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Discovery of seven companions to intermediate-mass stars with extreme mass ratios in the Scorpius-Centaurus association
Indexado
WoS WOS:000356633700009
Scopus SCOPUS_ID:84930938110
DOI 10.1088/2041-8205/806/1/L9
Año 2015
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



We report the detection of seven low-mass companions to intermediate-mass stars (SpT B/A/F; M similar to 1.5-4.5M(circle dot)) in the Scorpius-Centaurus (Sco-Cen) Association using nonredundant aperture masking interferometry. Our newly detected objects have contrasts Delta L' approximate to 4-6, corresponding to masses as low as similar to 20 M-Jup and mass ratios of q approximate to 0.01-0.08, depending on the assumed age of the target stars. With projected separations rho approximate to 10-30 AU, our aperture masking detections sample an orbital region previously unprobed by conventional adaptive optics imaging of intermediate-mass Sco-Cen stars covering much larger orbital radii (similar to 30-3000 AU). At such orbital separations, these objects resemble higher-mass versions of the directly imaged planetary mass companions to the 10-30 Myr, intermediate-mass stars HR 8799, beta Pictoris, and HD 95086. These newly discovered companions span the brown dwarf desert, and their masses and orbital radii provide a new constraint on models of the formation of low-mass stellar and substellar companions to intermediate-mass stars.

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Disciplinas de Investigación



WOS
Astronomy & Astrophysics
Scopus
Sin Disciplinas
SciELO
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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Hinkley, Sasha Hombre Univ Exeter - Reino Unido
University of Exeter - Reino Unido
2 Kraus, Adam Hombre Univ Texas Austin - Estados Unidos
The University of Texas at Austin - Estados Unidos
3 Ireland, Michael J. Hombre Australian Natl Univ - Australia
Australian National University - Australia
The Australian National University - Australia
4 Cheetham, Anthony Hombre UNIV SYDNEY - Australia
The University of Sydney - Australia
5 Carpenter, John M. Hombre CALTECH - Estados Unidos
California Institute of Technology - Estados Unidos
6 Tuthill, Peter Hombre UNIV SYDNEY - Australia
The University of Sydney - Australia
7 Lacour, S. Hombre Univ Paris Diderot - Francia
LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique - Francia
8 Mikal-Evans, Thomas Hombre Univ Exeter - Reino Unido
University of Exeter - Reino Unido
9 Haubois, Xavier Hombre UNIV SYDNEY - Australia
ESO - Chile
The University of Sydney - Australia
European Southern Observatory Santiago - Chile

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Origen de Citas Identificadas



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Citas identificadas: Las citas provienen de documentos incluidos en la base de datos de DATACIENCIA

Citas Identificadas: 15.56 %
Citas No-identificadas: 84.44 %

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Citas identificadas: Las citas provienen de documentos incluidos en la base de datos de DATACIENCIA

Citas Identificadas: 15.56 %
Citas No-identificadas: 84.44 %

Financiamiento



Fuente
National Science Foundation
W. M. Keck Foundation
NSF Astronomy and Astrophysics Postdoctoral Fellowship
NASA through Hubble Fellowship
NASA through the Sagan Fellowship Program
Clay Fellowship
AURA, Inc., for NASA
Directorate for Mathematical and Physical Sciences

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Agradecimientos



Agradecimiento
We thank the anonymous referee for several helpful comments. We also thank Isabelle Baraffe and Giles Chabrier for producing versions of their evolutionary models at customized ages. This work was performed in part under contract with the California Institute of Technology (Caltech) funded by NASA through the Sagan Fellowship Program and an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1203023. A.L.K. was suported by a Clay Fellowship as well as NASA through Hubble Fellowship grant 51257.01 awarded by the STScI, which is operated by AURA, Inc., for NASA, under contract NAS 5-26555. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and NASA. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

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