2018 Exoplanet Archive News

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For previous years' news, see the 2017, 2016, 2015, 2014, 2013, and 2011-12 archives.

For a compilation of weekly tips that have appeared in past news items, see the Tip Archive.

To view only the most recently added planets and updated parameters (default and non-default), see this pre-filtered and pre-sorted interactive table.

Note to our users: We've changed our link format in the news so you can easily access overview pages for both planet hosts and their planets. Clicking on either the host name or the planet letter takes you to the object's respective overview page.

June 15, 2018

Announcing the New Composite Planet Data Table!

In response to user requests, we've created the Composite Planet Data Table—a more complete table of planet parameters drawn from multiple references and/or calculations. This table is intended to help users who need a more "filled in" table to enable a statistical view of the known exoplanet population and their host environments. Each parameter's reference is provided in the table.

Please use this table's information on any one planet or stellar host with caution, as the parameters in a given row may not be self-consistent.

Learn more about the table, and its caveats, on its About page, and get details on how the archive calculates the table's values on the Composite Calculations page.

Access the table from its button in the Work With Data area of the home page:

...or from the Data pull-down menu on any archive web page:

The Composite Planet Data table is also accessible through the our application programming interface (API). Read the API User Guide to learn how to construct a query for command-line or automated data retrieval. All of the available planet and stellar parameters and their descriptions are listed in the Composite Planet Data Table Definitions document.

If you are not sure whether to use the original Confirmed Planets table, the Extended Planet Data table, or the new Composite Planet Data table for your research, the following graphic illustrates their differences. More explanation is provided in the About the Composite Planet Data Table document.

Once you've had a chance to work with the new table, please let us know what you think! Contact us through social media, or submit a Helpdesk ticket.

June 7, 2018

We've added five MORE planets this week: HD 47366 b and c, HD 89345 b (a.k.a. K2-234 b), EPIC 211945201 b (a.k.a. K2-236 b), and NGTS-3 A b. View their data on their respective Planet Host or Confirmed Planet overview pages, or go to the Confirmed Planet interactive table.

May 24, 2018

Five transiting planets have been added to the archive this week, and one planet, BD+20 1790 b, was removed based on Carleo et al. 2018. The new planets are: HATS-43 b, HATS-44 b, HATS-45 b, HATS-46 b, and HATS-7 b. View their data on their respective Planet Host or Confirmed Planet overview pages, or go to the Confirmed Planet interactive table.

May 17, 2018

This week we've added one microlensing planet, OGLE-2017-BLG-1434L b, which is a super-Earth that orbits a very small and cold M-dwarf. Because the host star is so small and cold, the planet is located about twice the distance from the star's "snow line," which is where where ice forms in the system. For comparison, the snow line in our Solar System is 2.7 AU; the snow line from OGLE-2017-BLG-1434L is only 0.6 AU.

More interesting details about the planet and its host can be viewed on their respective Overview pages, and in the Confirmed Planet interactive table. Also, the microlensing model solutions can be found in the Microlensing Planets interactive table.

April 26, 2018

Eight More Planets! This week the archive added KPS-1 b, the first transiting planet discovered by an amateur astronomer; K2-233 b, c, & d, three small planets orbiting a bright nearby K-star; 24 Boo b and gam Lib b & c, which are planets orbiting evolved giant stars; and OGLE-2017-BLG-0373L b, a Saturn-sized planet orbiting an M-star.

View the planets' data in the Confirmed Planet interactive table, or click on the host star or planet names above to view their respective overview page.

We've also made a series of data updates, including new parameters for the K2-155 system, model parameters for OGLE-2017-BLG-0373 b in the Microlensing Planets Table, and a series of stellar and planet parameter updates based on Gaia data (Stassun, Collins & Gaudi 2017).

April 12, 2018

Six More Planets! This week's newcomers are HATS-39 b, HATS-40 b, HATS-41 b, HATS-42 b, HD 158996 b, and OGLE-2017-BLG-1522L b. View their respective Overview pages, or the Confirmed Planets interactive table.

2017 UKIRT Data Added: All data from the 2017 UKIRT Microlensing Survey of the Galactic bulge are now publicly available here on the NASA Exoplanet Archive! This release increases the archive's UKIRT holdings to more than 52 million light curves.

