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| 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
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.
| 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 |
| 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 |
| 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. |