[en] Rotation is expected to have an important influence on the structure and the evolution of stars. However, the mechanisms of angular momentum transport in stars remain theoretically uncertain and very complex to take into account in stellar models. To achieve a better understanding of these processes, we desperately need observational constraints on the internal rotation of stars, which until very recently was restricted to the Sun. In this paper, we report the detection of mixed modes—i.e., modes that behave both as g modes in the core and as p modes in the envelope—in the spectrum of the early red giant KIC 7341231, which was observed during one year with the Kepler spacecraft. By performing an analysis of the oscillation spectrum of the star, we show that its non-radial modes are clearly split by stellar rotation and we are able to determine precisely the rotational splittings of 18 modes. We then find a stellar model that reproduces very well the observed atmospheric and seismic properties of the star. We use this model to perform inversions of the internal rotation profile of the star, which enables us to show that the core of the star is rotating at least five times faster than the envelope. This will shed new light on the processes of transport of angular momentum in stars. In particular, this result can be used to place constraints on the angular momentum coupling between the core and the envelope of early red giants, which could help us discriminate between the theories that have been proposed over the last few decades.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Deheuvels, S.; Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA ; LESIA, UMR8109, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, CNRS, 5 Place Jules Janssen, F-92195 Meudon Cedex, France ; Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA
García, R. A.; Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA ; Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, CEA, IRFU, SAp, centre de Saclay, F-91191 Gif-sur-Yvette, France
Chaplin, W. J.; Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA ; School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
Basu, S.; Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA
Antia, H. M.; Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India
Appourchaux, T.; Institut d'Astrophysique Spatiale, UMR8617, Université Paris XI, Bâtiment 121, F-91405 Orsay Cedex, France
Benomar, O.; Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
Davies, G. R.; Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, CEA, IRFU, SAp, centre de Saclay, F-91191 Gif-sur-Yvette, France
Elsworth, Y.; School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
Gizon, L.; Institut für Astrophysik, Georg-August-Universität Göttingen, D-37077 Göttingen, Germany ; Max-Planck-Institut für Sonnensystemforschung, D-37191 Katlenburg-Lindau, Germany
Goupil, M. J.; LESIA, UMR8109, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, CNRS, 5 Place Jules Janssen, F-92195 Meudon Cedex, France
Reese, Daniel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Regulo, C.; Instituto de Astrofsica de Canarias, E-38205 La Laguna, Tenerife, Spain ; Dpto de Astrofsica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
Schou, J.; W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305-4085, USA
Stahn, T.; Institut für Astrophysik, Georg-August-Universität Göttingen, D-37077 Göttingen, Germany
Casagrande, L.; Research School of Astronomy & Astrophysics, Mount Stromlo Observatory, The Australian National University, ACT 2611, Australia
Christensen-Dalsgaard, J.; Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Fischer, D.; Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA
Hekker, S.; Astronomical Institute "Anton Pannekoek," University of Amsterdam, Science Park 904, 1098 HX Amsterdam, The Netherlands
Kjeldsen, H.; Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Mathur, S.; High Altitude Observatory, NCAR, P.O. Box 3000, Boulder, CO 80307, USA
Mosser, B.; LESIA, UMR8109, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, CNRS, 5 Place Jules Janssen, F-92195 Meudon Cedex, France
Pinsonneault, M.; Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA ; Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA
Valenti, J.; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Christiansen, J. L.; SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
Kinemuchi, K.; Bay Area Environmental Research Inst./NASA Ames Research Center, Moffett Field, CA 94035, USA
Mullally, F.; SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA)
Aerts, C., Christensen-Dalsgaard, J., & Kurtz, D. W. 2010, Asteroseismology (Berlin: Springer)
Aizenman, M., Smeyers, P., & Weigert, A. 1977, A&A, 58, 41
Ammons, S. M., Robinson, S. E., & Strader, J. et al. 2006, ApJ, 638, 1004 (Pubitemid 43342475)
