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Title: C/O and snowline locations in protoplanetary disks: the effect of radial drift and viscous gas accretion

Abstract

The C/O ratio is a defining feature of both gas giant atmospheric and protoplanetary disk chemistry. In disks, the C/O ratio is regulated by the presence of snowlines of major volatiles at different distances from the central star. We explore the effect of the radial drift of solids and viscous gas accretion onto the central star on the snowline locations of the main C and O carriers in a protoplanetary disk, H{sub 2}O, CO{sub 2}, and CO, and their consequences for the C/O ratio in gas and dust throughout the disk. We determine the snowline locations for a range of fixed initial particle sizes and disk types. For our fiducial disk model, we find that grains with sizes ∼0.5 cm ≲ s ≲ 7 m for an irradiated disk and ∼0.001 cm ≲ s ≲ 7 m for an evolving and viscous disk desorb at a size-dependent location in the disk, which is independent of the particle's initial position. The snowline radius decreases for larger particles, up to sizes of ∼7 m. Compared to a static disk, we find that radial drift and gas accretion in a viscous disk move the H{sub 2}O snowline inwards by up to 40%, the CO{submore » 2} snowline by up to 60%, and the CO snowline by up to 50%. We thus determine an inner limit on the snowline locations when radial drift and gas accretion are accounted for.« less

Authors:
; ;  [1];  [2]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  2. Department of Physics, University of California, Santa Barbara, CA 93106 (United States)
Publication Date:
OSTI Identifier:
22882345
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 815; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; Journal ID: ISSN 0004-637X
Country of Publication:
United Kingdom
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON DIOXIDE; CARBON MONOXIDE; COMPARATIVE EVALUATIONS; COSMIC DUST; DISTANCE; IRRADIATION; PROTOPLANETS; SOLIDS; STARS

Citation Formats

Piso, Ana-Maria A., Öberg, Karin I., Birnstiel, Tilman, and Murray-Clay, Ruth A. C/O and snowline locations in protoplanetary disks: the effect of radial drift and viscous gas accretion. United Kingdom: N. p., 2015. Web. doi:10.1088/0004-637X/815/2/109.
Piso, Ana-Maria A., Öberg, Karin I., Birnstiel, Tilman, & Murray-Clay, Ruth A. C/O and snowline locations in protoplanetary disks: the effect of radial drift and viscous gas accretion. United Kingdom. https://doi.org/10.1088/0004-637X/815/2/109
Piso, Ana-Maria A., Öberg, Karin I., Birnstiel, Tilman, and Murray-Clay, Ruth A. Sun . "C/O and snowline locations in protoplanetary disks: the effect of radial drift and viscous gas accretion". United Kingdom. https://doi.org/10.1088/0004-637X/815/2/109.
@article{osti_22882345,
title = {C/O and snowline locations in protoplanetary disks: the effect of radial drift and viscous gas accretion},
author = {Piso, Ana-Maria A. and Öberg, Karin I. and Birnstiel, Tilman and Murray-Clay, Ruth A.},
abstractNote = {The C/O ratio is a defining feature of both gas giant atmospheric and protoplanetary disk chemistry. In disks, the C/O ratio is regulated by the presence of snowlines of major volatiles at different distances from the central star. We explore the effect of the radial drift of solids and viscous gas accretion onto the central star on the snowline locations of the main C and O carriers in a protoplanetary disk, H{sub 2}O, CO{sub 2}, and CO, and their consequences for the C/O ratio in gas and dust throughout the disk. We determine the snowline locations for a range of fixed initial particle sizes and disk types. For our fiducial disk model, we find that grains with sizes ∼0.5 cm ≲ s ≲ 7 m for an irradiated disk and ∼0.001 cm ≲ s ≲ 7 m for an evolving and viscous disk desorb at a size-dependent location in the disk, which is independent of the particle's initial position. The snowline radius decreases for larger particles, up to sizes of ∼7 m. Compared to a static disk, we find that radial drift and gas accretion in a viscous disk move the H{sub 2}O snowline inwards by up to 40%, the CO{sub 2} snowline by up to 60%, and the CO snowline by up to 50%. We thus determine an inner limit on the snowline locations when radial drift and gas accretion are accounted for.},
doi = {10.1088/0004-637X/815/2/109},
url = {https://www.osti.gov/biblio/22882345}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 815,
place = {United Kingdom},
year = {2015},
month = {12}
}