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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693736.0, MPI für Astronomie / Publikationen_mpia
Search for Pleiades T dwarfs
Authors:Gálvez-Ortiz, M. C.; Zapatero Osorio, M. R.; Bihain, G.; Boudreault, S.; Rebolo, R.; Caballero, J. A.; Béjar, V. J. S.; Henning, T.; Goldman, B.; Mundt, R.; Bailer-Jones, C. A. L.; Manjavacas, E.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Memorie della Societa Astronomica Italiana
Issue / Number:4
Start Page:945
End Page:947
Audience:Not Specified
Abstract / Description:We present our on-going project aimed at identifying Pleiades T-type planetary-mass members. An area of 0.82 deg2 was explored photometric and astrometrically with deep images taken in the J and H filters and separated by 9 yr. The survey limiting magnitude is J, H = 21 mag. The long time baseline allowed us to measure proper motions, since the cluster motion is quite distinctive. For a small fraction of our survey, methane images in the H-band are also available. To select our candidates we imposed the following criteria: H > 18 mag, J - H < 0.3 mag, and proper motions compatible with that of the cluster at the 1.5-sigma level. According to substellar evolutionary models, our exploration is sensitive to T-type Pleiads with masses in the interval 9-15 M_Jup. These observations will lead to the study of the planetary mass function in the Pleiades cluster. Confirmed Pleiades T-type dwarfs will have a well-defined age (120 Myr) and solar metallicity; they will thus become benchmark objects for our understanding of the ultracool dwarf population (both single and orbiting stars, including massive planets) of the solar vicinity.
Free Keywords:Galaxy: open clusters and associations: individual: Pleiades; Stars: brown dwarfs; low-mass; Techniques: photometric; proper motions
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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