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- Publisher Website: 10.1111/j.1365-2966.2007.12564.x
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Article: Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base
Title | Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base |
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Authors | |
Keywords | Solar Neighbourhood Stars: Low-Mass, Brown Dwarfs Stars: Luminosity Function, Mass Function Techniques: Photometric Techniques: Spectroscopic |
Issue Date | 2008 |
Publisher | Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNR |
Citation | Monthly Notices Of The Royal Astronomical Society, 2008, v. 383 n. 3, p. 831-844 How to Cite? |
Abstract | We report on new nearby L and late-M dwarfs (dphot ≤ 30 pc) discovered in our search for nearby ultracool dwarfs (I-J ≥ 3.0, later than M8.0) at low Galactic latitude (|b| < 15°) over 4800 deg2 in the Deep Near Infrared Survey of the Southern Sky (DENIS) data base. We used late-M (≥ M8.0), L and T dwarfs with accurate trigonometric parallaxes to calibrate the MJ versus I-J colour-luminosity relation. The resulting photometric distances have standard errors of ∼15 per cent, which we used to select candidates dphot ≤ 30 pc. We measured proper motions from multi-epoch images found in the public archives ALADIN, DSS, 2MASS and DENIS, with at least three distinct epochs and time baselines of 10-21 yr. We then used a maximum reduced proper motion cut-off to select 28 candidates as ultracool dwarfs (M8.0-L8.0) and to reject one as a distant red star. No T dwarf candidates were found in this search, which required an object to be detected in all three DENIS bands. Our low-resolution optical spectra confirmed that 26 were indeed ultracool dwarfs, with spectral types from M8.0 to L5.5. Two contaminants and one rejected by the maximum reduced proper motion cut-off were all reddened F-K main sequence stars. 20 of these 26 ultracool dwarfs are new nearby ultracool dwarf members, three L dwarfs within 15 pc with one L3.5 at only ∼10 pc. We determine a stellar density of dwarfs pc-3 mag-1 over 11.1 ≤ MJ ≤ 13.1 based on this sample of M8-L3.5 ultracool dwarfs. Our ultracool dwarf density value is in good agreement with the measurement by Cruz et al. of the ultracool dwarf density at high Galactic latitude. © 2007 RAS. |
Persistent Identifier | http://hdl.handle.net/10722/175107 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | PhanBao, N | en_US |
dc.contributor.author | Bessell, MS | en_US |
dc.contributor.author | Martín, EL | en_US |
dc.contributor.author | Simon, G | en_US |
dc.contributor.author | Borsenberger, J | en_US |
dc.contributor.author | Tata, R | en_US |
dc.contributor.author | Guibert, J | en_US |
dc.contributor.author | Crifo, F | en_US |
dc.contributor.author | Forveille, T | en_US |
dc.contributor.author | Delfosse, X | en_US |
dc.contributor.author | Lim, J | en_US |
dc.contributor.author | De Batz, B | en_US |
dc.date.accessioned | 2012-11-26T08:49:15Z | - |
dc.date.available | 2012-11-26T08:49:15Z | - |
dc.date.issued | 2008 | en_US |
dc.identifier.citation | Monthly Notices Of The Royal Astronomical Society, 2008, v. 383 n. 3, p. 831-844 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/175107 | - |
dc.description.abstract | We report on new nearby L and late-M dwarfs (dphot ≤ 30 pc) discovered in our search for nearby ultracool dwarfs (I-J ≥ 3.0, later than M8.0) at low Galactic latitude (|b| < 15°) over 4800 deg2 in the Deep Near Infrared Survey of the Southern Sky (DENIS) data base. We used late-M (≥ M8.0), L and T dwarfs with accurate trigonometric parallaxes to calibrate the MJ versus I-J colour-luminosity relation. The resulting photometric distances have standard errors of ∼15 per cent, which we used to select candidates dphot ≤ 30 pc. We measured proper motions from multi-epoch images found in the public archives ALADIN, DSS, 2MASS and DENIS, with at least three distinct epochs and time baselines of 10-21 yr. We then used a maximum reduced proper motion cut-off to select 28 candidates as ultracool dwarfs (M8.0-L8.0) and to reject one as a distant red star. No T dwarf candidates were found in this search, which required an object to be detected in all three DENIS bands. Our low-resolution optical spectra confirmed that 26 were indeed ultracool dwarfs, with spectral types from M8.0 to L5.5. Two contaminants and one rejected by the maximum reduced proper motion cut-off were all reddened F-K main sequence stars. 20 of these 26 ultracool dwarfs are new nearby ultracool dwarf members, three L dwarfs within 15 pc with one L3.5 at only ∼10 pc. We determine a stellar density of dwarfs pc-3 mag-1 over 11.1 ≤ MJ ≤ 13.1 based on this sample of M8-L3.5 ultracool dwarfs. Our ultracool dwarf density value is in good agreement with the measurement by Cruz et al. of the ultracool dwarf density at high Galactic latitude. © 2007 RAS. | en_US |
dc.language | eng | en_US |
dc.publisher | Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNR | en_US |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | en_US |
dc.subject | Solar Neighbourhood | en_US |
dc.subject | Stars: Low-Mass, Brown Dwarfs | en_US |
dc.subject | Stars: Luminosity Function, Mass Function | en_US |
dc.subject | Techniques: Photometric | en_US |
dc.subject | Techniques: Spectroscopic | en_US |
dc.title | Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base | en_US |
dc.type | Article | en_US |
dc.identifier.email | Lim, J: jjlim@hku.hk | en_US |
dc.identifier.authority | Lim, J=rp00745 | en_US |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1111/j.1365-2966.2007.12564.x | en_US |
dc.identifier.scopus | eid_2-s2.0-38949125099 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-38949125099&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 383 | en_US |
dc.identifier.issue | 3 | en_US |
dc.identifier.spage | 831 | en_US |
dc.identifier.epage | 844 | en_US |
dc.identifier.isi | WOS:000252851500002 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | PhanBao, N=8719607900 | en_US |
dc.identifier.scopusauthorid | Bessell, MS=7003934158 | en_US |
dc.identifier.scopusauthorid | Martín, EL=7404092339 | en_US |
dc.identifier.scopusauthorid | Simon, G=7403272675 | en_US |
dc.identifier.scopusauthorid | Borsenberger, J=6603484827 | en_US |
dc.identifier.scopusauthorid | Tata, R=14523739000 | en_US |
dc.identifier.scopusauthorid | Guibert, J=7103331539 | en_US |
dc.identifier.scopusauthorid | Crifo, F=6602093030 | en_US |
dc.identifier.scopusauthorid | Forveille, T=7003444714 | en_US |
dc.identifier.scopusauthorid | Delfosse, X=6701872272 | en_US |
dc.identifier.scopusauthorid | Lim, J=7403453870 | en_US |
dc.identifier.scopusauthorid | De Batz, B=6602216038 | en_US |
dc.identifier.issnl | 0035-8711 | - |