C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST07:15:08

2011A&A...528L...7H - Astronomy and Astrophysics, volume 528, L7-7 (2011/4-1)

A companion candidate in the gap of the T Chamaeleontis transitional disk.


Abstract (from CDS):

T Cha is a young star surrounded by a cold disk. The presence of a gap within its disk, inferred from fitting to the spectral energy distribution, has suggested on-going planetary formation. The aim of this work is to look for very low-mass companions within the disk gap of T Cha. We observed T Cha in L' and Ks with NAOS-CONICA, the adaptive optics system at the VLT, using sparse aperture masking. We detected a source in the L' data at a separation of 62±7mas, position angle of ∼78±1 degrees, and a contrast of ΔL'=5.1±0.2mag. The object is not detected in the Ks band data, which show a 3-σ contrast limit of 5.2mag at the position of the detected L' source. For a distance of 108pc, the detected companion candidate is located at 6.7AU from the primary, well within the disk gap. If T Cha and the companion candidate are bound, the comparison of the L' and Ks photometry with evolutionary tracks shows that the photometry is inconsistent with any unextincted photosphere at the age and distance of T Cha. The detected object shows a very red Ks-L' color, for which a possible explanation would be a significant amount of dust around it. This would imply that the companion candidate is young, which would strengthen the case for a physical companion, and moreover that the object would be in the substellar regime, according to the Ks upper limit. Another exciting possibility would be that this companion is a recently formed planet within the disk. Additional observations are mandatory to confirm that the object is bound and to properly characterize it.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: T Cha - brown dwarfs - instrumentation: adaptive optics - instrumentation: high angular resolution

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1272 1
2 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 306 0
3 HD 101251 * 11 37 49.2157490304 -79 14 31.610388374   10.36 8.87     K2III 7 0
4 HD 102260 * 11 45 13.8197550916 -78 36 58.636677761   9.78 8.66     K0III 10 0
5 V* T Cha Or* 11 57 13.5268556629 -79 21 31.521755129   10.00 11.86     K0e 234 1
6 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 120 1

    Equat.    Gal    SGal    Ecl

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