Results 61 to 70 of about 4,034,717 (373)

WFIRST Exoplanet Mass-measurement Method Finds a Planetary Mass of 39 ± 8 M⊕ for OGLE-2012-BLG-0950Lb [PDF]

Astronomical Journal, 2018
We present the analysis of the simultaneous high-resolution images from the Hubble Space Telescope and Keck adaptive optics system of the planetary event OGLE-2012-BLG-0950 that determine that the system consists of a 0.58 ± 0.04 host star orbited by a ...
A. Bhattacharya, J. Beaulieu, D. Bennett, J. Anderson, N. Koshimoto, J. Lu, V. Batista, J. Blackman, I. Bond, A. Fukui, C. Henderson, Y. Hirao, J. Marquette, P. Mróz, C. Ranc, A. Udalski   +15 more
semanticscholar   +1 more source

Early planet formation as a trigger for further planet formation [PDF]

, 1999
Recent discoveries of extrasolar planets at small orbital radii, or with significant eccentricities, indicate that interactions between massive planets and the disks of gas and dust from which they formed are vital for determining the final shape of ...
Armitage, Philip J., Hansen, Brad M. S.
core   +3 more sources

The Hawaii Infrared Parallax Program. III. 2MASS J0249–0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the β Pic Moving Group [PDF]

Astronomical Journal, 2018
We have discovered a wide planetary-mass companion to the β Pic moving group member 2MASS J02495639−0557352 (M6 vl-g) using Canada–France–Hawaii Telescope/WIRCam astrometry from the Hawaii Infrared Parallax Program.
T. Dupuy, Michael C. Liu, K. Allers, B. Biller, K. Kratter, A. Mann, E. Shkolnik, A. Kraus, W. Best   +8 more
semanticscholar   +1 more source

Two Wide Planetary-Mass Companions to Solar-Type Stars in Upper Scorpius [PDF]

, 2010
At wide separations, planetary-mass and brown dwarf companions to solar type stars occupy a curious region of parameters space not obviously linked to binary star formation or solar-system scale planet formation. These companions provide insight into the
A. Kraus, Allen, Allers, Anderson, Andrews, Andrews, Baraffe, Boley, Boss, Brandner, Béjar, Cameron, Cameron, Chabrier, Currie, de Zeeuw, F. Martinache, Fluks, Ghez, Golimowski, Grether, Haisch, Hernández, Hillenbrand, Kratter, Kraus, Kraus, Kraus, Kraus, Kraus, Kunkel, L. A. Hillenbrand, Lafrenière, Lafrenière, Lafrenière, Lafrenière, Leggett, Low, M. J. Ireland, Mamajek, Masciadri, Massarotti, Metchev, Monet, N. Law, Preibisch, Raghavan, Sartoretti, Schlegel, Scholz, Zacharias   +50 more
core   +2 more sources

Quantifying the Key Factors Affecting the Escape of Planetary Atmospheres

The Astrophysical Journal, 2023
The habitability of Earth-like planets is an increasingly important subject in astrophysics and in planetary sciences. Atmospheric escape plays a vital role in the evolution of the habitability of Earth-like planets.
J. Luo, H.-Q. He, G.-S. Tong, Jiao Li
doaj   +1 more source

A Planetary Mass Companion to the K0 Giant HD 17092 [PDF]

, 2007
We report the discovery of a substellar-mass companion to the K0-giant HD 17092 with the Hobby-Eberly Telescope. In the absence of any correlation of the observed 360-day periodicity with the standard indicators of stellar activity, the observed radial ...
A. Niedzielski, A. Wolszczan, Alonso A., Benz W., C. R. Gelino, Cannon A. J., de Medeiros J. R., G. Maciejewski, G. Nowak, Hog E., L. W. Ramsey, M. Konacki, M. Shao, M. Shetrone, Stumpff P.   +14 more
core   +2 more sources

Giant impact, planetary merger, and diversity of planetary-core mass [PDF]

Proceedings of the International Astronomical Union, 2007
AbstractTransit observations indicate a large dispersion in the internal structure among the known gas giants. This is a big challenge to the conventional sequential planetary formation scenario because the diversity is inconsistent with the expectation of some well defined critical condition for the onset of gas accretion in this scenario.
S.-L. Li, Craig B. Agnor, Douglas N. C. Lin   +2 more
openaire   +1 more source

Orbital Motion of the Wide Planetary-mass Companion GSC 6214-210 b: No Evidence for Dynamical Scattering [PDF]

Astronomical Journal, 2018
Direct-imaging exoplanet surveys have discovered a class of 5–20 substellar companions at separations >100 au from their host stars, which present a challenge to planet and star formation models.
L. Pearce, A. Kraus, T. Dupuy, M. Ireland, A. Rizzuto, B. Bowler, Eloise K Birchall, A. Wallace   +7 more
semanticscholar   +1 more source

Filling Factors and Ionized Masses of Planetary Nebulae [PDF]

Symposium - International Astronomical Union, 1993
We present a study on the filling factors and ionized masses of four sets of galactic and extra–galactic planetary nebulae (PNe) at known distances. The calculation of filling factors and ionized masses has been pursued as to get a deeper insight on the evolution of this class of objects.
Letizia Stanghellini, Francesca R. Boffi
openaire   +4 more sources

Mass transport in a moist planetary climate model [PDF]

Astronomy & Astrophysics, 2022
Planetary climate models (PCMs) are developed to explore planetary climates other than that of the Earth. Therefore, the methods implemented need to be suitable for a large diversity of conditions. Every planet with a significant atmosphere has condensible cycles (e.g. the hydrological cycle), which can play an essential role in the planet’s appearance
openaire   +3 more sources