Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base
Identifieur interne : 008D84 ( Main/Exploration ); précédent : 008D83; suivant : 008D85Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base
Auteurs : N. Phan-Bao [Taïwan, États-Unis] ; M. S. Bessell [Australie] ; E. L. Martin [États-Unis, Espagne] ; G. Simon [France] ; J. Borsenberger [France] ; R. Tata [États-Unis] ; J. Guibert [France] ; F. Crifo [France] ; T. Forveille [France] ; X. Delfosse [France] ; J. Lim [Taïwan] ; B. De Batz [France]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2008.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
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 ϕJ cor = (1.64 ± 0.46) x 10-3 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.
Affiliations:
- Australie, Espagne, France, Taïwan, États-Unis
- Auvergne-Rhône-Alpes, Rhône-Alpes, Île-de-France
- Grenoble, Paris
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Le document en format XML
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<term>Masse stellaire</term>
<term>Fonction luminosité</term>
<term>Fonction masse</term>
<term>Voisinage solaire</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">We report on new nearby L and late-M dwarfs (d<sub>phot</sub>
≤ 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 deg<sup>2</sup>
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 d<sub>phot</sub>
≤ 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 ϕ<sub>J</sub>
<sub>cor</sub>
= (1.64 ± 0.46) x 10<sup>-3</sup>
dwarfs pc<sup>-3</sup>
mag<sup>-1</sup>
over 11.1 ≤ M<sub>J</sub>
≤ 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.</div>
</front>
</TEI>
<affiliations><list><country><li>Australie</li>
<li>Espagne</li>
<li>France</li>
<li>Taïwan</li>
<li>États-Unis</li>
</country>
<region><li>Auvergne-Rhône-Alpes</li>
<li>Rhône-Alpes</li>
<li>Île-de-France</li>
</region>
<settlement><li>Grenoble</li>
<li>Paris</li>
</settlement>
</list>
<tree><country name="Taïwan"><noRegion><name sortKey="Phan Bao, N" sort="Phan Bao, N" uniqKey="Phan Bao N" first="N." last="Phan-Bao">N. Phan-Bao</name>
</noRegion>
<name sortKey="Lim, J" sort="Lim, J" uniqKey="Lim J" first="J." last="Lim">J. Lim</name>
</country>
<country name="États-Unis"><noRegion><name sortKey="Phan Bao, N" sort="Phan Bao, N" uniqKey="Phan Bao N" first="N." last="Phan-Bao">N. Phan-Bao</name>
</noRegion>
<name sortKey="Martin, E L" sort="Martin, E L" uniqKey="Martin E" first="E. L." last="Martin">E. L. Martin</name>
<name sortKey="Tata, R" sort="Tata, R" uniqKey="Tata R" first="R." last="Tata">R. Tata</name>
</country>
<country name="Australie"><noRegion><name sortKey="Bessell, M S" sort="Bessell, M S" uniqKey="Bessell M" first="M. S." last="Bessell">M. S. Bessell</name>
</noRegion>
</country>
<country name="Espagne"><noRegion><name sortKey="Martin, E L" sort="Martin, E L" uniqKey="Martin E" first="E. L." last="Martin">E. L. Martin</name>
</noRegion>
</country>
<country name="France"><noRegion><name sortKey="Simon, G" sort="Simon, G" uniqKey="Simon G" first="G." last="Simon">G. Simon</name>
</noRegion>
<name sortKey="Borsenberger, J" sort="Borsenberger, J" uniqKey="Borsenberger J" first="J." last="Borsenberger">J. Borsenberger</name>
<name sortKey="Crifo, F" sort="Crifo, F" uniqKey="Crifo F" first="F." last="Crifo">F. Crifo</name>
<name sortKey="De Batz, B" sort="De Batz, B" uniqKey="De Batz B" first="B." last="De Batz">B. De Batz</name>
<name sortKey="Delfosse, X" sort="Delfosse, X" uniqKey="Delfosse X" first="X." last="Delfosse">X. Delfosse</name>
<name sortKey="Forveille, T" sort="Forveille, T" uniqKey="Forveille T" first="T." last="Forveille">T. Forveille</name>
<name sortKey="Guibert, J" sort="Guibert, J" uniqKey="Guibert J" first="J." last="Guibert">J. Guibert</name>
</country>
</tree>
</affiliations>
</record>
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