A walkthrough of some of the features of the notebook, and how it can be used to identify some of the common false positives. The walkthrough primarily uses TIC 55525572 / TOI 813.01, the first planet candidate from Planet Hunters TESS, as the example.
- Enter the
TIC,sectorin the "Enter TIC" section.- a side navigation to quickly jump to various sections.
- Plot TIC's lightcurves across sectors
- Interactively zoom in to a potential transit.
- Plot the zoomed in transit
- you'd need to specify
transit_specs. The interactive plot above produces a sample one that you can copy/paste. - The
transit_specsis also used as the default for most subsequent sections, in addition to plots here.
- you'd need to specify
- Visualize the transit times across sectors
- to see if the candidate
epoch+periodmatches observation.
- to see if the candidate
- Interactively inspect the lightcurve at per-pixel level around the dip.
- the TIC is usually around the brightest pixel at the center of aperture pixels(outlined in white).
- Aperture pixels: the pixels which are the primary contributors to the "official" lightcurves (on MAST, Planet Hunters TESS, etc.)
- Visualize flux changes at per-pixel level.
- helpful to identify when the dips are centered off target.
- In this specific case, the changes are so small that it is not helpful.
- Example where per-pixel plot shows dips were off target. The following is from TIC 441058522, sector 36:
- Overlay with the Skyview, you can find potential contamination sources:
- in this case, a candidate (around the center of the dip) would be TIC 441067223, pointed by red arrow below.
- For this TIC, one can draw the same conclusion from the centroid offset diagnostics in its TCE vetting report summary. But not every dips you encounter have a TCE.
- Per-pixel plot can help to visualize other kinds of problems too. E.g., an asteroid passed through the field. Consider the following dip from TIC 38085803:
- Per-pixel plot showed the dip is due to an asteroid passing through:
