- 02/23/2017: The catalog was updated with four potentially habitable planets (d,e,f,g) out of the seven TRAPPIST-1 planets. Three of those (e,f,g) are in the conservative habitable zone and shown in the top figure as the more interesting ones. Wolf 1061 c was excluded from the catalog because it seems to be too hot given the recent study of Kane et al. (2017). However, Wolf 1061 d was added instead, now in the habitable zone. A surprising addition is KIC-5522786 b, this is an Earth-sized planet barely in the habitable zone of a Class A star. These stars are hot and short lived and not good candiates for habitable worlds. KIC-5522786 b is probably a very hot early Earth-like world and was added to the catalog as something interesting nevertheless.
December 2016July 2016
- 12/05/2016: Today is the 5th Anniversary of the Habitable Exoplanets Catalog.
- 07/19/2016: Crossfield et al. (2016) reports the discovery of a planetary system of four Earth-size planets around the M-dwarf star K2-72. Up to two of these planets might be in the habitable zone. However, there are known corrections with the published values. We are waiting for additional results on this system to update the Habitable Exoplanet Catalog with the latest data.
- 03/28/2016: The Habitable Exoplanets Catalog (HEC) was updated with K2-9 b. The main infographics now only include the top objects of interest (i.e. the conservative sample) since they were becoming very cluttered with all the planets in the catalog.
- 01/08/2016: The Habitable Exoplanets Catalog was updated with Wolf 1061 c. Planets Kapteyn b and HD 40307g are now listed as unconfirmed based on new results. The catalog is now divided in a conservative and optimistic sample. Other parts of the website, such as the Data Section, will be updated in the following days.
- 10/14/2015: HEC was updated with the latest exoplanet data.
- 04/02/2015: The planet EPIC 201912552 b discovered by Montet et al. (2015) was added to HEC. This planet is now the closest transiting planet to Earth (~110 light years) of the objects of interest listed in HEC. This makes the planet a prime target for further observations in search for atmospheric signatures. EPIC 201912552 b receives about the same insolation as Earth but it is a large world (~2.2 Earth radii) and probably a Mini-Neptune, but there are examples of dense planets with similar sizes (e.g. Mega-Earth). HEC was also update with the recent NASA kepler data release (Q1-Q17) and there are more candidates for potentially habitable worlds in this new dataset, a total of over 110 now.
- 03/02/2015: HEC is being updated with minor fixes during this month. This includes new plots and visualizations.
- 01/16/2015: A nearby transiting potentially habitable world was detected by the NASA Kepler K2 mission, an excellent system for further observations. EPIC 201367065 d will be added later today to the catalog. For more details check the paper by Crossfield et al. (2015).
- 01/06/2015: Six NASA Kepler planets were added to the Habitable Exoplanets Catalog. One is Kepler-296 e, already confirmed in 2014, after revised properties. Kepler-438 b, Kepler-440 b, Kepler-442 b, Kepler-442 b are new confirmed planets while KOI-4427 b is still unconfirmed. Kepler-438 b and Kepler-296 e are now two of the most Earth-like planets based on insolation and size alone.
- 12/30/2014: A new plot of all the planets in the habitable zone was created. The plot shows the planets size against the parent star effective temperature and incident stellar flux.
- 12/05/2014: Today is the third anniversary of the Habitable Exoplanets Catalog. We added the planet candidate Gliese 3293 c, the farthest (~60 light years) known potentially habitable world with measured mass. We updated many plots and tables to be more user friendly with links to additional data. We also updated the definition of terran and superterran worlds to match recent results (i.e. planets with less than 1.5 radii are more likely to be rocky). There are many plans for next year.
- 11/24/2014: There was a significant update on the NASA Kepler candidates impacting, among other things, the number of Earth-size planets in the habitable zone (now eight).
- 08/04/2014: The main catalog infographics were updated to exclude Gliese 581 d and Gliese 581 g. You can get the previous state images (July 03, 2014) as a ZIP file from this link.
- 05/18/2014: The Habitable Exoplanets Catalog was updated with a new habitable zone definition. Many images were updated with this result.
