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

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dc.contributor.authorClose Olofsson J.
dc.contributor.authorVan Holstein R.G.
dc.contributor.authorBoccaletti A.
dc.contributor.authorJanson M.
dc.contributor.authorThébault P.
dc.contributor.authorGratton R.
dc.contributor.authorLazzoni C.
dc.contributor.authorKral Q.
dc.contributor.authorBayo A.
dc.contributor.authorCanovas H.
dc.contributor.authorCáceres C.
dc.contributor.authorGinski C.
dc.contributor.authorPinte C.l.
dc.contributor.authorAsensio-Torres R.
dc.contributor.authorChauvin G.l.
dc.contributor.authorDesidera S.
dc.contributor.authorHenning, Th.
dc.contributor.authorLanglois M.
dc.contributor.authorMilli J.
dc.contributor.authorSchlieder J.E.
dc.contributor.authorSchreiber M.R.
dc.contributor.authorAugereau J.-C.I.
dc.contributor.authorBonnefoy M.l.
dc.contributor.authorBuenzli E.
dc.contributor.authorBrandner W.
dc.contributor.authorDurkan S.
dc.contributor.authorEngler N.
dc.contributor.authorFeldt M.
dc.contributor.authorGodoy N.
dc.contributor.authorGrady C.
dc.contributor.authorHagelberg J.
dc.contributor.authorLagrange A.-M.
dc.contributor.authorLannier J.l.
dc.contributor.authorMaire A.-L.
dc.contributor.authorMawet D.
dc.contributor.authorMénard F.
dc.contributor.authorMesa D.
dc.contributor.authorMouillet D.l.
dc.contributor.authorPeretti S.
dc.contributor.authorPerrot C.
dc.contributor.authorSalter G.
dc.contributor.authorSchmidt T.
dc.contributor.authorSissa E.
dc.contributor.authorThalmann C.
dc.contributor.authorVigan A.
dc.contributor.authorFeautrier P.I.
dc.contributor.authorLe Mignant D.
dc.contributor.authorMoulin T.l.
dc.contributor.authorPavlov A.
dc.contributor.authorRabou P.l.
dc.contributor.authorRousset G.
dc.contributor.authorRoux A.l.
dc.contributor.authorLigi R.
dc.contributor.authorAbe L.
dc.date.accessioned2022-07-07T22:42:33Z
dc.date.available2022-07-07T22:42:33Z
dc.date.issued2018-09
dc.descriptionIndexación Scopuses
dc.description.abstractContext. 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′′ (25 au), 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′′ (∼52 au) 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′′ (∼7 au) and another belt at 0.72′′ (25 au). 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 20-30 au 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. © 2018 ESO.es
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2018/09/aa32583-18/aa32583-18.html
dc.identifier.citationAstronomy and Astrophysics Volume 6171 September 2018 Article number A109es
dc.identifier.doi10.1051/0004-6361/201832583
dc.identifier.issn00046361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/23213
dc.language.isoenes
dc.publisherEDP Scienceses
dc.rights.licenseCC BY 4.0
dc.subjectExoplanetses
dc.subjectPlanetes
dc.subjectGrain Dustes
dc.subjectInstrumentation: high angular resolutiones
dc.subjectCircumstellar matteres
dc.titleResolving faint structures in the debris disk around TWA 7: Tentative detections of an outer belt, a spiral arm, and a dusty cloudes
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