NASA Exoplanet Archive (astroquery.ipac.nexsci.nasa_exoplanet_archive)

This module can be used to query the NASA Exoplanet Archive via the TAP service or the API. A full discussion of the available tables and query syntax through the two interfaces is available at 1 and 2. More information about the development of a more integrated NASA Exoplanet Archive and ongoing transition to fully TAP supported services can be found at 3.

NOTE: the exoplanet and exomultpars tables are no longer available and have been replaced by the Planetary Systems table (ps). Likewise, the compositepars table has been replaced by the Planetary Systems Composite Parameters table (pscomppars). Both the ps and pscomppars tables are accessible through the Exoplanet Archive TAP service. Database column names have changed; this document contains the current definitions and a mapping between the new and deprecated names.

Query methods

The query_object method can be used to query for a specific planet or planet host. For example, the following query searches the ps table of confirmed exoplanets for information about the planet K2-18 b.

>>> from astroquery.ipac.nexsci.nasa_exoplanet_archive import NasaExoplanetArchive
>>> NasaExoplanetArchive.query_object("K2-18 b")
<QTable masked=True length=11>
pl_name pl_letter hostname ... sy_kmagerr1 sy_kmagerr2      sky_coord
                           ...                               deg,deg
  str7     str1     str5   ...   float64     float64          object
------- --------- -------- ... ----------- ----------- --------------------
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315
K2-18 b         b    K2-18 ...       0.019      -0.019 172.560141,7.5878315

Similarly, cone searches can be executed using the query_region method:

>>> import astropy.units as u
>>> from astropy.coordinates import SkyCoord
>>> from astroquery.ipac.nexsci.nasa_exoplanet_archive import NasaExoplanetArchive
>>> NasaExoplanetArchive.query_region(
...     table="pscomppars", coordinates=SkyCoord(ra=172.56 * u.deg, dec=7.59 * u.deg),
...     radius=1.0 * u.deg)
<QTable masked=True length=2>
pl_name pl_letter hostname ...   htm20         sky_coord
                           ...                  deg,deg
  str7     str1     str5   ...   int32           object
------- --------- -------- ... ---------- --------------------
K2-18 b         b    K2-18 ... -244884223 172.560141,7.5878315
K2-18 c         c    K2-18 ... -244884223 172.560141,7.5878315

The most general queries can be performed using the query_criteria method. For example, a full table can be queried as follows:

>>> from astroquery.ipac.nexsci.nasa_exoplanet_archive import NasaExoplanetArchive
>>> NasaExoplanetArchive.query_criteria(table="cumulative", select="*")
<QTable masked=True length=9564>
 kepid   kepoi_name kepler_name  ... koi_fittype koi_score      sky_coord
                                 ...                             deg,deg
 int64      str9       str14     ...     str7     float64         object
-------- ---------- ------------ ... ----------- --------- -------------------
10797460  K00752.01 Kepler-227 b ...     LS+MCMC       1.0 291.93423,48.141651
10797460  K00752.02 Kepler-227 c ...     LS+MCMC     0.969 291.93423,48.141651
10811496  K00753.01              ...     LS+MCMC       0.0 297.00482,48.134129
10848459  K00754.01              ...     LS+MCMC       0.0  285.53461,48.28521
10854555  K00755.01 Kepler-664 b ...     LS+MCMC       1.0   288.75488,48.2262
     ...        ...          ... ...         ...       ...                 ...
10155286  K07988.01              ...     LS+MCMC     0.092 296.76288,47.145142
10156110  K07989.01              ...     LS+MCMC       0.0 297.00977,47.121021

Example queries

Specific searches can be executed using the where, select, order, and other parameters as described in the documentation 1, 2.

In this section, we demonstrate

  1. The number of confirmed planets discovered by TESS:

>>> from astroquery.ipac.nexsci.nasa_exoplanet_archive import NasaExoplanetArchive
>>> NasaExoplanetArchive.query_criteria(table="pscomppars", select="count(*)",
...                                     where="disc_facility like '%TESS%'")  
<QTable masked=True length=1>
count(*)
 int32
--------
     131
  1. The list of 10 confirmed planets discovered by TESS and their host star coordinates:

>>> from astroquery.ipac.nexsci.nasa_exoplanet_archive import NasaExoplanetArchive
>>> NasaExoplanetArchive.query_criteria(table="pscomppars", select="top 10 pl_name,ra,dec",
...                                     where="disc_facility like '%TESS%'")
<QTable masked=True length=10>
   pl_name         ra         dec            sky_coord
                  deg         deg             deg,deg
    str13       float64     float64            object
------------- ----------- ----------- -----------------------
WD 1856+534 b  284.415675  53.5090244   284.415675,53.5090244
   TOI-1201 b  42.2476999 -14.5372835  42.2476999,-14.5372835
  HD 213885 b 338.9837166  -59.864829  338.9837166,-59.864829
  HD 219666 b 349.5592665 -56.9039857 349.5592665,-56.9039857
          ...         ...         ...                     ...
  1. The list of confirmed planets discovered using microlensing that have data available in the archive:

