2016A&A...594A..83D


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET06:51:20

2016A&A...594A..83D - Astronomy and Astrophysics, volume 594A, 83-83 (2016/10-1)

Brown dwarf disks with Herschel: Linking far-infrared and (sub)-mm fluxes.

DAEMGEN S., NATTA A., SCHOLZ A., TESTI L., JAYAWARDHANA R., GREAVES J. and EASTWOOD D.

Abstract (from CDS):

Brown dwarf disks are excellent laboratories to test our understanding of disk physics in an extreme parameter regime. In this paper we investigate a sample of 29 well-characterized brown dwarfs and very low-mass stars, for which Herschel far-infrared fluxes and (sub)-mm fluxes are available. We measured new Herschel/PACS fluxes for 11 objects and complement these with (sub)-mm data and Herschel fluxes from the literature. We analyze their spectral energy distributions in comparison with results from radiative transfer modeling. Fluxes in the far-infrared are strongly affected by the shape and temperature of the disk (and hence stellar luminosity), whereas the (sub)-mm fluxes mostly depend on disk mass. Nevertheless, there is a clear correlation between far-infrared and (sub)-mm fluxes. We argue that the link results from the combination of the stellar mass-luminosity relation and a scaling between disk mass and stellar mass. We find strong evidence of dust settling to the disk midplane. The spectral slopes between near- and far-infrared are mostly between -0.5 and -1.2 in our sample, which is comparable to more massive T Tauri stars; this may imply that the disk shapes are similar as well, although highly flared disks are rare among brown dwarfs. We find that dust temperatures in the range of 7-15K, calculated with T~=25(L/L)0.25K, are appropriate for deriving disk masses from (sub)-mm fluxes for these low luminosity objects. About half of our sample hosts disks with at least one Jupiter mass, confirming that many brown dwarfs harbor sufficient material for the formation of Earth-mass planets in their midst.

Abstract Copyright: © ESO, 2016

Journal keyword(s): brown dwarfs - circumstellar matter - stars: pre-main sequence - infrared: stars - submillimeter: stars

Simbad objects: 38

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Number of rows : 38

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 V* FN Tau Or* 04 14 14.5943659839 +28 27 58.063377983     14.70 13.68   M5 142 0
2 [BCG93] 1 TT* 04 14 17.6094853639 +28 06 09.650035718 18.04         M4.5 73 0
3 2MASS J04155799+2746175 TT* 04 15 58.0007626956 +27 46 17.335519842           M5.2 24 0
4 [BLH2002] KPNO-Tau 10 Y*O 04 17 49.5566788466 +28 13 31.770397307     17.8     M5Ve 36 0
5 IRAS 04158+2805 Y*O 04 18 58.1407377664 +28 12 23.347645825           M5.25 88 0
6 2MASS J04202555+2700355 Y*O 04 20 25.5568397008 +27 00 35.548947507           M5e 26 0
7 2MASS J04230607+2801194 Y*O 04 23 06.0802612915 +28 01 19.554193348           M6 26 0
8 [BLH2002] KPNO-Tau 3 LM* 04 26 29.3901723833 +26 24 13.722007135     20.239     M6Ve 43 0
9 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 188 1
10 IRAS F04262+2654 Y*O 04 29 21.6613024117 +27 01 25.528751719           M5.9 39 0
11 V* FW Tau Or* 04 29 29.703744 +26 16 53.06412       15.85   M5.5 118 0
12 NAME ZZ Tau IRS TT* 04 30 51.7198337523 +24 41 47.604184059     17.1     M5IVe 39 0
13 2MASS J04322210+1827426 TT* 04 32 22.1106070891 +18 27 42.648224021           M5.0 38 0
14 2MASS J04330945+2246487 LM* 04 33 09.4629919840 +22 46 48.623660040         16.26 M7.0 32 0
15 2MASS J04334465+2615005 TT* 04 33 44.6603141468 +26 15 00.429276341           M5.2 27 0
16 ITG 3 Y*O 04 38 14.8833303682 +26 11 39.971794234       20.33 17.84 M7e 51 0
17 V* GM Tau Or* 04 38 21.3390129259 +26 09 13.784439336     17.577   15.04 M6.5 94 0
18 2MASS J04390396+2544264 BD* 04 39 03.9603916514 +25 44 26.337817736       18.40 15.40 M7IVe 51 0
19 ITG 17 Y*O 04 39 47.4820305505 +26 01 40.693626234     21.556   15.78 M7 85 0
20 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3545 0
21 2MASS J04414825+2534304 BD* 04 41 48.2522895943 +25 34 30.569106360         17.03 M8e 47 0
22 2MASS J04422101+2520343 TT* 04 42 21.0213244177 +25 20 34.300467111 18.67         M5.1 45 0
23 IRAS S04414+2506 BD* 04 44 27.1421731772 +25 12 16.439761677           M7e 63 0
24 TWA 34 LM* 10 28 45.7990825931 -28 30 37.527196674       15.82   M5e 24 0
25 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1557 1
26 NAME TW Hya Association As* 11 01.9 -34 42           ~ 827 0
27 2MASS J11062554-7633418 Y*O 11 06 25.5204707067 -76 33 41.844129668     20.7   15.88 M5.25-6 30 0
28 NAME Cha I MoC 11 06 48 -77 18.0           ~ 986 1
29 OTS 44 Y*O 11 10 09.34392 -76 32 17.8512           M9.5+ 52 0
30 TWA 30B LM* 11 32 18.2184758367 -30 18 31.652412622         16.68 M4 33 0
31 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 694 0
32 TWA 32 ** 12 26 51.366576 -33 16 12.54324   17.21 16.00 15.73   M6.3 26 0
33 NAME Cha II MoC 12 54 -77.2           ~ 297 0
34 NAME Upper Sco Association As* 16 12 -23.4           ~ 1054 1
35 [GY92] 3 Y*O 16 26 21.9083577172 -24 44 39.720788042       17.95 15.62 M6.5 46 0
36 [GY92] 204 TT* 16 27 06.5924723987 -24 41 48.883697790       17.57 15.43 M5 83 0
37 BKLT J162737-241756 Y*O 16 27 37.4272403427 -24 17 54.955552302           M7.5 26 0
38 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3066 0

    Equat.    Gal    SGal    Ecl

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2020.10.28-06:51:20

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