Zobrazeno 1 - 10
of 2 456
pro vyhledávání: '"circumstellar disks"'
Autor:
Lecavelier des Etangs, Alain
Publikováno v:
Comptes Rendus. Physique, Vol , Iss , Pp 1-11 (2023)
Here we review the last advances in our understanding of exoplanetary upper atmospheres, with a focus on the evaporation of exoplanets orbiting close to their stars. The atmospheric escape takes a significant part on the phenomena that sculpt the pop
Externí odkaz:
https://doaj.org/article/38a6ad74b8f74445b04100ee838f98ba
Publikováno v:
The Astrophysical Journal Letters, Vol 977, Iss 1, p L28 (2024)
We present spectroscopic and photometric observations of Bernhard-2, which was previously identified as a candidate system that hosts a misaligned circumbinary disk. Our spectroscopic measurements confirm that Bernhard-2 indeed contains an eccentric
Externí odkaz:
https://doaj.org/article/a0b4af5934284fb5a74d415187e303ef
Autor:
Elias R. Most, Hai-Yang Wang
Publikováno v:
The Astrophysical Journal Letters, Vol 973, Iss 1, p L19 (2024)
Binary systems with comparable masses and a surrounding accretion disk can accrete gas through spiral accretion streams penetrating the central cavity formed by tidal interactions. Using three-dimensional Newtonian magnetohydrodynamics simulations, w
Externí odkaz:
https://doaj.org/article/0887896e29a64a74baa8973a1ce01b51
Autor:
Hsi-Wei Yen, Yueh-Ning Lee
Publikováno v:
The Astrophysical Journal Letters, Vol 972, Iss 2, p L27 (2024)
Protostellar disks around young protostars exhibit diverse properties, with their radii ranging from less than ten to several hundred astronomical units. To investigate the mechanisms shaping this disk radius distribution, we compiled a sample of 27
Externí odkaz:
https://doaj.org/article/645632accbdc40b1bc59c625cf3a64c1
Publikováno v:
The Astrophysical Journal Letters, Vol 969, Iss 1, p L21 (2024)
The gas and solid-state C/O ratios provide context to potentially link the atmospheric composition of planets to that of the natal disk. We provide a synthesis of extant estimates of the gaseous C/O and C/H ratios in planet-forming disks obtained pri
Externí odkaz:
https://doaj.org/article/3e8e0f42d6624e18aa3a97f90ccf397a
Autor:
Boccaletti, Anthony
Publikováno v:
Comptes Rendus. Physique, Vol , Iss , Pp 1-19 (2023)
The technological developments initiated in the early 21$^{\rm st}$ century have led to the implementation of “planet finders” instruments on 8-m class telescopes which are in operation since 2014-2015. Such facilities are at the inception of sig
Externí odkaz:
https://doaj.org/article/463f08a669d3401891f2149a45bb0889
Autor:
Kate Y. L. Su, András Gáspár, George H. Rieke, Renu Malhotra, Luca Matrá, Schuyler Grace Wolff, Jarron M. Leisenring, Charles Beichman, Marie Ygouf
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 2, p 277 (2024)
We present images of the Vega planetary debris disk obtained at 15.5, 23, and 25.5 μ m with the Mid-Infrared Instrument on JWST. The debris system is remarkably symmetric, smooth, and centered accurately on the star. There is a broad Kuiper-belt-ana
Externí odkaz:
https://doaj.org/article/cf41cc86a0634b1b8218b97e71a08015
Autor:
Yiwei Chai, Christine H. Chen, Kadin Worthen, Alexis Li, Antranik A. Sefilian, William Balmer, Dean C. Hines, David R. Law, B. A. Sargent, Mark Wyatt, Cicero X. Lu, Marshall D. Perrin, Isabel Rebollido, Emily Rickman, G. C. Sloan
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 2, p 167 (2024)
We report JWST Mid-Infrared Instrument (MIRI) Medium Resolution Spectrograph (MRS) observations of the β Pic moving-group member, η Tel A, along with its brown dwarf binary companion, η Tel B. Following point-spread-function subtraction, we recove
Externí odkaz:
https://doaj.org/article/d3184a07c983455d9f17236a757ba473
Autor:
K. L. Luhman, C. Alves de Oliveira, I. Baraffe, G. Chabrier, E. Manjavacas, R. J. Parker, P. Tremblin
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 162 (2024)
We have used the multiobject mode of the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST) to obtain low-resolution 1–5 μ m spectra of 22 brown dwarf candidates in the Orion Nebula Cluster, which were selected wit
Externí odkaz:
https://doaj.org/article/19c7c1e5fffd42d090fa5eedd9bbc94e
Autor:
Melvyn Wright, Brett A. McGuire, Adam Ginsburg, Tomoya Hirota, John Bally, Ryan Hwangbo, T. Dex Bhadra, Chris John, Rishabh Dave
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 150 (2024)
We present Atacama Large Millimeter/submillimeter Array observations of SiO, SiS, H _2 O, NaCl, and SO line emission at ∼30–50 mas resolution. These images map the molecular outflow and disk of Orion Source I (SrcI) on ∼12–20 au scales. Our o
Externí odkaz:
https://doaj.org/article/1605d975d9e64319bc0713eecc0568f6