The 2017 data are in two near-infrared filters (H and KS) and cover 10.5 square degrees. An initial analysis of these data led to the first microlensing planet discovered in the near-infrared: UKIRT-2017-BLG-001L b. At over 20,000 light years away from the Earth, this UKIRT-discovered microlensing planet is one of the most distant exoplanets known.

Browse the UKIRT documentation for details, search for specific time series, or download the data in bulk. See the UKIRT Figures page for coverage maps.

April 6, 2018

Four Planets Added: We've added K2-231 b, K2-232 b, Kepler-1655 b, and MOA-2010-BLG-117L b this week. View their respective Overview pages, or the Confirmed Planets interactive table.

We've also removed HD 202206 b based on Benedict and Harrison (2018).

March 26, 2018

We've added two new planets this week that were discovered using the microlensing technique. The first planet, UKIRT-2017-BLG-001L b is the first microlensing planet to be detected solely in the infrared. The second planet, OGLE-2017-BLG-0173L b, is a super-Earth that is similar to the K2-18 system, where the b planets have similar Earth masses and orbit very closely to their parent stars, making comparisons of these two systems potentially very interesting.

View the data for both planets on their respective Confirmed Planet Overview pages, or the Confirmed Planets interactive table.

We've also added new parameters for the K2-229 system that appears in Nature today, "An Earth-sized exoplanet with a Mercury-like composition."

Lastly, we've also added new transmission spectra for WASP-39 b, which was recently found to host a large amount of water in its atmosphere.

March 8, 2018

We have some exciting updates this week!

  1. Redesigned Transit and Ephemeris Service: The Transit Service is a planning tool for astronomers who want to know when exoplanet events, such as transits and orbital phase quadratures, will be happening, and when they can be observed. The pedictions are based on information contained in the NASA Exoplanet Archive from the published literature, or input by users.

    This redesigned and enhanced version accommodates several new features, including:

    • Access to more data sets, including K2 Candidates,
    • the ability to upload multiple files, each with up to 100 object names,
    • the ability to load parameters from specific references,
    • the addition of new observation planning parameters.

    In addition, the service now allows users to specify settings for ephemeris selection, algorithm preference, and target visibility constraints. Learn more about the service in the updated User Guide, or start using the service to get some predictions.

  2. Updated Microlensing Table! We have released a revamped version of our table dedicated to exoplanets discovered using the microlensing technique! The new table identifies a default model for each planet and is designed to automatically filter the table to show only the default model for each planet. The table also features an expanded array of microlensing-specific parameters, now includes column groupings, and is replete with revised and updated documentation.

    The table is also now accessible by command line using the archive's application programming interface, which can be used for automated queries. See the API User Guide for more information.

    Currently, the database contains only the default model for each of 12 microlensing exoplanets, as well as one non-default model for one of those 12 exoplanets. Over the coming months we will continue to ingest models, default and non-default, for all of the published microlensing exoplanets.

    You can access the Microlensing table in the Data drop-down menu from any archive web page.

  3. One new planet added! This week we have added Kepler-1654 b, discovered and characterized in large part by NExScI project scientists. This Jupiter-sized planet is one of the longest-period planets known to transit, with a 2.8-year orbital period and transits lasting almost an entire day (23 hours). With only five other transiting planets known with longer orbital periods, Kepler-1654 b represents an opportunity to characterize the atmosphere of a Jupiter-like planet in a Jupiter-like orbit around a Sun-like star.

    See its Confirmed Planet Overview page for the data.

March 1, 2018

One new microlensing planet, TCP J05074264+2447555 b, from the Transient Objects Confirmation Page, has been added this week, as well as three new emission spectra for WASP-103 b, KELT-1 b, and KOI-13 b. The new planet is about half the mass of Neptune and orbits a star that is only 380 pc away—making it the closest known microlensing discovery to date.

Find the new planet in the Confirmed Planets table and the spectra in the Emission Spectroscopy table.

February 22, 2018

This week we have added the HD 215152 system, which contains four super-Earth mass planets with periods shorter than 26 days, discovered using the radial velocity method. The Confirmed Planets interactive table contains all the archive's confirmed planet data, and this pre-filtered table contains only the new planets.

