2019ApJ...878L...8T


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.20CEST08:11:16

2019ApJ...878L...8T - Astrophys. J., 878, L8-L8 (2019/June-2)

Discovery of an au-scale excess in millimeter emission from the protoplanetary disk around TW Hya.

TSUKAGOSHI T., MUTO T., NOMURA H., KAWABE R., KANAGAWA K.D., OKUZUMI S., IDA S., WALSH C., MILLAR T.J., TAKAHASHI S.Z., HASHIMOTO J., UYAMA T. and TAMURA M.

Abstract (from CDS):

We report the detection of an excess in dust continuum emission at 233 GHz (1.3 mm in wavelength) in the protoplanetary disk (PPD) around TW Hya revealed through high-sensitivity observations at ∼3 au resolution with the Atacama Large Millimeter/submillimeter Array. The sensitivity of the 233 GHz image has been improved by a factor of 3 with regard to that of our previous cycle 3 observations. The overall structure is mostly axisymmetric, and there are apparent gaps at 25 and 41 au as previously reported. The most remarkable new finding is a few astronomical-unit-scale excess emission in the southwest part of the PPD. The excess emission is located at 52 au from the disk center and is 1.5 times brighter than the surrounding PPD at a significance of 12σ. We performed a visibility fitting to the extracted emission after subtracting the axisymmetric PPD emission and found that the inferred size and the total flux density of the excess emission are 4.4 x 1.0 au and 250 µJy, respectively. The dust mass of the excess emission corresponds to 0.03 M if a dust temperature of 18 K is assumed. Because the excess emission can also be marginally identified in the Band 7 image at almost the same position, the feature is unlikely to be a background source. The excess emission can be explained by a dust clump accumulated in a small elongated vortex or a massive circumplanetary disk around a Neptune-mass-forming planet.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): protoplanetary disks - stars: individual: TW Hya

Simbad objects: 12

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Number of rows : 12

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 HD 36112 Ae* 05 30 27.5286772598 +25 19 57.082162439   8.57 8.27     A8Ve 324 0
2 QSO B1034-293 QSO 10 37 16.07973476 -29 34 02.8133345   16.46 16.46 17.54   ~ 258 1
3 QSO J1051-3138 QSO 10 51 04.77752781 -31 38 14.3074730   18.5 19.4 19   ~ 46 1
4 4C 01.28 BLL 10 58 29.60520747 +01 33 58.8237691   18.74 18.28 16.68   ~ 618 2
5 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1443 1
6 CTS 10 Sy1 11 03 31.5267293120 -32 51 16.692763487   16.29 16.30 16.4   ~ 100 1
7 QSO B1104-445 QSO 11 07 08.6939954176 -44 49 07.617187122   17.84 18.2 17.37   ~ 171 1
8 CPD-36 6759 Y*O 15 15 48.4459023859 -37 09 16.026315179   9.21 8.708     F8V 328 1
9 HD 142527 Ae* 15 56 41.8888096574 -42 19 23.245384377   9.04 8.34     F6III 425 1
10 HD 143006 TT* 15 58 36.9127773803 -22 57 15.221492622   10.92 10.14     G5IVe 142 0
11 IRAS 16245-2423 TT* 16 27 37.1911764648 -24 30 35.031583716       16.66 14.67 B5-F2 222 0
12 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 729 0

    Equat.    Gal    SGal    Ecl

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2019.10.20-08:11:16

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