2006ApJ...645..395S


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.29CET01:12:48

2006ApJ...645..395S - Astrophys. J., 645, 395-415 (2006/July-1)

Dust processing in disks around T Tauri stars.

SARGENT B., FORREST W.J., D'ALESSIO P., LI A., NAJITA J., WATSON D.M., CALVET N., FURLAN E., GREEN J.D., KIM K.H., SLOAN G.C., CHEN C.H., HARTMANN L. and HOUCK J.R.

Abstract (from CDS):

The 8-14 µm emission spectra of 12 T Tauri stars in the Taurus/Auriga dark clouds and in the TW Hydrae association obtained with the Infrared Spectrograph (IRS) on board Spitzer are analyzed. Assuming that the 10 µm features originate from silicate grains in the optically thin surface layers of T Tauri disks, the 8-14 µm dust emissivity for each object is derived from its Spitzer spectrum. The emissivities are fit with the opacities of laboratory analogs of cosmic dust. The fits include small nonspherical grains of amorphous silicates (pyroxene and olivine), crystalline silicates (forsterite and pyroxene), and quartz, together with large fluffy amorphous silicate grains. A wide range in the fraction of crystalline silicate grains, as well as large silicate grains among these stars, are found. The dust in the transitional-disk objects CoKu Tau/4, GM Aur, and DM Tau has the simplest form of silicates, with almost no hint of crystalline components and modest amounts of large grains. This indicates that the dust grains in these objects have been modified little from their origin in the interstellar medium. Other stars show various amounts of crystalline silicates, similar to the wide dispersion of the degree of crystallinity reported for Herbig Ae/Be stars of mass <2.5 M. Late spectral type, low-mass stars can have significant fractions of crystalline silicate grains. Higher quartz mass fractions often accompany low amorphous olivine to amorphous pyroxene ratios. Lower contrast of the 10 µm feature accompanies greater crystallinity.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Infrared: Stars - Stars: Pre-Main-Sequence

Simbad objects: 23

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Number of rows : 23

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 V* FM Tau Or* 04 14 13.5839505100 +28 12 49.166941548 14.44   13.80 13.64   M0/2e 193 0
2 V* FN Tau Or* 04 14 14.5943659839 +28 27 58.063377983     14.70 13.68   M5 144 0
3 V* CY Tau Or* 04 17 33.7281514373 +28 20 46.809969664 14.52 14.68 13.40 12.59   M1.5 236 0
4 2MASS J04181710+2828419 TT* 04 18 17.1091861192 +28 28 41.921033525     22.175     M6.4 75 0
5 V* IP Tau Or* 04 24 57.0823478325 +27 11 56.543062579   14.50   12.46   M0:Ve 196 0
6 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1234 0
7 [RRN96] GG Tau Bb TT* 04 32 30.28224 +17 31 30.3024           M6+M7.5 76 1
8 V* GG Tau Or* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 657 1
9 [RRN96] GG Tau b * 04 32 30.3478536425 +17 31 29.403551877           M7.5 24 1
10 V* DM Tau Or* 04 33 48.7335659850 +18 10 09.974471722 14.30 14.82 14.00     M2Ve 524 0
11 CoKu Tau-Aur Star 4 TT* 04 41 16.8106225314 +28 40 00.077173462   16.40 14.68 14.59   M1.5e 167 0
12 V* GM Aur Or* 04 55 10.9813656049 +30 21 59.375978047 14.59 14.22 13.10     K3Ve 560 0
13 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2031 1
14 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1486 1
15 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1571 1
16 NAME TW Hya Association As* 11 01.9 -34 42           ~ 830 0
17 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 201 0
18 TWA 3A TT* 11 10 27.9117558304 -37 31 51.529219753   14.04 12.57   9.10 M4Ve 190 0
19 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11831 0
20 GCS 3 IR 17 46 15 -28 49.6           ~ 52 0
21 * ksi Dra PM* 17 53 31.7296234 +56 52 21.514262 6.14 4.93 3.75 2.92 2.33 K2III 256 0
22 * mu. Cep s*r 21 43 30.4610574 +58 46 48.160181 8.85 6.43 4.08 1.98 0.22 M2-Ia 624 1
23 * alf Lac PM* 22 31 17.5013090 +50 16 56.968200 3.78 3.78 3.77 3.77 3.80 A1V 241 0

    Equat.    Gal    SGal    Ecl

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2020.11.29-01:12:48

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