scholarly journals The Dynamics of the HD 12661 Extrasolar Planetary System

2005 ◽  
Vol 628 (2) ◽  
pp. 1006-1013 ◽  
Author(s):  
Adrian Rodriguez ◽  
Tabare Gallardo
Keyword(s):  
Planetary System ◽  
Extrasolar Planetary System

scholarly journals New HST data and modeling reveal a massive planetesimal collision around Fomalhaut

2020 ◽  
Vol 117 (18) ◽  
pp. 9712-9722 ◽  
Author(s):  
András Gáspár ◽  
George H. Rieke
Keyword(s):  
Planetary System ◽  
Hubble Space Telescope ◽  
Dust Cloud ◽  
Planetary Systems ◽  
Orbital Evolution ◽  
Published Data ◽  
Space Telescope ◽  
Gravitational Perturbations ◽  
Extrasolar Planetary System

The apparent detection of an exoplanet orbiting Fomalhaut was announced in 2008. However, subsequent observations of Fomalhaut b raised questions about its status: Unlike other exoplanets, it is bright in the optical and nondetected in the infrared, and its orbit appears to cross the debris ring around the star without the expected gravitational perturbations. We revisit previously published data and analyze additional Hubble Space Telescope (HST) data, finding that the source is likely on a radial trajectory and has faded and become extended. Dynamical and collisional modeling of a recently produced dust cloud yields results consistent with the observations. Fomalhaut b appears to be a directly imaged catastrophic collision between two large planetesimals in an extrasolar planetary system. Similar events should be very rare in quiescent planetary systems of the age of Fomalhaut, suggesting that we are possibly witnessing the effects of gravitational stirring due to the orbital evolution of hypothetical planet(s) around the star.

scholarly journals Possible scenarios for eccentricity evolution in the extrasolar planetary system HD 181433

2013 ◽  
Vol 433 (4) ◽  
pp. 3190-3207 ◽  
Author(s):  
Giammarco Campanella ◽  
Richard P. Nelson ◽  
Craig B. Agnor
Keyword(s):  
Planetary System ◽  
Extrasolar Planetary System

scholarly journals A new analysis of the GJ581 extrasolar planetary system

2012 ◽  
Vol 113 (1) ◽  
pp. 49-62 ◽  
Author(s):  
M. Tadeu dos Santos ◽  
G. G. Silva ◽  
S. Ferraz-Mello ◽  
T. A. Michtchenko
Keyword(s):  
Planetary System ◽  
Extrasolar Planetary System

scholarly journals An extrasolar planetary system with three Neptune-mass planets

Nature ◽  
2006 ◽  
Vol 441 (7091) ◽  
pp. 305-309 ◽  
Author(s):  
Christophe Lovis ◽  
Michel Mayor ◽  
Francesco Pepe ◽  
Yann Alibert ◽  
Willy Benz ◽  
...  
Keyword(s):  
Planetary System ◽  
Extrasolar Planetary System

HST-COS observations of the transiting extrasolar planetary system HD 209458b

2011 ◽  
pp. 25-32
Author(s):  
Kevin France ◽  
Jeffrey L. Linsky ◽  
Hao Yang ◽  
John T. Stocke ◽  
Cynthia S. Froning
Keyword(s):  
Planetary System ◽  
Extrasolar Planetary System

scholarly journals HD 83443: a system with two Saturns

2004 ◽  
Vol 202 ◽  
pp. 84-86 ◽  
Author(s):  
M. Mayor ◽  
D. Naef ◽  
F. Pepe ◽  
D. Queloz ◽  
N. C. Santos ◽  
...  
Keyword(s):  
Planetary System ◽  
Major Axis ◽  
Giant Planets ◽  
Outer Planet ◽  
Semi Major Axis ◽  
Dynamical Study ◽  
Low Mass ◽  
The Stability ◽  
Extrasolar Planetary System

We report the discovery of an extrasolar planetary system with two Saturnian planets around the star HD 83443. The new planetary system is unusual by more than one aspect, as it contains two very low–mass gaseous giant planets, both on very tight orbits. Among the planets detected so far, the inner planet has the smallest semi–major axis (0.038 AU) and period (2.985 days) whereas the outer planet is the lightest one with m2 sin i = 0.53 MSat. A preliminary dynamical study confirms the stability of the system.

scholarly journals Searches for Pulsar Planetary Systems

2004 ◽  
Vol 213 ◽  
pp. 101-106
Author(s):  
T. Joseph W. Lazio ◽  
J. Fischer ◽  
James M. Cordes
Keyword(s):  
Planetary System ◽  
Planetary Systems ◽  
Optimization Method ◽  
Natural World ◽  
Function Optimization ◽  
Infrared Observations ◽  
Timing Data ◽  
Pulse Timing ◽  
Extrasolar Planetary System ◽  
Near Future

The first extrasolar planetary system was discovered around the pulsar PSR B1257+12, and the planets therein remain the lowest mass exoplanets known (with one whose mass is of order a lunar mass). Pulsar planetary systems will remain the only extrasolar planetary systems within which terrestrial-mass planets can be detected for the near future, and multiple pulsar planetary systems would provide strong circumstantial evidence that terrestrial-mass planets are ubiquitous, and possibly information about the formation of terrestrial-mass planets. We summarize two searches for planetary or proto-planetary systems around pulsars. The first is a series of infrared observations of millisecond pulsars in which the objective is to detect (proto-planetary) disks. The second uses a genetic algorithm—a function optimization method based on evolutionary processes in the natural world—to search for the signatures of planetary perturbations in pulse timing data.

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