TTV Libraries

This page lists the public TTV libraries available in LcTools. A TTV library is a CSV file hosted on Google Drive containing the Transit Timing Variations associated with a set of mission-based or community-based signals. Signals include TOIs, CTOIs, K2OIs, and KOIs.

Each TTV in the file shows the time difference between the observed time and calculated time of a transit signal in a light curve. TTVs for a signal have two primary causes:

Other orbiting bodies in a star system which perturb the orbit of the primary object thereby changing its transit timings.
An inaccurately defined reference epoch or transit period for the signal as provided by the mission or community.

The following TTV libraries are available:

Public TTV Libraries

* TESS/TESS_SPOC/TESS_QLP/TESS_ELEANOR sector numbers.

To access a library, click on the applicable link in the above table. You will be taken to Google Drive on the Web. Click the Download icon located in the top right corner of the web page. After file is downloaded, open it in Excel or Notepad as desired.

Note that TTV libraries are automatically imported by LcSignalFinder and LcViewer when the first light curve file for a project is loaded. You can inspect the TTVs for a signal in LcViewer by placing the cursor on any color coded transit for the signal and pressing the Ctrl+t key. A TTV (O-C) diagram will open.