Results 21 to 30 of about 3,157,542 (333)

Dense gas in a giant molecular filament [PDF]

Astronomy & Astrophysics, 2020
Context. Recent surveys of the Galactic plane in the dust continuum and CO emission lines reveal that large (≳50 pc) and massive (≳105 M⊙) filaments, know as giant molecular filaments (GMFs), may be linked to Galactic dynamics and trace the mid-plane of the gravitational potential in the Milky Way.
Y. Wang, H. Beuther, N. Schneider, S. E. Meidt, H. Linz, S. Ragan, C. Zucker, C. Battersby, J. D. Soler, E. Schinnerer, F. Bigiel, D. Colombo, Th. Henning   +12 more
openaire   +5 more sources

Retention of Long-period Gas Giant Planets: Type II Migration Revisited [PDF]

, 2020
During their formation, emerging protoplanets tidally interact with their natal disks. Proto-gas-giant planets, with Hills radius larger than the disk thickness, open gaps and quench gas flow in the vicinity of their orbits.
Yi-Xian Chen, Xiao‐jia Zhang, Ya-Ping Li, Hui Li, D. Lin   +4 more
semanticscholar   +1 more source

Forming Gas Giants around a Range of Protostellar M-dwarfs by Gas Disk Gravitational Instability

The Astrophysical Journal, 2023
Recent discoveries of gas giant exoplanets around M-dwarfs from transiting and radial velocity surveys are difficult to explain with core-accretion models. We present here a homogeneous suite of 162 models of gravitationally unstable gaseous disks. These
Alan P. Boss, Shubham Kanodia
doaj   +1 more source

Breaking Degeneracies in Formation Histories by Measuring Refractory Content in Gas Giants

The Astrophysical Journal, 2023
Relating planet formation to atmospheric composition has been a long-standing goal of the planetary science community. So far, most modeling studies have focused on predicting the enrichment of heavy elements and the C/O ratio in giant planet atmospheres.
Yayaati Chachan, Heather A. Knutson, Joshua Lothringer, Geoffrey A. Blake   +3 more
doaj   +1 more source

Investigating Trends in Atmospheric Compositions of Cool Gas Giant Planets Using Spitzer Secondary Eclipses [PDF]

Astronomical Journal, 2019
We present new 3.6 and 4.5 μm secondary eclipse measurements for five cool (T ≲ 1000 K) transiting gas giant planets: HAT-P-15b, HAT-P-17b, HAT-P-18b, HAT-P-26b, and WASP-69b.
N. Wallack, H. Knutson, C. Morley, J. Moses, N. H. Thomas, D. Thorngren, D. Deming, J. D'esert, J. Fortney, J. Kammer   +9 more
semanticscholar   +1 more source

Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810 [PDF]

Astronomical Journal, 2018
The N2K planet search program was designed to exploit the planet-metallicity correlation by searching for gas giant planets orbiting metal-rich stars. Here, we present the radial velocity measurements for 378 N2K target stars that were observed with the ...
K. Ment, D. Fischer, G. Bakos, A. Howard, H. Isaacson   +4 more
semanticscholar   +1 more source

MOA-bin-29b: A Microlensing Gas-giant Planet Orbiting a Low-mass Host Star [PDF]

Astronomical Journal, 2019
We report the discovery of a gas-giant planet orbiting a low-mass host star in the microlensing event MOA-bin-29 that occurred in 2006. We find five degenerate solutions with the planet/host-star mass ratio of q ∼ 10−2.
I. Kondo, T. Sumi, D. Bennett, A. Udalski, I. Bond, N. Rattenbury, V. Bozza, Y. Hirao, D. Suzuki, N. Koshimoto, M. Nagakane, S. Miyazaki, F. Abe, R. Barry, A. Bhattacharya, M. Donachie, A. Fukui, H. Fujii, Y. Itow, Y. Kamei, M. Li, Y. Matsubara, T. Matsuo, Y. Muraki, C. Ranc, H. Shibai, H. Suematsu, D. Sullivan, P. Tristram, T. Yamakawa, A. Yonehara, P. Mróz, M. Szymański, I. Soszyński, K. Ulaczyk   +34 more
semanticscholar   +1 more source

Long-term Stability of Planetary Systems Formed from a Transitional Disk

The Astrophysical Journal, 2023
Transitional disks are protoplanetary disks with large and deep central holes in the gas, possibly carved by young planets. Dong & Dawson simulated systems with multiple giant planets that were capable of carving and maintaining such gaps during the disk
Rory Bowens, Andrew Shannon, Rebekah Dawson, Jiayin Dong   +3 more
doaj   +1 more source

Tidally Heated Exomoons around Gas Giants [PDF]

The Planetary Science Journal, 2021
Abstract Thousands of exoplanets have been discovered; however, the detection of exomoons remains elusive. Tidally heated exomoons have been proposed as candidate targets for observation; vigorous tidal dissipation can raise the moon’s surface temperature, making direct imaging possible, and cause widespread volcanism that can have a ...
Marc Rovira-Navarro, Wouter van der Wal, Teresa Steinke, Dominic Dirkx   +3 more
openaire   +4 more sources

H− Opacity and Water Dissociation in the Dayside Atmosphere of the Very Hot Gas Giant WASP-18b [PDF]

, 2018
We present one of the most precise emission spectra of an exoplanet observed so far. We combine five secondary eclipses of the hot Jupiter WASP-18b (Tday ∼ 2900 K) that we secured between 1.1 and 1.7 μm with the Wide Field Camera 3 instrument on board ...
J. Arcangeli, J. Désert, M. Line, J. Bean, V. Parmentier, K. Stevenson, L. Kreidberg, J. Fortney, M. Mansfield, A. Showman   +9 more
semanticscholar   +1 more source