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A Planetary Companion to γ Cephei A

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© 2003. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, ,

0004-637X/599/2/1383

Abstract

We report on the detection of a planetary companion in orbit around the primary star of the binary system γ Cephei. High-precision radial velocity measurements using four independent data sets spanning the time interval 1981-2002 reveal long-lived residual radial velocity variations superposed on the binary orbit that are coherent in phase and amplitude with a period or 2.48 yr (906 days) and a semiamplitude of 27.5 m s-1. We performed a careful analysis of our Ca II H and K S-index measurements, spectral line bisectors, and Hipparcos photometry. We found no significant variations in these quantities with the 906 day period. We also reanalyzed the Ca II λ8662 measurements of Walker et al., which showed possible periodic variations with the "planet" period when first published. This analysis shows that periodic Ca II equivalent width variations were only present during 1986.5-1992 and absent during 1981-1986.5. Furthermore, a refined period for the Ca II λ8662 variations is 2.14 yr, significantly less than the residual radial velocity period. The most likely explanation of the residual radial velocity variations is a planetary-mass companion with M sin i = 1.7MJ and an orbital semimajor axis of a2 = 2.13 AU. This supports the planet hypothesis for the residual radial velocity variations for γ Cep first suggested by Walker et al. With an estimated binary orbital period of 57 yr, γ Cep is the shortest period binary system in which an extrasolar planet has been found. This system may provide insights into the relationship between planetary and binary star formation.

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References

  • Baliunas, S. L., et al. 1995, ApJ, 438, 269

    CrossrefADS

  • Bohlender, D. A., Irwin, A. W., Yang, S. L. S., & Walker, G. A. H. 1992, PASP, 104, 1152

    IOPscienceADS

  • Brown, T. M., Kotak, R., Horner, S. D., Kennelly, E. J., Korzennik, S., Nisenson, P., & Noyes, R. W. 1998, ApJS, 117, 563

    IOPscienceADS

  • Butler, R. P., Marcy, G. W., Fischer, D. A., Brown, T. M., Contos, A. R., Korzennik, S. G., Nisenson, P., & Noyes, R. W. 1999, ApJ, 526, 916

    IOPscienceADS

  • Butler, R. P., Marcy, G. W., Williams, E., McCarthy, C., Dosanjh, P., & Vogt, S. S. 1996, PASP, 108, 500

    IOPscienceADS

  • Butler, R. P., Tinney, C. G., Marcy, G. W., Jones, H. R. A., Penny, A. J., & Apps, K. 2001, ApJ, 555, 410

    IOPscienceADS

  • Butler, R. P., et al. 2002, ApJ, 578, 565

    IOPscienceADS

  • Campbell, B., & Walker, G. A. H. 1979, PASP, 91, 540

    IOPscienceADS

  • Campbell, B., Walker, G. A. H., & Yang, S. 1988, ApJ, 331, 902

    CrossrefADS

  • Cochran, W. D., & Hatzes, A. P. 2003, in IAU Symp. 202, Planetary Systems in the Universe: Observation, Formation, and Evolution, ed. A. J. Penny, P. Artymowicz, A.-M. Lagrange, & S. S. Russell (San Francisco: ASP), in press
  • Duncan, D. K., et al. 1991, ApJS, 76, 383

    CrossrefADS

  • Dvorak, R., Pilat-Lohinger, E., Funk, B., & Freistetter, F. 2003, A&A, 398, L1

    CrossrefADS

  • Endl, M., Kürster, M., & Els, S. 2000, A&A, 362, 585

    ADS

  • Frink, S., Mitchell, D. S., Quirenback, A., Fischer, D. A., Marcy, G. W., & Butler, R. P. 2002, ApJ, 576, 478

    IOPscienceADS

  • Fuhrmann, K. 2003, Astron. Nachr., in press
  • Griffin, R., & Griffin, R. 1973, MNRAS, 162, 243

