Results 111 to 120 of about 1,052,175 (256)

Prebiotic Vitamin B3 Synthesis in Carbonaceous Planetesimals

ChemPlusChem, Volume 89, Issue 4, April 2024.
Aqueous chemistry inside meteorite parent bodies allows the formation of prebiotic molecules crucial for all life in the early solar system. We present a reaction mechanism suitable for vitamin B3 synthesis in this environment, which is experimentally verified in the literature.
Klaus Paschek, Mijin Lee, Dmitry A. Semenov, Thomas K. Henning   +3 more
wiley   +1 more source

Insight into the Formation of β Pic b through the Composition of Its Parent Protoplanetary Disk as Revealed by the β Pic Moving Group Member HD 181327

The Astronomical Journal
It has been suggested that β Pic b has a supersolar metallicity and subsolar C/O ratio. Assuming solar carbon and oxygen abundances for the star β Pic and therefore the planet’s parent protoplanetary disk, β Pic b’s C/O ratio suggests that it formed via ...
Henrique Reggiani, Jhon Yana Galarza, Kevin C. Schlaufman, David K. Sing, Brian F. Healy, Andrew McWilliam, Joshua D. Lothringer, Laurent Pueyo   +7 more
doaj   +1 more source

The fate of moons of close-in giant exoplanets [PDF]

, 2010
We show that the fate of moons of a close-in giant planet is mainly determined by the migration history of the planet in the protoplanetary disk. As the planet migrates in the disk from beyond the snow line towards a multi-day period orbit, the formed and forming moons become unstable as the planet's sphere of influence shrinks.
arxiv   +1 more source

A Post‐Launch Summary of the Science of NASA's Psyche Mission

AGU Advances, Volume 5, Issue 2, April 2024.
Abstract Astronomical observations indicate that asteroid (16) Psyche is a large, high‐density (likely >3,400 kg·m−3), metal‐rich (30–55 vol. %) asteroid. Psyche may be remnant core material or it could be a primordial, undifferentiated metal‐rich object.
Steven D. Dibb, Erik Asphaug, James F. Bell, Richard P. Binzel, William F. Bottke, Saverio Cambioni, John M. Christoph, Linda T. Elkins‐Tanton, Ralf Jaumann, David J. Lawrence, Rona Oran, Joseph G. O’Rourke, Carol Polansky, Benjamin P. Weiss, Mark Wieczorek, David. A. Williams   +15 more
wiley   +1 more source

Planet Migration [PDF]

arXiv, 2010
Planet migration is the process by which a planet's orbital radius changes in time. The main agent for causing gas giant planet migration is the gravitational interaction of the young planet with the gaseous disk from which it forms. We describe the migration rates resulting from these interactions based on a simple model for disk properties.
arxiv  

Evidence of Possible Spin-Orbit Misalignment Along the Line of Sight in Transiting Exoplanet Systems

, 2010
Of the 26 transiting exoplanet systems with measurements of the Rossiter-McLaughlin (RM) effect, eight have now been found to be significantly spin-orbit misaligned in the plane of the sky. Unfortunately, the RM effect only measures the angle between the
Anderson, Bakos, Bakos, Bakos, Bakos, Bakos, Beck, Borucki, Bouchy, Buchhave, Burke, Burke, Cameron, Chatterjee, Dunham, Fabrycky, Fabrycky, Fernandez, Fischer, Fischer, Fossey, Gaudi, Gaudi, Gizon, Hartman, Hebb, Hebb, Hellier, Ida, Ida, Irwin, Jenkins, Johns-Krull, Johnson, Jurić, Keppens, Kevin C. Schlaufman, Koch, Kovács, Latham, Latham, Laughlin, Lister, Marcy, Matt, Maxted, McCullough, McCullough, McNally, Mestel, Nagasawa, Narita, Narita, Narita, Narita, Noyes, Nutzman, Ogihara, Ohta, Pál, Pál, Queloz, Sato, Shporer, Smalley, Southworth, Sozzetti, Sozzetti, Terquem, Thommes, Torres, Torres, Torres, Valenti, West, Winn, Winn, Winn, Winn, Winn, Yu   +80 more
core   +1 more source

Exomoon Phase Curves: Toroidal Exosphere Simulations of Exo‐Ios Orbiting 8 Exoplanets in Alkali Spectroscopy

Journal of Geophysical Research: Planets, Volume 129, Issue 3, March 2024.
Abstract Toroidal atmospheres and exospheres characterized at exoplanets may be fueled by volcanically active exomoons, often referred to as exo‐Ios. We study the neutral outgassing and volatile evolution of a close‐orbiting, evaporating satellite at eight candidate exoplanet‐exomoon systems WASP‐49,‐96,‐69,‐17 b, XO‐2N b, HAT‐P‐1 b, HD‐189733 b, and ...
M. Meyer zu Westram, A. V. Oza, A. Galli
wiley   +1 more source

The Unusual M-dwarf Warm Jupiter TOI-1899 b: Refinement of Orbital and Planetary Parameters

The Astronomical Journal, 2023
TOI-1899 b is a rare exoplanet, a temperate warm Jupiter orbiting an M dwarf, first discovered by Cañas et al. (2020) from a TESS single-transit event.
Andrea S. J. Lin, Jessica E. Libby-Roberts, Jaime A. Alvarado-Montes, Caleb I. Cañas, Shubham Kanodia, Te Han, Leslie Hebb, Eric L. N. Jensen, Suvrath Mahadevan, Luke C. Powers, Tera N. Swaby, John Wisniewski, Corey Beard, Chad F. Bender, Cullen H. Blake, William D. Cochran, Scott A. Diddams, Robert C. Frazier, Connor Fredrick, Michael Gully-Santiago, Samuel Halverson, Sarah E. Logsdon, Michael W. McElwain, Caroline Morley, Joe P. Ninan, Jayadev Rajagopal, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab, Guðmundur Stefánsson, Daniel J. Stevens, Ryan C. Terrien, Jason T. Wright   +33 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

Learning to see, seeing to learn: Impacts of an online tool on volunteers' observational practices during aquatic macroinvertebrate identification

Science Education, Volume 108, Issue 1, Page 332-364, January 2024.
Abstract Scientific observation is a disciplinary‐informed way of looking at the world that requires the coordination of domain knowledge and perceptual skills with specialized tools and techniques to systematically identify objects, organisms, specimens, or phenomena of interest.
Marti Louw, Camellia W. Sanford‐Dolly
wiley   +1 more source