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Article: Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base

TitleDiscovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base
Authors
KeywordsSolar Neighbourhood
Stars: Low-Mass, Brown Dwarfs
Stars: Luminosity Function, Mass Function
Techniques: Photometric
Techniques: Spectroscopic
Issue Date2008
PublisherBlackwell 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?
AbstractWe 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 Identifierhttp://hdl.handle.net/10722/175107
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorPhanBao, Nen_US
dc.contributor.authorBessell, MSen_US
dc.contributor.authorMartín, ELen_US
dc.contributor.authorSimon, Gen_US
dc.contributor.authorBorsenberger, Jen_US
dc.contributor.authorTata, Ren_US
dc.contributor.authorGuibert, Jen_US
dc.contributor.authorCrifo, Fen_US
dc.contributor.authorForveille, Ten_US
dc.contributor.authorDelfosse, Xen_US
dc.contributor.authorLim, Jen_US
dc.contributor.authorDe Batz, Ben_US
dc.date.accessioned2012-11-26T08:49:15Z-
dc.date.available2012-11-26T08:49:15Z-
dc.date.issued2008en_US
dc.identifier.citationMonthly Notices Of The Royal Astronomical Society, 2008, v. 383 n. 3, p. 831-844en_US
dc.identifier.issn0035-8711en_US
dc.identifier.urihttp://hdl.handle.net/10722/175107-
dc.description.abstractWe 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.languageengen_US
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNRen_US
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen_US
dc.subjectSolar Neighbourhooden_US
dc.subjectStars: Low-Mass, Brown Dwarfsen_US
dc.subjectStars: Luminosity Function, Mass Functionen_US
dc.subjectTechniques: Photometricen_US
dc.subjectTechniques: Spectroscopicen_US
dc.titleDiscovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data baseen_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1111/j.1365-2966.2007.12564.xen_US
dc.identifier.scopuseid_2-s2.0-38949125099en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-38949125099&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume383en_US
dc.identifier.issue3en_US
dc.identifier.spage831en_US
dc.identifier.epage844en_US
dc.identifier.isiWOS:000252851500002-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridPhanBao, N=8719607900en_US
dc.identifier.scopusauthoridBessell, MS=7003934158en_US
dc.identifier.scopusauthoridMartín, EL=7404092339en_US
dc.identifier.scopusauthoridSimon, G=7403272675en_US
dc.identifier.scopusauthoridBorsenberger, J=6603484827en_US
dc.identifier.scopusauthoridTata, R=14523739000en_US
dc.identifier.scopusauthoridGuibert, J=7103331539en_US
dc.identifier.scopusauthoridCrifo, F=6602093030en_US
dc.identifier.scopusauthoridForveille, T=7003444714en_US
dc.identifier.scopusauthoridDelfosse, X=6701872272en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US
dc.identifier.scopusauthoridDe Batz, B=6602216038en_US

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