2002A&A...393..597N


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.13CET08:39:04

2002A&A...393..597N - Astronomy and Astrophysics, volume 393, 597-609 (2002/10-2)

Exploring brown dwarf disks in ρ Ophiuchi.

NATTA A., TESTI L., COMERON F., OLIVA E., D'ANTONA F., BAFFA C., COMORETTO G. and GENNARI S.

Abstract (from CDS):

This paper discusses evidence for and properties of disks associated to brown dwarfs in the star-forming region ρ Oph. We selected nine objects from the ISOCAM survey of Bontemps et al. (2001A&A...372..173B) that have detections in the two mid-infrared bands (6.7 and 14.3µm), relatively low extinction and low luminosity. We present low-resolution near-infrared spectra in the J, H and K bands, and determine for each source spectral type, extinction, effective temperature and luminosity by comparing the spectra to those of field dwarfs and to the most recent model stellar atmospheres. The results indicate that eight objects have spectral types M6-M7.5, effective temperature of 2600-2700K, one has a later spectral type (M8.5) and lower temperature (about 2400K). The derived extinctions range between AV∼2 and 8mag. The location of the objects on the HR diagram, in spite of the uncertainties of the evolutionary tracks for young objects of substellar mass, indicates that all the objects are very young and have masses below about 0.08M. The coolest object in our sample has mass in the range 8-12MJ (0.008-0.012M). In all cases, the mid-infrared excess is consistent with the predictions of models of disks irradiated by the central object, showing that circumstellar disks are commonly associated to young brown dwarfs and planetary-mass objects. Finally, we discuss possible variations of the disk geometry among different objects, as well as the possibility of using these data to discriminate between various formation scenarios.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: formation - stars: atmospheres - stars: low-mass, brown dwarfs

CDS comments: Table 1 : Col. 1 ISO#=ISO-Oph, Col. 5 SKS 1-NN cf. table 1 line NN in 1995ApJ.438.813S ([SKS95]).

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME rho Oph Complex reg 16 25 -23.5           ~ 76 1
2 CRBR 2317.3-1925 Y*O 16 26 18.82056 -24 26 10.5216           M7 38 0
3 [GY92] 5 Y*O 16 26 21.5389368381 -24 26 01.000528521       18.30 15.80 M7 57 1
4 [GY92] 3 Y*O 16 26 21.9083577172 -24 44 39.720788042       17.95 15.62 M6.5 43 0
5 [RR90] Oph 2320.8-1721 Y*O 16 26 22.26912 -24 24 07.0632           M8 62 0
6 [GY92] 204 Y*O 16 27 06.5924723987 -24 41 48.883697790       17.57 15.43 M5 78 0
7 BKLT J162737-241756 Y*O 16 27 37.4272403427 -24 17 54.955552302           M7.5 23 0
8 [GY92] 310 Y*O 16 27 38.6280925403 -24 38 39.230714152         17.40 M8 59 0
9 [GY92] 350 Y*O 16 27 46.2918321741 -24 31 41.264641200           M7.5 33 0
10 BKLT J162812-241138 Y*O 16 28 12.7237256177 -24 11 35.723756180           M6 24 0

    Equat.    Gal    SGal    Ecl

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2019.12.13-08:39:04

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