Serveur d'exploration sur les relations entre la France et l'Australie

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Deep search for companions to probable young brown dwarfs VLT/NACO adaptive optics imaging using IR wavefront sensing

Identifieur interne : 005182 ( PascalFrancis/Curation ); précédent : 005181; suivant : 005183

Deep search for companions to probable young brown dwarfs VLT/NACO adaptive optics imaging using IR wavefront sensing

Auteurs : G. Chauvin [France, Allemagne] ; J. Faherty [Chili, États-Unis] ; A. Boccaletti [France] ; K. Cruz [États-Unis] ; A.-M. Lagrange [France] ; B. Zuckerman [États-Unis] ; M. S. Bessell [Australie] ; J.-L. Beuzit [France] ; M. Bonnefoy [Allemagne] ; C. Dumas [Chili] ; P. Lowrance [États-Unis] ; D. Mouillet [France] ; I. Song [États-Unis]

Source :

RBID : Pascal:13-0063981

Descripteurs français

English descriptors

Abstract

Aims. We have obtained high contrast images of four nearby, faint, and very low mass objects 2MASS J04351455-1414468, SDSS J044337.61+000205.1, 2MASSJ06085283-2753583 and 2MASS J06524851-5741376 (hereafter 2MASS0435-14, SDSS0443+00, 2MASS0608-27 and 2MASS0652-57), identified in the field as probable isolated young brown dwarfs. Our goal was to search for binary companions down to the planetary mass regime. Methods. We used the NAOS-CONICA adaptive optics instrument (NACO) and its unique capability to sense the wavefront in the near-infrared to acquire sharp images of the four systems in Ks, with a field of view of 28" x 28". Additional J and L' imaging and follow-up observations at a second epoch were obtained for 2MASS0652-57. Results. With a typical contrast ΔKs = 4.0-7.0 mag, our observations are sensitive down to the planetary mass regime considering a minimum age of 10 to 120 Myr for these systems. No additional point sources are detected in the environment of 2MASS0435-14, SDSS0443+00 and 2MASS0608-27 between 0.1-12" (i.e. about 2 to 250 AU at 20 pc). 2MASS0652-57 is resolved as a ∼230 mas binary. Follow-up observations reject a background contaminate, resolve the orbital motion of the pair, and confirm with high confidence that the system is physically bound. The J, Ks and L' photometry suggest a q ∼ 0.7-0.8 mass ratio binary with a probable semi-major axis of 5-6 AU. Among the four systems, 2MASS0652-57 is probably the less constrained in terms of age determination. Further analysis would be necessary to confirm its youth. It would then be interesting to determine its orbital and physical properties to derive the system's dynamical mass and to test evolutionary model predictions.
pA  
A01 01  1    @0 0004-6361
A02 01      @0 AAEJAF
A03   1    @0 Astron. astrophys. : (Berl., Print)
A05       @2 548
A06       @3 p. 1
A08 01  1  ENG  @1 Deep search for companions to probable young brown dwarfs VLT/NACO adaptive optics imaging using IR wavefront sensing
A11 01  1    @1 CHAUVIN (G.)
A11 02  1    @1 FAHERTY (J.)
A11 03  1    @1 BOCCALETTI (A.)
A11 04  1    @1 CRUZ (K.)
A11 05  1    @1 LAGRANGE (A.-M.)
A11 06  1    @1 ZUCKERMAN (B.)
A11 07  1    @1 BESSELL (M. S.)
A11 08  1    @1 BEUZIT (J.-L.)
A11 09  1    @1 BONNEFOY (M.)
A11 10  1    @1 DUMAS (C.)
A11 11  1    @1 LOWRANCE (P.)
A11 12  1    @1 MOUILLET (D.)
A11 13  1    @1 SONG (I.)
A14 01      @1 UJF-Grenoblel/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble UMR 5274 @2 38041 Grenoble @3 FRA @Z 1 aut. @Z 5 aut. @Z 8 aut. @Z 12 aut.
A14 02      @1 Max Planck Institute for Astronomy, Konigstuhl 17 @2 69117 Heidelberg @3 DEU @Z 1 aut. @Z 9 aut.
A14 03      @1 Departmento de Astronomia, Universidad de Chile, Casilla 36-D @2 Santiago @3 CHL @Z 2 aut.
A14 04      @1 Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street @2 New York, NY 10024 @3 USA @Z 2 aut. @Z 4 aut.
A14 05      @1 LESIA-Observatoire de Paris, CNRS, UPMC Univ. Paris 06, Univ. Paris-Diderot @2 92195 Meudon @3 FRA @Z 3 aut.
