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EXTRA-SOLAR PLANETS

EXTRA-SOLAR PLANETS. Dr. Z. E. Musielak Department of Physics University of Texas at Arlington. OUTLINE. Detection of Extra-Solar Planets Planets around Nearby Stars Stellar Habitable Zones Research at UTA Conclusions . The host star wobbles as a result of moving planet.

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EXTRA-SOLAR PLANETS

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  1. EXTRA-SOLAR PLANETS Dr. Z. E. Musielak Department of Physics University of Texas at Arlington

  2. OUTLINE • Detection of Extra-Solar Planets • Planets around Nearby Stars • Stellar Habitable Zones • Research at UTA • Conclusions

  3. The host star wobbles as a result of moving planet

  4. Doppler Detection Technique

  5. Planetary Transition

  6. Change in Stellar Brightness Due to Planet Transition

  7. Discoveries of Extrasolar Planets First planetary system was discovered by Wolszczan & Frail (1992) around a pulsar PSR 1257+12 First planets around solar-type stars were discovered by Mayor & Queloz (1995) Butler & Marcy (1996) Marcy & Butler (1996)

  8. McDonald Observatory

  9. Current Status As of today (February 20, 2008) Doppler technique – 260 planets Photometric technique – 35 planets Microlensing method – 6 planets Pulsar planets – 4 planets

  10. Orbits of Some Extrasolar Planets

  11. Observational Results • The discovered planets are more massive than Jupiter – giant planets! • Massive planets are located at small orbits. • Some giant planets have highly eccentric orbits.

  12. Stellar Habitable Zones

  13. Milky Way Habitable Zone

  14. RESEARCH AT UTA (1) Star – Planet Interactions (2) Orbital Stability in Habitable Zones (a) Single Stars (b) Binary Stars (c) Multiple Stellar Systems

  15. Stellar Activity and Exoplanets • Enhancement of stellar activity by exoplanets (e.g., Ca II H+K and X-rays) • Interaction between the stellar and planetary magnetic fields Cuntz, Saar & Musielak (2000) Orbital modulations of Ca II in 3 systems Hot spot following the planet in HD179949 Shkolnik, Walker & Bohlender (2003)

  16. OrbitalStability in Habitable Zone of51 Peg

  17. Orbital Stability in Habitable Zone of 47 UMa Noble, Musielak and Cuntz (2002)

  18. Orbital Stability in Habitable Zone of HD 210277 Noble, Musielak and Cuntz (2002)

  19. Orbital Stabilty in Binary Systems Musielak, Cuntz, Marshall and Stuit (2003)

  20. CONCLUSIONS • As of today, 276 extra-solar planets orbiting solar-type stars have been discovered. • The discovered planets have masses comparable to or larger than Jupiter and most of them orbit near their host stars. • Some of these giant planets have highly eccentric orbits.

  21. FUTURE OBSERVATIONS • The Keck Interferometer • Space Interferometry Mission (SIM) • Terrestrial Planet Finder (TPF) • The Kepler Photometer • The Darwin Mission • Gaia Space Observatory • The StarLight Mission

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