Anderson, E. R., Duvall, T. L., Jr., & Jefferies, S. M. 1990, ApJ, 364, 699
Angulo, C., Arnould, M., & Rayet, M. et al. 1999, Nucl. Phys. A, 656, 3
Appourchaux, T., Berthomieu, G., & Michel, E. et al. 2006, The CoRoT Mission: Pre-launch Status (ESP-1306), ed. M. Fridlund, A. Baglin, J. Lochard, & L. Conroy (Noordwijk: ESA), 377
Appourchaux, T., Michel, E., & Auvergne, M. et al. 2008, A&A, 488, 705
Backus, G. & Gilbert, F. 1968, Geophys. J. Int., 16, 169
Baglin, A., Auvergne, M., & Boisnard, L. et al. 2006, 36th COSPAR Scientific Assembly Plenary Meeting, Vol. 36, meeting abstract from CD-ROM, 3749
Ballot, J., Gizon, L., & Samadi, R. et al. 2011, A&A, 530, A97
Basu, S., Grundahl, F., & Stello, D. et al. 2011, ApJ, 729, L10
Beck, P. G., Bedding, T. R., & Mosser, B. et al. 2011, Science, 332, 205
Beck, P. G., Montalban, J., & Kallinger, T. et al. 2012, Nature, 481, 55
Bedding, T. R. 2012, Canary Islands Winter School of Astrophysics, Vol. XXII, Asteroseismology, ed. P. L. Pallé (Cambridge: Cambridge Univ. Press), in press (arXiv:1107.1723)
Bedding, T. R., Mosser, B., & Huber, D. et al. 2011, Nature, 471, 608
Behr, B. B. 2003, ApJS, 149, 101 (Pubitemid 37534550)
Benomar, O., Bedding, T. R., & Stello, D. et al. 2012, ApJ, 745, L33
Bodenheimer, P. 1995, ARA&A, 33, 199
Borucki, W. J., Koch, D., & Basri, G. et al. 2010, Science, 327, 977
Bouvier, J. 2008, A&A, 489, L53
Brown, T. M., Gilliland, R. L., Noyes, R. W., & Ramsey, L. W. 1991, ApJ, 368, 599
Campante, T. L., Handberg, R., & Mathur, S. et al. 2011, A&A, 534, A6
Canuto, V. M., Goldman, I., & Mazzitelli, I. 1996, ApJ, 473, 550 (Pubitemid 127002290)
Casagrande, L., Ramírez, I., Meléndez, J., Bessell, M., & Asplund, M. 2010, A&A, 512, A54
Casagrande, L., Schönrich, R., & Asplund, M. et al. 2011, A&A, 530, A138
Cayrel de Strobel, G., Soubiran, C., & Ralite, N. 2001, A&A, 373, 159
Chaplin, W. J., Appourchaux, T., & Elsworth, Y. et al. 2010, ApJ, 713, L169
Chaplin, W. J., Christensen-Dalsgaard, J., & Elsworth, Y. et al. 1999, MNRAS, 308, 405
Chaplin, W. J., Kjeldsen, H., & Christensen-Dalsgaard, J. et al. 2011, Science, 332, 213
Charbonnel, C. & Talon, S. 2005, Science, 309, 2189 (Pubitemid 41396063)
Christensen-Dalsgaard, J., Schou, J., & Thompson, M. J. 1990, MNRAS, 242, 353
Christensen-Dalsgaard, J. & Thompson, M. J. 1997, MNRAS, 284, 527
Cowling, T. G. & Newing, R. A. 1949, ApJ, 109, 149
Deheuvels, S., Bruntt, H., & Michel, E. et al. 2010, A&A, 515, A87
Deheuvels, S. & Michel, E. 2010a, Astron. Nachr., 331, 929
Deheuvels, S. & Michel, E. 2010b, Ap&SS, 328, 259
Deheuvels, S. & Michel, E. 2011, A&A, 535, A91
Dupret, M.-A., Belkacem, K., & Samadi, R. et al. 2009, A&A, 506, 57
Duvall, T. L., Jr. & Harvey, J. W. 1986, NATO ASIC Proc. 169: Seismology of the Sun and the Distant Stars, ed. D. O. Gough (Dordrecht: Reidel), 105
Dziembowski, W. A., Gough, D. O., Houdek, G., & Sienkiewicz, R. 2001, MNRAS, 328, 601 (Pubitemid 33625082)
Eddington, A. S., ed. 1926, The Internal Constitution of the Stars (Cambridge: Cambridge Univ. Press)
Fletcher, S. T., Chaplin, W. J., Elsworth, Y., Schou, J., & Buzasi, D. 2006, MNRAS, 371, 935 (Pubitemid 44385391)
García, R. A., Hekker, S., & Stello, D. et al. 2011, MNRAS, 414, L6
García, R. A., Régulo, C., & Samadi, R. et al. 2009, A&A, 506, 41
Gilliland, R. L., Brown, T. M., & Christensen-Dalsgaard, J. et al. 2010, PASP, 122, 131
Gizon, L. & Solanki, S. K. 2003, ApJ, 589, 1009 (Pubitemid 37095244)
Gough, D. O. & McIntyre, M. E. 1998, Nature, 394, 755 (Pubitemid 28391633)
Goupil, M.-j. 2011, arXiv:1102.1884
Grevesse, N. & Noels, A. 1993, Origin and Evolution of the Elements, ed. N. Prantzos, E. Vangioni-Flam, & M. Casse (New York: Cambridge Univ. Press), 15
Gruberbauer, M., Guenther, D. B., & Kallinger, T. 2012, ApJ, 749, 109
Harvey, J. 1985, Future Missions in Solar, Heliospheric and Space Plasma Physics (ESA SP-235), ed. E. Rolfe & B. Battrick (Noordwijk: ESA Publications Division), 199
Hekker, S., Kallinger, T., & Baudin, F. et al. 2009, A&A, 506, 465
Hog, E., Fabricius, C., & Makarov, V. V. et al. 2000, A&A, 355, L27
Huber, D., Bedding, T. R., & Stello, D. et al. 2011, ApJ, 743, 143
Irwin, J., Hodgkin, S., & Aigrain, S. et al. 2007, MNRAS, 377, 741
Jenkins, J. M., Caldwell, D. A., & Chandrasekaran, H. et al. 2010, ApJ, 713, L120
Kallinger, T., Mosser, B., & Hekker, S. et al. 2010, A&A, 522, A1
Kawaler, S. D., Sekii, T., & Gough, D. 1999, ApJ, 516, 349
Keppens, R., MacGregor, K. B., & Charbonneau, P. 1995, A&A, 294, 469
Kjeldsen, H. & Bedding, T. R. 1995, A&A, 293, 87
Kjeldsen, H., Bedding, T. R., & Christensen-Dalsgaard, J. 2008, ApJ, 683, L175
Kjeldsen, H., Bedding, T. R., Viskum, M., & Frandsen, S. 1995, AJ, 109, 1313
Laird, J. B., Carney, B. W., & Latham, D. W. 1988, AJ, 95, 1843
Latham, D. W., Stefanik, R. P., & Torres, G. et al. 2002, AJ, 124, 1144 (Pubitemid 37001967)
Lebreton, Y., Monteiro, M. J. P. F. G., & Montalbán, J. et al. 2008, Ap&SS, 316, 1
