Discovery of an 86 AU Radius Debris Ring Around HD 181327

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dc.creatorSchneider, Glenn
dc.creatorSilverstone, Murray D.
dc.creatorHines, Dean C.
dc.creatorAugereau, Jean-Charles
dc.creatorPinte, Christophe
dc.creatorMenard, Francois
dc.creatorKrist, John
dc.creatorClampin, Mark
dc.creatorGrady, Carol
dc.creatorGolimowski, David
dc.creatorArdila, David
dc.creatorHenning, Thomas
dc.creatorWolf, Sebastian
dc.creatorRodmann, Jens
dc.date2006-06-08
dc.date.accessioned2026-07-07T10:39:15Z
dc.date.available2026-07-07T10:39:15Z
dc.descriptionHST/NICMOS PSF-subtracted coronagraphic observations of HD 181327 have revealed the presence of a ring-like disk of circumstellar debris seen in 1.1 micron light scattered by the disk grains, surrounded by a di use outer region of lower surface brightness. The annular disk appears to be inclined by 31.7 +/- 1.6 deg from face on with the disk major axis PA at 107 +/-2 deg . The total 1.1 micron flux density of the light scattered by the disk (at 1.2" < r < 5.0") of 9.6 mJy +/- 0.8 mJy is 0.17% +/- 0.015% of the starlight. Seventy percent of the light from the scattering grains appears to be confined in a 36 AU wide annulus centered on the peak of the radial surface brightness (SB) profile 86.3 +/- 3.9 AU from the star, well beyond the characteristic radius of thermal emission estimated from IRAS and Spitzer flux densities assuming blackbody grains (~ 22 AU). The light scattered by the ring appears bilaterally symmetric, exhibits directionally preferential scattering well represented by a Henyey-Greenstein scattering phase function with g = 0.30 +/- 0.03, and has an azimuthally medianed SB at the 86.3 AU radius of peak SB of 1.00 +/- 0.07 mJy arcsec^-2. No photocentric offset is seen in the ring relative to the position of the central star. A low surface brightness diffuse halo is seen in the NICMOS image to a distance of ~ 4" Deeper 0.6 micron HST/ACS PSF-subtracted coronagraphic observations reveal a faint outer nebulosity, asymmetrically brighter to the North of the star. We discuss models of the disk and properties of its grains, from which we infer a maximum vertical scale height of 4 - 8 AU at the 87.6 AU radius of maximum surface density, and a total maximum dust mass of collisionally replenished grains with minimum grain sizes of ~ 1 micron of ~ 4 M(moon).
dc.description45 pages, 15 figures, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0606213
dc.identifierhttp://arxiv.org/abs/astro-ph/0606213
dc.identifierAstrophys.J.650:414-431,2006
dc.identifierdoi:10.1086/506507
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180961
dc.subjectAstrophysics
dc.titleDiscovery of an 86 AU Radius Debris Ring Around HD 181327
dc.typetext

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