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[gully]

The welter outline resides in document/README.md. Consider updating this outline to the present document.

[gully]

Outline

• Introduction
  • [x] Age, Mass, and rotation as predictors of evolutionary state.
  • [x] Starspots as a manifestation of rotation, uniqueness
  • [ ] Recent theoretical advances
  • [x] Layout of this paper
• Methods
  • [ ] Our limited understanding of starspot properties, observational biases (ref Table A1)
  • [ ] Interpreting lightcurves
    • [ ] Intro: limitations of "lightcurve inversions", cite (Basri, Roettenbacher)
    • [ ] Need for assuming temperature distribution
    • [x] Simplest Possible Analytic Starspot Model (SPASM)
    • [ ] Pathologically Asymmetric Two-temperature Hemispheres Equator-on Model (PADOTHEM)
    • [ ] Pole-on star with Any Starspot Distribution Model (PSASDM)
    • [ ] Need to assume "starspot-dominated" or "faculae dominated"
    • [ ] Practical considerations for monochromatic lightcurves-- fitting amplitude and (in the case of Kepler/K2) possibility of spurious secular trends.
    • [ ] Multi-term Lomb-Scargle and Fourier reconstruction
    • [ ] Equation Fourier reconstruction with linear coefficients + cross-validation
    • [ ] figure: Cartoon of starspot
  • [ ] Spectroscopy
    • [ ] Improved accuracy over Gully-Santiago et al. 2017
    • [ ] Philosophy: measurement versus detection
• Observations and data reduction
  • [x] IGRINS observations
  • [x] Ground-based photometric monitoring
  • [ ] K2 data, add in proposal IDs
  • [ ] bonus High resolution imaging to constrain multiplicity status?
  • [ ] bonus Gaia data -- polychromatic photometry? Distance? goodness-of-fit metric / binarity?
• Analysis
  • [x] K2 data
    • [x] Aperture selection, intercomparison of detrending techniques
  • [ ] Archival V-band photometry
    • [ ] Long-term trends
    • [ ] Global flux deficit
  • [ ] K2 detrending, aperture selection, intercomparison of detrending techniques
  • [ ] IGRINS two-temperature spectral inference
    • [ ] MCMC convergence and posterior predictive checks
      • [ ] figure: IGRINS Spectra
    • [ ] Internal consistency of vsini, v_z, GP hyperparameters
      • [ ] figure: Violin plot
  • [ ] Archival BRI-band photometry
    • [ ] Color interpretation?
• Results
  • [ ] V827 Tau has at least 23% coverage fraction of spots (K2)
  • [ ] V827 Tau has at least X Temp of spots (K2)
  • [ ] V827 Tau has at least 50% coverage fraction of spots (1990 Archival)
  • [ ] V827 Tau has at least X Temp of spots (1990 Archival)
  • [ ] V827 Tau has ~75% coverage fraction of spots with T_spot ~ Y (IGRINS + Starfish)
    • [ ] figure: T_spot versus f_spot plot with lightcurve constraints
• Discussion
  • [ ] Interpreting geometries with circumpolar active longitudes, or migrating active latitudes
  • [ ] Derived geometrical scaling factor and comparison to Rackham+ and Zhen+
  • [ ] Which portions of the IGRINS spectra are most informative?
  • [ ] Does the T_spot scatter represent probes of different atmospheric depths at different wavelengths?
  • [ ] Comparison to LkCa4
    • [ ] bonus figure: LkCa4 T_spot versus f_spot plot with lightcurve constraints
  • [ ] How do our results change if we relax our assumptions?
  • [ ] Are our results consistent with the polychromatic photometry?
    • [ ] bonus figure: Prediction of color amplitude versus time versus observations
  • [ ] What would you have derived for spot sizes based on each of the other seasons alone?
    • [ ] bonus figure: 1990 versus 2001 versus K2 epoch
  • [ ] Where does V827 Tau sit in a new HR diagram? (new Somers models)
    • [ ] bonus figure: PMS HR diagram with new Somers tracks
• Appendix
  • [ ] optional Table A1 of starspot characterization methods
  • [ ] bonus K2 Detection of flares
  • [ ] bonus K2 planet search-- transit / reflected light hot-Jupiter?