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VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 1 VOScript: VO Spectral analysis scripting tool ESA-VO Team Juan González Deborah Baines Isa Barbarisi.

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Presentation on theme: "VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 1 VOScript: VO Spectral analysis scripting tool ESA-VO Team Juan González Deborah Baines Isa Barbarisi."— Presentation transcript:

1 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 1 VOScript: VO Spectral analysis scripting tool ESA-VO Team Juan González Deborah Baines Isa Barbarisi Andrea Laruelo Science Arcives and VO Team (SAT) Computer Support Engineering Unit (SRE-OE) ESAC, Madrid VOScript

2 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 2 Motivation Project scope Architectural design Example science case Roadmap Presentation Overview

3 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 3 VOSCRIPT: Motivation VOScript is being developed as a direct response to the feedback from the astronomy community to VOSpec: How do I do … for 10^9 sources? - EURO-VO School, January (Multitargetting) Want to have the automatic retrieval of spectra from a list of objects – requested by a number of AIDA Research Initiative proposals. (Batch processing) Is there the ability of performing a fit (e.g. Gaussian) to a large number of spectra in one go? - EURO-VO School, April (Automated analysis) Can I broadcast a spectral list to Topcat? – EURO-VO School, April (Tables interaction)

4 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 4 VOSCRIPT: Scope To cover the use science cases reported, a wider approach was followed, taking more design considerations into account: Run everywhere: provide multi-platform, multi-language access interfacing. User access through several abstraction layers: From simple top-level usage to low-level data model tuning Fully extensible: Based on a very comprehensive data model for which capabilities can be extended directly by the user

5 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 5 Motivation Project scope Architectural design Example science case Roadmap Presentation Overview

6 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 6 VOSCRIPT: Architecture Run everywhere: Multi-platform, multi-language access interfacing: JVM language based scripting Data Access modules within VOSpec fully re-engineered to bring to the user a comprehensive object structure, that may be distributed as a single jar file accessed by object-based JVM scripting. Existing code in many general purpose programming languages may be reused in JVM-based equivalent languages, including Java, C, Python, Tcl, JavaScript, Pascal, PHP, Ruby, Ada, AWK, Cobol, ColdFusion, Common Lisp, Component Pascal, Erlang, Forth, LOGO, Lua, Oberon-2, Objective Caml, Rexx, Scheme…

7 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 7 VOSCRIPT: Architecture

8 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 8 VOSCRIPT: Architecture Run everywhere: Multi-platform, multi-language access interfacing: Shell access Shell access module comes bundled, based on org.apache.commons.cli Provides access from any shell command interpreter in any OS that may run Java: bash, csh, tcsh, etc. Flexibility and customization capabilities quite reduced compared to JVM languages access. Only recommended for fast access to basic functionality.

9 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 9 VOSCRIPT: Architecture Abstraction levels: documentation to be provided covering different layers of the application Simple high-level access described module by module, by UML diagrams and simple use cases Well documented Java API for further low-level access, including for instance a new Spectral DM parser (Legacy formats to custom SDM with few lines of code)

10 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 10 Motivation Project scope Architectural design Example science case Roadmap Presentation Overview

11 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 11 VOSCRIPT SCIENCE CASE AIM: Search the VO for specific IR lines for a large list of young stars, calculate the equivalent widths of the lines, save the results as a table and produce plots. Using VOScript: Searched the VO for ISO spectra for a list of ~320 Herbig Ae/Be stars. Calculated the Equivalent Widths of some strong spectroscopic lines in the IR, e.g. [OI] 63um, [CII] 158µm, PAH lines…. Output is a table which can be loaded into TOPCAT. Using TOPCAT (or STILTS): Cross matched the VOScript results table with catalogues in the VO for photometry, stellar parameters, etc - e.g. Garcia Lopez et al 2006: accretion luminosities, mass luminosities and Bracket gamma EWs for Herbig Ae/Be stars. Produced histograms and scatter plots to compare spectroscopic lines and look for any trends.

12 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 12 VOSCRIPT SCIENCE CASE Import libraries Load list of targets Set the logging information Add more sources to target list Create output table and list of spectra Define SSA services to be queried

13 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 13 VOSCRIPT SCIENCE CASE Download each spectrum and save locally EW calculation Query SSA services with target list and search radius = 0.05 degrees Cut each spectrum centered on line of interest Save results into a table, as CSV, VOTABLE etc Add metadata and fitting to output table

14 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 14 VOSCRIPT INITIAL RESULTS: IR LINES Only observe [OI] 63µm emission from sources with large flared disks (blue), as identified by their SED in the IR. (Red = all sources).

15 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 15 VOSCRIPT INITIAL RESULTS: IR LINES [CII]158µm appears stronger in sources with self-shadowed disks (green) than with flared disks (blue). (Red = all sources). Surprise result. Although Pinte et. al. (2010) disk models do show that the line originates from larger radii and lower density regions than the [OI] IR lines, and it is very sensitive to the amount of UV radiation.

16 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 16 VOSCRIPT INITIAL RESULTS: IR LINES PAH 6.2µm stronger in sources with flared disks (blue) than self- shadowed disks (green) - agrees with Acke and van den Ancker, 2004, A&A, 426, 151. (Red = all sources).

17 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 17 Motivation Project scope Architectural design Example science case Roadmap Presentation Overview

18 VOScript | ESA-VO Team | INTEROP 2010, Nara | Pag. 18 VOSCRIPT: Roadmap Call for BETA testers: VOScript still in internal stage. Willing to provide early test releases for interested parties, along with script examples and documentation adapted to the case. Send us your science case to


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