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


Query : 2017A&A...608A..66E

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 - 2022
#notes
1 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2137 1
2 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 533 0
3 ESO-HA 1638 Em* 05 37 53.9802157992 -02 49 54.536632932   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 12.7943963976 -02 12 26.712005436   21.97 20.28 17.94 16.97 M4.0V 11 0
6 [BZR99] S Ori 13 Y*O 05 38 13.2091054320 -02 24 07.556361588   21.07 19.68 18.06 16.13 M5.5 14 0
7 V* V2723 Ori Or* 05 38 17.1808248144 -02 22 25.719885012   22.96 19.21 17.61 15.67 M5.0 16 0
8 2MASS J05381834-0235385 Y*O 05 38 18.3449438472 -02 35 38.571667512 20.863   22.91 20.49 18.08 ~ 15 0
9 Mayrit 379292 Y*O 05 38 21.3850973592 -02 33 36.302074596     20.78 19.47 17.45 ~ 16 0
10 2MASS J05382307-0236493 Y*O 05 38 23.0801723136 -02 36 49.399439220 18.99 19.61 18.45 17.01 15.64 M4.5 15 0
11 V* V2725 Ori Or* 05 38 23.3366740776 -02 25 34.605441120   19.60 18.40 17.22 15.69 M2.0 18 0
12 V* V2728 Ori Or* 05 38 25.4373236808 -02 42 41.266014912   20.88 20.33 19.08 17.20 M7 31 0
13 [BZR99] S Ori 18 Y*O 05 38 25.6854086976 -02 31 21.716183784     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 29.6185929264 -02 25 14.270648484   21.05 20.72 19.02 17.02 M4.0 19 0
16 [BZR99] S Ori 22 Y*O 05 38 35.3557024968 -02 25 22.268716356   22.52 20.73 18.91 16.87 M6e 17 0
17 UGCS J053838.12-023202.6 SB* 05 38 38.1232832688 -02 32 02.654679516 19.98 21.42   18.94 17.36 ~ 7 0
18 2MASS J05383976-0232203 Y*O 05 38 39.7659382656 -02 32 20.386224312   21.83 21.75 19.72 17.52 ~ 12 0
19 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 522 0
20 [BZR99] S Ori 6 Y*O 05 38 47.6632499544 -02 30 37.481740308 20.977 20.25   17.30 15.38 ~ 18 0
21 [BZR99] S Ori 15 Y*O 05 38 48.0991320696 -02 28 53.682649428 21.11 21.32 19.89 18.32 16.42 M5.5e 18 0
22 V* V2737 Ori Or* 05 38 49.2830405880 -02 23 57.624853740 22.321 23.90 19.39 17.67 16.90 M3.8V 22 0
23 [BNM2013] 90.02 362 LM* 05 38 50.7819191472 -02 36 26.805329712 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 54.9292657368 -02 28 58.375755156 21.05 20.21 18.61 17.22 15.48 M4.5 26 0
26 2MASS J05385542-0241208 Y*? 05 38 55.4275077936 -02 41 20.856750756     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 01.1575458936 -02 36 38.885743908 19.061 19.45 18.04 16.70 15.11 ~ 15 0
30 2MASS J05390193-0235029 Y*O 05 39 01.9391478912 -02 35 02.905186848 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 04.4949780000 -02 38 35.381301036     20.00 18.92 16.80 M6 16 0
35 V* V2739 Ori Or* 05 39 07.5686584584 -02 12 14.562946332       19.22 17.16 M7 10 0
36 [BZR99] S Ori 20 Y*O 05 39 07.5827704608 -02 29 05.658266004   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 08.2185362880 -02 32 28.467592548 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 11.4017533992 -02 33 32.831052984 21.773 21.52 19.94 18.32 16.43 M5e 26 0
42 2MASS J05391289-0224537 Y*? 05 39 12.8832672840 -02 24 53.463700008   22.75   21.04 18.94 M6 7 0
43 [BZR99] S Ori 30 Y*O 05 39 13.0855893696 -02 37 50.971269108     20.74 19.34 17.30 M6 18 0
44 UCAC4 438-011271 Y*O 05 39 29.3528446680 -02 27 21.038927076         14.807 M0.0 17 0
45 [BZR99] S Ori 21 Y*O 05 39 34.3303193088 -02 38 46.937656932   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 50.5623676008 -02 34 13.783179504     18.39 17.14 15.24 ~ 15 0
49 2MASS J05395421-0227326 Y*O 05 39 54.2046663960 -02 27 32.726136384   19.81 18.25 16.86 15.21 M4.5 19 0
50 Mayrit 1045094 Y*O 05 39 54.3226700016 -02 37 18.974259444   20.61 20.81 19.05 17.05 M4.5 17 0
51 2MASS J05395645-0238034 Y*O 05 39 56.4511819824 -02 38 03.544254132     18.38 17.13 15.258 M5.0 13 0
52 NAME Upper Sco Association As* 16 12 -23.4           ~ 1192 1
53 NAME eps Ori Cluster Cl* ~ ~           ~ 19 1

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2022.05.28-23:21:53

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