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The moth : an unusual circumstellar structure associated with HD 61005

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. doi:10.1086/525016.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Hines, Dean C.0000-0003-4653-6161
Schneider, Glenn0000-0002-4511-5966
Mamajek, Eric E.0000-0003-2008-1488
Metchev, Stanimir A.0000-0003-3050-8203
Meyer, Michael R.0000-0003-1227-3084
Carpenter, John M.0000-0003-2251-0602
Moro-Martín, Amaya0000-0001-9504-8426
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.
Funding AgencyGrant Number
Space Telescope Science InstituteUNSPECIFIED
Subject Keywords:circumstellar matter; infrared: stars; planetary systems: protoplanetary disks; stars: individual (HD 61005)
Issue or Number:2
Record Number:CaltechAUTHORS:HINapjl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13848
Deposited By: Tony Diaz
Deposited On:14 Jul 2009 21:06
Last Modified:08 Nov 2021 22:41

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