Discovery of a Nearly Edge-on Disk around HD 32297 | Zendy

Glenn Schneider | Zendy; M. D. Silverstone | Zendy; Dean C. Hines | Zendy

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Discovery of a Nearly Edge-on Disk around HD 32297

Author(s) -

Glenn Schneider,

M. D. Silverstone,

Dean C. Hines

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/452631

Subject(s) - physics , astrophysics , starlight , surface brightness , radius , brightness , astronomy , thick disk , stars , halo , computer security , galaxy , computer science

We report the discovery of a nearly edge-on disk about the A0 star HD 32297seen in light scattered by the disk grains revealed in NICMOS PSF-subtractedcoronagraphic images. The disk extends to a distance of at least 400 AU (3.3")along its major axis with a 1.1 micron flux density of 4.81 +/-0.57 mJy beyonda radius of 0.3" from the coronagraphically occulted star. The fraction of 1.1micron starlight scattered by the disk, 0.0033 +/- 0.0004, is comparable to itsfractional excess emission at 25 + 60 micron of ~ 0.0027 as measured from IRASdata. The disk appears to be inclined 10.5 degrees +/- 2.5 degrees from anedge-on viewing geometry, with its major axis oriented 236.5 degrees +/- 1degree eastward of north. The disk exhibits unequal brightness in opposingsides and a break in the surface brightness profile along NE-side disk majoraxis. Such asymmetries might implicate the existence of one or more (unseen)planetary mass companions.Comment: 12 pages, 2 figures, accepted for publication in ApJ

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