Results 21 to 30 of about 464 (180)

The Origin of Earth's Mantle Nitrogen: Primordial or Early Biogeochemical Cycling?

Geochemistry, Geophysics, Geosystems, Volume 23, Issue 5, May 2022., 2022
Abstract Earth's mantle nitrogen (N) content is comparable to that found in its N‐rich atmosphere. Mantle N has been proposed to be primordial or sourced by later subduction, yet its origin has not been elucidated. Here we model N partitioning during the magma ocean stage following planet formation and the subsequent cycling between the surface and ...
H. Kurokawa, M. Laneuville, Y. Li, N. Zhang, Y. Fujii, H. Sakuraba, C. Houser, H. J. Cleaves II   +7 more
wiley   +1 more source

WARM SATURNS: ON THE NATURE OF RINGS AROUND EXTRASOLAR PLANETS THAT RESIDE INSIDE THE ICE LINE [PDF]

, 2011
We discuss the nature of rings that may exist around extrasolar planets. Taking the general properties of rings around the gas giants in the solar system, we infer the likely properties of rings around exoplanets that reside inside the ice line.
Hilke E. Schlichting, Chang, Philip, Philip Chang, Schlichting, Hilke E.   +3 more
core   +1 more source

Three regimes of extrasolar planet radius inferred from host star metallicities. [PDF]

Nature, 2014
Approximately half of the extrasolar planets (exoplanets) with radii less than four Earth radii are in orbits with short periods. Despite their sheer abundance, the compositions of such planets are largely unknown.
Buchhave LA, Bizzarro M, Latham DW, Sasselov D, Cochran WD, Endl M, Isaacson H, Juncher D, Marcy GW.   +8 more
europepmc   +2 more sources

Two Earth-sized planets orbiting Kepler-20 [PDF]

, 2011
Since the discovery of the first extrasolar giant planets around Sun-like stars[superscript 1, 2], evolving observational capabilities have brought us closer to the detection of true Earth analogues.
Ford, Eric B., Roger, L.A., Fressin, Francois, Ballard, S., Borucki, William J., Francois Fressin, Ciardi, D.R., Samuel N. Quinn, Shawn E. Seader, Latham, David W., Howell, Steve B., Charbonneau, David, Steve B. Howell, Susan E. Thompson, Matthew J. Holman, Torres, G., Holman, Matthew J., Ciardi, David R., Jean-Michel Désert, Geoffrey W. Marcy, Gautier, Thomas N., Jack J. Lissauer, Joseph D. Twicken, Rowe, Jason F., Still, Martin, Seager, Sara, Lars A. Buchhave, David G. Koch, Kamal Uddin, Latham, David, Sasselov, Dimitar D., Fergal Mullally, Charbonneau, D., Seader, Shawn E., Uddin, Kamal, David W. Latham, Henze, Christopher E., William J. Borucki, Thomas Barclay, Jason F. Rowe, Christopher E. Henze, Batalha, N.M., Twicken, Joseph D., Holman, Matthew, Dressing, Courtney D., Dimitar D. Sasselov, Ragozzine, Darin, Thompson, Susan E., Martin Still, Fressin, F., David R. Ciardi, Gautier III, Thomas N., Koch, David G., Sara Seager, Rowe, J.F., Rogers, Leslie A., Jenkins, Jon M., Jon M. Jenkins, Désert, Jean-Michel, Lissauer, Jack J., Marcy, Geoffrey W., Andrew Howard, Courtney D. Dressing, Ballard, Sarah, Batalha, Natalie M., Natalie M. Batalha, Sasselov, Dimitar, Bryson, S.T., Desert, Jean Michel, Buchhave, Lars C. Astrup, Borucki, W.J., Howard, Andrew, Quinn, Samuel N., Daniel C. Fabrycky, Barclay, Thomas, Mullally, Fergal, Thomas N. Gautier III, Bryson, Stephen T., Eric B. Ford, Rogers, Leslie Anne, Stephen T. Bryson, Guillermo Torres, Fabrycky, Daniel C., Darin Ragozzine, Sarah Ballard, Buchhave, Lars A., Leslie A. Rogers, Torres, Guillermo, David Charbonneau   +88 more
core   +1 more source

Anatomy of rocky planets formed by rapid pebble accretion III. Partitioning of volatiles between planetary core, mantle, and atmosphere

, 2023
Volatile molecules containing hydrogen, carbon, and nitrogen are key components of planetary atmospheres. In the pebble accretion model for rocky planet formation, these volatile species are accreted during the main planetary formation phase.
Martin Bizzarro, Schiller, Martin, Zhengbin Deng, Martin Schiller, Anders Johansen, Johansen, Anders, Deng, Zhengbin, Johansen, Anders,, Ronnet, Thomas, Bizzarro, Martin, Schiller, Martin,, Bizzarro, Martin,, Thomas Ronnet, Lund University., Deng, Zhengbin,   +14 more
core   +1 more source

