2017A&A...608A..66E


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.09CET12:13:10

2017A&A...608A..66E - Astronomy and Astrophysics, volume 608A, 66-66 (2017/12-1)

A deep staring campaign in the σ Orionis cluster. Variability in substellar members.

ELLIOTT P., SCHOLZ A., JAYAWARDHANA R., EISLOFFEL J. and HEBRARD E.M.

Abstract (from CDS):

Context. The young star cluster near σ Orionis is one of the primary environments to study the properties of young brown dwarfs down to masses comparable to those of giant planets.
Aims. Deep optical imaging is used to study time-domain properties of young brown dwarfs over typical rotational timescales and to search for new substellar and planetary-mass cluster members.
Methods. We used the Visible Multi Object Spectrograph (VIMOS) at the Very Large Telescope (VLT) to monitor a 24'x 16' field in the I-band. We stared at the same area over a total integration time of 21h, spanning three observing nights. Using the individual images from this run we investigated the photometric time series of nine substellar cluster members with masses from 10 to 60MJup. The deep stacked image shows cluster members down to ~=5MJup. We searched for new planetary-mass objects by combining our deep I-band photometry with public J-band magnitudes and by examining the nearby environment of known very low mass members for possible companions.
Results. We find two brown dwarfs, with significantly variable, aperiodic light curves, both with masses around 50MJup, one of which was previously unknown to be variable. The physical mechanism responsible for the observed variability is likely to be different for the two objects. The variability of the first object, a single-lined spectroscopic binary, is most likely linked to its accretion disc; the second may be caused by variable extinction by large grains. We find five new candidate members from the colour-magnitude diagram and three from a search for companions within 2000 au. We rule all eight sources out as potential members based on non-stellar shape and/or infrared colours. The I-band photometry is made available as a public dataset.
Conclusions. We present two variable brown dwarfs. One is consistent with ongoing accretion, the other exhibits apparent transient variability without the presence of an accretion disc. Our analysis confirms the existing census of substellar cluster members down to ~=7MJup. The zero result from our companion search agrees with the low occurrence rate of wide companions to brown dwarfs found in other works.

Abstract Copyright: © ESO, 2017

Journal keyword(s): brown dwarfs - stars: low-mass - stars: rotation - techniques: photometric - binaries: visual - binaries: visual

VizieR on-line data: <Available at CDS (J/A+A/608/A66): tableb1.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 53

