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

Identifieur interne : 003299 ( PascalFrancis/Checkpoint ); précédent : 003298; suivant : 003300

Discovery 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 :

RBID : Pascal:08-0084061

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English descriptors

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.


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Pascal:08-0084061

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<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>
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<s0>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.</s0>
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