- 12/23/2013: HEC was updated with recent Kepler data that includes a new 'nearby' candidate for an Earth-like world. A new batch from Kepler was also analyzed.
- 12/05/2013: Today is the second anniversary of the Habitable Exoplanets Catalog. We updated the ESI ranking of some exoplanets (not much change). We added new habitable zone plots to the Results section and started a new project to estimate the number of habitable worlds from our stellar neighborhood to the whole universe.
- 03/13/2013: HEC shows now the frequency, distance, and probability of Earth-like planets.
- 02/26/2013: We are testing a new ESI scale. Although the original ESI is much better at evaluating similarity to Earth it depends on estimated/modelled parameters. The new scale is only based on observed values (size or mass, and stellar flux) so it is easier to use. The main difference between the two scales is that now potentially habitable exoplanets can go as low as 0.5, but in both scales Earth-like planets should have an ESI of over 0.8.
- 02/18/2013: The exoplanets HD 85512 b and Tau Ceti f do not longer meet the new habitable zone criteria to be considered potentially habitable worlds. The NASA Kepler candidates sample was also reduced by half. We also announced our SPHERE project, an effort to search for Earth-like exoplanets and exomoons using the NASA Kepler data.
- 09/17/2012: Stats of for all exoplanets were updated including the full database.
- 07/25/2012: We are working on new content for the home page of the Habitable Exoplanets Catalog.
- 07/20/2012: Five Potential Habitable Exoplanets Now. Gliese 581g was added to the main catalog.
- 07/09/2012: New planets were added and updated in the main database.
- 05/22/2012: Three new cold jovians were added to the general catalog.
- 05/22/2012: Planets around HD 204313 and HU Aqr(AB) were added.
- 05/21/2012: The planets from KOI-152 are now considered unconfirmed. The total of confirmed is back to 767 from 770.
- 05/15/2012: The database was updated with one cold and one hot jovian in HD 142 and HD 159868, respectively.
- 05/14/2012: The database was updated with two new hot neptunian and one hot jovian exoplanets in KOI-152.
- 05/12/2012: The database was updated with two new hot jovians exoplanets in KOI-872.
- 02/29/2012: The NASA Kepler press release is available here. We took more time analyzing the Kepler data and our press release is now targeted for tomorrow March 1.
- 02/28/2012: HEC was updated with the Feb 2012 NASA Kepler candidates. Stats here and full data here. A press release discussing the update and additional analyses will be posted tonight. We are working on some visualizations.
- 02/27/2012: New NASA Kepler planet candidates will be available here soon (ArXiv Paper). HEC now identifies stars from the Catalog of Nearby Habitable Systems (HabCat).
- 02/13/2012: New data for GJ 667Cc is now available in the DATA section. New metrics and a full database of confirmed exoplanets was also included.
- 02/08/2012: Two Earth-sized planets orbiting Kepler-20 (Nature Paper).
- 02/07/2012: Added a new list of unconfirmed exoplanets that includes two potential habitable exoplanets: the famous Gliese 581 g, and Gliese 667C d, a possible second habitable planet in the Gliese 667ABC stellar system.
- 02/06/2012: Over 200 previously unclassify exoplanets are now classify in the Stats section. There are still 66 that we don't have enough stellar information to categorize them with respect to their habitable zone. The total number of predicted potential habitable exomoons increased from 27 to 30.
- 02/04/2012: More visualizations of Gliese 667C c.
- 02/02/2012: A Potential Habitable Exoplanet in a Nearby Triple Star System. (Carnegie Institution PR). We nicknamed "Vulcan" the new exoplanet Gliese 667C c. Vulcan was part of a triple star system in the Star Trek sci-fi universe.
- 12/22/2011: New section: Top 10 Lists of Exoplanets.
- 12/20/2011: Kepler-20 e and f (KOI-070) two Earth-size non-habitable planets: Nature and ApJ paper.
- 12/05/2011: The Habitable Exoplanets Catalog (HEC) is available now. Kepler-22 b (KOI-089) did not pass our initial habitability assessments to be included in the catalog as a potential habitable exoplanet. A more detailed analysis is in progress. Here are some scientists opinions on the habitability of Kepler-22 b.