Transiting Planet Resources in the Exoplanet Archive

This page describes the resources available in the Exoplanet Archive for planets discovered using the transit technique.

Technique Overview

The transit method of discovery relies on the fact that, if a planetary system is aligned in a certain way with respect to the Earth, the planets will pass between the Earth and the host star, periodically blocking some of the starlight. By monitoring the brightness of the host star, these transit events can be observed, and used to measure the properties of the planets in the system. More explanation can be found here. In addition, variations in the times that the transits are observed from strict periodicity (or times of eclipses in a stellar binary system) can be used to infer the presence of additional planets in the system tugging on the transiting planet. Finally, additional modulations in the stellar light curve due to the planet (Doppler beaming, ellipsoidal variations and reflection modulations) can also be used to confirm its presence.

Confirmed Planets

Planets discovered via the transit method that meet the Archive's exoplanet criteria are included in the Confirmed Planets table.

  • To see only the planets discovered by the transit method, enter transit in the filter box under Discovery Method.
  • Some planets are found to transit after being discovered by alternate methods (e.g. the radial velocity method). To see all planets that transit, click the Select Columns link and select the Planet Transit Flag column (under Planet Columns). Click on Update Selection and close the Column Controls pop-up box. Enter 1 in the filter box under Planet Transit Flag to recover the full list of transiting planets.
  • To see the transiting planets which show transit timing variations, enter 1 in the filter box under TTV Flag.
  • To see the planets discovered via the transit timing variations of another planet in the system (which do not themselves transit), enter transit timing variations in the filter box under Discovery Method;
  • To see the planets discovered via eclipse timing variations in a stellar binary, enter eclipse timing variations.
  • To see the planets discovered by additional light curve modulations, enter orbital brightness modulations.
  • To see planets discovered due to variations in pulsar timing, enter pulsar timing variations.
The available parameters in the Confirmed Planets table are determined by what is published in the discovery and follow-up papers. For transiting planets, these are usually the planet transit and orbit properties, typically including, at minimum, the period and radius of the planet and the stellar properties, typically including, at minimum, the radius and magnitude of the star.

Transit Survey Data

The Archive hosts light curves for the following projects:

These light curves can all be viewed with our plotting tools via links directly from each target, or called by our Periodogram service. These are available as a set from the Bulk Download page.

Contributed Data

The Exoplanet Archive serves 540 light curves for stars currently known to host exoplanets. These light curves of exoplanet transits were obtained by amateur astronomers from around the world and collected by B. Gary of the Amateur Exoplanet Archive. These are available as a set from the Bulk Download page.

Available Tools for Transiting Planets

Light Curve Plotting: Light curves hosted by the Exoplanet Archive can be viewed by clicking on the blue icon in the table in which the target is listed and selecting Time Series and Periodogram. The plotting is fully interactive and resulting plots can be customized and saved. From the plotting service, the light curve can be sent directly to the Periodogram service, described below.

Periodogram: This service allows users to extract periodic signals from light curves hosted by the Exoplanet Archive, or uploaded by the user. There are currently three algorithms that are supported by the Periodogram service: Lomb-Scargle, Box-fitting Least Squares (BLS) and Plavchan. The light curve can then be viewed, phased at the detected periodic signals.

Transit and Ephemeris Predictor Service: This service is a planning tool for astronomers who want to know when scientific events, such as transits and orbital phase quadrature, will be happening, and when and where they can be observed. Ephemerides are provided by the Exoplanet Archive, or custom values can be supplied by the user. Ground-based and space-based observatory locations are supported.

Transmission Spectroscopy: The Exoplanet Archive is populating and maintaining a table of the transmission spectra that have been obtained for a large number of transiting planets. The spectra can be interactively plotted and downloaded.

Additional Links

Last updated 24 May 2016