دورية أكاديمية
Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE
| العنوان: | Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE |
|---|---|
| المؤلفون: | Samland, M., Molliere, P., Bonnefoy, M., Maire, A.L., Cantalloube, F., Cheetham, A.C., Mesa, D., Gratton, R., Biller, B.A., Wahhaj, Z., Bouwman, J., Brandner, W., Melnick, D., Carson, J., Janson, M., Henning, T., Homeier, D., Mordasini, C., Langlois, M., Quanz, S.P., Boekel, R., Van, Zurlo, A., Schlieder, J.E., Avenhaus, H., Beuzit, J.L., Boccaletti, A., Bonavita, M., Chauvin, G., Claudi, R., Cudel, M., Desidera, S., Feldt, M., Fusco, T., Galicher, R., Kopytova, T. G., Lagrange, A.M., Le Coroller, H., Martinez, P., Moeller‐nilsson, O., Mouillet, D., Mugnier, L.M., Perrot, C., Sevin, A., Sissa, E., Vigan, Arthur, Weber, L. |
| المساهمون: | Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, International Max Planck Research School for Astronomy and Cosmic Physics (University of Heidelberg), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ), DOTA, ONERA, Université Paris Saclay (COmUE) Châtillon, ONERA-Université Paris Saclay (COmUE), Observatoire Astronomique de l'Université de Genève (ObsGE), Université de Genève = University of Geneva (UNIGE), INAF - Osservatorio Astronomico di Padova (OAPD), Istituto Nazionale di Astrofisica (INAF), Institute for Astronomy Edinburgh (IfA), University of Edinburgh (Edin.), European Southern Observatory Santiago (ESO), European Southern Observatory (ESO), College of Charleston, Stockholm University, Universität Heidelberg Heidelberg = Heidelberg University, Universität Bern / University of Bern (UNIBE), Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich), Universidad de Santiago de Chile Santiago (USACH), Universidad Diego Portales Santiago - Chili (UDP), NASA Ames Research Center (ARC), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Arizona State University Tempe (ASU), Ural Federal University Ekaterinburg (UrFU), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS), ANR-14-CE33-0018,GIPSE,Exploration des planetes géantes extrasolaires(2014), ANR-10-LABX-0056,OSUG@2020,Innovative strategies for observing and modelling natural systems(2010) |
| المصدر: | ISSN: 0004-6361. |
| بيانات النشر: | HAL CCSD EDP Sciences |
| سنة النشر: | 2017 |
| المجموعة: | HAL Lyon 1 (University Claude Bernard Lyon 1) |
| مصطلحات موضوعية: | [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], [PHYS]Physics [physics], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| الوصف: | International audience ; Context. 51 Eridani b is an exoplanet around a young (20 Myr) nearby (29.4 pc) F0‐type star, which was recently discovered by direct imaging. It is one of the closest direct imaging planets in angular and physical separation (similar to 0.5 `', similar to 13 au) and is well suited for spectroscopic analysis using integral field spectrographs. Aims. We aim to refine the atmospheric properties of the known giant planet and to constrain the architecture of the system further by searching for additional companions. Methods. We used the extreme adaptive optics instrument SPHERE at the Very Large Telescope (VLT) to obtain simultaneous dual‐band imaging with IRDIS and integral field spectra with IFS, extending the spectral coverage of the planet to the complete Y‐to H‐band range and providing additional photometry in the K12‐bands (2.11, 2.25 mu m). The object is compared to other known cool and peculiar dwarfs. The posterior probability distributions for parameters of cloudy and clear atmospheric models are explored using MCMC. We verified our methods by determining atmospheric parameters for the two benchmark brown dwarfs Gl 570D and HD 3651B. We used archival VLT‐NACO (L') Sparse Aperture Masking data to probe the innermost region for additional companions. Results. We present the first spectrophotometric measurements in the Y and K bands for the planet and revise its J‐band flux to values 40% fainter than previous measurements. Cloudy models with uniform cloud coverage provide a good match to the data. We derive the temperature, radius, surface gravity, metallicity, and cloud sedimentation parameter f(sed). We find that the atmosphere is highly super‐solar ([Fe/H] = 1.0 +/‐ 0.1 dex), and the low f(sed) = 1.26(‐0.29)(+0.36) value is indicative of a vertically extended, optically thick cloud cover with small sized particles. The model radius and surface gravity estimates suggest higher planetary masses of M‐gravity = 9.1(‐3.3)(+4.9) M‐J. The evolutionary model only provides a lower mass limit ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | info:eu-repo/semantics/altIdentifier/arxiv/1704.02987; hal-01678389; https://hal.science/hal-01678389Test; ARXIV: 1704.02987 |
| DOI: | 10.1051/0004-6361/201629767 |
| الإتاحة: | https://doi.org/10.1051/0004-6361/201629767Test https://hal.science/hal-01678389Test |
| رقم الانضمام: | edsbas.6EF5008 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1051/0004-6361/201629767 |
|---|