The sustainability of habitability on terrestrial planets: Insights, questions, and needed measurements from Mars for understanding the evolution of Earth-like worlds

, 2018
What allows a planet to be both within a potentially habitable zone and sustain habitability over long geologic time? With the advent of exoplanetary astronomy and the ongoing discovery of terrestrial-type planets around other stars, our own solar system
Niles, P. B., Fischer, W. W., Rice, M. S., Wray, J. J., Toplis, M. J., Hayes, A. G., Herd, C. D. K., Cohen, B. A., Kerber, L., Stevenson, D. J., Horgan, B., Stewart, S. T., Golombek, M. P., Ehlmann, B. L., Fraeman, A. A., Usui, T., Yingst, R. A., Hamilton, V. E., Elkins-Tanton, L. T., Wordsworth, R. D., Zahnle, K. J., Yung, Y. L., Quantin-Nataf, C., Lunine, J. I., Edwards, C. S., Hu, R., Knutson, H. A., McCubbin, F. M., Johnson, J. R., Farley, K. A., Kasting, J. F., Stack, K. M., Andrews-Hanna, J., Kite, E. S., Kinch, K. M., Catling, D. C., Jakosky, B. M., Mahaffy, P. R., Anderson, F. S., Fassett, C. I., Mustard, J. F., Werner, S. C., Dressing, C. D., Christensen, P. R., Weiss, Benjamin P., Mangold, N.   +45 more
core   +2 more sources

Reliable Detections of Atmospheres on Rocky Exoplanets with Photometric JWST Phase Curves

The Astrophysical Journal Letters
The prevalence of atmospheres on rocky planets is one of the major questions in exoplanet astronomy, but there are currently no published unambiguous detections of atmospheres on any rocky exoplanets.
Mark Hammond, Claire Marie Guimond, Tim Lichtenberg, Harrison Nicholls, Chloe Fisher, Rafael Luque, Tobias G. Meier, Jake Taylor, Quentin Changeat, Lisa Dang, Hamish C. F. C. Hay, Oliver Herbort, Johanna Teske   +12 more
doaj   +1 more source

Autonomous Planetary Rover Navigation and Crater‐Based Map Augmentation for Path Planning and Rock Localization Using Space ROS

Engineering Reports, Volume 8, Issue 3, March 2026.
Autonomous planetary rovers operate in GPS‐denied, low‐texture, crater‐rich environments where traditional SLAM‐based navigation systems suffer from localization drift and unreliable obstacle handling. To address these challenges, this work proposes a Space‐ROS–based autonomous navigation framework integrating ROS2 with the NAV2 stack, RTAB‐Map visual ...
Imnul Haque Ruman Talukder, Hrittik Mural, S. M. Fahim Faisal, Avishak Talukdar, Shishir Chandra Das, Mumit Hassan   +5 more
wiley   +1 more source

JWST/NIRCam Transmission Spectroscopy of the Nearby Sub-Earth GJ 341b

The Astronomical Journal
We present a JWST/Near Infrared Camera (NIRCam) transmission spectrum from 3.9 to 5.0 μ m of the recently validated sub-Earth GJ 341b ( R _P = 0.92 R _⊕ , T _eq = 540 K) orbiting a nearby bright M1 star ( d = 10.4 pc, K _mag = 5.6).
James Kirk, Kevin B. Stevenson, Guangwei Fu, Jacob Lustig-Yaeger, Sarah E. Moran, Sarah Peacock, Munazza K. Alam, Natasha E. Batalha, Katherine A. Bennett, Junellie Gonzalez-Quiles, Mercedes López-Morales, Joshua D. Lothringer, Ryan J. MacDonald, E. M. May, L. C. Mayorga, Zafar Rustamkulov, David K. Sing, Kristin S. Sotzen, Jeff A. Valenti, Hannah R. Wakeford   +19 more
doaj   +1 more source

Formation of Asteroid (16) Psyche by a Giant Impact

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Asteroid (16) Psyche is the largest likely metal‐rich asteroid in the Solar System and the target of the NASA Psyche mission. The mission aims to determine whether the asteroid is the core of a differentiated planetesimal that lost its mantle via a giant impact.
Saverio Cambioni, Benjamin P. Weiss, Namya Baijal, Robert Melikyan, Erik Asphaug, John B. Biersteker, Richard P. Binzel, William F. Bottke, Samuel W. Courville, Linda T. Elkins‐Tanton, David J. Lawrence, José M. G. Merayo, Carol A. Raymond, Mark A. Wieczorek, Maria T. Zuber   +14 more
wiley   +1 more source