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Your search keyword '"Joergen Christensen-Dalsgaard"' showing total 2 results
Start Over Author "Joergen Christensen-Dalsgaard" Journal science (new york, n.y.)
2 results on '"Joergen Christensen-Dalsgaard"'

1. Stellar spin-orbit misalignment in a multiplanet system

Author

Andrew W. Howard, Daniel Huber, William J. Chaplin, Mia S. Lundkvist, Sarbani Basu, Timothy R. Bedding, Geoffrey W. Marcy, Lars A. Buchhave, Yvonne Elsworth, Ronald L. Gilliland, Benjamin T. Montet, Eric B. Ford, David W. Latham, Victor Silva Aguirre, Mauro Barbieri, Tiago L. Campante, Andrea Miglio, John Asher Johnson, Torben Arentoft, Saskia Hekker, Hans Kjeldsen, Josefina Montalbán, Christoffer Karoff, Steven D. Kawaler, Joergen Christensen-Dalsgaard, Howard Isaacson, Dennis Stello, Daniel C. Fabrycky, Katherine M. Deck, Joshua N. Winn, Roberto Sanchis-Ojeda, Rasmus Handberg, Joshua A. Carter, Mikkel N. Lund, Travis S. Metcalfe, Low Energy Astrophysics (API, FNWI), Massachusetts Institute of Technology. Department of Physics, MIT Kavli Institute for Astrophysics and Space Research, Winn, Joshua Nathan, Sanchis Ojeda, Roberto, and Deck, Katherine M.

Subjects
Physics, Earth and Planetary Astrophysics (astro-ph.EP), Multidisciplinary, 010504 meteorology & atmospheric sciences, Red giant, Astronomy, FOS: Physical sciences, Astrophysics, Protoplanetary disk, 01 natural sciences, Asteroseismology, Radial velocity, Stars, Astrophysics - Solar and Stellar Astrophysics, Planet, 0103 physical sciences, Hot Jupiter, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics - Earth and Planetary Astrophysics, 0105 earth and related environmental sciences, Planetary migration
Abstract

Stars hosting hot Jupiters are often observed to have high obliquities, whereas stars with multiple coplanar planets have been seen to have low obliquities. This has been interpreted as evidence that hot-Jupiter formation is linked to dynamical disruption, as opposed to planet migration through a protoplanetary disk. We used asteroseismology to measure a large obliquity for Kepler-56, a red giant star hosting two transiting coplanar planets. These observations show that spin-orbit misalignments are not confined to hot-Jupiter systems. Misalignments in a broader class of systems had been predicted as a consequence of torques from wide-orbiting companions, and indeed radial velocity measurements revealed a third companion in a wide orbit in the Kepler-56 system., United States. National Aeronautics and Space Administration (Science Mission Directorate), United States. National Aeronautics and Space Administration (NASA Postdoctoral Program at Ames Research Center), National Science Foundation (U.S.) (NSF Graduate Research Fellowship), National Science Foundation (U.S.) (NSF Graduate Research Fellowship, grant DGE1144469), Netherlands Organization for Scientific Research, Belgian Federal Science Policy Office (BELSPO, contract PRODEX COROT), United States. National Aeronautics and Space Administration (NASA Kepler Participating Scientist program), National Science Foundation (U.S.) (NSF grant AST-1105930), David & Lucile Packard Foundation, Alfred P. Sloan Foundation, Harvard-Smithsonian Center for Astrophysics (Hubble Fellow)

Published
2013
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2. Differential Rotation and Dynamics of the Solar Interior

Author

Frank P. Pijpers, Deborah A. Haber, Jesper Schou, Joergen Christensen-Dalsgaard, D. Burtonclay, E. Anderson, Frank Hill, Philip B. Stark, Douglas Gough, Christopher R. Genovese, Takashi Sekii, H. M. Antia, R. Howe, J. W. Harvey, Janine Provost, Gabrielle Berthomieu, Edward J. Rhodes, Juri Toomre, P. R. Wilson, Marc L. DeRosa, John Leibacher, Thierry Corbard, Michael Thompson, Sylvain G. Korzennik, Alexander G. Kosovichev, S. M. Chitre, Joint Institute for Laboratory Astrophysics (JILA), National Institute of Standards and Technology [Gaithersburg] (NIST)-University of Colorado [Boulder], Laboratoire Giovanni Domenico Cassini, Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Haute-Provence (OHP), Institut Pythéas (OSU PYTHEAS), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut de Recherche pour le Développement (IRD), Stanford School of Medicine [Stanford], Stanford Medicine, Stanford University-Stanford University, Institute of Geophysics and Tectonics, School of Earth and Environment, University of Leeds, National Solar Observatory [Tucson] (NSO/Tucson), National Science Foundation [Arlington] (NSF)-Association of Universities for Research in Astronomy (AURA), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Research School of Earth Sciences [Canberra] (RSES), Australian National University (ANU), Hansen Experimental Physics Lab [Stanford] (HEPL), Stanford University, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES)

Subjects
Physics, Multidisciplinary, 010504 meteorology & atmospheric sciences, business.industry, Oscillation, Geometry, Radius, Rotation, [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], 01 natural sciences, Latitude, Optics, Convection zone, 0103 physical sciences, Physics::Space Physics, Differential rotation, Solar rotation, Astrophysics::Solar and Stellar Astrophysics, Helioseismology, Astrophysics::Earth and Planetary Astrophysics, business, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences
Abstract

Splitting of the sun's global oscillation frequencies by large-scale flows can be used to investigate how rotation varies with radius and latitude within the solar interior. The nearly uninterrupted observations by the Global Oscillation Network Group (GONG) yield oscillation power spectra with high duty cycles and high signal-to-noise ratios. Frequency splittings derived from GONG observations confirm that the variation of rotation rate with latitude seen at the surface carries through much of the convection zone, at the base of which is an adjustment layer leading to latitudinally independent rotation at greater depths. A distinctive shear layer just below the surface is discernible at low to mid-latitudes.

Published
1996
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