    CrossrefADS

  • Griffin, R. F., Carquillat, J.-M., & Ginestet, N. 2002, Observatory, 122, 90

    ADS

  • Hatzes, A. P. 1996, PASP, 108, 839

    IOPscienceADS

  • Hatzes, A. P. 2002, Astron. Nachr., 323, 392

    CrossrefADS

  • Hatzes, A. P., & Cochran, W. D. 1993, ApJ, 413, 339

    CrossrefADS

  • Hatzes, A. P., Cochran, W. D., & Bakker, E. J. 1998a, Nature, 391, 154

    CrossrefADS

  • Hatzes, A. P., Cochran, W. D., & Bakker, E. J. 1998b, ApJ, 508, 380

    IOPscienceADS

  • Hatzes, A.. P., Cochran, W. D., & Johns-Krull, C. M. 1997, ApJ, 478, 374

    IOPscienceADS

  • Jefferys, W., Fitzpatrick, J., & McArthur, B. 1988, Celest. Mech., 41, 39

    CrossrefADS

  • Koch, A., & Wohl, H. 1984, A&A, 134, 134

    ADS

  • Kürster, M., Schmitt, J. H. M. M., Cutispoto, G., & Dennerl, K. 1997, A&A, 320, 831

    ADS

  • Libbrecht, K. G. 1988, ApJ, 330, L51

    CrossrefADS

  • Lomb, N. R. 1976, Ap&SS, 39, 447

    CrossrefADS

  • McArthur, B., Jefferys, W., & McCartney, J. 1994, BAAS, 26, 900

    ADS

  • Murdoch, K. A., Hearnshaw, J. B., & Clark, M. 1993, ApJ, 413, 349

    CrossrefADS

  • Paulson, D. B., Saar, S. H., Cochran, W. D., & Hatzes, A. P. 2002, AJ, 124, 572

    IOPscienceADS

  • Perryman, M. A. C., et al. 1997, A&A, 323, L49

    ADS

  • Queloz, D., et al. 2001, A&A, 379, 279

    CrossrefADS

  • Saar, S. H., & Donahue, R. A. 1997, ApJ, 485, 319

    IOPscienceADS

  • Saar, S. H., & Fischer, D. 2000, ApJ, 534, L105

    IOPscienceADS

  • Scargle, J. D. 1982, ApJ, 263, 835

    CrossrefADS

  • Setiawan, J., et al. 2003, A&A, 398, L19

    CrossrefADS

  • Soderblom, D. R., Duncan, D. K, & Johnson, D. R. H. 1991, ApJ, 375, 722

    CrossrefADS

  • Tull, R. G., MacQueen, P. J., Sneden, C., & Lambert, D. L. 1995, PASP, 107, 251

    IOPscienceADS

  • Valenti, J. A., Butler, R. P., & Marcy, G. W. 1995, PASP, 107, 966

    IOPscienceADS

  • Walker, G. A. H., Bohlender, D. A., Walker, A. R., Irwin, A. W., Yang, S. L. S., & Larson, A. 1992, ApJ, 396, L91

    CrossrefADS

  • Walker, G. A. H., Yang, S., Campbell, B., & Irwin, A. W. 1989, ApJ, 343, L21

    CrossrefADS

  • Walker, G. A. H., Walker, A. R., Irwin, A. W., Larson, A. M., Yang, S. L. S., & Richardson, D. C. 1995, Icarus, 116, 359

    CrossrefADS

Export references: BibTeX RIS

Citations

  1. Dynamical Analysis of the Circumprimary Planet in the Eccentric Binary System HD 59686
    Trifon Trifonov et al. 2018 The Astronomical Journal 155 174

    IOPscience

  2. Secular Evolution Driven by Massive Eccentric Disks/Rings: An Apsidally Aligned Case
    Irina Davydenkova and Roman R. Rafikov 2018 The Astrophysical Journal 864 74

