TY - JOUR
T1 - The moth
T2 - An unusual circumstellar structure associated with HD 61005
AU - Hines, Dean C.
AU - Schneider, Glenn
AU - Hollenbach, David
AU - Mamajek, Eric E.
AU - Hillenbrand, Lynne A.
AU - Metchev, Stanimir A.
AU - Meyer, Michael R.
AU - Carpenter, John M.
AU - Moro-Martín, Amaya
AU - Silverstone, Murray D.
AU - Jinyoung Serena, K. I.M.
AU - Henning, Thomas
AU - Bouwman, Jeroen
AU - Wolf, Sebastian
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
KW - Circumstellar matter -infrared
KW - Individual (HD 61005)
KW - Protoplanetary disks - Stars
KW - Stars -planetary systems
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U2 - 10.1086/525016
DO - 10.1086/525016
M3 - Article
AN - SCOPUS:42549154849
SN - 0004-637X
VL - 671
SP - L165-L168
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 PART 2
ER -