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Herschel evidence for disk flattening or gas depletion in transitional disks

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Woitke_2014_TAJ_Herschel.pdf (641.7Kb)
Date
01/06/2014
Author
Keane, J.T.
Pascucci, I.
Espaillat, C.
Woitke, P.
Andrews, S.
Kamp, I.
Thi, W.-F.
Meeus, G.
Dent, W.R.F.
Keywords
Accretion
Accretion disks
Circumstellar matter
Infrared: stars
Protoplanetary disks
Stars: pre-main sequence
QB Astronomy
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Abstract
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. We present new Herschel Space Observatory PACS spectra of [O I] 63.18 μm for 21 transitional disks. Our survey complements the larger Herschel GASPS program ("Gas in Protoplanetary Systems") by quadrupling the number of transitional disks observed with PACS in this wavelength. [O I] 63.18 μm traces material in the outer regions of the disk, beyond the inner cavity of most transitional disks. We find that transitional disks have [O I] 63.18 μm line luminosities ∼2 times fainter than their full disk counterparts. We self-consistently determine various stellar properties (e.g., bolometric luminosity, FUV excess, etc.) and disk properties (e.g., disk dust mass, etc.) that could influence the [O I] 63.18 μm line luminosity, and we find no correlations that can explain the lower [O I] 63.18 μm line luminosities in transitional disks. Using a grid of thermo-chemical protoplanetary disk models, we conclude that either transitional disks are less flared than full disks or they possess lower gas-to-dust ratios due to a depletion of gas mass. This result suggests that transitional disks are more evolved than their full disk counterparts, possibly even at large radii.
Citation
Keane , J T , Pascucci , I , Espaillat , C , Woitke , P , Andrews , S , Kamp , I , Thi , W-F , Meeus , G & Dent , W R F 2014 , ' Herschel evidence for disk flattening or gas depletion in transitional disks ' , Astrophysical Journal , vol. 787 , no. 2 . https://doi.org/10.1088/0004-637X/787/2/153
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.1088/0004-637X/787/2/153
ISSN
0004-637X
Type
Journal article
Rights
© 2014. The American Astronomical Society. All rights reserved.
Description
I.P., J.T.K., C.E., and S.A. acknowledge NASA/JPL for funding support.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5296

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