2007A&A...465..855G


Query : 2007A&A...465..855G

2007A&A...465..855G - Astronomy and Astrophysics, volume 465, 855-864 (2007/4-3)

On the circum(sub)stellar environment of brown dwarfs in Taurus.

GUIEU S., PINTE C., MONIN J.-L., MENARD F., FUKAGAWA M., PADGETT D.L., NORIEGA-CRESPO A., CAREY S.J., REBULL L.M., HUARD T. and GUEDEL M.

Abstract (from CDS):

We want to investigate whether brown dwarfs (BDs) form like stars or are ejected embryos. We study the presence of disks around BDs in the Taurus cloud, and discuss implications for substellar formation models. We use photometric measurements from the visible to the far infrared to determine the spectral energy distributions (SEDs) of Taurus BDs. We use Spitzer color indices, Hα as an accretion indicator, and models fit to the SEDs in order to estimate physical parameters of the disks around these BDs. We study the spatial distribution of BDs with and without disks across the Taurus aggregates, and we find that BDs with and without disks are not distributed regularly across the Taurus cloud. We find that 48%±14% of Taurus BDs have a circumstellar disk signature, a ratio similar to recent results from previous authors in other regions. We fit the SEDs and find that none of the disks around BDs in Taurus can be fitted convincingly with a flaring index β=0, indicating that heating by the central object is efficient and that the disks we observe retain a significant amount of gas. We find that BDs with disks are proportionally more numerous in the northern Taurus filament, possibly the youngest filament. We do not find such a clear segregation for classical T Tauri stars (CTTS) and weak-lined T Tauri stars (WTTS), suggesting that, in addition to the effects of evolution, any segregation effects could be related to the mass of the object. A by-product of our study is to propose a recalibration of the Barrado y Navascues & Martin (2003AJ....126.2997B) accretion limit in the substellar domain. The global shape of the limit fits our data points if it is raised by a factor 1.25-1.30.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: low mass, brown dwarfs - stars: pre-main sequence - stars: planetary systems: protoplanetary disks - stars: circumstellar matter

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1368 1
2 [MDM2001] CFHT-BD-Tau 9 LM* 04 24 26.4614592696 +26 49 50.247572160         15.35 M6IVe 42 0
3 [BLH2002] KPNO-Tau 4 BD* 04 27 27.9991044840 +26 12 05.085665388     24.722 20.54 18.75 L0 70 0
4 2MASS J04274538+2357243 LM* 04 27 45.3870426864 +23 57 24.410712420         17.94 M8IVe 31 0
5 [BLH2002] KPNO-Tau 5 LM* 04 29 45.6727447200 +26 30 46.560493080     19.690 19.10 15.08 M7.5Ve 57 0
6 [BLH2002] KPNO-Tau 6 LM* 04 30 07.2454086048 +26 08 20.709374568     22.292 20.56 17.90 M8.5Ve 61 0
7 2MASS J04302365+2359129 LM* 04 30 23.6482755120 +23 59 12.995407284         17.91 M9.9 32 0
8 [BLH2002] KPNO-Tau 7 LM* 04 30 57.2037785664 +25 56 39.548804460     22.068   17.16 M8Ve 56 0
9 2MASS J04312669+2703188 LM* 04 31 26.6921178792 +27 03 18.799150788         17.90 M7IVe 29 0
10 2MASS J04321786+2422149 TT* 04 32 17.8715808504 +24 22 14.900628972     18.2 16.63 14.12 M6.5 49 0
11 2MASS J04325026+2422115 Y*O 04 32 50.2670582784 +24 22 11.662393728         18.79 M7.5 41 0
12 2MASS J04330945+2246487 LM* 04 33 09.4611365736 +22 46 48.640904868         16.26 M7.0 45 0
13 2MASS J04350850+2311398 Y*O 04 35 08.5138827264 +23 11 39.890557752     18.4   14.88 M7IVe 35 0
14 [BLH2002] KPNO-Tau 9 LM* 04 35 51.4276211184 +22 49 11.851904748     24.918   18.76 M8.5V 45 0
15 2MASS J04361038+2259560 Y*O 04 36 10.3843111944 +22 59 55.998727368     22.520   16.81 M8Ve 54 0
16 2MASS J04363893+2258119 Y*O 04 36 38.9292439056 +22 58 11.853847884     21.654   16.88 M7.75 51 0
17 ITG 2 Y*O 04 38 00.8670612744 +25 58 57.270431784       20.21 14.71 M7e 39 0
18 ITG 3 Y*O 04 38 14.8817157144 +26 11 39.946963668       20.33 17.84 M7e 62 0
19 V* GM Tau Or* 04 38 21.3383367240 +26 09 13.775325624     17.577   15.04 M6.5 113 0
20 2MASS J04390396+2544264 Y*O 04 39 03.9609205920 +25 44 26.345775480       18.40 15.40 M7IVe 62 0
21 ITG 17 Y*O 04 39 47.4826636728 +26 01 40.690125912     21.556   15.78 M7 95 0
22 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4248 0
23 ITG 34 Y*O 04 41 10.7863825080 +25 55 11.538967584       19.28 16.43 M5.5e 52 0
24 2MASS J04414825+2534304 Y*O 04 41 48.2522778888 +25 34 30.571843656         17.03 M8e 57 0
25 IRAS S04414+2506 Y*O 04 44 27.1429754400 +25 12 16.434936000           M7e 76 0
26 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1132 1

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2023.09.23-17:11:25

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