P1252109266oSmew

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US NATIONAL VIRTUAL OBSERVATORY
TimeServer
Andrew Drake Robyn Allsman David Gasson Mark
Huber Kathy Vivas
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The Working Astronomers Motivation for a TD
Object Tool

• Optical Projects
• MACHO, EROS, OGLE, MOA, EROS
• SuperMacho, ESSENCE
• LONEOS, ROTSE
• FSVS, QUEST1, PQ, MEGACAM
• PANSTARRS, LSST
• Specific Source
• variable stars cluster studies
• radial velocity planet searches
• Pulsar studies
• HST, Chandra, EUVE...

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The Working Astronomers Motivation for a TD
Object Tool

• Science Goals
• Microlensing
• Planet Searches
• Quasar Variability
• Variable Star Zoo

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Time Server

• The goal
• Provide VO-enabled access to time-domain data
• Why?
• In anticipation of the upcoming TD surveys
• Provide uniform access to precursor TD datasets
• Foster tool development oriented on TD datasets
• How?
• Develop
• A registry of time-domain datasets
• A generic interface for TD data extraction
• A client enabling
• Registry lookup of TD datasets meeting specified
  criterion
• Retrieval of TD datasets meeting those criterion
• Display/Save/Analysis of those TD dataset

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The Future
T.D. Registry Service
TD Object DataScope
ADQL Fronted TD Database Servers
T.D. Object Extractor Service
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Current Reality
Favorite DB TD Extractor
T.D. Registry Service
Quest RR Lyrae TD Extractor Service
FetchEm
T.D. Object Extractor Service
MACHO TD Extractor Service
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Reality of Current Database Configurations

• Fully ADQL enabled
• Quest RR Lyrae dataset
• Partially ADQL enabled
• Macho
• ADQL enabled for variable star cone search
• REST/http for lightcurve retrieval
• http/GET enabled
• NSVS/ROTSE
• OGLE
• AAVSO
• Quest1

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Fully ADQL-enabled TD Extractor

• One stop shopping
• . Generally a TD dataset contains at least two
  tables
• Overarching info on each star (ra/dec/starId/)
• Measurements for each Observation in T.D. series
• A single query should suffice to extract the T.D
  data
• Select o. from Gentable g, Obstable o
• Where point(g.ra, g.dec)
• within region(ltragt,ltdecgt,ltradius
  gt)
• and o.starId g.starId
• and ltstarttimegt lt o.time lt ltendtimegt
• Maybe dont know if ADQL syntax supports
  this.

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Partially ADQL-enabled TD Extractor for MACHO
TD dataset

• MACHO TD Server
• integrates VO/non-VO enabled servers
• to retrieve TD lightcurves based on constraints
• The Macho Variable Star catalog is now
  ADQL-enabled via SkyNodeSoap service
• Cone search on ra/dec constraints provides
  lookup key for TD series retrieval
• Lightcurve retrieval is http/GET accessible
• Responses must be
• scrubbed to extract relevant data
• reformatted into VOTable for return

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Near Term Direction

• Use the SSAP time domain definition for VO object
  construction
• Contact other TD providers to gauge their
  interest in VO-enabling their data
• Wrap other TD http/GET datasets as desired
• Build the generic TD Object server
• Build a simple client for TD Object retrieval
• Morph that into a TD Datascope

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