2016A&A...592A..83K


Query : 2016A&A...592A..83K

2016A&A...592A..83K - Astronomy and Astrophysics, volume 592A, 83-83 (2016/8-1)

Volatile-carbon locking and release in protoplanetary disks. A study of TW Hya and HD 100546.

KAMA M., BRUDERER S., VAN DISHOECK E.F., HOGERHEIJDE M., FOLSOM C.P., MIOTELLO A., FEDELE D., BELLOCHE A., GUSTEN R. and WYROWSKI F.

Abstract (from CDS):

Aims. The composition of planetary solids and gases is largely rooted in the processing of volatile elements in protoplanetary disks. To shed light on the key processes, we carry out a comparative analysis of the gas-phase carbon abundance in two systems with a similar age and disk mass, but different central stars: HD 100546 and TW Hya.
Methods. We combine our recent detections of C0 in these disks with observations of other carbon reservoirs (CO, C+, C2H) and gas-mass and warm-gas tracers (HD, O0), as well as spatially resolved ALMA observations and the spectral energy distribution. The disks are modelled with the DALI 2D physical-chemical code. Stellar abundances for HD 100546 are derived from archival spectra.
Results. Upper limits on HD emission from HD 100546 place an upper limit on the total disk mass of ≤0.1M. The gas-phase carbon abundance in the atmosphere of this warm Herbig disk is, at most, moderately depleted compared to the interstellar medium, with [C]/[H]gas=(0.1-1.5)x10–4. HD 100546 itself is a λBootis star, with solar abundances of C and O but a strong depletion of rock-forming elements. In the gas of the T Tauri disk TW Hya, both C and O are strongly underabundant, with [C]/[H]gas=(0.2-5.0)x10–6 and C/O>1. We discuss evidence that the gas-phase C and O abundances are high in the warm inner regions of both disks. Our analytical model, including vertical mixing and a grain size distribution, reproduces the observed [C]/[H]gas in the outer disk of TW Hya and allows to make predictions for other systems.

Abstract Copyright: © ESO, 2016

Journal keyword(s): astrochemistry - protoplanetary disks

VizieR on-line data: <Available at CDS (J/A+A/592/A83): hd_gd10.dat hd_gd100.dat twco15.dat>

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* DM Tau Or* 04 33 48.7336763736 +18 10 09.973460280 14.30 14.82 14.00     M2Ve 579 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2153 1
3 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1736 1
4 HD 100546 Be* 11 33 25.4408872296 -70 11 41.241297948   6.71 6.30   6.64 A0VaekB8_lB 717 1

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2022.05.28-09:53:49

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