Zobrazeno 1 - 10
of 316
pro vyhledávání: '"Sean M. Andrews"'
Publikováno v:
The Astrophysical Journal Letters, Vol 972, Iss 1, p L9 (2024)
Planet formation occurs over a few Myr within protoplanetary disks of dust and gas, which are often assumed to evolve in isolation. However, extended gaseous structures have been uncovered around many protoplanetary disks, suggestive of late-stage in
Externí odkaz:
https://doaj.org/article/5399e511a361421990271bd566ad994c
Autor:
Kristina Monsch, Joshua Bennett Lovell, Ciprian T. Berghea, Gordian Edenhofer, Garrett K. Keating, Sean M. Andrews, Ammar Bayyari, Jeremy J. Drake, David J. Wilner
Publikováno v:
The Astrophysical Journal Letters, Vol 967, Iss 1, p L2 (2024)
We present resolved images of IRAS 23077+6707 (“Dracula’s Chivito”) in 1.3 mm/225 GHz thermal dust and CO gas emission with the Submillimeter Array (SMA) and optical (0.5–0.8 μ m) scattered light with the Panoramic Survey Telescope and Rapid
Externí odkaz:
https://doaj.org/article/e0db5de669374ec19daba69974aee62f
Autor:
Joshua Bennett Lovell, Garrett K. Keating, David J. Wilner, Sean M. Andrews, Meredith MacGregor, Ramisa Akther Rahman, Ramprasad Rao, Jonathan P. Williams
Publikováno v:
The Astrophysical Journal Letters, Vol 962, Iss 1, p L12 (2024)
We present evidence of variable 1.3 mm emission from the 1 to 3 Myr, spectral-type G2–G5 class III young stellar object (YSO), HD 283572. HD 283572 was observed on eight dates with the Submillimeter Array between 2021 December and 2023 May, with a
Externí odkaz:
https://doaj.org/article/6ee75a981d9f4f048f50e2768229df96
Autor:
Jane Huang, Edwin A. Bergin, Romane Le Gal, Sean M. Andrews, Jaehan Bae, Luke Keyte, J. A. Sturm
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 2, p 135 (2024)
Millimeter wavelength observations of Class II protoplanetary disks often display strong emission from hydrocarbons and high CS/SO values, providing evidence that the gas-phase C/O ratio commonly exceeds 1 in their outer regions. We present new NOEMA
Externí odkaz:
https://doaj.org/article/c8fe3421ed294665adee5506d3a60491
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 2, p 153 (2024)
Using controlled injection and recovery experiments, we devised an analysis prescription to assess the quality of dynamical measurements of protoplanetary disk gas masses based on resolved (CO) spectral line data, given observational limitations (res
Externí odkaz:
https://doaj.org/article/efbb32aa54f8453d83036327e927f166
Autor:
Chia-Ying Chung, Sean M. Andrews, Mark A. Gurwell, Melvyn Wright, Feng Long, Wenrui Xu, Hauyu Baobab Liu
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 273, Iss 2, p 29 (2024)
We present a new Submillimeter Array survey of 47 Class II sources in the Taurus–Auriga region. Our observations made 12 independent samples of flux densities over the 200–400 GHz frequency range. We tightly constrained the spectral indices of mo
Externí odkaz:
https://doaj.org/article/b4aee78c57db4a868a1e6208d61f9eac
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
Autor:
Maria Galloway-Sprietsma, Jaehan Bae, Richard Teague, Myriam Benisty, Stefano Facchini, Yuri Aikawa, Felipe Alarcón, Sean M. Andrews, Edwin Bergin, Gianni Cataldi, L. Ilsedore Cleeves, Ian Czekala, Viviana V. Guzmán, Jane Huang, Charles J. Law, Romane Le Gal, Yao Liu, Feng Long, François Ménard, Karin I. Öberg, Catherine Walsh, David J. Wilner
Publikováno v:
The Astrophysical Journal, Vol 950, Iss 2, p 147 (2023)
We study the kinematics of the AS 209 disk using the J = 2–1 transitions of ^12 CO, ^13 CO, and C ^18 O. We derive the radial, azimuthal, and vertical velocity of the gas, taking into account the lowered emission surface near the annular gap at ≃
Externí odkaz:
https://doaj.org/article/429052631901415d95cba5db610e05dc
Autor:
Feng Long, Bin B. Ren, Nicole L. Wallack, Daniel Harsono, Gregory J. Herczeg, Paola Pinilla, Dimitri Mawet, Michael C. Liu, Sean M. Andrews, Xue-Ning Bai, Sylvie Cabrit, Lucas A. Cieza, Doug Johnstone, Jarron M. Leisenring, Giuseppe Lodato, Yao Liu, Carlo F. Manara, Gijs D. Mulders, Enrico Ragusa, Steph Sallum, Yangfan Shi, Marco Tazzari, Taichi Uyama, Kevin Wagner, David J. Wilner, Jerry W. Xuan
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 1, p 27 (2023)
Planet formation imprints signatures on the physical structures of disks. In this paper, we present high-resolution (∼50 mas, 8 au) Atacama Large Millimeter/submillimeter Array observations of 1.3 mm dust continuum and CO line emission toward the d
Externí odkaz:
https://doaj.org/article/884a898a5cb34867ba6028f8bcd6a59a
Autor:
Charles J. Law, Richard Teague, Karin I. Öberg, Evan A. Rich, Sean M. Andrews, Jaehan Bae, Myriam Benisty, Stefano Facchini, Kevin Flaherty, Andrea Isella, Sheng Jin, Jun Hashimoto, Jane Huang, Ryan A. Loomis, Feng Long, Carlos E. Romero-Mirza, Teresa Paneque-Carreño, Laura M. Pérez, Chunhua Qi, Kamber R. Schwarz, Jochen Stadler, Takashi Tsukagoshi, David J. Wilner, Gerrit van der Plas
Publikováno v:
The Astrophysical Journal, Vol 948, Iss 1, p 60 (2023)
High-spatial-resolution observations of CO isotopologue line emission in protoplanetary disks at mid-inclinations (≈30°–75°) allow us to characterize the gas structure in detail, including radial and vertical substructures, emission surface hei
Externí odkaz:
https://doaj.org/article/3ac66baf4a0e44ba8795e9b566d10dfd