2018A&A...617A.109O


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST02:47:57

2018A&A...617A.109O - Astronomy and Astrophysics, volume 617A, 109-109 (2018/9-1)

Resolving faint structures in the debris disk around TWA 7. Tentative detections of an outer belt, a spiral arm, and a dusty cloud.

OLOFSSON J., VAN HOLSTEIN R.G., BOCCALETTI A., JANSON M., THEBAULT P., GRATTON R., LAZZONI C., KRAL Q., BAYO A., CANOVAS H., CACERES C., GINSKI C., PINTE C., ASENSIO-TORRES R., CHAUVIN G., DESIDERA S., HENNING T., LANGLOIS M., MILLI J., SCHLIEDER J.E., SCHREIBER M.R., AUGEREAU J.-C., BONNEFOY M., BUENZLI E., BRANDNER W., DURKAN S., ENGLER N., FELDT M., GODOY N., GRADY C., HAGELBERG J., LAGRANGE A.-M., LANNIER J., LIGI R., MAIRE A.-L., MAWET D., MENARD F., MESA D., MOUILLET D., PERETTI S., PERROT C., SALTER G., SCHMIDT T., SISSA E., THALMANN C., VIGAN A., ABE L., FEAUTRIER P., LE MIGNANT D., MOULIN T., PAVLOV A., RABOU P., ROUSSET G. and ROUX A.

Abstract (from CDS):


Context. Debris disks are the intrinsic by-products of the star and planet formation processes. Most likely due to instrumental limitations and their natural faintness, little is known about debris disks around low mass stars, especially when it comes to spatially resolved observations.
Aims. We present new VLT/SPHERE IRDIS dual-polarization imaging (DPI) observations in which we detect the dust ring around the M2 spectral type star TWA 7. Combined with additional angular differential imaging observations we aim at a fine characterization of the debris disk and setting constraints on the presence of low-mass planets.
Methods. We modeled the SPHERE DPI observations and constrain the location of the small dust grains, as well as the spectral energy distribution of the debris disk, using the results inferred from the observations, and performed simple N-body simulations.
Results. We find that the dust density distribution peaks at ∼0.72'' (25au), with a very shallow outer power-law slope, and that the disk has an inclination of ∼13° with a position angle of ∼91° east of north. We also report low signal-to-noise ratio detections of an outer belt at a distance of ∼1.5'' (∼52au) from the star, of a spiral arm in the southern side of the star, and of a possible dusty clump at 0.11''. These findings seem to persist over timescales of at least a year. Using the intensity images, we do not detect any planets in the close vicinity of the star, but the sensitivity reaches Jovian planet mass upper limits. We find that the SED is best reproduced with an inner disk at ∼0.2'' (∼7au) and another belt at 0.72'' (25au).
Conclusions. We report the detections of several unexpected features in the disk around TWA 7. A yet undetected 100M planet with a semi-major axis at 20-30au could possibly explain the outer belt as well as the spiral arm. We conclude that stellar winds are unlikely to be responsible for the spiral arm.

Abstract Copyright: © ESO 2018

Journal keyword(s): circumstellar matter - instrumentation: high angular resolution - instrumentation: polarimeters

Simbad objects: 8

goto Full paper

goto View the reference in ADS

Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 61005 PM* 07 35 47.4624262763 -32 12 14.042600581   8.96 8.22     G8Vk 171 0
2 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 151 1
3 NAME TW Hya Association As* 11 01.9 -34 42           ~ 819 0
4 V* V1249 Cen TT* 12 15 30.7203284919 -39 48 42.605543199   13.09 11.160 10.919 9.50 M0.5 83 0
5 HD 107146 PM* 12 19 06.5022221429 +16 32 53.870713669   7.61   6.7   G2V 220 0
6 BD-07 4003 BY* 15 19 26.8271336166 -07 43 20.190958776 13.403 11.76 10.560 9.461 8.911 M3V 533 2
7 HD 141569 pr* 15 49 57.7484743862 -03 55 16.344023102 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 470 0
8 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 893 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018A&A...617A.109O and select 'bookmark this link' or equivalent in the popup menu


2020.07.08-02:47:57

© Université de Strasbourg/CNRS

    • Contact