Results 51 to 60 of about 182,451 (170)

Making Extrasolar Planets From Solar Systems Via Dynamical Interactions

, 2010
Most stars form in some sort of stellar cluster or association. In such environments the number density of stars is much higher than in the solar neighbourhood, which means that close encounters between stars may be relatively common.
D. Malmberg, Malmberg, Daniel, Davies, Melvyn B, M. B. Davies, Davies, Melvyn B,   +4 more
core   +1 more source

From Earths to Super-Earths: Five New Small Planets Transiting M Dwarf Stars

The Astronomical Journal
Earth-sized planets transiting M dwarf stars present one of the best opportunities with current facilities for studying the atmospheric and bulk compositions of terrestrial worlds. Here, we statistically validate five new transiting Earth and super-Earth
Jonathan Gomez Barrientos, Heather A. Knutson, Morgan Saidel, Michael Greklek-McKeon, W. Garrett Levine, Nicholas Saunders, Howard Isaacson, Renyu Hu, Karen A. Collins, David R. Ciardi, Polina A. Budnikova, Dmitry V. Cheryasov, Samuel W. Yee, Diogo Souto, Aida Behmard, Akihiko Fukui, Avi Shporer, Akanksha Khandelwal, Bob Massey, Brice-Oliver Demory, Catherine A. Clark, Chris Stockdale, Emily A. Gilbert, Enric Palle, Francis P. Wilkin, Felipe Murgas, Francis Zong Lang, Ilse Plauchu-Frayn, Jessie L. Christiansen, Jon M. Jenkins, Joseph D. Twicken, Keith Horne, Michaël Gillon, Monika Lendl, Michael B. Lund, Norio Narita, Pam Rowden, Ramotholo Sefako, Richard P. Schwarz, Steven Giacalone, Urs Schroffenegger, Yilen Gómez Maqueo Chew   +41 more
doaj   +1 more source

An Analytical Model of Wavelength-dependent Opposition Surge in Emittance and Reflectance Spectroscopy of Airless Rocky Exoplanets

The Planetary Science Journal
Theoretical frameworks for reflection and emission spectroscopy of exoplanet surfaces are becoming increasingly important for the characterization of rocky exoplanets, especially with the rapid growth of the detected exoplanet population and ...
Leonardos Gkouvelis
doaj   +1 more source

The atmospheres of extrasolar planets [PDF]

, 2014
The discovery of extrasolar planets, or “exoplanets” – i.e., planets orbiting around other stars – may be seen as the major discovery of astronomy over the past two decades.
Thérèse Encrenaz, Encrenaz, Thérèse
core   +1 more source

A Formation-stage Bottleneck for Exomoons around Close-in Rocky Planets

The Astrophysical Journal
Massive moons around rocky exoplanets are expected outcomes of giant impacts, yet no exomoon has been securely confirmed. We address this problem using meshless finite-mass (MFM) simulations of giant impacts between differentiated rocky planets that ...
Rongxi Bi, Hongping Deng, Christian Reinhardt, Shangfei Liu, Yun Liu   +4 more
doaj   +1 more source

The influence of galactic cosmic rays on ion-neutral hydrocarbon chemistry in the upper atmospheres of free-floating exoplanets [PDF]

, 2014
The authors highlight financial support of the European Community under the FP7 by an ERC starting grant.Cosmic rays may be linked to the formation of volatiles necessary for prebiotic chemistry.
P. B. Rimmer, C. Bilger, Rimmer, P.B., Helling, C., Bilger, C., Ch. Helling   +5 more
core   +1 more source

Small and Close-in Planets are Uncommon Around A-type Stars

The Astronomical Journal
The Kepler and K2 missions enabled robust calculations of planet occurrence rates around FGKM-type stars. However, these missions observed too few stars with earlier spectral types to tightly constrain the occurrence rates of planets orbiting hotter ...
Steven Giacalone, Courtney D. Dressing
doaj   +1 more source

A New Database of Giant Impacts over a Wide Range of Masses and with Material Strength: A First Analysis of Outcomes

The Planetary Science Journal
In the late stage of terrestrial planet formation, planets are predicted to undergo pairwise collisions known as giant impacts. Here, we present a high-resolution database of giant impacts for differentiated colliding bodies of iron–silicate composition,
Alexandre Emsenhuber, Erik Asphaug, Saverio Cambioni, Travis S. J. Gabriel, Stephen R. Schwartz, Robert E. Melikyan, C. Adeene Denton   +6 more
doaj   +1 more source

Photosynthesis in Hydrogen-Dominated Atmospheres

Life, 2014
The diversity of extrasolar planets discovered in the last decade shows that we should not be constrained to look for life in environments similar to early or present-day Earth.
William Bains, Sara Seager, Andras Zsom
doaj   +1 more source

Migration and Extrasolar Terrestrial Planets: Watering the Planets

, 2012
International audienceSimulations of the compositions of extrasolar terrestrial planets have shown that migration of giant planets assists in producing "Earth-like" terrestrial planets and delivering water and other volatiles to terrestrial planets ...
Carter-Bond, J. C., O'Brien, D. P., Raymond, Sean N.   +2 more
core   +3 more sources