The Moth: An Unusual Circumstellar Structure Associated with HD 61005 | Zendy

Dean C. Hines | Zendy; Glenn Schneider | Zendy; D. J. Hollenbach | Zendy; Eric E. Mamajek | Zendy; Lynne A. Hillenbrand | Zendy; Stanimir Metchev | Zendy; Markus R. Meyer | Zendy; John M. Carpenter | Zendy; Amaya MoroMartín | Zendy; M. D. Silverstone | Zendy; Jinyoung Serena Kim | Zendy; Thomas Henning | Zendy; J. Bouwman | Zendy; S. Wolf | Zendy

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The Moth: An Unusual Circumstellar Structure Associated with HD 61005

Author(s) -

Dean C. Hines,

Glenn Schneider,

D. J. Hollenbach,

Eric E. Mamajek,

Lynne A. Hillenbrand,

Stanimir Metchev,

Markus R. Meyer,

John M. Carpenter,

Amaya MoroMartín,

M. D. Silverstone,

Jinyoung Serena Kim,

Thomas Henning,

J. Bouwman,

S. Wolf

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/525016

Subject(s) - physics , astrophysics , astronomy , circumstellar disk , astrobiology , stars

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.

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