2009A&A...506.1169B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:34:40

2009A&A...506.1169B - Astronomy and Astrophysics, volume 506, 1169-1182 (2009/11-2)

Candidate free-floating super-Jupiters in the young σ Orionis open cluster.

BIHAIN G., REBOLO R., ZAPATERO OSORIO M.R., BEJAR V.J.S., VILLO-PEREZ I., DIAZ-SANCHEZ A., PEREZ-GARRIDO A., CABALLERO J.A., BAILER-JONES C.A.L., BARRADO Y NAVASCUES D., EISLOEFFEL J., FORVEILLE T., GOLDMAN B., HENNING T., MARTIN E.L. and MUNDT R.

Abstract (from CDS):

Free-floating substellar candidates with estimated theoretical masses of as low as ∼5 Jupiter masses have been found in the ∼3Myr old {sigma} Orionis open cluster. As the overlap with the planetary mass domain increases, the question of how these objects form becomes important. The determination of their number density and whether a mass cut-off limit exists is crucial to understanding their formation. We propose to search for objects of yet lower masses in the cluster and determine the shape of the mass function at low mass. Using new- and (re-analysed) published IZJHKs[3.6]-[8.0]-band data of an area of 840arcmin2, we performed a search for LT-type cluster member candidates in the magnitude range J=19.5-21.5mag, based on their expected magnitudes and colours. Besides recovering the T type object SOri 70 and two other known objects, we find three new cluster member candidates, SOri 72-74, with J≃21mag and within 12arcmin of the cluster centre. They have theoretical masses of 4–2+3MJup and are among the least massive free-floating objects detected by direct imaging outside the Solar System. The photometry in archival Spitzer [3.6]-[5.8]-band images infers that SOri 72 is an L/T transition candidate and SOri 73 a T-type candidate, following the expected cluster sequence in the mid-infrared. Finally, the L-type candidate SOri 74 with lower quality photometry is located at 11.8arcsec (∼4250AU) of a stellar member of σ Orionis and could be a companion. After contaminant correction in the area complete to J=21.1mag, we estimate that there remain between zero and two cluster members in the mass interval 6-4MJup. We present SOri 73, a new candidate T type and candidate σ Orionis member of a few Jupiter masses. Our result suggests a possible turnover in the substellar mass spectrum below ∼6 Jupiter masses, which could be investigated further by wider and deeper photometric surveys.

Abstract Copyright:

Journal keyword(s): stars: luminosity function, mass function - Galaxy: open clusters and associations: individual: σ Orionis - stars: low-mass, brown dwarfs

Nomenclature: Table 4: [BZR99] S Ori NN (Nos 72-74) added. Table 5: [BMZ2001] S Ori JHHMMSS.s+DDMMSS N=2 added.

Simbad objects: 24

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Number of rows : 24

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 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 235 0
2 M 42 HII 05 35 17.3 -05 23 28           ~ 3724 0
3 [BZR99] S Ori 70 BD* 05 38 10.10 -02 36 26.0           T6-7 46 0
4 [BMZ2001] S Ori J053811.0-023601 * 05 38 11.0 -02 36 01           ~ 1 0
5 [BMZ2001] S Ori J053814.5-024512 * 05 38 14.19 -02 45 11.8           ~ 6 0
6 NAME Ori A MoC 05 38 -07.1           ~ 2675 0
7 [BZR99] S Ori 54 LM* 05 38 33.33648 -02 20 59.4060           M9.5Ve 11 0
8 2MASS J05383888-0228016 Y*O 05 38 38.8911596595 -02 28 01.731339488 20.95 21.83   18.77 16.99 M5Ve 24 0
9 [BZR99] S Ori 68 BD* 05 38 39.1 -02 28 05         23.77 L5: 24 1
10 [BMZ2001] S Ori J053840.8-024022 * 05 38 40.0 -02 40 22           ~ 1 0
11 DENIS J053841.2-023737 * 05 38 41.2346379777 -02 37 37.752291558         17.55 ~ 11 1
12 UCAC2 30800097 LM* 05 38 41.2928629867 -02 37 22.625846957 16.93 15.86 14.54 13.67 12.78 M0.0 17 0
13 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 486 0
14 [W96] 4771-1051 TT* 05 38 44.2344761436 -02 40 19.772028742 15.88 15.24 14.02 13.22 12.41 K7.5/8e 21 0
15 [BZR99] S Ori 74 * 05 38 44.27 -02 40 07.9         24.6 ~ 2 0
16 2MASS J05384448-0240376 Y*O 05 38 44.4905453418 -02 40 37.736558846     21.37 19.41 17.24 ~ 13 0
17 2MASS J05384449-0240305 Y*O 05 38 44.4968548759 -02 40 30.567860226 20.10 19.26 17.75 16.51 14.91 ~ 13 0
18 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 738 0
19 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 400 0
20 [BZR99] S Ori 72 * 05 38 59.17 -02 35 26.0           ~ 4 0
21 2MASS J05385930-0235282 IR 05 38 59.3025481703 -02 35 28.670935803           ~ 3 0
22 [BZR99] S Ori 58 BD* 05 39 03.59736 -02 25 36.6060         21.50 L0e 13 0
23 [BMZ2001] S Ori J053932.4-025220 Y*? 05 39 32.43 -02 52 20.2         22.87 ~ 5 0
24 [BMZ2001] S Ori J054011.6-025135 * 05 40 11.58 -02 51 34.6         22.95 ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-21:34:40

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