SVO archive of ultracool dwarfs identified in J-PLUS DR2

Documentation

Web access

The archive system implements a very simple search interface that permits queries by coordinates/radius and or range (*) of magnitudes. 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. Results can be sorted by just clicking on 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 by just clicking the "Send table to VO Apps" button.

(*) 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.

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.

Frequently Asked Questions

How to make a query by magnitudes?

Click on "Clean".
Fill in the appropriate boxes in the "additional search fields".
Mark the "Don't use coordinates as search criterion" checkbox if you don't want to restrict by coordinates (or uncheck it otherwise).
Click on "Search"

Parameters contained in the detection catalogue

Parameter	Units	Description
RA (J2000)	deg	Right ascension (J2000)
DEC (J2000)	deg	Declination (J2000)
source_id	-	Identifier of the nearest Gaia EDR3 counterpart found in a 3 arcsec radius
Parallax	mas	Gaia EDR3 parallax
Parallax_error	mas	Gaia EDR3 parallax error
pmRA	mas/yr	Gaia EDR3 proper motion in right ascension direction (pmRA*cosDE)
pmRA_error	mas/yr	Gaia EDR3 error for the proper motion in right ascension direction
pmDEC	mas/yr	Gaia EDR3 proper motion in declination direction
pmDEC_error	mas/yr	Gaia EDR3 error for the proper motion in declination direction
pm	mas/yr	Gaia EDR3 total proper motion
RUWE	-	Gaia EDR3 renormalised unit weight error parameter
Gmag	mag	Gaia EDR3 G-band mean magnitude (Vega)
RPmag	mag	Gaia EDR3 RP-band mean magnitude (Vega)
rmag	mag	J-PLUS r magnitude
zmag	mag	J-PLUS z magnitude
Method	-	Methodology/ies that identified the candidate UCD. “diag” label represents photometry-based selection, while “par” and “pm” labels represent selections based on parallax and proper motion, respectively. The “all” label comprises the candidate UCDs identified with the 3 approaches.
Teff_VOSA	K	Effective temperature estimated using VOSA
reported_UCD	-	Flag indicating if the candidate was already reported as UCD (1) or not (0). If the candidate appears in Simbad with spectral type equal or later than M7, but lacks the luminosity class, it is considered as not reported (see the sample described in Section 5 of Mas-Buitrago et al. (2022)).
SpTy_simbad	-	Spectral type given in Simbad. "BD?" Simbad label is included for BD candidates with no Spectral type.
SpTy_ahmed	-	Photo-type classification in the Ahmed catalogue
SpTy_panstarrs	-	Spectral type adopted in the Best et al. (2018) catalogue
SpTy_reyle	-	Indicative spectral type computed in the Reyle (2018) catalogue
SpTy_smart	-	Spectral type given in the Smart et al. (2017) catalogue
SpTy_zhang2009	-	Spectral type derived in Zhang et al. (2009)
SpTy_zhang2010	-	Spectral type given in Zhang et al. (2010)
SpTy_schmidt	-	Spectral type given in Schmidt et al. (2010)
SpTy_skrzypek	-	Photo-type classification from Skrzypek et al. (2016)