February 15, 2018

With 95 newly confirmed K2 planets added this week, the total K2 planet count now exceeds 300! This brings the total number of confirmed planets to 3,700.

One of the interesting discoveries is a planet in a 10-day orbit around HD 212657, which is one of the brightest stars found by Kepler and K2 to have a transiting planet, making this planetary system amenable to more detailed follow-up and characterization. The planets found in this work, as with Kepler, are mostly super-Earths and mini-Neptunes.

Read the Mayo et al. 2018 discovery paper and press release, and browse the planet data in the Confirmed Planet interactive table. (To display the new planets at the top of the table, scroll to the table's far right to the Date of Last Update column, and filter on 2018-02-15. See the user guide for instructions.)

This work was led by Andrew Mayo, who, as a Harvard undergraduate, led a group of scientists from institutions around the world, including NExScI. He's now a Ph.D. student at the National Space Institute at the Technical University of Denmark. Well done, Andy!

Image credit: Andrew Mayo, Technical University of Denmark

February 5, 2018

We have a small bumper crop of K2 planets this week, as well as KELT and TAPAS discoveries. The 17 new planets and their stars are: K2-146 b; K2-147 b; K2-148: b, c, & d; K2-149 b; K2-150 b; K2-151 b; K2-152 b; K2-153 b; K2-154: b & c; K2-155: b, c, & d; KELT-21 b; and BD+48 740 b.

There are also several additions to stellar and planet parameters for K2-117 b & c, K2-122 b, and K2-123 b.

View the planets' data in the Confirmed Planet interactive table, or click on the host star or planet names above to view their respective overview page.

January 25, 2018

Added: Two planets orbiting lithium-rich giants!

HD 238914 b and TYC 3318-01333-1 b are two massive planets found around evolved giant stars whose atmospheres contain lithium. This discovery is significant because lithium-rich stars that host planets support a theory that evolving stars can swallow planets that are in inner orbits—evolved, red giant stars like these shouldn't have lithium in their atmospheres, but swallowed planets would pollute them. These new planets in the outer reaches of these stellar systems suggest that inner planets were indeed engulfed by the stars during their evolutionary expansion into giants.

View the planets' data in the Confirmed Planet interactive table. You may also click on the host star names above to view their respective Confirmed Planet Host Overview page.

One Planet Removed

We have also removed GJ 15 A b from the archived based on a published refutation. See the Removed Targets page for details.

January 18, 2018

Three planets added this week!

K2-141 is a K dwarf star containing two planets: an ultra-short period (6.7 hours) super-Earth with a mass five times that of the Earth (K2-141 b), and a Neptune-sized planet in an eight-day orbit (K2-141 c). The density of the super-Earth is consistent with the planet having a rocky composition, with iron making about < 70% of the mass.

We've also added HATS-36 b, which is a Sun-like star hosting a Jupiter-sized planet in a four-day orbit. Discovered by the HATSouth Exoplanet Survey, HATS-36 was also observed by K2 in Campaign 7 and has also been named K2-145.

View the planet data in the Confirmed Planet interactive table, or see each star's Confirmed Planet Host Overview page for a summary of its stellar and planetary data. (Enter the host star name in the Explore the Archive search box on our home page or the Advanced Search page and click Search.)

We have a winner!

Congratulations to citizen scientist Andreas Eloy Martinez Rojas (@eloycam2012) for winning the first round of #Exoplanets2018 ! He submitted a guess on what the total number of confirmed planets will be in the NASA Exoplanet Archive by the end of 2018 and won the random drawing for all submissions. If you sent us a guess before the Jan. 11 deadline, you are still in the running for the year-end prize! Now let's go find some exoplanets!

API Update: Blend Flags Removed

The maintenance of the blend flags has been discontinued, so the flag parameters have been removed from the Confirmed Planets (exoplanets), Extended Planet Data (exomultpars) and Mission Stellar (missionstars) tables. Please update your API queries as needed.