A14 06      @1 Department of Physics & Astronomy, Hunter College, City University of New York, 695 Park Avenue @2 New York, NY 10065 @3 USA @Z 4 aut.
A14 07      @1 Department of Physics & Astronomy and Center for Astrobiology, University of California: Los Angeles, Box 951562 @2 CA 90095 @3 USA @Z 6 aut.
A14 08      @1 Research School of Astronomy and Astrophysics Institute of Advance Studies, Australian National University: Cotter Road, Weston Creek @2 Canberra, ACT 2611 @3 AUS @Z 7 aut.
A14 09      @1 European Southern Observatory @2 Casilla 19001, Santiago @3 CHL @Z 10 aut.
A14 10      @1 Infrared Processing and Analysis Center, MS 100-22, California Institute of Technology @2 Pasadena, CA 91125 @3 USA @Z 11 aut.
A14 11      @1 Department of Physics & Astronomy, University of Georgia @2 Athens, GA 30602-2451 @3 USA @Z 13 aut.
A20       @2 A33.1-A33.5
A21       @1 2012
A23 01      @0 ENG
A43 01      @1 INIST @2 14176 @5 354000506265070280
A44       @0 0000 @1 © 2013 INIST-CNRS. All rights reserved.
A45       @0 3/4 p.
A47 01  1    @0 13-0063981
A60       @1 P
A61       @0 A
A64 01  1    @0 Astronomy and astrophysics : (Berlin. Print)
A66 01      @0 FRA
C01 01    ENG  @0 Aims. We have obtained high contrast images of four nearby, faint, and very low mass objects 2MASS J04351455-1414468, SDSS J044337.61+000205.1, 2MASSJ06085283-2753583 and 2MASS J06524851-5741376 (hereafter 2MASS0435-14, SDSS0443+00, 2MASS0608-27 and 2MASS0652-57), identified in the field as probable isolated young brown dwarfs. Our goal was to search for binary companions down to the planetary mass regime. Methods. We used the NAOS-CONICA adaptive optics instrument (NACO) and its unique capability to sense the wavefront in the near-infrared to acquire sharp images of the four systems in Ks, with a field of view of 28" x 28". Additional J and L' imaging and follow-up observations at a second epoch were obtained for 2MASS0652-57. Results. With a typical contrast ΔKs = 4.0-7.0 mag, our observations are sensitive down to the planetary mass regime considering a minimum age of 10 to 120 Myr for these systems. No additional point sources are detected in the environment of 2MASS0435-14, SDSS0443+00 and 2MASS0608-27 between 0.1-12" (i.e. about 2 to 250 AU at 20 pc). 2MASS0652-57 is resolved as a ∼230 mas binary. Follow-up observations reject a background contaminate, resolve the orbital motion of the pair, and confirm with high confidence that the system is physically bound. The J, Ks and L' photometry suggest a q ∼ 0.7-0.8 mass ratio binary with a probable semi-major axis of 5-6 AU. Among the four systems, 2MASS0652-57 is probably the less constrained in terms of age determination. Further analysis would be necessary to confirm its youth. It would then be interesting to determine its orbital and physical properties to derive the system's dynamical mass and to test evolutionary model predictions.
C02 01  3    @0 001E03
C03 01  3  FRE  @0 Naine brune @5 26
C03 01  3  ENG  @0 Brown dwarf stars @5 26
C03 02  3  FRE  @0 Optique adaptative @5 27
C03 02  3  ENG  @0 Adaptive optics @5 27
C03 03  3  FRE  @0 Front onde @5 28
C03 03  3  ENG  @0 Wave front @5 28
C03 04  X  FRE  @0 Age @5 29
C03 04  X  ENG  @0 Age @5 29
C03 04  X  SPA  @0 Edad @5 29
C03 05  3  FRE  @0 Source ponctuelle @5 30
C03 05  3  ENG  @0 Point sources @5 30
C03 06  3  FRE  @0 Photométrie @5 31
C03 06  3  ENG  @0 Photometry @5 31
C03 07  X  FRE  @0 Rapport masse @5 32
C03 07  X  ENG  @0 Mass ratio @5 32
C03 07  X  SPA  @0 Relación masa @5 32
C03 08  3  FRE  @0 Propriété physique @5 33
C03 08  3  ENG  @0 Physical properties @5 33
C03 09  3  FRE  @0 Système dynamique @5 34
C03 09  3  ENG  @0 Dynamical systems @5 34
C03 10  X  FRE  @0 Modèle @5 35
C03 10  X  ENG  @0 Models @5 35
C03 10  X  SPA  @0 Modelo @5 35
C03 11  3  FRE  @0 Binaire serrée @5 36
C03 11  3  ENG  @0 Close binary stars @5 36
C03 12  3  FRE  @0 Traitement image @5 37
C03 12  3  ENG  @0 Image processing @5 37
N21       @1 042
N44 01      @1 OTO
N82       @1 OTO

