SIMBAD references

2017AJ....154...46E - Astron. J., 154, 46-46 (2017/August-0)

A survey for planetary-mass brown dwarfs in the Chamaeleon I star-forming region.


Abstract (from CDS):

We have performed a search for planetary-mass brown dwarfs in the Chamaeleon I star-forming region using proper motions and photometry measured from optical and infrared images from the Spitzer Space Telescope, the Hubble Space Telescope, and ground-based facilities. Through near-IR spectroscopy at Gemini Observatory, we have confirmed six of the candidates as new late-type members of Chamaeleon I (>=M8). One of these objects, Cha J11110675-7636030, has the faintest extinction-corrected MK among known members, which corresponds to a mass of 3-6 MJup according to evolutionary models. That object and two other new members have redder mid-IR colors than young photospheres at <=M9.5, which may indicate the presence of disks. However, since those objects may be later than M9.5 and the mid-IR colors of young photospheres are ill-defined at those types, we cannot determine conclusively whether color excesses from disks are present. If Cha J11110675-7636030 does have a disk, it would be a contender for the least-massive known brown dwarf with a disk. Since the new brown dwarfs that we have found extend below our completeness limit of 6-10 MJup, deeper observations are needed to measure the minimum mass of the initial mass function in Chamaeleon I.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): brown dwarfs - planetary systems - protoplanetary disks - stars: formation - stars: low-mass - stars: luminosity function, mass function - stars: pre-main sequence - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/AJ/154/46): table1.dat table3.dat table4.dat>

Nomenclature: Tables 3-4: [L2007b] Cha JHHMMSSss+DDMMSSs N=5 added.

Simbad objects: 255

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