Results 61 to 70 of about 176,490 (172)

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

Two Extrasolar Planets from the Anglo‐Australian Planet Search

, 2002
We report the detection of two new extrasolar planets from the Anglo-Australian Planet Search around the stars HD 142 and HD 23079. The planet orbiting HD 142 has an orbital period of just under 1 yr, while that orbiting HD 23079 has a period of just ...
C. G. Tinney, R. Paul Butler, Marcy, Geoffrey W., Chris McCarthy, Brad D. Carter, Tinney, C. G., Hugh R. A. Jones, Geoffrey W. Marcy, Alan J. Penny, Jones, Hugh R. A., Penny, Alan J., Carter, Brad D., McCarthy, Chris, Butler, R. Paul   +13 more
core   +1 more source

Spectroscopic Monitoring of Metal Lines in Polluted White Dwarfs

The Astrophysical Journal
The disruption and accretion of planetary material onto white dwarfs are expected to be inherently dynamic and stochastic, potentially driving variability in the accretion rate and therefore the shape and depth of the photospheric metal absorption lines.
Laura K. Rogers, Michael M. Shara, Amy Bonsor, Siyi Xu, Érika Le Bourdais, Patrick Dufour, John Debes, Omri Nolan, Ted von Hippel, Erik Dennihy, Simon Hodgkin, Andrew Swan, Mariona Badenas-Agusti, Mark C. Wyatt, Tim Cunningham   +14 more
doaj   +1 more source

Single-mode fiber length for wavefront filtering

, 2008
Stellar nulling interferometry offers the possibility of direct imaging of extrasolar planets necessary for the detection of extra-terrestrial life. Achieving optimum performance from the interferometers requires that the wavefronts of light reaching the
Dasgupta, Sonali, Broderick, N.G.R., Richardson, D.J.   +2 more
core   +1 more source

Mass–Radius Relationships and Contraction of Condensed Planets by Cooling or Despinning

The Astrophysical Journal
Condensed planets contract or expand as their temperature changes. With the exception of the effect of phase changes, this phenomenon is generally interpreted as being solely related to the thermal expansivity of the planet’s components. However, changes
Yanick Ricard, Frédéric Chambat
doaj   +1 more source

Probing Cold-to-temperate Exoplanetary Atmospheres: The Role of Water Condensation on Surface Identification with JWST

The Astrophysical Journal
Understanding the surface temperature and interior structure of cold-to-temperate sub-Neptunes is critical for assessing their habitability, yet direct observations are challenging.
Ziyu Huang, Xinting Yu, Shang-Min Tsai, Julianne I. Moses, Kazumasa Ohno, Joshua Krissansen-Totton, Xi Zhang, Jonathan J. Fortney   +7 more
doaj   +1 more source

The Effect of Guide Star Variability on PLATO Pointing Stability

The Astronomical Journal
The main science goal of the PLAnetary Transits and Oscillations of stars (PLATO) is to detect and characterize extrasolar planets, including terrestrial planets in the habitable zone (HZ) of their host stars.
Sam Bowling, R. Lieu, D. G. Griessbach, N. Jannsen, J. Cabrera, C. Paproth, H. Rauer, R. Heller, C. Jiang   +8 more
doaj   +1 more source

Unveiling the Interior Structure and Thermal Evolution of Super-Earth GJ 486b

The Astrophysical Journal
Recent ground- and space-based surveys have shown that planets between Earth and Neptune in size, known as “super-Earths,” are among the most frequently found planets in the Galaxy. Although the JWST era has provided high-quality atmospheric data on many
Chandan K. Sahu, Liton Majumdar, Sudipta Mridha, Harshit Krishna   +3 more
doaj   +1 more source

Accelerating Giant-impact Simulations with Machine Learning

The Astrophysical Journal
Constraining planet-formation models based on the observed exoplanet population requires generating large samples of synthetic planetary systems, which can be computationally prohibitive.
Caleb Lammers, Miles Cranmer, Sam Hadden, Shirley Ho, Norman Murray, Daniel Tamayo   +5 more
doaj   +1 more source

The Persistent Thermal Anomalies in Rocky Worlds

The Astrophysical Journal
Observing the dayside thermal emissions of rocky exoplanets provides essential insights into their compositions and the presence of atmospheres. Even though no conclusive evidence has been found for atmospheres on small rocky exoplanets orbiting M dwarfs,
Zifan Lin, Tansu Daylan
doaj   +1 more source