The SVO-JPLUS archive of ultracool dwarfs

Documentation

The archive system implements a very simple search interface that permits queries by coordinates/radius and/or range^(*) of magnitudes, colors and effective temperatures. The default search radius is set to 5 arcsec. The user can also select the maximum number of sources to return (with values ranging from 10 to unlimited).

The result of the query is a HTML table with all the sources found in the archive fulfilling the search criteria. Detailed information on the output fields can be obtained placing the mouse over the question mark ("?") located close to the name of the column.

The archive implements the SAMP (Simple Application Messaging Protocol). SAMP allows applications to communicate with each other in a seamless and transparent way for the user. This way, the results of a query can be easily transferred to other VO applications, such as, for instance, Topcat.

Virtual Observatory access

The Virtual Observatory (VO) is an international initiative whose primary goal is to provide an efficient access and analysis of the information hosted in astronomical archives and services. Having a VO-compliant archive is an important added value for an astronomical project to guarantee the optimum scientific exploitation of their datasets.

Our archive system has been designed following the IVOA standards and requirements. In particular, it implements the Cone Search protocol, a standard defined for retrieving records from a catalogue of astronomical sources. The query made through the Cone Search service describes a sky position and an angular distance, defining a cone on the sky. The response returns a list of astronomical sources from the catalogue whose positions lie within the cone, formatted as a VOTable.

Catalogue columns

Field	Description	Unit	UCD	Verbosity
RA (ICRS)	Right Ascension (ICRS) (degrees)	deg	POS_EQ_RA_MAIN	Minimum
DEC (ICRS)	Declination (ICRS) (degrees)	deg	POS_EQ_DEC_MAIN	Minimum
i_JPLUS	JPLUS i magnitude	mag	phot.mag	Minimum
z_JPLUS	JPLUS z	mag	phot.mag	Minimum
Teff	Effective temperature estimated using VOSA	K	phys.temperature.effective	Minimum
Av	Extinction estimated using VOSA.	mag	phys.absorption	Minimum
Radius	Stellar radius estimated from L = 4 pi r^2 sigma Teff^4, where Teff and L have been calculated using VOSA and Gaia DR2 parallaxes.	Rsun	phys.size.radius	Minimum
eRadius	Stellar radius uncertainty	Rsun	stat.error;phys.size.radius	Minimum
SDSS12	SDSS DR12 identifier			Maximum
RA_SDSS	SDSS DR12 RA	deg		Maximum
DEC_SDSS	SDSS DR12 DEC	deg		Maximum
umag	SDSS DR12 umag magnitude	mag	phot.mag	Maximum
e_umag	SDSS DR12 umag magnitude uncertainty	mag	stat.error;phot.mag	Maximum
gmag	SDSS DR12 gmag magnitude	mag	phot.mag	Maximum
e_gmag	SDSS DR12 gmag magnitude uncertainty	mag	stat.error;phot.mag	Maximum
rmag	SDSS DR12 rmag magnitude	mag	phot.mag	Maximum
e_rmag	SDSS DR12 rmag magnitude uncertainty	mag	stat.error;phot.mag	Maximum
imag	SDSS DR12 imag magnitude	mag	phot.mag	Maximum
e_imag	SDSS DR12 imag magnitude uncertainty	mag	stat.error;phot.mag	Maximum
zmag	SDSS DR12 zmag magnitude	mag	phot.mag	Maximum
e_zmag	SDSS DR12 zmag magnitude uncertainty	mag	stat.error;phot.mag	Maximum
DR2Name	Gaia DR2 identifier			Default
RA_GaiaDR2	Gaia DR2 RA	deg		Default
DE_GaiaDR2	Gaia DR2 DEC	deg		Default
Gmag	Gaia DR2 G magnitude	mag	phot.mag	Default
e_Gmag	Gaia DR2 G magnitude uncertainty	mag	stat.error;phot.mag	Default
Plx	Gaia DR2 parallax			Default
e_Plx	Gaia DR2 parallax uncertainty			Default
pmRA	Gaia DR2 pmRA			Default
e_pmRA	Gaia DR2 pmRA uncertainty			Default
pmDE	Gaia DR2 pmDE			Default
e_pmDE	Gaia DR2 pmDE uncertainty			Default
Vtan	Tangential velocity (v: 4.74 mu d) where mu, d were estimated using Gaia DR2 data.		phys.veloc.transverse	Default
BPmag	Gaia DR2 BP magnitude	mag	phot.mag	Default
e_BPmag	Gaia DR2 BP magnitude uncertainty	mag	stat.error;phot.mag	Default
RPmag	Gaia DR2 RP magnitude	mag	phot.mag	Default
e_RPmag	Gaia DR2 RP magnitude uncertainty	mag	stat.error;phot.mag	Default
2MASS	2MASS identifier			Maximum
RA_2MASS	2MASS RA	deg		Maximum
DE_2MASS	2MASS DEC	deg		Maximum
Jmag	2MASS Jmag	mag	phot.mag	Maximum
e_Jmag	2MASS Jmag uncertainty	mag	stat.error;phot.mag	Maximum
Hmag	2MASS Hmag	mag	phot.mag	Maximum
e_Hmag	2MASS Hmag uncertainty	mag	stat.error;phot.mag	Maximum
Ksmag	2MASS Kmag	mag	phot.mag	Maximum
e_Ksmag	2MASS Jmag uncertainty	mag	stat.error;phot.mag	Maximum
Qfl_2MASS	2MASS Quality flags			Maximum

(*) When a range is specified in a search the user must give both a minimum and maximum value for the corresponding quantity. If only a minimum value is given, all results with values larger than that will be obtained. If only a maximum value is given, all results with values smaller than that will be obtained.