TY - JOUR
T1 - A tale of two Herbig ae stars, mwc 275 and ab aurigae
T2 - Comprehensive models for spectral energy distribution and interferometry
AU - Tannirkulam, A.
AU - Monnier, J. D.
AU - Harries, T. J.
AU - Millan-Gabet, R.
AU - Zhu, Z.
AU - Pedretti, E.
AU - Ireland, M.
AU - Tuthill, P.
AU - Brummelaar, T. Ten
AU - Mcalister, H.
AU - Farrington, C.
AU - Goldfinger, P. J.
AU - Sturmann, J.
AU - Sturmann, L.
AU - Turner, N.
PY - 2008/12/10
Y1 - 2008/12/10
N2 - We present comprehensive models for the Herbig Ae stars MWC 275 and AB Aur that aim to explain their spectral energy distribution (from UV to millimeter) and long-baseline interferometry (from near-infrared to millimeter) simultaneously. Data from the literature, combined with new mid-infrared (MIR) interferometry from the Keck Segment Tilting Experiment, are modeled using an axisymmetric Monte Carlo radiative transfer code. Models in which most of the near-infrared (NIR) emission arises from a dust rim fail to fit the NIR spectral energy distribution (SED) and sub-milliarcsecond NIR CHARA interferometry. Following recent work, we include an additional gas emission component with similar size scale to the dust rim, inside the sublimation radius, to fit the NIR SED and long-baseline NIR interferometry on MWC 275 and AB Aur. In the absence of shielding of starlight by gas, we show that the gas-dust transition region in these YSOs will have to contain highly refractory dust, sublimating at ̃1850 K. Despite having nearly identical structure in the thermal NIR, the outer disks of MWC 275 and AB Aur differ substantially. In contrast to the AB Aur disk, MWC 275 lacks small grains in the disk atmosphere capable of producing significant 10-20μm emission beyond ̃7 AU, forcing the outer regions into the "shadow" of the inner disk.
AB - We present comprehensive models for the Herbig Ae stars MWC 275 and AB Aur that aim to explain their spectral energy distribution (from UV to millimeter) and long-baseline interferometry (from near-infrared to millimeter) simultaneously. Data from the literature, combined with new mid-infrared (MIR) interferometry from the Keck Segment Tilting Experiment, are modeled using an axisymmetric Monte Carlo radiative transfer code. Models in which most of the near-infrared (NIR) emission arises from a dust rim fail to fit the NIR spectral energy distribution (SED) and sub-milliarcsecond NIR CHARA interferometry. Following recent work, we include an additional gas emission component with similar size scale to the dust rim, inside the sublimation radius, to fit the NIR SED and long-baseline NIR interferometry on MWC 275 and AB Aur. In the absence of shielding of starlight by gas, we show that the gas-dust transition region in these YSOs will have to contain highly refractory dust, sublimating at ̃1850 K. Despite having nearly identical structure in the thermal NIR, the outer disks of MWC 275 and AB Aur differ substantially. In contrast to the AB Aur disk, MWC 275 lacks small grains in the disk atmosphere capable of producing significant 10-20μm emission beyond ̃7 AU, forcing the outer regions into the "shadow" of the inner disk.
KW - Circumstellar matter
KW - Planetary systems: protoplanetary disks
KW - Radiative transfer
KW - Stars: pre-main-sequence
KW - Techniques: interferometric
UR - http://www.scopus.com/inward/record.url?scp=58149112852&partnerID=8YFLogxK
U2 - 10.1086/592346
DO - 10.1086/592346
M3 - Article
SN - 0004-637X
VL - 689
SP - 513
EP - 531
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
ER -