdL5 based on a comparison of its red optical spectrum to that of near solar-metallicity L dwarfs. Its high proper motion (μ = 1farcs405 ± 0.008 yr[superscript –1]), large radial velocity (V rad = 454 ± 15 km s[superscript –1]), estimated u, v, w velocities (94, –573, 125) km s[superscript –1] and Galactic orbit with an apogalacticon at ~29 kpc are indicative of membership in the outer halo making 2MASS J0616–6407 the first ultracool member of this population. 2010-03-18T13:23:55Z 2010-03-18T13:23:55Z 2009-04 2009-01 Article http://purl.org/eprint/type/SubmittedJournalArticle 0004-637X arXiv:0902.1059v1 http://hdl.handle.net/1721.1/52700 Cushing, Michael C. et al "2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF." The Astrophysical Journal 696.1 (2009): 986. https://orcid.org/0000-0003-3939-3297 en_US http://dx.doi.org/10.1088/0004-637x/696/1/986 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Astronomical Society author/dept web page |
| spellingShingle | Cushing, Michael C. Looper, Dagny L. Burgasser, Adam J. Kirkpatrick, J. Davy Faherty, Jacqueline K. Cruz, Kelle L. Sweet, Anne Sanderson, Robyn Ellyn 2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF |
| title | 2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF |
| title_full | 2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF |
| title_fullStr | 2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF |
| title_full_unstemmed | 2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF |
| title_short | 2MASS J06164006-6407194: THE FIRST OUTER HALO L SUBDWARF |
| title_sort | 2mass j06164006 6407194 the first outer halo l subdwarf |
| url | http://hdl.handle.net/1721.1/52700 https://orcid.org/0000-0003-3939-3297 |
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