Zobrazeno 1 - 10
of 155
pro vyhledávání: '"Ilsedore Cleeves"'
Autor:
Kenji Furuya, Takashi Tsukagoshi, Chunhua Qi, Hideko Nomura, L. Ilsedore Cleeves, Seokho Lee, Tomohiro C. Yoshida
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 1, p 73 (2024)
Externí odkaz:
https://doaj.org/article/b08de6e035de4b259f66fb9901429f6d
Autor:
Deryl E. Long, L. Ilsedore Cleeves, Fred C. Adams, Sean Andrews, Edwin A. Bergin, Viviana V. Guzmán, Jane Huang, A. Meredith Hughes, Chunhua Qi, Kamber Schwarz, Jacob B. Simon, David Wilner
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 88 (2024)
Ionization drives important chemical and dynamical processes within protoplanetary disks, including the formation of organics and water in the cold midplane and the transportation of material via accretion and magnetohydrodynamic flows. Understanding
Externí odkaz:
https://doaj.org/article/4c56317f7df5440e857b987d12f0241b
Autor:
Javiera K. Díaz-Berríos, Viviana V. Guzmán, Catherine Walsh, Karin I. Öberg, L. Ilsedore Cleeves, Elizabeth Artur de la Villarmois, John Carpenter
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 2, p 165 (2024)
Most stars are born in stellar clusters, and their protoplanetary disks, which are the birthplaces of planets, can, therefore, be affected by the radiation of nearby massive stars. However, little is known about the chemistry of externally irradiated
Externí odkaz:
https://doaj.org/article/d6137d2215f849568eff9bdc76b1d648
Autor:
Claudio Hernández-Vera, Viviana V. Guzmán, Elizabeth Artur de la Villarmois, Karin I. Öberg, L. Ilsedore Cleeves, Michiel R. Hogerheijde, Chunhua Qi, John Carpenter, Edith C. Fayolle
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 1, p 68 (2024)
H _2 CO is a small organic molecule widely detected in protoplanetary disks. As a precursor to grain-surface formation of CH _3 OH, H _2 CO is considered an important precursor of O-bearing organic molecules that are locked in ices. Still, since gas-
Externí odkaz:
https://doaj.org/article/976525fdf45a487daf47f915d84ba4c1
Autor:
Dana E. Anderson, L. Ilsedore Cleeves, Geoffrey A. Blake, Chunhua Qi, Edwin A. Bergin, John M. Carpenter, Kamber R. Schwarz, Claire Thilenius, Ke Zhang
Publikováno v:
The Astrophysical Journal, Vol 966, Iss 1, p 84 (2024)
Molecular emission is used to investigate both the physical and chemical properties of protoplanetary disks. Therefore, to derive disk properties accurately, we need a thorough understanding of the behavior of the molecular probes upon which we rely.
Externí odkaz:
https://doaj.org/article/8a4a54bf8ec54d7280bdb476ea09eb80
Autor:
Edwin A. Bergin, Arthur Bosman, Richard Teague, Jenny Calahan, Karen Willacy, L. Ilsedore Cleeves, Kamber Schwarz, Ke Zhang, Simon Bruderer
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 2, p 147 (2024)
We present the first detection of ^13 CCH in a protoplanetary disk (TW Hya). Using observations of C _2 H, we measure CCH/ ^13 CCH = 65 ± 20 gas with a CO isotopic ratio of ^12 CO/ ^13 CO = 21 ± 5. The TW Hya disk exhibits a gas phase C/O that exce
Externí odkaz:
https://doaj.org/article/b81406ef94bb4d5a878bc44e95bbd8c9
Autor:
Carlos E. Romero-Mirza, Karin I. Öberg, Andrea Banzatti, Klaus M. Pontoppidan, Sean M. Andrews, David J. Wilner, Edwin A. Bergin, Ian Czekala, Charles J. Law, Colette Salyk, Richard Teague, Chunhua Qi, Jennifer B. Bergner, Jane Huang, Catherine Walsh, Viviana V. Guzmán, L. Ilsedore Cleeves, Yuri Aikawa, Jaehan Bae, Alice S. Booth, Gianni Cataldi, John D. Ilee, Romane Le Gal, Feng Long, Ryan A. Loomis, François Menard, Yao Liu
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 1, p 36 (2024)
We present MIRI Medium-resolution Spectrograph observations of the large, multi-gapped protoplanetary disk around the T Tauri star AS 209. The observations reveal hundreds of water vapor lines from 4.9–25.5 μ m toward the inner ∼1 au in the disk
Externí odkaz:
https://doaj.org/article/9220f739430b4e5eb0ee6051337d1018
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 1, p 90 (2024)
Molecular abundances in protoplanetary disks are highly sensitive to the local physical conditions, including gas temperature, gas density, radiation field, and dust properties. Often multiple factors are intertwined, impacting the abundances of both
Externí odkaz:
https://doaj.org/article/0bec58d16daa4906bfbd307c9cdb660e
Publikováno v:
The Astrophysical Journal Letters, Vol 959, Iss 2, p L27 (2023)
The central star and its energetic radiation fields play a vital role in setting the vertical and radial chemical structure of planet-forming disks. We present observations that, for the first time, clearly reveal the UV-irradiated surface of a proto
Externí odkaz:
https://doaj.org/article/ae4bfa1c28d8463fa704881455d842ca
Publikováno v:
The Astrophysical Journal, Vol 956, Iss 2, p 135 (2023)
The dominant form of oxygen in cold molecular clouds is gas-phase carbon monoxide (CO) and ice-phase water (H _2 O). Yet, in planet-forming disks around young stars, gas-phase CO and H _2 O are less abundant relative to their interstellar medium valu
Externí odkaz:
https://doaj.org/article/a7413ac2b270429a9bacade610480ecf