Direct imaging of multiple planets orbiting the star HR 8799.
Christian Marois,Christian Marois,Christian Marois,Bruce Macintosh,Travis S. Barman,Barry Zuckerman,Inseok Song,Jennifer Patience,David Lafrenière,René Doyon +9 more
Reads0
Chats0
TLDR
High-contrast observations with the Keck and Gemini telescopes have revealed three planets orbiting the star HR 8799, with projected separations of 24, 38, and 68 astronomical units.Abstract:
Direct imaging of exoplanetary systems is a powerful technique that can reveal Jupiter-like planets in wide orbits, can enable detailed characterization of planetary atmospheres, and is a key step toward imaging Earth-like planets. Imaging detections are challenging because of the combined effect of small angular separation and large luminosity contrast between a planet and its host star. High-contrast observations with the Keck and Gemini telescopes have revealed three planets orbiting the star HR 8799, with projected separations of 24, 38, and 68 astronomical units. Multi-epoch data show counter clockwise orbital motion for all three imaged planets. The low luminosity of the companions and the estimated age of the system imply planetary masses between 5 and 13 times that of Jupiter. This system resembles a scaled-up version of the outer portion of our solar system.read more
Citations
More filters
Journal ArticleDOI
Circumstellar Debris Disks: Diagnosing the Unseen Perturber
TL;DR: In this paper, a stellar-mass perturber orbiting exterior to and inclined to the disk and exciting the disk particles' eccentricities and inclinations via the Kozai-Lidov mechanism was explored.
Journal ArticleDOI
Upper limits on protolunar disc masses using ALMA observations of directly imaged exoplanets
Sebastián Pérez,Sebastián Pérez,Sebastian Marino,S. Casassus,Clément Baruteau,Alice Zurlo,Christian Flores,Gael Chauvin,Gael Chauvin +8 more
TL;DR: In this article, the authors report on ALMA observations of four <40 Myr old stars with directly-imaged companions: PZ Tel, AB Pic, 51 Eri, and $\kappa$ And.
Journal ArticleDOI
Theoretical seismic properties of pre-main sequence gamma Doradus pulsators
TL;DR: In this paper, the authors studied the differences between the asteroseismic behaviour of PMS and MS gamma Dor pulsators as predicted by the current theory of stellar evolution and stability.
Journal ArticleDOI
Detectability of giant planets in protoplanetary disks by CO emission lines
TL;DR: In this article, the authors proposed an indirect method to detect Jovian planets by studying near infrared emission spectra originating in the protoplanetary disks around T Tauri stars.
Journal ArticleDOI
Dynamical models to explain observations with SPHERE in planetary systems with double debris belts
C. Lazzoni,C. Lazzoni,Silvano Desidera,Francesco Marzari,Francesco Marzari,Anthony Boccaletti,Maud Langlois,Maud Langlois,Dino Mesa,R. G. Gratton,Quentin Kral,N. Pawellek,N. Pawellek,N. Pawellek,Johan Olofsson,Johan Olofsson,Mickael Bonnefoy,Gael Chauvin,Anne-Marie Lagrange,Arthur Vigan,E. Sissa,Jacopo Antichi,Henning Avenhaus,Henning Avenhaus,Henning Avenhaus,Andrea Baruffolo,Jean-Loup Baudino,Jean-Loup Baudino,Andreas Bazzon,J. L. Beuzit,Beth Biller,Beth Biller,Mariangela Bonavita,Mariangela Bonavita,Wolfgang Brandner,Pietro Bruno,Esther Buenzli,F. Cantalloube,Enrico Cascone,Anthony Cheetham,Riccardo Claudi,M. Cudel,Sebastian Daemgen,V. De Caprio,Philippe Delorme,Daniela Fantinel,G. Farisato,M. Feldt,Raphaël Galicher,Ch. Ginski,Julien Girard,Enrico Giro,Markus Janson,Markus Janson,Janis Hagelberg,Th. Henning,S. Incorvaia,M. Kasper,M. Kasper,T. Kopytova,H. LeCoroller,Luigi Lessio,R. Ligi,Anne-Lise Maire,Francois Menard,Michael Meyer,Michael Meyer,J. Milli,David Mouillet,S. Peretti,C. Perrot,Daniel Rouan,M. Samland,Bernardo Salasnich,Graeme Salter,T. Schmidt,Salvo Scuderi,E. Sezestre,Massimo Turatto,Stéphane Udry,Francois Wildi,Alice Zurlo,Alice Zurlo +82 more
TL;DR: In this article, the authors investigated the possibility of the presence of multiple double-belts in gaps between double belts and showed that the apparent lack of planets in gaps could be explained by a system of two or more planets possibly of low mass and on eccentric orbits whose sizes are below the present detection limits.
References
More filters
Journal ArticleDOI
Object tracking: A survey
TL;DR: The goal of this article is to review the state-of-the-art tracking methods, classify them into different categories, and identify new trends to discuss the important issues related to tracking including the use of appropriate image features, selection of motion models, and detection of objects.
Journal ArticleDOI
Validation of the new Hipparcos reduction
TL;DR: In this article, a new reduction of the Hipparcos data was published, which claimed accuracies for nearly all stars brighter than magnitude Hp = 8 to be better, by up to a factor 4, than in the original catalog.
Journal ArticleDOI
Allen's astrophysical quantities
TL;DR: In this paper, Cox et al. introduce a general constant and unit model for general constants and units, and discuss atoms and molecules in the solar system, including Planets and Satellites.
Journal ArticleDOI
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458
TL;DR: In this article, the authors present evolutionary models for cool brown dwarfs and extra-solar giant planets and show that irradiation effects can substantially affect the radius of sub-jovian mass giant planets.
Journal ArticleDOI
Measuring Distance and Properties of the Milky Way’s Central Supermassive Black Hole with Stellar Orbits
Andrea M. Ghez,Samir Salim,Nevin N. Weinberg,Nevin N. Weinberg,Jessica R. Lu,Tuan Do,J. K. Dunn,Keith Matthews,Mark Morris,S. Yelda,Eric E. Becklin,T. Kremenek,Milos Milosavljevic,J. Naiman,J. Naiman +14 more
TL;DR: In this paper, the authors reported new precision measurements of the properties of our Galaxy's supermassive black hole, based on astrometric and radial velocity (RV; 2000-2007) measurements from the W. M. Keck 10m telescopes.