2016A&A...586A.157P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.06CEST22:44:21

2016A&A...586A.157P - Astronomy and Astrophysics, volume 586A, 157-157 (2016/2-1)

A new free-floating planet in the Upper Scorpius association.

PENA RAMIREZ K., BEJAR V.J.S. and ZAPATERO OSORIO M.R.

Abstract (from CDS):

We report on a deep photometric survey covering an area of 1.17deg2 in the young Upper Scorpius stellar association using VIMOS Iz and UKIDSS ZJHK data that was taken with several years in between. The search for the least massive population of Upper Scorpius (∼5-10Myr, 145pc) is performed on the basis of various optical and infrared color-color and color-magnitude diagrams, including WISE photometry, in the magnitude interval J=14.5-19mag (completeness), which corresponds to substellar masses from 0.028 through 0.004M at the age and distance of Upper Scorpius. We also present the proper motion analysis of the photometric candidates, finding that two objects successfully pass all photometric and astrometric criteria for membership in the young stellar association. One of them, USco J155150.2-213457, is a new discovery. We obtained low resolution, near-infrared spectroscopy (R∼450, 0.85-2.35µm) of this new finding using the FIRE instrument. We confirmed its low-gravity atmosphere expected for an Upper Scorpius member (weak alkaline lines, strong VO absorption, peaked H-band pseudocontinuum). By comparison with spectroscopic standards, we derive a spectral type of L6±1, and estimate a mass of ≃0.008-0.010M for USco J155150.2-213457. The colors and spectral slope of this object resemble those of other young, cool members of Upper Scorpius and σ Orionis (∼3Myr) and field, high gravity dwarfs of related classification in contrast with the very red indices of field, low gravity, L-type dwarfs of intermediate age. USco J155150.2-213457, which does not show infrared flux excesses up to 4.5µm, becomes one of the least massive and latest type objects known in the entire Upper Scorpius stellar association.

Abstract Copyright:

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

CDS comments: Paragraph 4. VHS J1256-1257b is 2MASS J12560183-1257276 in SIMBAD.

Simbad objects: 36

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Number of rows : 36

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 Cl Blanco 1 OpC 00 04 07 -29 50.0           ~ 233 0
2 DENIS J020529.0-115925 BD* 02 05 29.40072 -11 59 29.6736           L7V 137 0
3 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 750 0
4 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1219 1
5 IC 348 OpC 03 44 34 +32 09.8           ~ 1227 1
6 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2978 0
7 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1977 1
8 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 227 0
9 V* V2187 Ori Or* 05 35 08.7063841993 -05 31 27.537570131     21.57 20.58 18.102 ~ 21 0
10 2MASS J05395200-0059019 BD* 05 39 52.0036661257 -00 59 01.474175739           L5V 73 0
11 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1071 1
12 V* V582 Mon Or* 06 41 10.3403654169 +09 28 33.490089193   17.404   17.21 16.45 K5 165 0
13 NAME Cha I MoC 11 06 48 -77 18.0           ~ 968 1
14 NAME VHS J1256-1257B BD* 12 56 01.83264 -12 57 27.6912           L8.0 32 0
15 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 197 0
16 2MASSW J1515008+484742 BD* 15 15 00.83424 +48 47 41.6904           L6.5 49 0
17 USNO-B1.0 0682-00382279 LM? 15 48 00.9267417779 -21 42 42.477325662       19.2 17.02 ~ 1 0
18 UGCS J154954.53-211503.4 LM? 15 49 54.535 -21 15 03.46         22.070 ~ 1 0
19 UGCS J155011.49-220121.9 LM* 15 50 11.5008784237 -22 01 21.515538202         18.07 M9:Ve 2 0
20 UGCS J155132.77-214243.1 LM? 15 51 32.7791553130 -21 42 43.091138068         18.600 ~ 1 0
21 WISE J155150.18-213457.0 BD* 15 51 50.242 -21 34 57.22         21.896 L6 3 0
22 UGCS J155210.35-213341.4 LM? 15 52 10.356 -21 33 41.42         22.485 ~ 1 0
23 UGCS J155234.28-212448.1 LM? 15 52 34.289 -21 24 48.18         21.565 ~ 1 0
24 2MASS J15541998-2135428 BD* 15 54 19.9874361818 -21 35 42.906144541         18.04 M8Ve 17 0
25 WISE J155450.88-214232.8 LM? 15 54 50.897 -21 42 32.96         20.313 ~ 1 0
26 UGCS J155454.14-214555.4 LM? 15 54 54.141 -21 45 55.45         23.296 ~ 1 0
27 WISE J155508.41-212842.3 LM? 15 55 08.445 -21 28 42.46         20.439 ~ 1 0
28 UScoCTIO 5 EB* 15 59 50.5087554948 -19 44 37.367864195           M4e 34 0
29 NAME Lupus III SFR 16 09.6 -39 03           ~ 271 0
30 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
31 UGCS J161718.97-243718.7 EB* 16 17 18.9814283416 -24 37 18.738577138           M5V 10 0
32 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0
33 * alf Sco ** 16 29 24.45970 -26 25 55.2094 4.08 2.75 0.91 -0.64 -1.87 M0.5Iab+B3V: 690 1
34 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 935 2
35 2MASS J21543454-1055308 BD* 21 54 34.54272 -10 55 30.8424           L5 15 0
36 2MASS J22443167+2043433 BD* 22 44 31.67376 +20 43 43.3020           L6-L8gamma 73 0

    Equat.    Gal    SGal    Ecl

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2020.07.06-22:44:21

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