    IOPscience

  3. Planet Formation in Highly Inclined Binary Systems. II. Orbital Alignment and Planet Growth Boost in Intermediate Separation Binaries
    Yapeng Zhang et al. 2018 The Astrophysical Journal 861 116

    IOPscience

  4. Sulfur Hazes in Giant Exoplanet Atmospheres: Impacts on Reflected Light Spectra
    Peter Gao et al. 2017 The Astronomical Journal 153 139

    IOPscience

  5. Near-infrared Imaging Polarimetry of Inner Region of GG Tau A Disk
    Yi Yang et al. 2017 The Astronomical Journal 153 7

    IOPscience

  6. The Impact of Stellar Multiplicity on Planetary Systems. I. The Ruinous Influence of Close Binary Companions
    Adam L. Kraus et al. 2016 The Astronomical Journal 152 8

    IOPscience

  7. Long-period Variations in the Radial Velocity of Spectroscopic Binary M Giant μ Ursae Majoris
    Byeong-Cheol Lee et al. 2016 The Astronomical Journal 151 106

    IOPscience

  8. Self-destructing Spiral Waves: Global Simulations of a Spiral-wave Instability in Accretion Disks
    Jaehan Bae et al. 2016 The Astrophysical Journal 829 13

    IOPscience

  9. A 12-year Activity Cycle for the Nearby Planet Host Star HD 219134
    Marshall C. Johnson et al. 2016 The Astrophysical Journal 821 74

    IOPscience

  10. Two New Long-period Giant Planets from the McDonald Observatory Planet Search and Two Stars with Long-period Radial Velocity Signals Related to Stellar Activity Cycles
    Michael Endl et al. 2016 The Astrophysical Journal 818 34

    IOPscience

  11. Orbital Architectures of Planet-hosting Binaries. I. Forming Five Small Planets in the Truncated Disk of Kepler-444A
    Trent J. Dupuy et al. 2016 The Astrophysical Journal 817 80

    IOPscience

  12. Three Red Giants With Substellar-Mass Companions
    A. Niedzielski et al. 2015 The Astrophysical Journal 803 1

    IOPscience

  13. On the Likelihood of Planet Formation in Close Binaries
    Hannah Jang-Condell 2015 The Astrophysical Journal 799 147

    IOPscience

  14. Planet Formation in Stellar Binaries. II. Overcoming the Fragmentation Barrier in α Centauri and γ Cephei-like Systems
    Roman R. Rafikov and Kedron Silsbee 2015 The Astrophysical Journal 798 70

    IOPscience

  15. Planet Formation in Stellar Binaries. I. Planetesimal Dynamics in Massive Protoplanetary Disks
    Roman R. Rafikov and Kedron Silsbee 2015 The Astrophysical Journal 798 69

    IOPscience

  16. The Twenty-five Year Lick Planet Search
    Debra A. Fischer et al. 2014 The Astrophysical Journal Supplement Series 210 5

    IOPscience

  17. The Physical Parameters of the Retired a Star HD 185351
    John Asher Johnson et al. 2014 The Astrophysical Journal 794 15

    IOPscience

  18. Calculating the Habitable Zone of Binary Star Systems. I. S-type Binaries
    Lisa Kaltenegger and Nader Haghighipour 2013 The Astrophysical Journal 777 165

    IOPscience

  19. Evidence for the Tidal Destruction of Hot Jupiters by Subgiant Stars
    Kevin C. Schlaufman and Joshua N. Winn 2013 The Astrophysical Journal 772 143

    IOPscience

  20. Retired A Stars: The Effect of Stellar Evolution on the Mass Estimates of Subgiants
    John Asher Johnson et al. 2013 The Astrophysical Journal 763 53

    IOPscience

  21. How Not to Build Tatooine: The Difficulty of In Situ Formation of Circumbinary Planets Kepler 16b, Kepler 34b, and Kepler 35b
    Sijme-Jan Paardekooper et al. 2012 The Astrophysical Journal Letters 754 L16

