Astronomy 575: Project 03 (Fitting via a Grid Search)


Sample analysis plots for HD 95128:

(Left) Plot of rms as a function of period; the spread in rms for each period value is caused by varying the phase from 0 to 2 radians. The red points are the lowest rms values for each period value.

(Right) Plot of rms as a function of phase; the spread in rms for each phase value is caused by varying the period from 0 to 1460 days. The red points are still the lowest rms values for each period (not phase) value.


(Left) As above, with a factor of 25 finer sampling in period.

(Right) As above, with a factor of 25 finer sampling in period.


(Left) Contour plot showing the distribution of rms values in period and phase.

(Right) Same contour plot, showing only the valleys (low rms values).


Same contour plot, using RGB colors to indicate high to low rms values.


(Left) Surface plot showing the distribution of rms values in period and phase.

(Right) Same surface plot, from different viewpoint.


(Left) Overplot of time and velocity data on top of best-fit sine wave.

(Right) Overplot of time and velocity data on top of second best-fit sine wave.


One good reason to care about good coding practice ...

[xkcd]


Radial Velocity Planet Search Results
  #1 #2 #3 #4 #5 #6 #7
  Candace Kenza Diane Michael Jacob Sean Meredith
  34 7 4 19 17 74 120
FGS - A
Period 3.416 3.416 3.417 3.416 3.417 3.416 1.231
Phase 5.227 5.173 5.207 5.181 5.258 5.194 1.966
RMS 0.160 0.161 0.167 0.162 0.161 1.587 0.470
FGS - B
Period 63.326 63.379 63.451 63.349 63.341 63.325 113.315
Phase 3.811 3.879 4.002 3.808 3.857 3.817 0.025
RMS 0.222 0.223 0.232 0.223 0.178 1.944 0.811
FGS - C
Period 2.986 2.986 2.986 2.985 2.986 2.986 1.504
Phase 3.872 3.898 4.205 3.731 4.027 3.789 1.322
RMS 0.172 0.176 0.214 0.179 0.165 1.750 0.594
FGS - D
Period 4.231 4.230 4.231 0.807 4.233 4.235 732.330
Phase 0.006 5.993 0.011 0.167 0.779 0.613 0.0378
RMS 0.204 0.226 0.203 0.372 0.466 6.185 0.761
FGS - F
Period 1099.3121099.1631114.0431099.4761097.1031100.007 560.664
Phase 3.523 3.523 3.639 3.511 3.503 3.526 6.044
RMS 0.152 0.152 0.160 0.152 0.116 1.111 0.615
FGS - G
Period 4.695 4.693 4.694 4.694 4.694 4.6941431.810
Phase 1.951 1.550 1.838 1.888 1.794 1.779 6.213
RMS 0.338 0.346 0.337 0.337 0.300 5.225 0.623
FGS - H
Period 24.348 24.352 24.335 24.346 24.352 24.347 0.958
Phase 4.046 4.089 3.916 4.046 4.097 4.020 5.403
RMS 0.226 0.227 0.233 0.227 0.206 2.072 0.363