2005A&A...443.1021C


Query : 2005A&A...443.1021C

2005A&A...443.1021C - Astronomy and Astrophysics, volume 443, 1021-1024 (2005/12-1)

A search for planetary-mass objects and brown dwarfs in the Upper Scorpius association.

COSTADO M.T., BEJAR V.J.S., CABALLERO J.A., REBOLO R., ACOSTA-PULIDO J. and MANCHADO A.

Abstract (from CDS):

We report the results of a deep photometric search for planets and brown dwarfs in the nearby young OB Upper Scorpius association. We obtained optical (I) and near-infrared (JKs) images around nine very low-mass stars and brown dwarf member candidates of the association, covering a total area of 113arcmin2. Using a point spread function subtraction technique, we have searched for planetary-mass companions (0.002M<M<0.013M) at separations as close as 3" from the targets. We have not found any brown dwarfs more massive than 0.030M at projected distances larger than 70AU, or planets more massive than 0.007M at projected distances larger than 600AU. We set an upper limit of 20% (confidence level 68.3%) to the fraction of very low-mass stars and massive brown dwarfs with planetary mass companions (M>0.007M) at physical distances larger than 600AU. From the J, I-J colour-magnitude diagrams and follow-up Ks-band photometry, we identify four very red objects (I-J > 2.5) in the area of the survey. According to their positions in the diagram, below the expected theoretical sequence of the cluster, three are probable late M-dwarfs in the field. The faintest and reddest object (J-Ks=2.39±0.06) may be either a field intermediate L-dwarf with anomalously red J-Ks colour at a distance of ∼135pc, an extremely red distant galaxy, or a reddened planetary-mass object in the Upper Scorpius association.

Abstract Copyright:

Journal keyword(s): stars: low mass, brown dwarfs - open clusters and associations: individual: Upper Scorpius

Nomenclature: Table 3: [CBC2005] N (Nos 1-4).

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 UScoCTIO 121 PM* 15 51 47.3247380204 -26 23 47.880785421           M6e 7 0
2 UScoCTIO 128 TT* 15 59 11.3529050285 -23 38 00.355330772           M7e 44 0
3 UScoCTIO 112 TT* 16 00 26.7027582833 -20 56 31.621993681           M5.5e 37 0
4 UScoCTIO 100 TT* 16 02 04.3052095163 -20 50 42.583854727         15.156 M7e 36 0
5 [PGZ2001] J160622.8-201124 Y*O 16 06 22.7841283270 -20 11 24.363503115           M5e 28 0
6 [CBC2005] 2 LM* 16 06 25.2 -20 04 41         22.22 ~ 1 0
7 [CBC2005] 1 LM* 16 06 26.0 -20 11 52         22.5 ~ 1 0
8 [PGZ2001] J160628.7-200357 Y*O 16 06 28.7296279554 -20 03 57.153903359           M5e 12 0
9 [PGZ2001] J160629.0-205216 Y*O 16 06 28.9686182433 -20 52 17.209427317           M5e 9 0
10 [CBC2005] 4 LM* 16 06 29.1 -20 19 28         23.0 ~ 1 0
11 [CBC2005] 3 LM* 16 06 31.2 -20 53 50         21.43 ~ 1 0
12 [PGZ2001] J160632.1-202053 Y*O 16 06 32.1047587935 -20 20 53.887823645           M5e 11 0
13 NAME Upper Sco Association As* 16 12 -23.4           ~ 1114 1
14 NAME Sco-Cen-Lup reg 16 20.0 -27 00           ~ 15 0

    Equat.    Gal    SGal    Ecl

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2021.07.27-08:21:01

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