>>> from astroquery.ipac.nexsci.nasa_exoplanet_archive import NasaExoplanetArchive
>>> NasaExoplanetArchive.query_criteria(
...     table="pscomppars", where="discoverymethod like 'Microlensing'")  
<QTable masked=True length=108>
       pl_name        pl_letter ...    htm20           sky_coord
                                ...                     deg,deg
        str24            str1   ...    int32             object
--------------------- --------- ... ----------- -----------------------
OGLE-2016-BLG-1227L b         b ...  -768415656  265.597125,-33.7597778
OGLE-2015-BLG-0966L b         b ...  2084638177   268.75425,-29.0471111
OGLE-2017-BLG-0173L b         b ...  1462336374  267.970612,-29.2713604
OGLE-2017-BLG-1140L b         b ...  -925663673  266.883057,-24.5226669
                  ...       ... ...         ...                     ...
OGLE-2012-BLG-0358L b         b ...  2111594269      265.694875,-24.261
OGLE-2017-BLG-0482L b         b ...  -287458961  269.048889,-30.5283604
  MOA-2010-BLG-353L b         b ... -1953724135  271.303917,-27.2932333
OGLE-2014-BLG-1722L c         c ...   361334854   268.75238,-31.4690552
  1. The list of confirmed planets where the host star name starts with “Kepler” using a wildcard search:

>>> from astroquery.ipac.nexsci.nasa_exoplanet_archive import NasaExoplanetArchive
>>> NasaExoplanetArchive.query_criteria(
...     table="pscomppars", where="hostname like 'Kepler%'", order="hostname")
<QTable masked=True length=2370>
   pl_name    pl_letter   hostname  ...    htm20          sky_coord
                                    ...                    deg,deg
    str14        str1      str12    ...    int32            object
------------- --------- ----------- ... ----------- ----------------------
  Kepler-10 c         c   Kepler-10 ...   512815427  285.679298,50.2414842
  Kepler-10 b         b   Kepler-10 ...   512815427  285.679298,50.2414842
 Kepler-100 b         b  Kepler-100 ...  -383871624 291.3861294,41.9901394
 Kepler-100 d         d  Kepler-100 ...  -383871624 291.3861294,41.9901394
 Kepler-100 c         c  Kepler-100 ...  -383871624 291.3861294,41.9901394
Kepler-1000 b         b Kepler-1000 ... -1745355506 286.6854729,47.0981948
          ...       ...         ... ...         ...                    ...
 Kepler-995 b         b  Kepler-995 ...  -369943676  284.6157154,39.130998
 Kepler-996 b         b  Kepler-996 ...  -288530943 291.9127633,41.5335891
 Kepler-997 b         b  Kepler-997 ...   604179197 289.2333767,49.9388952
 Kepler-998 b         b  Kepler-998 ...  1883599570 296.7541629,49.2087085
 Kepler-999 b         b  Kepler-999 ... -1948748132 299.6604865,46.1984679
  1. The Kepler Objects of Interest that were vetted more recently than January 24, 2015 using a date search:

>>> from astroquery.ipac.nexsci.nasa_exoplanet_archive import NasaExoplanetArchive
>>> NasaExoplanetArchive.query_criteria(
...     table="koi", where="koi_vet_date>to_date('2015-01-24','yyyy-mm-dd')",
...     select="kepoi_name,koi_vet_date", order="koi_vet_date")
<QTable length=34652>
kepoi_name koi_vet_date
   str9       str10
---------- ------------
 K00866.01   2015-09-24
 K00867.01   2015-09-24
 K00124.01   2015-09-24
       ...          ...
 K06823.01   2018-08-16
 K06824.01   2018-08-16
 K06825.01   2018-08-16

References

1(1,2)

NASA Exoplanet Archive TAP Documentation

2(1,2)

NASA Exoplanet Archive API Documentation

3

Developing a More Integrated NASA Exoplanet Archive

Reference/API

astroquery.ipac.nexsci.nasa_exoplanet_archive Package

NASA Exoplanet Archive Query Tool

Module to query the NASA Exoplanet Archive via the API.

Classes

NasaExoplanetArchiveClass()

The interface for querying the NASA Exoplanet Archive TAP and API services

Conf()

Configuration parameters for astroquery.ipac.nexsci.nasa_exoplanet_archive.