2015A&A...583A..66H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST19:51:23

2015A&A...583A..66H - Astronomy and Astrophysics, volume 583A, 66-66 (2015/11-1)

Probing the final stages of protoplanetary disk evolution with ALMA.

HARDY A., CACERES C., SCHREIBER M.R., CIEZA L., ALEXANDER R.D., CANOVAS H., WILLIAMS J.P., WAHHAJ Z. and MENARD F.

Abstract (from CDS):

The evolution of a circumstellar disk from its gas-rich protoplanetary stage to its gas-poor debris stage is not understood well. It is apparent that disk clearing progresses from the inside-out on a short time scale and models of photoevaporation are frequently used to explain this. However, the photoevaporation rates predicted by recent models differ by up to two orders of magnitude, resulting in uncertain time scales for the final stages of disk clearing. Photoevaporation theories predict that the final stages of disk-clearing progress in objects that have ceased accretion but still posses considerable material at radii far from the star. Weak-line T Tauri stars (WTTS) with infrared emission in excess of what is expected from the stellar photosphere are likely in this configuration. We aim to provide observational constraints on theories of disk-clearing by measuring the dust masses and CO content of a sample of young (1.8-26.3Myr) WTTS. We used ALMA Band 6 to obtain continuum and 12CO(2-1) line fluxes for a sample of 24 WTTS stars with known infrared excess. For these WTTS, we inferred the dust mass from the continuum observations and derived disk luminosities and ages to allow comparison with previously detected WTTS. We detect continuum emission in only four of 24 WTTS, and no 12CO(2-1) emission in any of them. For those WTTS where no continuum was detected, their ages and derived upper limits suggest they are debris disks, which makes them some of the youngest debris disks known. Of those where continuum was detected, three are possible photoevaporating disks, although the lack of CO detection suggests a severely reduced gas-to-dust ratio. The low fraction of continuum detections implies that, once accretion onto the star stops, the clearing of the majority of dust progresses very rapidly. Most WTTS with infrared excess are likely not in transition but are instead young debris disks, whose dust is either primordial and has survived disk-clearing, or is of second-generation origin. In the latter case, the presence of giant planets within these WTTS might be the cause.

Abstract Copyright:

Journal keyword(s): protoplanetary disks - planets and satellites: formation - planet-disk interactions - radio continuum: planetary systems - radio lines: planetary systems - infrared: planetary systems

Simbad objects: 41

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Number of rows : 41

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 HD 21997 PM* 03 31 53.6468412720 -25 36 50.936416301   6.501 6.372   6.25 A3IV/V 125 0
2 2MASS J04182147+1658470 TT* 04 18 21.4747288784 +16 58 46.997648983   14.37 13.26     K5 49 0
3 WK81 1 TT* 04 19 26.2671630797 +28 26 14.259129093   14.81   12.240   K7 193 1
4 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1054 3
5 [XCR2012] TrES J042423+265008 V* 04 24 23.2123188460 +26 50 08.361912098       14.48   M3 10 0
6 V* FW Tau Or* 04 29 29.703744 +26 16 53.06412       15.85   M5.5 116 0
7 [XCR2012] TrES J043145+285909 V* 04 31 45.0464562109 +28 59 08.127592322       13.32   F0 6 0
8 V* V1321 Tau TT* 04 32 53.2359649386 +17 35 33.645694399     13.69     M2 42 0
9 HD 282276 Y*O 04 33 04.2284288214 +29 21 49.836839034   11.04 10.37 9.96   B8 11 0
10 HD 283759 Y*O 04 36 49.1226969998 +24 12 58.874341377   11.0 10.4 10.01   F2 29 0
11 2MASS J04403979+2519061 Y*O 04 40 39.7866478727 +25 19 06.166523054           M5e 27 0
12 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3479 0
13 V* V999 Tau Or* 04 42 05.4896906880 +25 22 56.226737601 18.68 15.1 14.7     M0.6 73 0
14 QSO B0507+179 QSO 05 10 02.36912982 +18 00 41.5816534   20.0 19.0 19.09   ~ 313 1
15 QSO J0635-7516 QSO 06 35 46.5080299 -75 16 16.815501   15.96 15.75 15.82   ~ 508 1
16 V* EH Cha Or* 08 41 37.0153250643 -79 03 30.542210498     14.4     M3 46 0
17 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 306 0
18 V* EI Cha Or* 08 42 23.7597511980 -79 04 02.974504684     12.7     K7 50 0
19 NAME Cha I MoC 11 06 48 -77 18.0           ~ 968 1
20 QSO B1104-445 QSO 11 07 08.6939954176 -44 49 07.617187122   17.84 18.2 17.37   ~ 187 1
21 CHXR 76 Or* 11 07 35.1777230466 -77 34 49.293344749   20.04 18.15   14.39 M4e 41 0
22 Ass Cha T 2-54 TT* 11 12 42.6696152636 -77 22 22.928829312     11.103   9.653 G8+K7 79 2
23 NAME Lupus I Cld 15 43 02.1 -34 09 06           ~ 224 0
24 2MASS J16002612-4153553 Y*O 16 00 26.1203643851 -41 53 55.381248967   16.57 16.45 15.70 13.80 M5.25 23 0
25 V* MZ Lup TT* 16 01 08.9697537283 -33 20 14.179282859 12.11 11.88 10.88 10.35 9.812 G5IVe 27 0
26 V* NO Lup TT* 16 03 11.8109703813 -32 39 20.284249713 15.13 14.25 12.864 12.14 11.149 K7 19 0
27 NAME Lupus IV MoC 16 03 12.4 -42 07 43           ~ 125 0
28 Sz 112 Y*O 16 08 55.5292331003 -39 02 33.939799154   16.62 15.39 14.78 12.93 M6 53 0
29 NAME Lupus III SFR 16 09.6 -39 03           ~ 271 0
30 UCAC2 24372422 ** 16 12 41.1606982838 -19 24 18.557030928       12.85   ~ 11 0
31 2MASS J16220961-1953005 Y*O 16 22 09.6135554521 -19 53 00.755873937       14.27   M3.7 14 0
32 2MASS J16223757-2345508 TT* 16 22 37.5361452134 -23 45 50.416161409     16.04 14.45 12.98 ~ 12 0
33 2MASS J16251469-2456069 TT* 16 25 14.7078336822 -24 56 07.069271136     14.41 13.05 11.75 K7 17 0
34 QSO B1622-253 QSO 16 25 46.89164010 -25 27 38.3267989   21.3 20.6 19.60   ~ 301 1
35 WLY 2-55 TT* 16 27 52.0863419872 -24 40 50.713643148     16.28 14.48 12.78 K7.5 79 0
36 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0
37 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78 17.39 ~ 983 1
38 2MASS J19002906-3656036 Y*O 19 00 29.0664450984 -36 56 03.614124177   17.15 15.68 13.78   M4 15 0
39 2MASS J19012901-3701484 Y*O 19 01 29.0324931845 -37 01 48.520870032           M3.75 15 0
40 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 394 0
41 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 689 0

    Equat.    Gal    SGal    Ecl

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2020.07.11-19:51:23

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