February 26, 2024
COS NEWSLETTERS

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In this STAN we announce the delivery of the Hubble Advanced Spectral Products (HASP) program.

HASP: Unlocking the full potential of Hubble's spectral data

The logo for the Hubble Advanced Spectral Product Archive (HASP)

The Hubble Advanced Spectral Products (HASP) program is set to transform the way the MAST community accesses and utilizes Hubble Space Telescope (HST) spectroscopic data. HASP offers an innovative and automated approach to coadding and combining data to obtain high-quality one-dimensional spectra from HST's Cosmic Origins Spectrograph (COS) and Space Telescope Imaging Spectrograph (STIS). Products are automatically updated when new data come in or new calibrations are made available, ensuring users always have access to the latest insights.

HASP's mission is clear: simplify and enhance access to HST spectroscopic data. By default, HST data often require users to manually coadd spectra for scientific analysis. HASP generates two crucial data products: coadds and abutments, created at both the visit and program levels. Coadded spectra result from combining data from a common grating, while abutments involve merging spectra from different gratings and/or instruments (Figure 1). 

The two key techniques from the Hubble Advanced Spectral Products for a white dwarf star, WD 0308-565
Figure 1: The two key techniques from the Hubble Advanced Spectral Products for a white dwarf star, WD 0308-565. On the left, we see combined data from multiple CENWAVES using the G160M grating, detailing the coadded spectrum, exposure times, and signal-to-noise ratios. The right shows data from three different gratings abutted together, highlighting the smoothness of the compiled spectrum and the corresponding exposure and signal quality metrics. This visual comparison showcases HASP's ability to refine and enhance astronomical data.

HASP also provides users with tools to create custom coadds, granting unprecedented flexibility and control over the coaddition process. This versatility is accessible through user-friendly Jupyter Notebooks, designed to assist users in setting up and running the coadd script, catering to specific use cases not covered by automatic coadds (Figure 2).

Users can explore interactive HASP Jupyter Notebooks that provide a step-by-step guides on creating custom coadded/abutted datasets
Figure 2:  The HASP website has links, shown above, to interactive Jupyter notebooks that provide step-by-step guides on creating custom coadded/abutted datasets, enabling users to tailor spectral data combination to fit their unique research needs.

HASP is now seamlessly integrated into the Hubble MAST search form (Figure 3) as a standard component of data downloads from the archive. Users looking for HASP data can access them through new cspec.fits files, which have become a default MAST product.

A snapshot from the Hubble MAST search form showcasing the integration of HASP.
Figure 3: A snapshot from the Hubble MAST search form showcasing the integration of HASP. Each entry in the HASP column signifies the availability of HASP data, with '1' indicating presence and '0' for absence, guiding users to new cspec.fits (combined spectrum) data.

For comprehensive details, please refer to the HASP webpage or HASP Instrument Science Report.

 

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