A: NStED (the NASA Stellar and Exoplanet Database) is no longer supported, but the exoplanet data are still available as part of the NASA Exoplanet Archive. The Exoplanet Archive also contains stellar parameters for exoplanet host stars and a limited number of data sets available for bulk download (see the Bulk Download page).
Searching by stellar parameters for non-planet-hosting stars is no longer available.
A: Each of the exoplanet-related sites have different criteria that are used to include new exoplanets. The NASA Exoplanet Archive includes planets for which the planetary and orbital properties are publicly available, usually through refereed publications. We also restrict our list to those objects whose detection and planetary status is unambiguous. For more information about the archive's criteria for classifying and including planetary objects, see the Exoplanet Criteria page.
A: The list of planets is routinely updated once per week but may be updated more frequently depending on new significant exoplanet discoveries.
A: The pre-generated plots are produced by using the currently available data within the Exoplanet Archive. Thus, whenever there is an update to the archive information, the plots are re-created to ensure they are as current as possible. This purpose of these plots is to provide to the community fast access to presentation material that describe the current state of the exoplanets field in terms of their number and our understanding of their orbital and physical characteristics.
A: The Exoplanet Archive welcomes contributions that meet the guidelines outlined in our documentation.
A: The objects KOI 68.01 (KepID 8669092), KOI 266.01 (KepID 7375348), KOI 414.01 (KepID 5872150), KOI 948.01 (KepID 9761882), and KOI 1319.01 (KepID 4078157) are no longer considered to be false positives.
A: That object is now considered to be a false positive.
A: TCE stands for Threshold Crossing Event and is identified by the Kepler pipeline. A Threshold Crossing Event (TCE) is a sequence of transit-like features in the flux time series of a given target that resembles the signature of a transiting planet to a sufficient degree that the target is passed on for further analysis. For more information, see the Kepler documentation list. The interactive TCE table is available here.
A: KOI stands for Kepler Object of Interest. KOIs are identifed from the list of TCEs for further study. Some KOIs will be classified as false positives, while others will be classified as planetary candidates. Starting with the analysis of quarter 1 to 12 data (Q1-12), the Kepler project is providing the community with the KOI list during the vetting process, so dispositions of a given KOI may change as more information is obtained or more analysis performed. For more information, including a list of all KOI tables, see the Kepler documentation list. The cumulative KOI table is available here.
A: Information on the assignment of Kepler numbers to confirmed or validated planets is available on the Kepler Numbers page. A list of all Kepler numbers and their corresponding KOI numbers is available as an interactive table.
A: Parameter values in the confirmed planet table come from the published literature, while parameter values in the KOI table come from the Kepler pipeline. Therefore, KOIs which have been published as confirmed or validated planets often have different parameter values in these tables.
A: The KOI table is produced by the Kepler project based on the process described here. Some confirmed planets, for instance the circumbinary planets (such as Kepler 16), were identified outside of the Kepler project or by other means and are not in the KOI table. Confirmed or validated planets in published papers will be included in the confirmed planet table regardless of their status in the KOI table. A list of all Kepler numbers and their corresponding KOI numbers is available as an interactive table.
A: Yes, it is possible to use your own planet parameters by selecting any existing object from either the Transit and Ephemeris Predictor: All Confirmed Planets or Transit and Ephemeris Predictor: Kepler Objects of Interest tables (click on the corresponding tab within the table interface to view the two data sets). This will take you to a form you can customize by replacing any of the default values.
A: To see a list of all transiting planets, use the Planet Transit Flag under Planet Columns in the Confirmed Planet table. All transiting planets will have a value of 1 in this column. Note that some transiting planets were discovered by another method, such as RV, before they were known to transit, so using the Discovery Method column will not provide a complete list.
A: Some of these planets have KOIs that were assigned early in the mission when candidates were identified by hand but these candidates are not identified by the pipeline processing which is currently used to generate TCE and KOI lists. Other KOI numbers, particularly those with decimal numbers of 10 and above (e.g. KOI 244.10) are not assigned by the Kepler project and are often used by authors to denote non-transiting planets in Kepler systems with known transiting planets or candidates.
A: The archive currently has data from the first WASP public data release that were acquired from 2004 to 2008. Not all confirmed WASP planet light curves are available in the first public WASP data release, but may be included in future releases.
A: The Exoplanet Archive gives the stellar parameters used to derive the planetary parameters. If planets within a multiple system come from different papers (e.g. Kepler-186), then the stellar parameters can vary.
A: The archive designates a set of default parameters for each planet. This set is drawn from a single published reference to ensure internal consistency (i.e. to avoid having, for example, a planet radius from one paper and an equilibrium temperature from a second paper that might have used a different radius in the derivation). We endeavor to choose the most complete set of parameters available, with a secondary emphasis on drawing parameters from papers comprising multiple data sets, for additional consistency across planets. If the paper with the most complete set of parameters is missing a parameter shown in the table, it will be blank. Users should also note this means the "default" value for a given parameter, may not necessarily be the most precise value published for that parameter. However, values published in other papers can be found by viewing the Overview page for a given planet, where multiple sets of parameters can be displayed. To view a planet's Overview page, click on the blue info icon next to an object name and then click the first link in the pop-up window.
A: Starting with OS X Lion, Apple changed how scroll bars appear (and disappear) by default, making them fade away when not in active use. This can make it difficult or impossible to scroll in some interfaces, including our interactive tables. This feature is often most noticeable in web browsers, but actually affects multiple programs. To change this behavior, you must change the operating system setting to always show scroll bars.
A: The planetary parameter values in the KOI table, including the radius, are supplied by the Kepler project from their pipeline and fitting procedures. To maintain a consistently constructed catalog, planetary candidates are not excluded from the KOI table based on their parameter values, even when those values are obviously problematic. The possible issues with these values are discussed in Mullally et al. 2015, particularly Section 7.
In the Confirmed Planets table, values are sourced solely from the peer-reviewed literature. Usually both the planetary and stellar parameter values are different from those provided by the Kepler project, depending on the work done by the team that confirmed or validated the planet.
A Prior to May 4, 2015, the archive contained a KELT data set that was specifically the Praesepe field, though it was referred to as "KELT" in the archive. We have since released a larger KELT data set, so KELT now refers to the larger data set and the older, smaller data set is referred to as KELT-Praesepe.
A: Non-transiting planets discovered via the transit timing variations of another planet in the system will not have their TTV flag set since they do not themselves demonstrate TTVs.
A: The Exoplanet Archive is not designed as a citizen science project, but all data contained in the archive have been published and can be used for additional research with the appropriate acknowledgements. Information on exoplanet citizen science projects can be found at the following sites:
A. In additional to providing extensive user documentation in the form of user guides for tools and services and data release documentation, the archive announces tools and data updates on the homepage almost every week. News items are shared on Facebook, Twitter, Google Plus, and our email listserv and archived on the web site. Additional tips on using the Exoplanet Archive more effectively are also compiled in the Tip Archive.
Last update: 9 December 2016