Mission Overview
Hubble UV Legacy Library of Young Stars as Essential Standards ("ULLYSES")
Primary Investigator: Julia Roman-Duval
HLSP Authors: See complete list of HLSP authors.
Released: 2020-11-05
Updated: 2023-12-12
Primary Reference(s): Roman-Duval et al. 2020
Citations: See ADS Statistics
Source Data:
New Observations:
HST Proposals 16090, 16092, 16094, 16095, 16096
16097, 16098, 16099, 16100, 16101, 16102, 16103
Archival Observations (click "Expand All" to see):
Overview
The Hubble UV Legacy Library of Young Stars as Essential Standards ("ULLYSES") is a Director's Discretionary program devoting ~1,000 HST orbits to the production of an ultraviolet spectroscopic library of young high- and low-mass stars in the local universe. The ULLYSES program uniformly samples the fundamental astrophysical parameter space for each mass regime -- including spectral type, luminosity class, and metallicity for massive OB stars (in the Magellanic Clouds and two other lower-metallicity nearby galaxies) and the mass, and disk accretion rate for low-mass T Tauri stars (in eight young Galactic star forming regions). The data will be gathered over a three-year period, from Cycle 27 through Cycle 29 (2020-2022). The data products are combined from individual, extracted and calibrated spectra obtained HST/COS, HST/STIS, and FUSE. Both archival HST and new HST observations obtained through the ULLYSES program are used. Additional products are created using ground-based LCOGT observations.
In addition to the MAST HLSP webpage here, you can read more about ULLYSES on their team page: https://ullyses.stsci.edu/index.html. You can find out detailed information on the observations, the data processing, and access their spectral table.
Data Release 7 (12 Dec. 2023)
ULLYSES Data Release 7 (DR7) consists of new high-level science products (HLSPs) for 97 ULLYSES stars observed since DR6 (March 2023) and updated HLSPs for 398 stars included in all previous releases, for a total of 495 ULLYSES stars in the final sample. Updated HLSPs from previous DRs incorporate ULLYSES algorithm updates as well as COS and STIS pipeline and calibration improvements. HLSPs from previous DRs should be replaced with newly downloaded products that incorporate these upgrades.
Data Release 6 (21 Mar. 2023)
ULLYSES Data Release 6 (DR6) consists of high-level science products (HLSPs) for 59 new ULLYSES targets and updated HLSPs for 339 targets previously released in previous DRs, for a total of 398 ULLYSES targets to date. Products are also provided for 9 companion targets present in STIS long-slit observations. DR6 includes improved FUSE spectra, additional timeseries spectra, the final epochs of monitoring T Tauri stars, and new massive stars in low-metallicity galaxies. More details can be found in the ULLYSES Data Release 6 page.
Data Release 5b (15 Nov. 2022)
ULLYSES Data Release 5b (DR5b) consists of high-level science products (HLSPs) for 17 new ULLYSES low-mass targets. Data releases typically include reprocessed HLSPs from previous releases, but DR5b is limited to only new products for these 17 T Tauri stars. In addition, a new MAST search form that provides ULLYSES data, stellar parameters, and observational information is now available. This new search form will be the main platform to query and download ULLYSES data going forward.
Data Release 5 (28 June 2022)
ULLYSES Data Release 5 (DR5) consists of high-level science products (HLSPs) for 75 new ULLYSES targets and updated HLSPs for 250 targets previously released in DRs 1-4, for a total of 325 ULLYSES targets to date. Products are also provided for 9 companion targets present in STIS long-slit observations. The HLSP creation code is now available to the public. More details can be found in the ULLYSES Data Release 5 page.
Data Release 4 (14 Dec 2021)
ULLYSES Data Release 4 (DR4) consists of high-level science products (HLSPs) for 25 new ULLYSES targets and updated HLSPs for 226 targets previously released in DRs 1-3, for a total of 251 ULLYSES targets to date. Products are also provided for 8 companion targets present in STIS long-slit observations. More details can be found in the ULLYSES Data Release 4 page.
