Topic
Double planet
About: Double planet is a research topic. Over the lifetime, 176 publications have been published within this topic receiving 2139 citations. The topic is also known as: binary planet.
Papers published on a yearly basis
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Papers
TL;DR: A transiting circumbinary planet (PH1b) was discovered by volunteers searching the first six Quarters of publicly available Kepler data as part of the Planet Hunters citizen science project as mentioned in this paper.
Abstract: We report the discovery and confirmation of a transiting circumbinary planet (PH1b) around KIC 4862625, an eclipsing binary in the Kepler field. The planet was discovered by volunteers searching the first six Quarters of publicly available Kepler data as part of the Planet Hunters citizen science project. Transits of the planet across the larger and brighter of the eclipsing stars are detectable by visual inspection every ~137 days, with seven transits identified in Quarters 1-11. The physical and orbital parameters of both the host stars and planet were obtained via a photometric-dynamical model, simultaneously fitting both the measured radial velocities and the Kepler light curve of KIC 4862625. The 6.18 ± 0.17 R_⊕ planet orbits outside the 20 day orbit of an eclipsing binary consisting of an F dwarf (1.734 ± 0.044 R_☉, 1.528 ± 0.087 M_☉) and M dwarf (0.378 ± 0.023 R_☉, 0.408 ± 0.024 M_☉). For the planet, we find an upper mass limit of 169 M_⊕ (0.531 Jupiter masses) at the 99.7% confidence level. With a radius and mass less than that of Jupiter, PH1b is well within the planetary regime. Outside the planet's orbit, at ~1000 AU, a previously unknown visual binary has been identified that is likely bound to the planetary system, making this the first known case of a quadruple star system with a transiting planet.
238 citations
TL;DR: In this paper, the authors compared the relative sizes of each planet to the size of every other planet within a given planetary system after correcting the sample for detection and geometric biases and found that the larger planet is most often the planet with the longer period.
Abstract: We present a study of the relative sizes of planets within the multiple candidate systems discovered with the $Kepler$ mission. We have compared the size of each planet to the size of every other planet within a given planetary system after correcting the sample for detection and geometric biases. We find that for planet-pairs for which one or both objects is approximately Neptune-sized or larger, the larger planet is most often the planet with the longer period. No such size--location correlation is seen for pairs of planets when both planets are smaller than Neptune. Specifically, if at least one planet in a planet-pair has a radius of $\gtrsim 3R_\oplus$, $68\pm 6%$ of the planet pairs have the inner planet smaller than the outer planet, while no preferred sequential ordering of the planets is observed if both planets in a pair are smaller than $\lesssim3 R_\oplus$.
81 citations
TL;DR: In this article, the Geneva group has reported two Saturn-mass planets orbiting HD 83443 (K0 V) with periods of 2.98 and 29.8 days, respectively.
Abstract: The Geneva group has reported two Saturn-mass planets orbiting HD 83443 (K0 V) with periods of 2.98 and 29.8 days. The two planets have raised interest in their dynamics because of the possible 10 : 1 orbital resonance and the strong gravitational interactions. We report precise Doppler measurements of HD 83443 obtained with the Keck/HIRES and the Anglo-Australian Telescope (AAT) UCLES spectrometers. These measurements strongly confirm the inner planet with a period of 2.985 days, with orbital parameters in very good agreement with those of the Geneva group. However, these Doppler measurements show no evidence of the outer planet, at thresholds of one-fourth (3 m s � 1 ) of the reported velocity amplitude of 13.8 m s � 1 . Thus, the existence of the outer planet is in question. Indeed, the current Doppler measurements reveal no evidence of any second planet with a period less than a year. Subject headings: planetary systems — stars: individual (HD 83443)
75 citations
University of São Paulo1, German Aerospace Center2, Institut d'Astrophysique de Paris3, University of Geneva4, Janssen Pharmaceutica5, University of Paris-Sud6, Aarhus University7, European Space Research and Technology Centre8, Spanish National Research Council9, University of La Laguna10, University of Vienna11, University of Liège12, Austrian Academy of Sciences13, Tel Aviv University14, Paris Diderot University15
TL;DR: The CoRoT-20b is a new giant planet discovered in this article, with a mass of 4.24 ǫ± 0.23 M Jup and a radius of 0.04 R Jup.
Abstract: We report the discovery by the CoRoT space mission of a new giant planet, CoRoT-20b. The planet has a mass of 4.24 ± 0.23 M Jup and a radius of 0.84 ± 0.04 R Jup . With a mean density of 8.87 ± 1.10 g cm-3 , it is among the most compact planets known so far. Evolutionary models for the planet suggest a mass of heavy elements of the order of 800 M ⊕ if embedded in a central core, requiring a revision either of the planet formation models or both planet evolution and structure models. We note however that smaller amounts of heavy elements are expected by more realistic models in which they are mixed throughout the envelope. The planet orbits a G-type star with an orbital period of 9.24 days and an eccentricity of 0.56.The star’s projected rotational velocity is v sini = 4.5 ± 1.0 km s-1 , corresponding to a spin period of 11.5 ± 3.1 days if its axis of rotation is perpendicular to the orbital plane. In the framework of Darwinian theories and neglecting stellar magnetic breaking, we calculate the tidal evolution of the system and show that CoRoT-20b is presently one of the very few Darwin-stable planets that is evolving toward a triple synchronous state with equality of the orbital, planetary and stellar spin periods.
66 citations
TL;DR: In this paper, the Geneva group has reported two Saturn-mass planets orbiting HD 83443 (K0V) with periods of 2.98 and 29.8 d, respectively.
Abstract: The Geneva group has reported two Saturn-mass planets orbiting HD 83443 (K0V) with periods of 2.98 and 29.8 d. The two planets have raised interest in their dynamics because of the possible 10:1 orbital resonance and the strong gravitational interactions. We report precise Doppler measurements of HD 83443 obtained with the Keck/HIRES and the AAT/UCLES spectrometers. These measurements strongly confirm the inner planet with period of 2.985 d, with orbital parameters in very good agreement with those of the Geneva group. However these Doppler measurements show no evidence of the outer planet, at thresholds of 1/4 (3 m/s) of the reported velocity amplitude of 13.8 m/s. Thus, the existence of the outer planet is in question. Indeed, the current Doppler measurements reveal no evidence of any second planet with periods less than a year.
63 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2019 | 4 |
| 2018 | 1 |
| 2017 | 6 |
| 2016 | 12 |
| 2015 | 6 |