Results 61 to 70 of about 2,175 (190)

The Not-so Dramatic Effect of Advective Flows on Gas Accretion

The Astrophysical Journal
Super-Earths and mini-Neptunes are the most common types of exoplanets discovered, yet the physics of their formation are still debated. Standard core accretion models in gas-rich environments find that typical mini-Neptune mass planets would blow up ...
Vincent Savignac, Eve J. Lee
doaj   +1 more source

Corotation‐Bounce Resonance of Ions in Jupiter's Magnetosphere

Geophysical Research Letters, Volume 52, Issue 3, 16 February 2025.
Abstract Banded energy distributions of H+, O++, S+++, and O+ or S++ ions between 100 eV and ∼20 keV are consistently observed in Jupiter's magnetosphere mapping to M‐shells between M = 10–20. The bands correspond to flux enhancements at similar speeds for different ion species, providing the first evidence of simultaneous bounce‐resonant acceleration ...
Y. Sarkango, J. R. Szalay, P. A. Damiano, A. H. Sulaiman, P. A. Delamere, J. Saur, D. J. McComas, R. W. Ebert, F. Allegrini   +8 more
wiley   +1 more source

New Insights into the Internal Structure of GJ 1214 b Informed by JWST

The Astrophysical Journal Letters
Recent JWST observations of the sub-Neptune GJ 1214 b suggest that it hosts a high-metallicity (≳100× solar), hazy atmosphere. Emission spectra of the planet show molecular absorption features, most likely due to atmospheric H _2 O.
Matthew C. Nixon, Anjali A. A. Piette, Eliza M.-R. Kempton, Peter Gao, Jacob L. Bean, Maria E. Steinrueck, Alexandra S. Mahajan, Jason D. Eastman, Michael Zhang, Leslie A. Rogers   +9 more
doaj   +1 more source

NEID Reveals That the Young Warm Neptune TOI-2076 b Has a Low Obliquity

The Astrophysical Journal Letters, 2023
TOI-2076 b is a sub-Neptune-sized planet ( R = 2.39 ± 0.10 R _⊕ ) that transits a young (204 ± 50 MYr) bright ( V = 9.2) K-dwarf hosting a system of three transiting planets.
Robert C. Frazier, Gudmundur Stefánsson, Suvrath Mahadevan, Samuel W. Yee, Caleb I. Cañas, Joshua N. Winn, Jacob Luhn, Fei Dai, Lauren Doyle, Heather Cegla, Shubham Kanodia, Paul Robertson, John Wisniewski, Chad F. Bender, Jiayin Dong, Arvind F. Gupta, Samuel Halverson, Suzanne Hawley, Leslie Hebb, Rae Holcomb, Adam Kowalski, Jessica Libby-Roberts, Andrea S. J. Lin, Michael W. McElwain, Joe P. Ninan, Cristobal Petrovich, Arpita Roy, Christian Schwab, Ryan C. Terrien, Jason T. Wright   +29 more
doaj   +1 more source

An upper boundary in the mass-metallicity plane of exo-Neptunes

, 2016
With the progress of detection techniques, the number of low-mass and small-size exoplanets is increasing rapidly. However their characteristics and formation mechanisms are not yet fully understood.
Bouchy, François, Courcol, Bastien, Deleuil, Magali   +2 more
core   +4 more sources

Superhabitable Planets Around Mid‐Type K Dwarf Stars Enhance Simulated JWST Observability and Surface Habitability

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT In our search for life beyond the Solar System, certain planetary bodies may be more conducive to life than Earth. However, the observability of these “superhabitable” (SH) planets in the habitable zones around K dwarf stars has not been fully modeled. This study addresses this gap by modeling the atmospheres of SH exoplanets.
Iva Vilović, Jayesh Goyal, René Heller, Fanny Marie von Schauenburg   +3 more
wiley   +1 more source