    IOPscience

  22. Forming different planetary systems
    Ji-Lin Zhou et al 2012 Research in Astronomy and Astrophysics 12 1081

    IOPscience

  23. An Analytic Method to Determine Habitable Zones for S-Type Planetary Orbits in Binary Star Systems
    Siegfried Eggl et al. 2012 The Astrophysical Journal 752 74

    IOPscience

  24. Planetesimal Dynamics in Inclined Binary Systems: The Role of Gas-Disk Gravity
    Gang Zhao et al. 2012 The Astrophysical Journal 749 172

    IOPscience

  25. The Role of Multiplicity in Disk Evolution and Planet Formation
    Adam L. Kraus et al. 2012 The Astrophysical Journal 745 19

    IOPscience

  26. Retired A Stars and Their Companions. VII. 18 New Jovian Planets
    John Asher Johnson et al. 2011 The Astrophysical Journal Supplement Series 197 26

    IOPscience

  27. The Mass of CoRoT-7b
    Artie P. Hatzes et al. 2011 The Astrophysical Journal 743 75

    IOPscience

  28. Planet Formation in Highly Inclined Binary Systems. I. Planetesimals Jump Inward and Pile Up
    Ji-Wei Xie et al. 2011 The Astrophysical Journal 735 10

    IOPscience

  29. Planet formation – implication of statistical properties of exoplanets
    Áron Süli 2010 Journal of Physics: Conference Series 218 012004

    IOPscience

  30. The Phases Differential Astrometry Data Archive. V. Candidate Substellar Companions to Binary Systems
    Matthew W. Muterspaugh et al. 2010 The Astronomical Journal 140 1657

    IOPscience

  31. The Phases Differential Astrometry Data Archive. III. Limits to Tertiary Companions
    Matthew W. Muterspaugh et al. 2010 The Astronomical Journal 140 1631

    IOPscience

  32. Ruling Out Possible Secondary Stars to Exoplanet Host Stars Using the CHARA Array
    Ellyn K. Baines et al. 2010 The Astronomical Journal 140 167

    IOPscience

  33. Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
    John Asher Johnson et al. 2010 Publications of the Astronomical Society of the Pacific 122 905

    IOPscience

  34. Retired A Stars and Their Companions. IV. Seven Jovian Exoplanets from Keck Observatory
    John Asher Johnson et al. 2010 Publications of the Astronomical Society of the Pacific 122 701

    IOPscience

  35. On-sky Demonstration of a Linear Band-limited Mask with Application to Visual Binary Stars
    J. Crepp et al. 2010 The Astrophysical Journal 715 1533

    IOPscience

  36. Retired a Stars and Their Companions. III. Comparing the Mass–Period Distributions of Planets Around A-Type Stars and Sun-Like Stars
    Brendan P. Bowler et al. 2010 The Astrophysical Journal 709 396

    IOPscience

  37. Planetesimal Accretion in Binary Systems: Could Planets Form Around α Centauri B?
    Ji-Wei Xie et al. 2010 The Astrophysical Journal 708 1566

    IOPscience

  38. The Orbital Evolution of Gas Giant Planets Around Giant Stars
    Eva Villaver and Mario Livio 2009 The Astrophysical Journal Letters 705 L81

    IOPscience

  39. Planetesimal Accretion in Binary Systems: Role of the Companion's Orbital Inclination
    Ji-Wei Xie and Ji-Lin Zhou 2009 The Astrophysical Journal 698 2066

    IOPscience

  40. Dynamics of Planetary Systems in Star Clusters
    R. Spurzem et al. 2009 The Astrophysical Journal 697 458

    IOPscience

  41. Nondetection of Polarized, Scattered Light from the HD 189733b Hot Jupiter
    Sloane J. Wiktorowicz 2009 The Astrophysical Journal 696 1116