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Number of rows : 53

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 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2041 1
2 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 500 0
3 ESO-HA 1638 Em* 05 37 53.9797574895 -02 49 54.532458295   20.07 18.47 17.19 15.71 M2.5: 12 0
4 [FPS2006] NX 46 X 05 38.0 -02 30           ~ 3 0
5 V* V2721 Ori Or* 05 38 12.7942558843 -02 12 26.702125993   21.97 20.28 17.94 16.97 M4.0V 11 0
6 [BZR99] S Ori 13 Y*O 05 38 13.2092361094 -02 24 07.550933226   21.07 19.68 18.06 16.13 M5.5 14 0
7 V* V2723 Ori Or* 05 38 17.1803886299 -02 22 25.719348411   22.96 19.21 17.61 15.67 M5.0 15 0
8 2MASS J05381834-0235385 Y*O 05 38 18.3427958012 -02 35 38.521069766 20.863   22.91 20.49 18.08 ~ 15 0
9 Mayrit 379292 Y*O 05 38 21.3860880281 -02 33 36.294537911     20.78 19.47 17.45 ~ 16 0
10 2MASS J05382307-0236493 Y*O 05 38 23.077 -02 36 49.37 18.99 19.61 18.45 17.01 15.64 M4.5 15 0
11 V* V2725 Ori Or* 05 38 23.3367448676 -02 25 34.603396389   19.60 18.40 17.22 15.69 M2.0 16 0
12 V* V2728 Ori Or* 05 38 25.4362816834 -02 42 41.261836830   20.88 20.33 19.08 17.20 M7 30 0
13 [BZR99] S Ori 18 Y*O 05 38 25.6849274690 -02 31 21.697219141     19.99 18.68 16.59 M3.5 16 0
14 [BZR99] S Ori 65 BD* 05 38 26.1 -02 23 05         23.23 L3.5: 10 0
15 [BZR99] S Ori 29 Or* 05 38 29.6182347465 -02 25 14.263130080   21.05 20.72 19.02 17.02 M4.0 19 0
16 [BZR99] S Ori 22 Y*O 05 38 35.3554530251 -02 25 22.265813025   22.52 20.73 18.91 16.87 M6e 17 0
17 UGCS J053838.12-023202.6 SB* 05 38 38.1244390349 -02 32 02.682379990 19.98 21.42   18.94 17.36 ~ 7 0
18 2MASS J05383976-0232203 Y*O 05 38 39.7670028572 -02 32 20.400551881   21.83 21.75 19.72 17.52 ~ 12 0
19 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 498 0
20 [BZR99] S Ori 6 Y*O 05 38 47.6632054562 -02 30 37.478943692 20.977 20.25   17.30 15.38 ~ 17 0
21 [BZR99] S Ori 15 Y*O 05 38 48.0990263161 -02 28 53.680362302 21.11 21.32 19.89 18.32 16.42 M5.5e 17 0
22 V* V2737 Ori Or* 05 38 49.2830965085 -02 23 57.623954857 22.321 23.90 19.39 17.67 16.90 M3.8V 22 0
23 [BNM2013] 90.02 362 LM* 05 38 50.7820933287 -02 36 26.805015425 18.816 18.76   16.98 15.12 M3.0 16 0
24 [MJO2008] J053852.6-023215 * 05 38 52.6 -02 32 15         18.88 ~ 3 0
25 2MASS J05385492-0228583 Y*O 05 38 54.9294057342 -02 28 58.375274422 21.05 20.21 18.61 17.22 15.48 M4.5 26 0
26 2MASS J05385542-0241208 Y*? 05 38 55.4294376168 -02 41 20.879454467     21.25   18.59 ~ 13 0
27 UGCS J053900.29-023705.7 Y*? 05 39 00.29712 -02 37 05.7648           M8 23 0
28 [CH2010] CTIO J05390031-0237059 V* 05 39 00.312 -02 37 05.86 19.716         ~ 3 0
29 2MASS J05390115-0236388 Y*O 05 39 01.1576696909 -02 36 38.885994698 19.061 19.45 18.04 16.70 15.11 ~ 14 0
30 2MASS J05390193-0235029 Y*O 05 39 01.9389175758 -02 35 02.903447076 19.818 20.72 19.68 18.46 17.11 M4 21 0
31 [BZR99] S Ori 51 LM* 05 39 03.20592 -02 30 19.9440         20.32 M9Ve 17 0
32 [BZR99] S Ori 58 BD* 05 39 03.59736 -02 25 36.6060         21.50 L0e 13 0
33 UGCS J053904.16-023110.7 NIR 05 39 04.166 -02 31 10.76           ~ 1 0
34 [BZR99] S Ori 17 Y*O 05 39 04.4946632736 -02 38 35.384185252     20.00 18.92 16.80 M6 16 0
35 V* V2739 Ori Or* 05 39 07.5698088134 -02 12 14.566181081       19.22 17.16 ~ 9 0
36 [BZR99] S Ori 20 Y*O 05 39 07.5830702951 -02 29 05.657145325   22.49   19.02 17.03 M5.5 16 0
37 UGCS J053907.82-023055.1 NIR 05 39 07.830 -02 30 55.11           ~ 1 0
38 2MASS J05390808-0228447 Y*O 05 39 08.086 -02 28 44.77 19.34 19.57 18.69 17.56 15.88 M4.0 16 0
39 [BZR99] S Ori 7 Y*O 05 39 08.2189863578 -02 32 28.472631501 20.85 20.61 19.10 17.55 15.70 ~ 16 0
40 [BZR99] S Ori 50 LM* 05 39 10.80408 -02 37 14.5884         20.52 M9V 11 0
41 Mayrit 425070 Y*O 05 39 11.4014704592 -02 33 32.826664924 21.773 21.52 19.94 18.32 16.43 M5e 26 0
42 2MASS J05391289-0224537 Y*? 05 39 12.8898955469 -02 24 53.514501790   22.75   21.04 18.94 M6 7 0
43 [BZR99] S Ori 30 Y*O 05 39 13.0851935602 -02 37 50.971219000     20.74 19.34 17.30 M6 18 0
44 2MASS J05392935-0227209 Y*O 05 39 29.3528925920 -02 27 21.036989789         14.807 M0.0 16 0
45 [BZR99] S Ori 21 Y*O 05 39 34.3290731855 -02 38 46.903104825   21.01 21.12 19.27 17.29 ~ 17 0
46 [BZR99] S Ori 60 BD* 05 39 37.51848 -02 30 41.9220         22.75 L2 18 0
47 [BZR99] S Ori 62 BD* 05 39 42.05208 -02 30 31.6080         23.03 L2:e 12 0
48 2MASS J05395056-0234137 Y*O 05 39 50.5623128499 -02 34 13.785307693     18.39 17.14 15.24 ~ 14 0
49 2MASS J05395421-0227326 Y*O 05 39 54.2048070580 -02 27 32.726308056   19.81 18.25 16.86 15.21 M4.5 18 0
50 Mayrit 1045094 Y*O 05 39 54.3226122744 -02 37 18.966776375   20.61 20.81 19.05 17.05 M4.5 17 0
51 2MASS J05395645-0238034 Y*O 05 39 56.4504210189 -02 38 03.554521225     18.38 17.13 15.258 M5.0 13 0
52 NAME Upper Sco Association As* 16 12 -23.4           ~ 1086 1
53 NAME eps Ori Cluster Cl* ~ ~           ~ 19 1

    Equat.    Gal    SGal    Ecl

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2021.03.09-12:13:11

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