Period search service
Please enter the lightcurve file name and period search parameters:
The lightcurve should be a simple ASCII file in the "JD mag", "JD mag mag_err", or VaST format.
The Catalina Surveys
.csv files are also supported.
The lightcurve may contain comment lines. Note, that (unless the
Catalina Surveys .csv file is supplied) the program expects time to be
expressed as a full JD, not MJD. If MJD (or any other form of truncated JD)
is used in the lightcurve file, the labeling of plots will be incorrect.
Also, the Heliocentric correction cannot be applied to such lightcurves.
Example lightcurves may be found
here, here, and
(links to data files are at the bottom of these pages).
Two period search methods are currently implemented. One is based on
Lafler & Kinman (1965, ApJS, 11,
216) paper. You may find a simplier explanation of this method in Russian
other is Deeming
(1975, Ap&SS, 36, 137) Discrete Fourier Transform (DFT) method (see also the discussion
in this paper).
For long computations you may need to change the timeout settings of your
web browser. In Firefox it can be done by typing "about:config" in the address
bar and then filtering on "timeout". The paerameters you need to change are
probably called network.http.connection-timeout
This period search service is also available at the mirror sites:
You may download the latest source
code distribution and install the period search service at your own web server.
This program is free software provided under the terms of the GNU General Public
If you have questions, bug reports or suggestions how to improve this
service, please fell free to contact the author (Kirill Sokolovsky) via e-mail: kirx[at]scan.sai.msu.ru
A similar web-based period search service supporting a different set of
algorithms is provided by
the NASA Exoplanet Archive