2011A&A...528L...6O


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST08:25:26

2011A&A...528L...6O - Astronomy and Astrophysics, volume 528, L6-6 (2011/4-1)

Warm dust resolved in the cold disk around T Chamaeleontis with VLTI/AMBER.

OLOFSSON J., BENISTY M., AUGEREAU J.-C., PINTE C., MENARD F., TATULLI E., BERGER J.-P., MALBET F., MERIN B., VAN DISHOECK E.F., LACOUR S., PONTOPPIDAN K.M., MONIN J.-L., BROWN J.M. and BLAKE G.A.

Abstract (from CDS):

The transition between massive Class II circumstellar disks and Class III debris disks, with dust residuals, has not yet been clearly understood. Disks are expected to dissipate with time, and dust clearing in the inner regions can be the consequence of several mechanisms. Planetary formation is one of them that will possibly open a gap inside the disk. According to recent models based on photometric observations, T Cha is expected to present a large gap within its disk, meaning that an inner dusty disk is supposed to have survived close to the star. We investigate this scenario with new near-infrared interferometric observations. We observed T Cha in the H and K bands using the AMBER instrument at VLTI and used the MCFOST radiative transfer code to model the SED of T Cha and the interferometric observations simultaneously and to test the scenario of an inner dusty structure. We also used a toy model of a binary to check that a companion close to the star can reproduce our observations. The scenario of a close (few mas) companion cannot satisfactorily reproduce the visibilities and SED, while a disk model with a large gap and an inner ring producing the bulk of the emission (in H and K-bands) close to 0.1AU is able to account for all the observations. With this study, the presence of an optically thick inner dusty disk close to the star and dominating the H and K-bands emission is confirmed. According to our model, the large gap extends up to ∼7.5AU. This points toward a companion (located at several AU) gap-opening scenario to explain the morphology of T Cha.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: evolution - protoplanetary disks - circumstellar matter - infrared: stars - techniques: interferometric

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 CoKu Tau-Aur Star 4 TT* 04 41 16.8106225314 +28 40 00.077173462   16.40 14.68 14.59   M1.5e 164 0
2 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 612 1
3 V* T Cha Or* 11 57 13.5268556629 -79 21 31.521755129   10.00 11.86     K0e 222 1
4 HD 107145 PM* 12 19 45.4061661090 -76 48 03.665164962   7.275 6.837     F5IV/V 33 0

    Equat.    Gal    SGal    Ecl

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2019.10.21-08:25:26

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