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HR 8799 (HD 218396)

HR 8799 (HD 218396). Observations with MOST + ground based multi-site campaign. André-Nicolas Chené (NRC/HIA/CGO) ~35 co-authors…. Collaborators. Belgium Peter De Cat (RBO) Duncan J. Wright (RBO) Connie Aerts (Leuven) Tijl Verhost (Leuven) Paul Beck (Leuven) Steven Bleomen (Leuven)

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HR 8799 (HD 218396)

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  1. HR 8799 (HD 218396) Observations with MOST + ground based multi-site campaign André-Nicolas Chené (NRC/HIA/CGO) ~35 co-authors…

  2. Collaborators • Belgium • Peter De Cat (RBO) • Duncan J. Wright (RBO) • Connie Aerts (Leuven) • Tijl Verhost (Leuven) • Paul Beck (Leuven) • Steven Bleomen (Leuven) • Josefa Montalban (Liège) • Mehdi-Pierre Bouadib (Liège) • Andrea Miglio (Liège) • Marc-Antoine Dupret (Liège) • Japan • Eiji Kambe (OAO) • France • Philippe Mathias (OCA) • MOST team • Canada • Gordon Walker (UBC) • André-Nicolas Chené (HIA) • Christian Marois (HIA) • David Bohlender (HIA) • Stephenson L. S. Yang (UVic) • Germany • Artie P. Hatzes (Tautenburg) • Michael Hartmann (Tautenburg) • Holger Lehmann (Tautenburg) • Chile • Christian Nitschelm (Antofagasta) • U.S.A. • Bruce Macintosh (LLNL) • Josh Isaacs (LLNL) • Carl Melis (U Cal.) • Jason Rowe (AMES)

  3. Fit of the Orbit Best fit (Konopacky et al. in prep) Stable orbit

  4. Spectra of the planets NIRC2 image showing OSIRIS FOV 1 x 20 min. raw cube 1 x 20 min. cube after speckle removal

  5. c d b The System’s Age • Age determined: • Galactic space motion • Color-magnitude diag. • BUT: • Single field-star •  Bootis (Marois et al. 2008)

  6. The System’s Age • HR 8799 is a -Dor variable (has g-modes (and p-modes ???)) • In-depth asteroseismologic modeling of the host star will be used to derive an independent age of the system.

  7. f1 = 1.9791 d-1 f2 = 1.7268 d-1 f3 = 1.6498 d-1 f4 = 0.2479 d-1 Photometry of HR 8799 Associated with g-modes b) • Zerbi et al. (1999) • a) Window function • b) folded light- curves Not a final solution a)

  8. HR 8799 with MOST • Confirmed 3 first freq. published by Zerbi (1999) • + 38 other freq.

  9. HR 8799 with MOST • Granulation? « Nah… » - Jason Rowe

  10. Spectroscopy of HR 8799 • Full mode determination is impossible with broad-band photometry only (sensitive to small values of l) • The determination of both l and m requires high resolution, high signal-to-noise spectroscopic monitoring

  11. 181.24 185.26 185.27 185.29 187.25 397.59 399.64 401.56 402.64 403.53 404.54 406.56 407.51 410.52 435.40 436.41 441.43 448.45 449.57 470.44 522.35 524.29 525.25 530.31 531.28 HJD 2449957 + Spectroscopy of HR 8799 • Mathias et al. (2004) • Zerbi et al. (1999) a) b)

  12. DAO (CND) OHP (Fr) OAO (JPN) Taut (D) Lick (USA) Mercator (Es) Multi-Site Campaign + many others with ROB! (e. g. Xinglong, BAO, La Silla, …)

  13. Multi-Site Campaign • Continuous monitoring - 2 weeks • Time span over ~2 years!!! • R=50-60 000 on ~4000-8000 Å

  14. Multi-Site Campaign • 15-day sample of contig. obs. (OAO, Lick, Taut., DAO)

  15. Multi-Site Campaign • Using only ~900 spectra obtained last September (many more spectra to come)

  16. The model(s) • Nothing that I can present yet… • Two teams are working on it.

  17. The model(s) • Fairly well studied • Inclination must be small (<20˚)

  18. The model(s) • Shows X-ray variations!!! • Due to stellar spots? (Robrade & Schmitt 2010)

  19. The models • Moya (s) et al. 2010:

  20. Moya (s) et al. 2010 What they prefer At the limit

  21. Chené et al. 2010… Stay tuned!

  22. The END Thank you very much André-Nicolas Chené (NRC/HIA/CGO) ~35 co-authors…

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