The Moth: An Unusual Circumstellar Structure Associated with HD 61005

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dc.contributor.author Silverstone, Murray
dc.date.accessioned 2019-06-13T18:55:31Z
dc.date.available 2019-06-13T18:55:31Z
dc.date.issued 2007-11-21
dc.identifier.citation Hines, D., et al. (2007): The Moth: An Unusual Circumstellar Structure Associated with HD 61005. The Astronomical Journal, 671(2). DOI: https://doi.org/10.1086/525016 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5746
dc.description.abstract 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 alesssim 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. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject circumstellar matter en_US
dc.subject infrared: stars en_US
dc.subject planetary systems: protoplanetary disks en_US
dc.subject stars: individual (HD 61005) en_US
dc.title The Moth: An Unusual Circumstellar Structure Associated with HD 61005 en_US
dc.type text en_US


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