Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...671l.165h&link_type=abstract
The Astrophysical Journal, Volume 671, Issue 2, pp. L165-L168.
Astronomy and Astrophysics
Astronomy
20
Stars: Circumstellar Matter, Infrared: Stars, Stars: Planetary Systems: Protoplanetary Disks, Stars: Individual (Hd 61005)
Scientific paper
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 μm 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 μm/2π~0.2 μm, comparable to the blowout size (a~0.3 μm) 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.
Bouwman Jeroen
Carpenter John Michael
Henning Thomas
Hillenbrand Lynne A.
Hines Dean Carter
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