Hines, Dean C. and Schneider, Glenn and Hollenbach, David and Mamajek, Eric E. and Hillenbrand, Lynne A. and Metchev, Stanimir A. and Meyer, Michael R. and Carpenter, John M. and Moro-Martín, Amaya and Silverstone, Murray D. and Kim, Jinyoung Serena and Henning, Thomas and Bouwman, Jeroen and Wolf, Sebastian (2007) The moth : an unusual circumstellar structure associated with HD 61005. Astrophysical Journal, 671 (2). L165-L168. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:HINapjl08
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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 = L_(IR)/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.
|Additional Information:||© 2007 The American Astronomical Society. Received 2007 June 29; accepted 2007 October 31; published 2007 November 21. We have benefited from discussions with P. Kalas and M. Wyatt. GO 10527 HST observations are supported by NASA through a grant from the Space Telescope Science Institute. FEPS acknowledges support from NASA contracts 1224768 and 1224566 administered through the Jet Propulsion Laboratory.|
|Subject Keywords:||circumstellar matter; infrared: stars; planetary systems: protoplanetary disks; stars: individual (HD 61005)|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||14 Jul 2009 21:06|
|Last Modified:||26 Dec 2012 10:55|
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