/wakai

several youth indicators and other tools to constrain exoplanet ages

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wakai

wakai is the Japanese word for young. This repo contains several youth indicators and other tools to constrain exoplanet ages.

Cluster

  • 10 Myr

    • Upper Sco
    • TW Hya
    • nu Cha (11)
    • Beta Pic (23)

  • 15 - 25 Myr

    • Sco-Cen

  • 50 Myr

    • Tuc-Hor
    • IC 2391
    • IC 2602

  • 100- 150 Myr

    • Pisces-Eridani (120)
    • Pleiades (125)
    • AB Dor (150)

  • 250 Myr

    • M 34 (220 Myr)
    • Melange I
    • Group X

  • 300 Myr

    • NGC 3532

  • 400 Myr

    • M 48 (450 Myr)

  • 600 - 800 Myr

    • Praesepe (670)
    • Hyades (730)

  • 1 Gyr

    • NGC 6811

  • 2.5 Gyr

    • NGC 6819
    • Ruprecht 147 (2.7 Gyr)

See notebooks/cluster_catalog.ipynb

Isochrones

Kinematics

Gaia excess

Gyrochronology

Chromospheric activity indicator

  • log(R'_HK)
  • S_HK index: ratio of narrow flux to the background continuum flux
  • See description in Isaacson & Fischer (2010)

Chromospheric emission

  • Ca II K: 3933.5 Å
  • Ca II H: 3968.5 Å
  • H epsilon: 3970 Å

Activity vs color or Li

Hα absorption

  • 6562.8 Å

Na I doublet absorption

  • 5889.95 and 5895.92Å

Li I doublet absorption

Xray and UV emission

  • detection by GALEX with (NUV, 1750–2750 Å) and far-UV (FUV, 1350–1750 Å)
  • (NUV-J) and (J − K) colors and the empirical relations presented in Findeisen+2011

Cooling and contraction models

Plots

color/Teff - absolute magnitude

Prot vs color

  • B-V
  • V-K_s
  • M 48 (Barnes+2015)
  • M 34 (Meibom+2011)

Prot vs Teff

Li EW & Teff

Summary