REVEALING THE STRUCTURE OF A PRE-TRANSITIONAL DISK: THE CASE OF THE HERBIG F STAR SAO 206462 (HD 135344B)

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dc.contributor.authorGrady, C. A.
dc.contributor.authorSchneider, G.
dc.contributor.authorSitko, M. L.
dc.contributor.authorWilliger, G. M.
dc.contributor.authorHamaguchi, K.
dc.contributor.authorBrittain, S. D.
dc.contributor.authorAblordeppey, K.
dc.contributor.authorApai, D.
dc.contributor.authorBeerman, L.
dc.contributor.authorCarpenter, W. J.
dc.contributor.authorCollins, K. A.
dc.contributor.authorFukagawa, M.
dc.contributor.authorHammel, H. B.
dc.contributor.authorHenning, Th.
dc.contributor.authorHines, D.
dc.contributor.authorKimes, R.
dc.contributor.authorLynch, D. K.
dc.contributor.authorMenard, F.
dc.contributor.authorPearson, R.
dc.contributor.authorRussell, R. W.
dc.contributor.authorSilverstone, M.
dc.contributor.authorSmith, P. S.
dc.contributor.authorTroutman, M.
dc.contributor.authorWilner, D.
dc.contributor.authorWoodgate, B.
dc.contributor.authorClampin, M.
dc.contributor.otherEureka Scientific
dc.contributor.otherNational Aeronautics & Space Administration (NASA)
dc.contributor.otherNASA Goddard Space Flight Center
dc.contributor.otherUniversity of Arizona
dc.contributor.otherUniversity System of Ohio
dc.contributor.otherUniversity of Cincinnati
dc.contributor.otherUniversity of Louisville
dc.contributor.otherJohns Hopkins University
dc.contributor.otherCatholic University of America
dc.contributor.otherUniversity System of Maryland
dc.contributor.otherUniversity of Maryland Baltimore County
dc.contributor.otherClemson University
dc.contributor.otherOsaka University
dc.contributor.otherMax Planck Society
dc.contributor.otherAerospace Corporation - USA
dc.contributor.otherCentre National de la Recherche Scientifique (CNRS)
dc.contributor.otherUDICE-French Research Universities
dc.contributor.otherCommunaute Universite Grenoble Alpes
dc.contributor.otherUniversite Grenoble Alpes (UGA)
dc.contributor.otherHarvard University
dc.contributor.otherSmithsonian Astrophysical Observatory
dc.contributor.otherSmithsonian Institution
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2019-06-11T21:31:21Z
dc.date.available2019-06-11T21:31:21Z
dc.date.copyright2009
dc.date.issued2009-07-10
dc.description.abstractSAO 206462 (HD 135344B) has previously been identified as a Herbig F star with a circumstellar disk with a dip in its infrared excess near 10 mu m. In combination with a low accretion rate estimated from Br gamma, it may represent a gapped, but otherwise primordial or "pre-transitional" disk. We test this hypothesis with Hubble Space Telescope coronagraphic imagery, FUV spectroscopy and imagery and archival X-ray data, and spectral energy distribution (SED) modeling constrained by the observed system inclination, disk outer radius, and outer disk radial surface brightness (SB) profile using the Whitney Monte Carlo Radiative Transfer Code. The essentially face-on (i less than or similar to 20 degrees) disk is detected in scattered light from 0 ''.4 to 1 ''.15 (56-160 AU), with a steep (r(-9.6)) radial SB profile from 0.'' 6 to 0.'' 93. Fitting the SB data requires a concave upward or anti-flared outer disk, indicating substantial dust grain growth and settling by 8 +/- 4 Myr. The warm dust component is significantly variable in near to mid-IR excess and in temperature. At its warmest, it appears confined to a narrow belt from 0.08 to 0.2 AU. The steep SED for this dust component is consistent with grains with a <= 2.5 mu m. For cosmic carbon to silicate dust composition, conspicuous 10 mu m silicate emission would be expected and is not observed. This may indicate an elevated carbon to silicate ratio for the warm dust, which is not required to fit the outer disk. At its coolest, the warm dust can be fit with a disk from 0.14 to 0.31 AU, but with a higher inclination than either the outer disk or the gaseous disk, providing confirmation of the high inclination inferred from mid-IR interferometry. In tandem, the compositional and inclination difference between the warm dust and the outer dust disk suggests that the warm dust may be of second-generation origin, rather than a remnant of a primordial disk component. With its near face-on inclination, SAO 206462's disk is a prime location for planet searches.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationGrady, C.A., et al. (2009): Revealing the Structure of a Pre-Transitional Disk: The Case of the Herbig F Star SAO 206462 (HD 135344B). The Astronomical Journal, 699(2). DOI: http://dx.doi.org/10.1088/0004-637X/699/2/1822
dc.identifier.doi10.1088/0004-637X/699/2/1822
dc.identifier.orcidhttps://orcid.org/0000-0001-5638-1330
dc.identifier.orcidhttps://orcid.org/0000-0002-1493-300X
dc.identifier.orcidhttps://orcid.org/0000-0003-1526-7587
dc.identifier.orcidhttps://orcid.org/0000-0002-1329-1594
dc.identifier.orcidhttps://orcid.org/0000-0003-1117-9213
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5726
dc.languageEnglish
dc.language.isoen_US
dc.publisherIOP Publishing
dc.rights.holderAmerican Astronomical Society
dc.subjectplanetary systems: protoplanetary disks
dc.subjectstars: individual (SAO 206462)
dc.subjectT-TAURI STARS
dc.subject2-DIMENSIONAL RADIATIVE-TRANSFER
dc.subjectSPECTRAL ENERGY-DISTRIBUTIONS
dc.subjectMULTIBAND IMAGING PHOTOMETER
dc.subjectPRE-MAIN-SEQUENCE
dc.subjectX-RAY-EMISSION
dc.subjectHIGH-RESOLUTION SPECTROSCOPY
dc.subjectINTERMEDIATE-MASS STARS
dc.subjectSPITZER-IRS SPECTRA
dc.subjectVEGA-LIKE STARS
dc.subjectAstronomy & Astrophysics
dc.titleREVEALING THE STRUCTURE OF A PRE-TRANSITIONAL DISK: THE CASE OF THE HERBIG F STAR SAO 206462 (HD 135344B)en_US
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dc.typeArticle

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