WFIRST Exoplanet Mass Measurement Method Finds a Planetary Mass of $39\pm 8 M_\oplus$ for OGLE-2012-BLG-0950Lb
| Autor: | J.-P. Beaulieu, Ian A. Bond, J. B. Marquette, Akihiko Fukui, Naoki Koshimoto, Jessica R. Lu, C. B. Henderson, Aparna Bhattacharya, Clément Ranc, Jonathan Anderson, P. Mróz, V. Batista, Andrzej Udalski, David P. Bennett, J. W. Blackman, Yuki Hirao |
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| Přispěvatelé: | Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), University of Notre Dame [Indiana] (UND), Centre Européen de Réalité Virtuelle (CERV), École Nationale d'Ingénieurs de Brest (ENIB), Vanda Pharmaceuticals, Institute of Natural and Mathematical Sciences, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (NAOJ), M2A 2018, Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) Brightness 010504 meteorology & atmospheric sciences Astronomy FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Planetary system Gravitational microlensing 01 natural sciences Accretion (astrophysics) Exoplanet [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] Stars Space and Planetary Science Planet 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Planetary mass Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal The Astrophysical Journal, American Astronomical Society, 2018, 156 (6), pp.289. ⟨10.3847/1538-3881/aaed46⟩ |
| ISSN: | 0004-637X 1538-4357 |
| DOI: | 10.3847/1538-3881/aaed46⟩ |
| Popis: | We present the analysis of the simultaneous high resolution images from the {\it Hubble Space Telescope} and Keck Adaptive Optics system of the planetary event OGLE-2012-BLG-0950 that determine that the system consists of a $0.58 \pm 0.04 \rm{M}_\odot$ host star orbited by a $39\pm 8 \rm{M}_\oplus$ planet of at projected separation of $2.54 \pm 0.23\,$AU. The planetary system is located at a distance of $2.19\pm 0.23$ kpc from Earth. This is the second microlens planet beyond the snow line with a mass measured to be in the mass range $20$--$80 \rm{M}_\oplus$. The runaway gas accretion process of the core accretion model predicts few planets in this mass range, because giant planets are thought to be growing rapidly at these masses and they rarely complete growth at this mass. So, this result suggests that the core accretion theory may need revision. This analysis also demonstrates the techniques that will be used to measure the masses of planets and their host stars by the WFIRST exoplanet microlensing survey: one-dimensional microlensing parallax combined with the separation and brightness measurement of the unresolved source and host stars to yield multiple redundant constraints on the masses and distance of the planetary system. 29 pages, 6 figures,Submitted to AJ |
| Databáze: | OpenAIRE |
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