The TESS-Keck Survey. XXII. A Sub-Neptune Orbiting TOI-1437

The Astronomical Journal
Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence in our own solar system, we rely on demographics of exoplanets to better ...
Daria Pidhorodetska, Emily A. Gilbert, Stephen R. Kane, Thomas Barclay, Alex S. Polanski, Michelle L. Hill, Keivan G. Stassun, Steven Giacalone, David R. Ciardi, Andrew W. Boyle, Steve B. Howell, Jorge Lillo-Box, Mason G. MacDougall, Tara Fetherolf, Natalie M. Batalha, Ian J. M. Crossfield, Courtney Dressing, Benjamin Fulton, Andrew W. Howard, Daniel Huber, Howard Isaacson, Erik A. Petigura, Paul Robertson, Lauren M. Weiss, Isabel Angelo, Corey Beard, Aida Behmard, Sarah Blunt, Casey L. Brinkman, Ashley Chontos, Fei Dai, Paul A. Dalba, Rae Holcomb, Jack Lubin, Andrew W. Mayo, Joseph M. Akana Murphy, Malena Rice, Ryan Rubenzahl, Nicholas Scarsdale, Emma V. Turtelboom, Dakotah Tyler, Judah Van Zandt, Edward W. Schwieterman   +42 more
doaj   +1 more source

Formation of Super-Earths

, 2018
Super-Earths are the most abundant planets known to date and are characterized by having sizes between that of Earth and Neptune, typical orbital periods of less than 100 days and gaseous envelopes that are often massive enough to significantly ...
Andre Izidoro, Angie Wolfgang, Benjamin J. Fulton, Brad M. S. Hansen, Chris W. Ormel, Chris W. Ormel, D Powell, Daniel C. Fabrycky, Eric D. Lopez, Eric D. Lopez, Eric D. Lopez, France Allard, François Fressin, Gennaro D'Angelo, Geoffrey W. Marcy, H Rein, HE Schlichting, Howard Chen, James E. Owen, Jeffrey Fung, JH Steffen, Katherine M. Deck, L Tu, Leslie A. Rogers, LM Weiss, M. Ikoma, Niraj K. Inamdar, Niraj K. Inamdar, Owen R. Lehmer, Peter Goldreich, R Boekel van, Rebekah I. Dawson, RR Rafikov, S Seager, Sheng Jin, Sivan Ginzburg, Sivan Ginzburg, SN Raymond, Y Wu, Yuval Greenzweig   +39 more
core   +1 more source

On the Nature of Small Planets around the Coolest Kepler Stars [PDF]

, 2011
We constrain the densities of Earth- to Neptune-size planets around very cool (Te =3660-4660K) Kepler stars by comparing 1202 Keck/HIRES radial velocity measurements of 150 nearby stars to a model based on Kepler candidate planet radii and a power-law ...
Andrew W. Mann, Basri, Batalha, Batalha, Bean, Bond, Borucki, Brown, Croll, Debra A. Fischer, Demarque, Di Benedetto, Désert, Eric Gaidos, Fortney, Gaudi, Hartman, Hatzes, Howard, Huber, Isaacson, Jackson, Johnson, Kennedy, Koch, Lada, Laughlin, Lee, Lissauer, Lépine, Lépine, Mamajek, Moorhead, Morton, Muirhead, Pierrehumbert, Rogers, Seager, Sébastien Lépine, Verner, Winn, Wolfgang   +41 more
core   +3 more sources

Initial Thermal States of Super‐Earth Exoplanets and Implications for Early Dynamos

Journal of Geophysical Research: Planets, Volume 130, Issue 2, February 2025.
Abstract The accretion of Earth and the formation of a metallic core released a large amount of primordial heat and may have enabled its evolution into a habitable world. Metal‐silicate segregation likely occurs in super‐Earth exoplanets as well, but its influence on their initial thermal states has not been fully examined.
Nathaniel I. White, Jie Li
wiley   +1 more source