2015A&A...577A..11M


Query : 2015A&A...577A..11M

2015A&A...577A..11M - Astronomy and Astrophysics, volume 577A, 11-11 (2015/5-1)

CSI 2264: Probing the inner disks of AA Tauri-like systems in NGC 2264.

McGINNIS P.T., ALENCAR S.H.P., GUIMARAES M.M., SOUSA A.P., STAUFFER J., BOUVIER J., REBULL L., FONSECA N.N.J., VENUTI L., HILLENBRAND L., CODY A.M., TEIXEIRA P.S., AIGRAIN S., FAVATA F., FURESZ G., VRBA F.J., FLACCOMIO E., TURNER N.J., GAMEIRO J.F., DOUGADOS C., HERBST W., MORALES-CALDERON M. and MICELA G.

Abstract (from CDS):

The classical T Tauri star (CTTS) AA Tau has presented photometric variability that was attributed to an inner disk warp, caused by the interaction between the inner disk and an inclined magnetosphere. Previous studies of the young cluster NGC 2264 have shown that similar photometric behavior is common among CTTS. The goal of this work is to investigate the main causes of the observed photometric variability of CTTS in NGC 2264 that present AA Tau-like light curves, and verify if an inner disk warp could be responsible for their observed variability. In order to understand the mechanism causing these stars' photometric behavior, we investigate veiling variability in their spectra and u-r color variations and estimate parameters of the inner disk warp using an occultation model proposed for AA Tau. We also compare infrared Spitzer IRAC and optical CoRoT light curves to analyze the dust responsible for the occultations. AA Tau-like variability proved to be transient on a timescale of a few years. We ascribe this variability to stable accretion regimes and aperiodic variability to unstable accretion regimes and show that a transition, and even coexistence, between the two is common. We find evidence of hot spots associated with occultations, indicating that the occulting structures could be located at the base of accretion columns. We find average values of warp maximum height of 0.23 times its radial location, consistent with AA Tau, with variations of on average 11% between rotation cycles. We also show that extinction laws in the inner disk indicate the presence of grains larger than interstellar grains. The inner disk warp scenario is consistent with observations for all but one star with AA Tau-like variability in our sample. AA Tau-like systems are fairly common, comprising 14% of CTTS observed in NGC 2264, though this number increases to 35% among systems of mass 0.7M≲M≲2.0M. Assuming random inclinations, we estimate that nearly all systems in this mass range likely possess an inner disk warp. We attribute this to a possible change in magnetic field configurations among stars of lower mass.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: pre-main sequence - techniques: photometric - techniques: spectroscopic

