2006A&A...460L..43P


Query : 2006A&A...460L..43P

2006A&A...460L..43P - Astronomy and Astrophysics, volume 460, L43-47 (2006/12-4)

Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths.

PIETU V., DUTREY A., GUILLOTEAU S., CHAPILLON E. and PETY J.

Abstract (from CDS):

We constrain the dust distribution and its properties (temperature, emissivity) in inner proto-planetary disks We performed sub-arcsecond high-sensitivity interferometric observations of the thermal dust emission at 1.4mm and 2.8mm in the disks surrounding LkCa15 and MWC480, with the new 750 m baselines of the IRAM PdBI array. This provides a linear resolution of ∼60AU at the distance of Taurus. We report the existence of a cavity of ∼50AU radius in the inner disk of LkCa15. Whereas LkCa15 emission is optically thin, the optically thick core of MWC480 is resolved at 1.4 mm with a radius of ∼35AU, constraining the dust temperature. In MWC480, the dust emission is coming from a colder layer than the CO emission, most likely the disk mid-plane. These observations provide direct evidence of an inner cavity around LkCa15. Such a cavity most probably results from the tidal disturbance created by a low-mass companion or large planet at ∼30AU from the star. These results suggest that planetary system formation is already at work in LkCa15. They also indicate that the classical steady-state viscous disk model is too simplistic a description of the inner 50AU of ``proto-planetary'' disks and that the disk evolution is coupled to the planet formation process. The MWC480 results indicate that a proper estimate of the dust temperature and size of the optically thick core are essential for determining the dust emissivity index β.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - planetary systems: protoplanetary disks - stars: individual: LkCa15 - stars: individual: MWC480 - radio-continuum: stars

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 911 1
2 V* GG Tau Or* 04 32 30.3506925552 +17 31 40.494063144 14.84 14.78 13.40 11.54   M0e+M2.0e 710 1
3 EM* LkCa 15 Or* 04 39 17.7911622816 +22 21 03.390090984   13.01 12.03 11.61   K5:Ve 634 1
4 V* GM Aur Or* 04 55 10.9815576936 +30 21 59.373771876 14.59 13.351 12.242 11.798   K3Ve 639 0
5 V* AB Aur Ae* 04 55 45.8458932216 +30 33 04.292077032 7.20 7.16 7.05 6.96 6.70 A0Ve 1014 2
6 HD 31648 Ae* 04 58 46.2655706952 +29 50 36.987625680 7.84 7.78 7.62 7.76 7.43 A5Vep 475 0
7 QSO J0530+13 Bla 05 30 56.41674741 +13 31 55.1494688     20.0 19.35   ~ 926 1
8 HD 141569 Y*O 15 49 57.7482550392 -03 55 16.341617064 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 512 0
9 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 772 0

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2023.02.09-07:54:38

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