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<title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title>
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<term>Adaptive optics</term>
<term>Age</term>
<term>Brown dwarf stars</term>
<term>Close binary stars</term>
<term>Dynamical systems</term>
<term>Image processing</term>
<term>Mass ratio</term>
<term>Models</term>
<term>Photometry</term>
<term>Physical properties</term>
<term>Point sources</term>
<term>Wave front</term>
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<div type="abstract" xml:lang="en">Aims. We have obtained high contrast images of four nearby, faint, and very low mass objects 2MASS J04351455-1414468, SDSS J044337.61+000205.1, 2MASSJ06085283-2753583 and 2MASS J06524851-5741376 (hereafter 2MASS0435-14, SDSS0443+00, 2MASS0608-27 and 2MASS0652-57), identified in the field as probable isolated young brown dwarfs. Our goal was to search for binary companions down to the planetary mass regime. Methods. We used the NAOS-CONICA adaptive optics instrument (NACO) and its unique capability to sense the wavefront in the near-infrared to acquire sharp images of the four systems in K
<sub>s</sub>
, with a field of view of 28" x 28". Additional J and L' imaging and follow-up observations at a second epoch were obtained for 2MASS0652-57. Results. With a typical contrast ΔK
<sub>s</sub>
= 4.0-7.0 mag, our observations are sensitive down to the planetary mass regime considering a minimum age of 10 to 120 Myr for these systems. No additional point sources are detected in the environment of 2MASS0435-14, SDSS0443+00 and 2MASS0608-27 between 0.1-12" (i.e. about 2 to 250 AU at 20 pc). 2MASS0652-57 is resolved as a ∼230 mas binary. Follow-up observations reject a background contaminate, resolve the orbital motion of the pair, and confirm with high confidence that the system is physically bound. The J, K
<sub>s</sub>
and L' photometry suggest a q ∼ 0.7-0.8 mass ratio binary with a probable semi-major axis of 5-6 AU. Among the four systems, 2MASS0652-57 is probably the less constrained in terms of age determination. Further analysis would be necessary to confirm its youth. It would then be interesting to determine its orbital and physical properties to derive the system's dynamical mass and to test evolutionary model predictions.</div>
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<sub>s</sub>
, with a field of view of 28" x 28". Additional J and L' imaging and follow-up observations at a second epoch were obtained for 2MASS0652-57. Results. With a typical contrast ΔK
<sub>s</sub>
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<sub>s</sub>
and L' photometry suggest a q ∼ 0.7-0.8 mass ratio binary with a probable semi-major axis of 5-6 AU. Among the four systems, 2MASS0652-57 is probably the less constrained in terms of age determination. Further analysis would be necessary to confirm its youth. It would then be interesting to determine its orbital and physical properties to derive the system's dynamical mass and to test evolutionary model predictions.</s0>
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