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Spectroscopic Orbits Of Kepler's Gas Giants KOI-254: A Case Study

Spectroscopic Orbits Of Kepler's Gas Giants KOI-254: A Case Study. John A. Johnson Sebastian Pineda Michael Bottom Zach Gazak Josh Winn Kevin Apps Andrew Howard Geoff Marcy Howard Isaacson. R P > 5 R E arth. KOI-254. KOI-254. Cool: T eff < 4000 K (exact value very uncertain )

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Spectroscopic Orbits Of Kepler's Gas Giants KOI-254: A Case Study

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  1. Spectroscopic Orbits Of Kepler's Gas GiantsKOI-254: A Case Study John A. Johnson Sebastian PinedaMichael Bottom Zach Gazak Josh Winn Kevin Apps Andrew Howard Geoff Marcy Howard Isaacson

  2. RP > 5 REarth KOI-254

  3. KOI-254 • Cool: Teff < 4000 K (exact value very uncertain) • Faint: V = 16.9 • R★ = 0.65 R, M★ = 0.53 M • Period = 2.455 days • Transit Depth = 3.6%

  4. Kepler Johnson et al. 2011 in prep RP = ?? NickelLick Obs.

  5. ??

  6. Muirhead et al. (2011) No Main Sequence!

  7. Rojas Ayala et al. (2010) Rojas Ayala et al. (2011 in prep)

  8. Muirhead et al. (2011) On astro-ph NOW!

  9. An Empirical Approach • No reliance on atmosphere or evolution models • Broadly applicable, without need for a parallax

  10. A Photometric Calibration • J,H,K  MJ,H,K  M★, d(Delfosse et al. 2000) • V - K  [Fe/H], M★ (Schlaufman & Laughlin 2010) • r - J  MJ  M★ (West et al. 2005, Delfosse et al.) • a/R★ M★ (Seager, Mallen-Ornelas 2003) An example: K-band magnitude to Mass, distance

  11. Johnson, Gazak, Apps et al. 2011 in prep

  12. Johnson, Gazak, Apps et al. 2011 in prep Sample of nearby stars with known parallaxes, and hence known M★

  13. Why not optical spectroscopy?

  14. Keck Observatory Keck Observatory 400 Massive, Evolved Stars900 Sun-like dwarfs150 Low-mass M dwarfs with an average of 25 observations per star

  15. 50 individual spectra Final coadded spectrum

  16. 0.25 M 0.45 M M★ = 0.68 M Pseudo- continuum line region DecreasingMass

  17. Bottom, Pineda & Johnson 2011 in prep Increasing Mass

  18. Bottom, Pineda & Johnson 2011 in prep Decreasing [Fe/H]

  19. Bottom, Pineda & Johnson 2011 in prep rms = 8.4%

  20. Photometric x Spectroscopic

  21. KOI-254b Schlaufman & Laughlin (2010) Johnson & Apps (2009)

  22. Thank You Sebastian PinedaMichael Bottom Kevin Apps Zach Gazak Josh Winn Andrew Howard Geoff Marcy Howard Isaacson

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