    IOPscience

  42. Stellar Mass Dependent Disk Dispersal
    Grant M. Kennedy and Scott J. Kenyon 2009 The Astrophysical Journal 695 1210

    IOPscience

  43. The Stability and Dynamics of Planets in Tight Binary Systems
    Lamya A. Saleh and Frederic A. Rasio 2009 The Astrophysical Journal 694 1566

    IOPscience

  44. Disk Truncation and Planet Formation in γ Cephei
    H. Jang-Condell et al. 2008 The Astrophysical Journal Letters 683 L191

    IOPscience

  45. Extrasolar planets around intermediate mass stars
    A P Hatzes 2008 Physica Scripta 2008 014004

    IOPscience

  46. Planetesimal Accretion in Binary Systems: The Effects of Gas Dissipation
    Ji-Wei Xie and Ji-Lin Zhou 2008 The Astrophysical Journal 686 570

    IOPscience

  47. A Planetary-Mass Companion to the K0 Giant HD 17092
    A. Niedzielski et al. 2007 The Astrophysical Journal 669 1354

    IOPscience

  48. Formation of Protoplanets from Massive Planetesimals in Binary Systems
    Yusuke Tsukamoto and Junichiro Makino 2007 The Astrophysical Journal 669 1316

    IOPscience

  49. Habitable Planet Formation in Binary Planetary Systems
    Nader Haghighipour and Sean N. Raymond 2007 The Astrophysical Journal 666 436

    IOPscience

  50. Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants
    John Asher Johnson et al. 2007 The Astrophysical Journal 665 785

    IOPscience

  51. Terrestrial Planet Formation around Individual Stars within Binary Star Systems
    Elisa V. Quintana et al. 2007 The Astrophysical Journal 660 807

    IOPscience

  52. The Planet Host Star γ Cephei: Physical Properties, the Binary Orbit, and the Mass of the Substellar Companion
    Guillermo Torres 2007 The Astrophysical Journal 654 1095

    IOPscience

  53. Detection Limits from the McDonald Observatory Planet Search Program
    Robert A. Wittenmyer et al. 2006 The Astronomical Journal 132 177

    IOPscience

  54. Determination of the Orbit of the Planetary Companion to the Metal-Rich Star HD 45350
    Michael Endl et al. 2006 The Astronomical Journal 131 3131

    IOPscience

  55. Limits to Tertiary Astrometric Companions in Binary Systems
    Matthew W. Muterspaugh et al. 2006 The Astrophysical Journal 653 1469

    IOPscience

  56. Impact of Stellar Dynamics on the Frequency of Giant Planets in Close Binaries
    Eric Pfahl and Matthew Muterspaugh 2006 The Astrophysical Journal 652 1694

    IOPscience

  57. Exploring the Frequency of Close-in Jovian Planets around M Dwarfs
    Michael Endl et al. 2006 The Astrophysical Journal 649 436

    IOPscience

  58. Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems
    Deepak Raghavan et al. 2006 The Astrophysical Journal 646 523

    IOPscience

  59. Catalog of Nearby Exoplanets
    R. P. Butler et al. 2006 The Astrophysical Journal 646 505

    IOPscience

  60. Dynamical Stability and Habitability of the γ Cephei Binary-Planetary System
    Nader Haghighipour 2006 The Astrophysical Journal 644 543

    IOPscience

  61. Gas Giant Protoplanets Formed by Disk Instability in Binary Star Systems
    A. P. Boss 2006 The Astrophysical Journal 641 1148

    IOPscience

  62. Cluster Origin of the Triple Star HD 188753 and Its Planet
    Eric Pfahl 2005 The Astrophysical Journal Letters 635 L89

    IOPscience

  63. Jumping Jupiters in Binary Star Systems
    F. Marzari et al. 2005 The Astrophysical Journal 618 502

    IOPscience

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