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* AA Tau Or* 04 34 55.4201902392 +24 28 53.033624580 13.14 13.34 12.20     K5Ve 684 0
2 V* UX Ori Ae* 05 04 29.9878898040 -03 47 14.286732072 10.25 10.93 8.70 9.62 9.43 A4IVe 351 1
3 2MASS J06390355+0916159 TT* 06 39 03.5507495232 +09 16 15.970481760       15.34   M3.5 7 0
4 ESO-HA 325 TT* 06 39 03.7491751200 +09 40 23.376524124   16.98   15.26   ~ 11 0
5 ESO-HA 329 TT* 06 39 09.9571709928 +10 05 12.790130928   18.51   16.95   K7:M1 7 0
6 V* QT Mon SB* 06 39 34.4020554384 +09 54 51.093806796     16.64 15.63 14.228 M1.5: 27 0
7 V* KV Mon Or* 06 39 41.4666989448 +09 46 19.630421688 16.54 15.77 14.65 14.05 13.49 K3e 40 0
8 V* QW Mon Or* 06 39 59.2418495304 +09 27 24.523012188     16.34 15.90 14.68 ~ 25 0
9 Cl* NGC 2264 SBL 79 TT* 06 40 22.6245215208 +09 49 46.261785036 19.413 18.56 17.23 16.2 15.12 M0 29 0
10 V* KX Mon TT* 06 40 23.0840493144 +09 27 42.391108332 16.58 16.8 15.72 14.9 14.17 K6 35 0
11 V* NT Mon TT* 06 40 30.8558534064 +09 34 40.582681176 17.56 17.08 15.86 14.91 14.06 K1e 54 0
12 V* NU Mon TT* 06 40 36.5302620744 +09 50 45.672286128 17.88 18.12 16.92 15.9 14.59 M0.8 40 0
13 V* NV Mon TT* 06 40 37.8654419808 +09 34 54.077163708 18.689 17.913 16.492 15.63 14.293 M3e 41 0
14 V* LQ Mon TT* 06 40 43.2158542128 +09 47 07.243136772 17.403 17.29 15.84 14.91 13.97 K6 50 0
15 ESO-HA 399 TT* 06 40 44.5898682264 +09 32 26.171210580   19.65 18.29 17.23 15.61 M3e 28 0
16 EM* LkHA 364 TT* 06 40 45.1638228528 +09 28 44.402128932 15.82 15.25 14.2 13.59 13.03 K2 40 0
17 V* LR Mon TT* 06 40 47.5029437145 +09 49 28.939007949 15.52 15.09 13.98 13.29 12.61 K3e 70 0
18 EM* LkHA 31 TT* 06 40 50.5906149192 +09 54 57.310885296 16.71 16.07 14.9 14.16 13.47 K2e 43 0
19 EM* LkHA 33 TT* 06 40 51.5429401920 +09 43 24.229130664 16.31 15.69 14.51 13.85 13.22 K4 52 0
20 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1693 0
21 V* V603 Mon TT* 06 40 57.8384372520 +09 41 20.164429608 18.21 17.73 16.27 15.27 14.23 M0 37 0
22 ESO-HA 442 TT* 06 40 58.0966980264 +09 36 53.346541644   19.19 18.05 17.22 15.21 M2 26 0
23 V* IO Mon TT* 06 40 58.836576 +09 30 57.26412   15.30 14.04 13.11 12.49 K2/3e 61 0
24 NGC 2264 134 TT* 06 40 59.3436338472 +09 55 20.165321712 13.918 13.22 12.38 11.908 11.47 G5V 54 0
25 KHA 105 TT* 06 40 59.4862874672 +09 29 51.703405671 18.01 18.2 16.91 15.88 14.64 M3e 25 0
26 V* V422 Mon TT* 06 41 00.5019115560 +09 45 03.117313944 17.15 16.58 15.35 14.74 14.00 K4V 44 0
27 V* V354 Mon TT* 06 41 00.5100986520 +09 29 15.955881864 16.81 15.94 14.73 14.04 13.34 K4e 49 0
28 V* V356 Mon TT* 06 41 01.1161270656 +09 34 52.201148160 19.194 17.872 16.464 15.56 14.71 M1 40 0
29 V* V355 Mon TT* 06 41 01.8485008512 +09 38 41.135469000 16.46 15.68 14.54 13.9 13.20 K4e 33 0
30 V* GR Mon TT* 06 41 04.9630762874 +09 50 46.030021088 16.09 15.47 14.43 13.78 13.15 K2 43 0
31 ESO-HA 491 TT* 06 41 06.7296435792 +09 47 27.581327304     18.222 16.991 15.493 M3 31 0
32 ESO-HA 516 TT* 06 41 14.75400 +09 34 13.4724   19.24 17.87 16.88 15.61 K8/M0e 27 0
33 EM* LkHA 64 TT* 06 41 15.1141083360 +09 26 44.387646216 18.12 17.93 16.66 15.6 14.48 M0.5e 36 0
34 ESO-HA 528 SB* 06 41 25.6230226152 +09 34 43.009297284 18.14 17.49 16.03 15.31 14.37 M0 40 0
35 NGC 2264 213 TT* 06 41 28.7798173944 +09 38 38.946253632 15.61 15.03 14.03 13.46 12.89 K3 41 0
36 Cl* NGC 2264 RMS 4820 TT* 06 41 53.1599373000 +09 50 47.398640856     15.482 15.07 14.11 K5 36 0
37 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 174 1
38 EM* SR 9 Or* 16 27 40.2857881416 -24 22 04.130226300   12.91 11.533 11.11 10.00 K5e 269 0
39 NAME Ori Arm PoG ~ ~           ~ 191 0

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2022.08.15-14:38:59

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