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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358729.0, MPI für Astronomie / Publikationen_mpia
The moth: an unusual circumstellar structure associated with HD 61005
Authors:Hines, D. C.; Schneider, G.; Hollenbach, D.; Mamajek, E. E.; Hillenbrand, L. A.; Metchev, S. A.; Meyer, M. R.; Carpenter, J. M.; Moro-Martín, A.; Silverstone, M. D.; Kim, J. S.; Henning, T.; Bouwman, J.; Wolf, S.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Start Page:L165
End Page:L168
Audience:Not Specified
Abstract / Description:We present the discovery of an unusual spatially resolved circumstellar structure associated with the ~90 Myr, nearby, G dwarf star HD 61005. Observations from the FEPS Spitzer Legacy Science survey reveal thermal emission in excess of expected stellar photospheric levels. Follow-up 0.1" resolution HST NICMOS coronagraphic images reveal scattered starlight <=7" (~240 AU) from the occulted star (1.1 mum flux density =18+/-3.3 mJy; and 0.77%+/-0.16% of the starlight). The extremely high near-IR scattering fraction and IR excess luminosity f=LIR/L*~2×10-3 suggests scattering particle sizes of order a<~1.1 mum/2pi~0.2 mum, comparable to the blowout size (a~0.3 mum) due to radiation pressure from the star. Dust-scattered starlight is traced inward to an instrumental limit of ~10 AU. The structure exhibits a strong asymmetry about its morphological major axis but is mirror-symmetric about its minor axis.
Free Keywords:Stars: Circumstellar Matter; Infrared: Stars; Stars: Planetary Systems: Protoplanetary Disks; stars: individual (HD 61005)
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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