Results 51 to 60 of about 507,717 (322)

Singing Planets Don't Sing; They Speak

Musical Offerings, 2023
Ancient Greek philosophers conceived a theory called Music of the Spheres. This ancient theory progressed for almost one thousand years before finally proving itself untrustworthy.
Joanna R. Lauer
doaj   +1 more source

Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes [PDF]

, 2016
We present empirical measurements of the radii of 116 stars that host transiting planets. These radii are determined using only direct observables—the bolometric flux at Earth, the effective temperature, and the parallax provided by the Gaia first data ...
K. Stassun, K. Collins, B. S. G. V. University, Fisk University, O. University   +4 more
semanticscholar   +1 more source

An Objective Classification Scheme for Solar-System Bodies Based on Surface Gravity

Galaxies
We introduce succinct and objective definitions of the various classes of objects in the solar system. Unlike the formal definitions adopted by the International Astronomical Union in 2006, group separation is obtained from measured physical properties ...
Dimitris M. Christodoulou, Silas G. T. Laycock, Demosthenes Kazanas   +2 more
doaj   +1 more source

High-Sensitivity Seismometer Development for Lunar Applications

Sensors, 2023
Lunar seismology is a critical area of research, providing insights into the Moon’s internal structure, composition, and thermal history, as well as informing the design of safe and resilient habitats for future human settlements. This paper presents the
Leandro A. N. de Paula, Ronald S. Norton, Ho Jung Paik, Nicholas C. Schmerr, Paul R. Williamson, Talso C. P. Chui, Inseob Hahn   +6 more
doaj   +1 more source

Formation of Hot Planets by a combination of planet scattering, tidal circularization, and Kozai mechanism

, 2008
We have investigated the formation of close-in extrasolar giant planets through a coupling effect of mutual scattering, Kozai mechanism, and tidal circularization, by orbital integrations.
Ito T., M. Nagasawa, Narita N., S. Ida, T. Bessho   +4 more
core   +1 more source

Migrating Planets [PDF]

, 1998
A planet orbiting in a disk of planetesimals can experience an instability in which it migrates to smaller orbital radii. Resonant interactions between the planet and planetesimals remove angular momentum from the planetesimals, increasing their ...
Hansen, Brad, Holman, Matt, Murray, Norm, Tremaine, Scott   +3 more
core   +3 more sources

The California-Kepler Survey. II. Precise Physical Properties of 2025 Kepler Planets and Their Host Stars [PDF]

, 2017
We present stellar and planetary properties for 1305 Kepler Objects of Interest hosting 2025 planet candidates observed as part of the California-Kepler Survey. We combine spectroscopic constraints, presented in Paper I, with stellar interior modeling to
J. Johnson, E. Petigura, B. Fulton, G. Marcy, A. Howard, H. Isaacson, L. Hebb, P. Cargile, T. Morton, L. Weiss, J. Winn, L. Rogers, E. Sinukoff, L. Hirsch   +13 more
semanticscholar   +1 more source

Dynamical Constraints on the HR 8799 Planets with GPI [PDF]

Astronomical Journal, 2018
The HR 8799 system uniquely harbors four young super-Jupiters whose orbits can provide insights into the system’s dynamical history and constrain the masses of the planets themselves. Using the Gemini Planet Imager, we obtained down to one milliarcsecond
Jason J. Wang, J. Graham, R. Dawson, D. Fabrycky, R. J. Rosa, L. Pueyo, Q. Konopacky, B. Macintosh, C. Marois, C. Marois, E. Chiang, S. Ammons, P. Arriaga, V. Bailey, T. Barman, J. Bulger, J. Chilcote, T. Cotten, R. Doyon, G. Duchêne, T. Esposito, M. Fitzgerald, K. Follette, B. Gerard, B. Gerard, S. Goodsell, A. Greenbaum, P. Hibon, L. Hung, P. Ingraham, P. Kalas, P. Kalas, J. Larkin, J. Maire, F. Marchis, M. Marley, S. Metchev, S. Metchev, M. Millar-Blanchaer, E. Nielsen, R. Oppenheimer, D. Palmer, J. Patience, M. Perrin, L. Poyneer, A. Rajan, J. Rameau, F. Rantakyrö, J. Ruffio, D. Savransky, A. Schneider, A. Sivaramakrishnan, I. Song, R. Soummer, Sandrine Thomas, J. Wallace, K. Ward-Duong, S. Wiktorowicz, S. Wolff   +58 more
semanticscholar   +1 more source

Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing

FEBS Letters, EarlyView.
Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
wiley   +1 more source

Generation of electromagnetic radiation caused by the dynamics of charged dust particles in a simulated terrestrial environment

AIP Advances
Laboratory studies of electromagnetic signal generation as a result of charged dust particle collisions under simulated dynamics of the Earth’s atmosphere have been performed.
Mohamad E. Abdelaal, Igor V. Dokuchaev, Elena A. Malinovskaya, Yulia N. Izvekova, Andrey N. Lyash, Ilya A. Kuznetsov, Inna A. Shashkova, Andrey E. Dubov, Alexandra A. Kartasheva, Gennady G. Dolnikov, Alexander V. Zakharov   +10 more
doaj   +1 more source