Results 61 to 70 of about 885,801 (233)

Extrasolar planets [PDF]

Proceedings of the National Academy of Sciences, 2000
The first known extrasolar planet in orbit around a Sun-like star was discovered in 1995. This object, as well as over two dozen subsequently detected extrasolar planets, were all identified by observing periodic variations of the Doppler shift of light emitted by the stars to which they are bound.
Geoffrey W. Marcy, Shigeru Ida, Jack J. Lissauer   +2 more
openaire   +3 more sources

The hydrogen Lyman α line shape in the exospheres of terrestrial objects in the solar system

Frontiers in Astronomy and Space Sciences
The exospheres of all objects are mostly made of atomic hydrogen. Because the Sun is bright in Lyman α, the properties of the H atoms in the exospheres of certain terrestrial solar system objects can be studied by analyzing the resonantly scattered solar
Dolon Bhattacharyya, Edward M. B. Thiemann, Janet Machol, Janet Machol, Gonzalo Cucho-Padin, Gonzalo Cucho-Padin, Sabyasachi Chatterjee, Walter Harris, Edwin Mierkiewicz   +8 more
doaj   +1 more source

Environmental and economical ethics collide

Voices in Bioethics, 2020
In January 2020, during China’s COVID-19 outbreak, the NASA Earth Observatory captured aerial images indicating significantly lower emissions of nitrogen dioxide (NO2), a major air pollutant, across China’s mainland.[1] Scientists across the globe have ...
Camille Castelyn
doaj   +1 more source

Planet Formation and Disk-Planet Interactions [PDF]

, 2019
This review is based on lectures given at the 45th Saas-Fee Advanced Course 'From Protoplanetary Disks to Planet Formation' held in March 2015 in Les Diablerets, Switzerland. Starting with an overview of the main characterictics of the Solar System and extrasolar planets, we describe the planet formation process in terms of the sequential accretion ...
openaire   +3 more sources

Planet Signatures in Collisionally Active Debris Discs: scattered light images

, 2012
Planet perturbations are often invoked as a potential explanation for many spatial structures that have been imaged in debris discs. So far this issue has been mostly investigated with collisionless N-body numerical models. We numerically investigate how
Augereau, Augereau, Augereau, Augereau, Beauge, Boley, Charnoz, Chauvin, Chiang, Dawson, Dohnanyi, Ertel, Golimowski, Grigorieva, Kalas, Kenyon, Kenyon, Krist, Kuchner, Kuchner, Lagrange, Metchev, Moro-Martín, Mouillet, Mustill, Mustill, P. Thebault, Q. Kral, Quillen, Reche, S. Ertel, Schneider, Stark, Strubbe, Su, Takeuchi, Thalmann, Thebault, Thebault, Thebault, Thebault, Thebault, Wilner, Wisdom, Wolf, Wyatt, Wyatt, Wyatt   +47 more
core   +2 more sources

Origins of Eccentric Extrasolar Planets: Testing the Planet‐Planet Scattering Model [PDF]

The Astrophysical Journal, 2008
(Abridged) In planetary systems with two or more giant planets, dynamical instabilities can lead to collisions or ejections through strong planet--planet scattering. Previous studies for simple initial configurations with two equal-mass planets revealed some discrepancies between the results of numerical simulations and the observed orbital elements of
Eric B. Ford, Eric B. Ford, Frederic A. Rasio   +2 more
openaire   +3 more sources

Newly-Discovered Planets Orbiting HD~5319, HD~11506, HD~75784 and HD~10442 from the N2K Consortium [PDF]

, 2014
Initially designed to discover short-period planets, the N2K campaign has since evolved to discover new worlds at large separations from their host stars. Detecting such worlds will help determine the giant planet occurrence at semi-major axes beyond the
Brewer, John M., Fischer, Debra A., Giguere, Matthew J., Howard, Andrew W., Isaacson, Howard T., Johnson, John Asher, Payne, Matthew J.   +6 more
core   +3 more sources

A Hyper-Textual Interpretation of the Seven Planets` Motif Design in Seljuk Art (Case study «Enamel bowl» and book of «Aja'ib al-Makhluqat» by Zakariya al-Qazwini) [PDF]

پیکره
Introduction:The Seljuk era, was a prosperous time in case of dealing with art; during this time art reached to higher level, as numerous and diverse artworks with cosmological concepts were created, which represents the significance of cosmology in this
Alireza Azizi Yousefkand, Farnosh Shomeili, Mohamad Khazaie, Bahman NamvarMotlagh   +3 more
doaj   +1 more source

Stellar Flybys Interrupting Planet–Planet Scattering Generates Oort Planets [PDF]

The Astronomical Journal, 2019
Abstract Wide-orbit exoplanets are starting to be detected, and planetary formation models are under development to understand their properties. We propose a population of “Oort” planets around other stars, forming by means of a mechanism analogous to how the solar system’s Oort cloud of comets was populated.
Nora Bailey, Daniel Fabrycky
openaire   +3 more sources

The California-Kepler Survey V. Peas in a Pod: Planets in a Kepler Multi-planet System are Similar in Size and Regularly Spaced [PDF]

, 2018
We have established precise planet radii, semimajor axes, incident stellar fluxes, and stellar masses for 909 planets in 355 multi-planet systems discovered by Kepler.
Cargile, Phillip A., Cumming, Andrew, Fulton, Benjamin J., Hebb, Leslie, Hirsch, Lea A., Howard, Andrew W., Isaacson, Howard T., Marcy, Geoffrey W., Morton, Timothy D., Petigura, Erik A., Sinukoff, Evan J., Weiss, Lauren M., Winn, Joshua N.   +12 more
core   +2 more sources