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

被引：56

作者：

Grady, C. A. ^{[1
,2
]}

Schneider, G. ^{[4
]}

Sitko, M. L. ^{[5
,6
]}

Williger, G. M. ^{[7
,8
,9
]}

Hamaguchi, K. ^{[3
,10
,11
]}

Brittain, S. D. ^{[12
]}

Ablordeppey, K. ^{[6
]}

Apai, D. ^{[4
]}

Beerman, L. ^{[6
]}

Carpenter, W. J. ^{[6
]}

Collins, K. A. ^{[7
]}

Fukagawa, M. ^{[13
]}

Hammel, H. B. ^{[5
]}

Henning, Th. ^{[14
]}

Hines, D. ^{[5
]}

Kimes, R. ^{[6
]}

Lynch, D. K. ^{[15
]}

Menard, F. ^{[16
]}

Pearson, R. ^{[15
]}

Russell, R. W. ^{[15
]}

Silverstone, M. ^{[1
]}

Smith, P. S. ^{[4
]}

Troutman, M. ^{[12
]}

Wilner, D. ^{[17
]}

Woodgate, B. ^{[2
,3
]}

Clampin, M. ^{[2
]}

机构：

[1] Eureka Sci, Oakland, CA 96002 USA

[2] NASA, Goddard Space Flight Ctr, ExoPlanets & Stellar Astrophys Lab, Greenbelt, MD 20771 USA

[3] NASA, Goddard Space Flight Ctr, Goddard Ctr Astrobiol, Greenbelt, MD 20771 USA

[4] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[5] Space Sci Inst, Boulder, CO 80301 USA

[6] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA

[7] Univ Louisville, Dept Phys, Louisville, KY 40292 USA

[8] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[9] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA

[10] NASA, Goddard Space Flight Ctr, CRESST, Xray Astrophys Lab, Greenbelt, MD 20771 USA

[11] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA

[12] Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA

[13] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan

[14] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[15] Aerosp Corp, Los Angeles, CA 90009 USA

[16] CNRS UJF, Lab Astrophys Grenoble, UMR 5571, Grenoble, France

[17] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 699卷 / 02期

关键词：

planetary systems: protoplanetary disks; stars: individual (SAO 206462); T-TAURI STARS; 2-DIMENSIONAL RADIATIVE-TRANSFER; SPECTRAL ENERGY-DISTRIBUTIONS; MULTIBAND IMAGING PHOTOMETER; PRE-MAIN-SEQUENCE; X-RAY-EMISSION; HIGH-RESOLUTION SPECTROSCOPY; INTERMEDIATE-MASS STARS; SPITZER-IRS SPECTRA; VEGA-LIKE STARS;

D O I：

10.1088/0004-637X/699/2/1822

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

SAO 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.

引用

页码：1822 / 1842

页数：21

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