Deprecated Confirmed Planet (exoplanet) Flag Parameters: st_plxblend, st_optmagblend, st_teffblend, st_massblend, st_radblend, st_plxblend, st_pmrablend, st_pmdecblend, st_pmerrblend, st_radvblend, st_spstrblend, st_loggblend, st_lumblend, st_metfeblend, st_ageblend, st_vsiniblend, st_actsblend, st_actrblend, st_actlxblend, st_ujblend, st_vjblend, st_bjblend, st_rcblend, st_icblend, st_jblend, st_hblend, st_klbend, st_wise1blend, st_wise2blend, st_wise3blend, st_wise4blend, st_irac1blend, st_irac2blend, st_irac3blend, st_irac4blend, st_mips1blend, st_mips2blend, st_mips3blend, st_iras1blend, st_iras2blend, st_iras3blend, st_iras4blend, st_umbjblend, st_bmvjblend, st_vjmicblend, st_vjmicblend, st_vjmrcblend, st_jmhh2blend, st_hmk2blend, st_jmk2blend, st_bmyblend, st_m1blend, st_c1blend

Deprecated Extended Panet Data (exomultpars) Flag Parameters: mst_teffblend, mst_massblend, mst_radblend, mst_loggblend, mst_lumblend, mst_densblend, mst_metfeblend, mst_ageblend

Deprecated Mission Stellar (missionstars) Flag Parameters: st_j2mblend, st_h2mblend, st_ks2mblend, st_wise1blend, st_wise2blend, st_wise3blend, st_wise4blend

January 11, 2018

First Planetary System Discovered Entirely by Citizen Scientists!

NExScI researcher Dr. Jessie Christiansen led a group of astronomers from around the world and an army of 10,000 citizen scientists from Exoplanet Explorers, which was co-founded by Dr. Christiansen, in the discovery of K2-138, a five-planet system. The five planets are all super-Earths or mini-Neptunes that have orbital periods spanning 2 to 12 days.

This is the first multi-planet system to be discovered entirely by citizen scientists, the process of which is described in the Caltech press release. You can also read the Christiansen et al. 2018 discovery paper.

Data for K2-138 and its planets (b, c, d, e, and f) have been added to the archive. The archive has also added KELT-19 A b, a hot Jupiter orbiting an Am-star, which is the first detection of a planet orbiting these bizarre A-stars that have enhanced metals but are deficient in calcium. See the Confirmed Planets table for the planets' data.

Fun Fact: The K2-138 planets orbit in an interesting mathematical relationship called a resonance, in which each planet takes almost exactly 50 percent longer to orbit the star than the next planet further in. This is the longest system with a chain of unbroken resonances in this configuration, and may provide clues to theorists looking to unlock the mysteries of planet formation and migration.

January 5, 2018

Happy new year! We are back and ready to roll out new planets!

  1. Six Planets Added: To kick off 2018, we've got one planet discovered by radial velocity and five more by transit: HD 147379 b, K2-140 b, HATS-50 b, HATS-51 b, HATS-52 b, and HATS-53 b.

    The Confirmed Planet interactive table contains all of the archive's confirmed planet data, while this pre-filtered and pre-sorted table contains only the new planets and updated parameters for this week.

  2. Kepler Stellar Supplemental Data: The Kepler project delivered a Q1-Q17 DR 25 Kepler Stellar Supplemental data set containing corrected metallicities and the resulting derived stellar parameters for 779 stars that were incorrect in the original DR 25 table. This supplement can be accessed through the Kepler Stellar search interface, as well as our application programming interface (API).
  3. Announcing #Exoplanets2018! Here's your chance to predict the future and win prizes! We're having a contest where you can guess what the total confirmed planet count will be in the Exoplanet Archive at the end of 2018. Give us your best guess!

    The rules are:

    1. One entry per person, and only the first guess is accepted. Any follow-up or modified guesses are disqualified.
    2. Guesses must be submitted through social media with a retweet or share of the archive's original tweet/post and include the #exoplanets2018 hashtag. See our Social Media page to connect with us.
    3. Entries must be submitted by 5 p.m. PT/8 p.m. ET Thursday, Jan. 11, 2018.
    4. The winning guess will be as close to the correct number without exceeding it (think Price Is Right) as of midnight PT, Dec. 31, 2018.
    5. All participants will be entered in a random drawing on Friday, Jan. 12, 2018 for a small prize as a thank-you for entering. The winner(s) who guess correctly at the end of the year will be announced online and at the 2019 AAS meeting (and will also receive a prize).
    6. If you're going to be at #AAS231 next week, stop by the NExScI booth for hints!