Spectroscopic orbits of kepler s gas giants koi 254 a case study
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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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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


RP > 5 REarth

KOI-254


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%


Kepler

Johnson et al. 2011 in prep

RP = ??

NickelLick Obs.


??


Muirhead et al. (2011)

No Main Sequence!


Rojas Ayala et al. (2010)

Rojas Ayala et al. (2011 in prep)


Muirhead et al. (2011)

On astro-ph NOW!


An Empirical Approach

  • No reliance on atmosphere or evolution models

  • Broadly applicable, without need for a parallax


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


Johnson, Gazak, Apps et al. 2011 in prep


Johnson, Gazak, Apps et al. 2011 in prep

Sample of nearby stars with known parallaxes, and hence known M★


Why not optical spectroscopy?


Keck Observatory

Keck Observatory

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


50 individual spectra

Final coadded spectrum


0.25 M

0.45 M

M★ = 0.68 M

Pseudo- continuum

line region

DecreasingMass


Bottom, Pineda & Johnson 2011 in prep

Increasing Mass


Bottom, Pineda & Johnson 2011 in prep

Decreasing [Fe/H]


Bottom, Pineda & Johnson 2011 in prep

rms = 8.4%


Photometric

x

Spectroscopic


KOI-254b

Schlaufman & Laughlin (2010)

Johnson & Apps (2009)


Thank You

Sebastian PinedaMichael Bottom

Kevin Apps

Zach Gazak

Josh Winn

Andrew Howard

Geoff Marcy

Howard Isaacson


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