Results 1 to 10 of about 205,935 (75)
Measuring the Dust Masses of Protoplanetary Disks in Lupus with ALMA: Evidence that Disks can be Optically Thick at 3 mm [PDF]
, 2022 Accurate disk mass measurements are necessary to constrain disk evolution and the timescale of planet formation, but such measurements are difficult to make and are very dependent on assumptions. Here we look at the assumption that the disk is optically thin at radio wavelengths and the effect of this assumption on measurements of disk dust mass.
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Determining Dust Properties in Protoplanetary Disks: SED-derived Masses and Settling With ALMA [PDF]
, 2022 We present spectral energy distribution (SED) modeling of 338 disks around T Tauri stars from eleven star-forming regions, ranging from $\sim$0.5 to 10 Myr old. The disk masses we infer from our SED models are typically greater than those reported from (sub)mm surveys by a factor of 1.5-5, with the discrepancy being generally higher for the more ...
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Dust Growth and Settling in Protoplanetary Disks and Disk Spectral Energy Distributions. I. Laminar Disks [PDF]
Astrophys.J. 625 (2005) 414-426, 2005 Dust growth and settling considerably affect the spectral energy distributions (SEDs) of protoplanetary disks. We investigated dust growth and settling in protoplanetary disks through numerical simulations to examine time-evolution of the disk optical thickness and SEDs.
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Diffusive low optical depth particle disks truncated by planets [PDF]
Mon.Not.Roy.Astron.Soc.377:1287-1294,2007, 2007 Two dimensional particle disks in proximity to a planet are numerically integrated to determine when a planet in a circular orbit can truncate a particle disk. Collisions are treated by giving each particle a series of velocity perturbations during the integration.
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Near-ultraviolet and optical effects of Debris Disks around White Dwarfs [PDF]
Astrophys.J.704:L93-L97,2009, 2009 Studies of debris disks around white dwarfs (WDs) have focused on infrared wavelengths because debris disks are much colder than the star and are believed to contribute to the spectrum only at longer wavelengths. Nevertheless, these disks are made of dust grains which absorb and scatter near-UV and optical photons from the WD, leaving a fingerprint ...
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Confirmation of a gapped primordial disk around LkCa 15 [PDF]
Astrophys.J.682:L125-L128,2008, 2008 Recently, analysis of near-infrared broad-band photometry and Spitzer IRS spectra has led to the identification of a new "pre-transitional disk" class whose members have an inner optically thick disk separated from an outer optically thick disk by an optically thin gap.
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Unveiling the Structure of Pre-Transitional Disks [PDF]
, 2010 In the past few years, several disks with inner holes that are empty of small dust grains have been detected and are known as transitional disks. Recently, Spitzer has identified a new class of "pre-transitional disks" with gaps; these objects have an optically thick inner disk separated from an optically thick outer disk by an optically thin disk gap.
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The 2-D structure of dusty disks around Herbig Ae/Be stars, I. Models with grey opacities [PDF]
Astron.Astrophys. 395 (2002) 853-862, 2002 In this paper the two-dimensional structure of protoplanetary disks around Herbig Ae/Be stars is studied. This is done by constructing a self-consistent model based on 2-D radiative transfer coupled to the equation of vertical hydrostatics. As a simplifying assumption a grey opacity is used. It is found that the disk can adopt four different structures,
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Herschel evidence for disk flattening or gas depletion in transitional disks [PDF]
, 2014 Transitional disks are protoplanetary disks characterized by reduced near- and mid-infrared emission with respect to full disks. This characteristic spectral energy distribution indicates the presence of an optically thin inner cavity within the dust disk believed to mark the disappearance of the primordial massive disk.
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On the Diversity of the Taurus Transitional Disks: UX Tau A & Lk Ca 15 [PDF]
, 2007 The recently recognized class of "transitional disk" systems consists of young starswith optically-thick outer disks but inner disks which are mostly devoid of small dust. Here we introduce a further class of "pre-transitional disks" with significant near-infrared excesses which indicate the presence of an optically thick inner disk separated from an ...
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