Zobrazeno 1 - 10
of 192
pro vyhledávání: '"Exoplanet formation"'
Autor:
Thomas G. Beatty, Luis Welbanks, Everett Schlawin, Taylor J. Bell, Michael R. Line, Matthew Murphy, Isaac Edelman, Thomas P. Greene, Jonathan J. Fortney, Gregory W. Henry, Sagnick Mukherjee, Kazumasa Ohno, Vivien Parmentier, Emily Rauscher, Lindsey S. Wiser, Kenneth E. Arnold
Publikováno v:
The Astrophysical Journal Letters, Vol 970, Iss 1, p L10 (2024)
We report observations of the atmospheric transmission spectrum of the sub-Neptune exoplanet GJ 3470 b taken using the Near-Infrared Camera on JWST. Combined with two archival Hubble Space Telescope/Wide-Field Camera 3 transit observations and 15 arc
Externí odkaz:
https://doaj.org/article/bb3f143b658a4d25b78e282d88b017e2
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:
Marta L. Bryan, Eve J. Lee
Publikováno v:
The Astrophysical Journal Letters, Vol 968, Iss 2, p L25 (2024)
The connection between outer gas giants and inner super-Earths reflects their formation and evolutionary histories. Past work exploring this link has suggested a tentative positive correlation between these two populations, but these studies have bee
Externí odkaz:
https://doaj.org/article/3e9328472af848b3af719d452bc402da
Autor:
Armaan V. Goyal, Songhu Wang
Publikováno v:
The Astrophysical Journal Letters, Vol 968, Iss 1, p L4 (2024)
The ubiquity of “peas-in-a-pod” architectural patterns and the existence of the radius valley each presents a striking population-level trend for planets with R _p ≤ 4 R _⊕ that serves to place powerful constraints on the formation and evolut
Externí odkaz:
https://doaj.org/article/fc51f6060fc644348440197e72ded00a
Autor:
Billy Edwards, Quentin Changeat
Publikováno v:
The Astrophysical Journal Letters, Vol 962, Iss 2, p L30 (2024)
We present a comprehensive atmospheric retrieval study of the hot Jupiter WASP-77A b using eclipse observations from the Hubble Space Telescope (HST) and JWST. Using atmospheric retrievals, the spectral features of H _2 O, CO, and TiO are identified,
Externí odkaz:
https://doaj.org/article/729a0625132948499fc861c676b7016e
Autor:
Megan Delamer, Shubham Kanodia, Caleb I. Cañas, Simon Müller, Ravit Helled, Andrea S. J. Lin, Jessica E. Libby-Roberts, Arvind F. Gupta, Suvrath Mahadevan, Johanna Teske, R. Paul Butler, Samuel W. Yee, Jeffrey D. Crane, Stephen Shectman, David Osip, Yuri Beletsky, Andrew Monson, Leslie Hebb, Luke C. Powers, John P. Wisniewski, Jaime A. Alvarado-Montes, Chad F. Bender, Jiayin Dong, Te Han, Joe P. Ninan, Paul Robertson, Arpita Roy, Christian Schwab, Guđmundur Stefánsson, Jason T. Wright
Publikováno v:
The Astrophysical Journal Letters, Vol 962, Iss 2, p L22 (2024)
We confirm TOI-4201 b as a transiting Jovian-mass planet orbiting an early M dwarf discovered by the Transiting Exoplanet Survey Satellite. Using ground-based photometry and precise radial velocities from NEID and the Planet Finder Spectrograph, we m
Externí odkaz:
https://doaj.org/article/9109bd2a3664411b840237a62f27c616
Autor:
Neda Hejazi, Ian J. M. Crossfield, Diogo Souto, Jonathan Brande, Thomas Nordlander, Emilio Marfil, Katia Cunha, David R. Coria, Zachary G. Maas, Alex S. Polanski, Natalie R. Hinkel, Joseph E. Hand
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 1, p 31 (2024)
We present an in-depth, high-resolution spectroscopic analysis of the M dwarf K2-18, which hosts a sub-Neptune exoplanet in its habitable zone. We show our technique to accurately normalize the observed spectrum, which is crucial for a proper spectra
Externí odkaz:
https://doaj.org/article/13afc9c616fc45589589256a99aa81c0
Autor:
Madison VanWyngarden, Ryan Cloutier
Publikováno v:
The Astronomical Journal, Vol 168, Iss 4, p 154 (2024)
Close-in planets smaller than Neptune form two distinct populations composed of rocky super-Earths and sub-Neptunes that may host primordial H/He envelopes. The origin of the radius valley separating these two planet populations remains an open quest
Externí odkaz:
https://doaj.org/article/08a698de829b4401ae3aee943212a1ab
Publikováno v:
The Astronomical Journal, Vol 168, Iss 4, p 155 (2024)
Hydrogen lines from forming planets are crucial for understanding planet formation. However, the number of planetary hydrogen line detections is still limited. Recent JWST/NIRSpec observations have detected Paschen and Brackett hydrogen lines at TWA
Externí odkaz:
https://doaj.org/article/e985bc4457c048f69cc265cb11462bb7
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 2, p 181 (2024)
For the origin of the radially concentrated solar system’s terrestrial planets, planet formation from a ring of solids at about 1 au from the Sun with convergent/suppressed type I migration is preferred. On the other hand, many super-Earths and sub
Externí odkaz:
https://doaj.org/article/8c03b24ed8534b4f97d85d4ca770bf59