Data Release 3 (31 Aug. 2021)
Data Release 3 (DR3) consists of high-level science products (HLSPs) for 90 new ULLYSES targets and updated products for 137 targets previously released in DRs 1 and 2, for a total of 227 ULLYSES targets to date. HLSPs are also provided for six companion targets present in STIS long-slit observations. DR3 includes two new product types – time-series spectra and WFC3 drizzled images – and introduces LCOGT (Las Cumbres Observatory Global Telescope) data for an initial subset of ULLYSES T Tauri stars.
Data Release 2 (17 Mar. 2021)
The second ULLYSES data release consists of coadded and abutted high-level science products for 24 new ULLYSES targets in addition to updated HLSPs for 115 targets previously released in DR1 for a total of 139 ULLYSES targets. 126 targets are massive stars and 13 are T Tauri stars. An additional 5 non-ULLYSES targets are included as well, detailed on the ULLYSES Data Release 2 page.
Data Release 1 (05 Nov. 2020)
The first data release consists of multiple spectra for 115 massive stars in the Large and Small Magellanic Clouds. 43 of these 115 stars were recently observed with COS and STIS as part of the ULLYSES program; 8 of these 43 also have archival COS and STIS data. The remaining 72 targets have full UV coverage from archival programs (see the ULLYSES target lists for the LMC and SMC).
Data Products
For a full description of how the HLSPs were created, please see the Data Description page on the ULLYSES website.
The spectra have the following file naming convention:
hlsp_ullyses_<telescope>_<instrument>_<target>_<opt_elem>_<version>_<product-type>
where:
- <telescope> = one or more values representing the telescope(s) used to create the spectrum, described more below
- <instrument> = one or more values representing the instrument(s) used to create the spectrum, described more below
- <target> = the name of a star in the ULLYSES program, all lowercase and no underscores allowed
- <opt-elem> = one or more optical elements representing the grism(s) used to create the spectrum, described more below
- <product-type> = the type of spectral product, described more in the table below
- <version> = the data release identifier, e.g., "dr1", "dr2", etc.
Additional Information On Data File Names and Types
| Description | Telescope | Instrument | Optical Element | Product Type | ULLYSES HLSP Level |
|---|---|---|---|---|---|
| Custom calibrated STIS 1D spectra. | hst | stis |
g230l g430l g750l |
spec.fits | 0 |
| STIS custom calibration parameter files. | hst | stis |
g230l g430l g750l |
spec.yaml | 0 |
| STIS echelle single grating, where the orders have been extracted and merged. | hst |
stis stis stis stis |
e140h e230h e140m e230m |
mspec.fits | 1 |
| Combined spectra, with common instrument and grating, and in some cases with different cenwave settings. | hst |
cos cos cos cos stis stis stis stis stis stis stis |
g130m g160m g185m g230l e140h e140m e230h e230m g230l g430l g750l |
cspec.fits | 2 |
| Combined spectra, with common instrument, different gratings and cenwave settings, and grouped by resolution. |
fuse fuse hst hst hst hst |
fuv fuv cos stis stis stis |
lwrs mdrs g130m-g160m-g185m e140h-e230h e140m-e230m g230l-g430l-g750l |
cspec.fits aspec.fits |
3 |
| All instruments and settings abutted together. |
hst hst hst-fuse |
cos-stis cos-stis fuse-cos-stis |
uv uv-opt uv-opt |
preview-spec.fits | 4 |
| Exposure-level time-series spectra. |
hst hst lcogt |
cos cos 04m |
g130m g160m v-ip |
tss.fits |
5 |
| Subexposure-level time-series spectra. |
hst hst |
cos cos |
g130m g160m |
split-tss.fits |
5 |
| WFC3 drizzled images. |
hst |
wfc3 wfc3 wfc3 wfc3 wfc3 |
f225w f275w f336w f475w f814w |
drc.fits | 6 |
Data file types:
| _aspec.fits | Spectra combined from multiple gratings or instruments. |
| _cspec.fits | Spectra combined from multiple gratings or instruments. |
| _mspec.fits | Spectra combined from multiple STIS echelle orders. |
| _preview-spec.fits | All instruments and settings abutted together. |
| _spec.fits | Custom calibrated STIS spectra. |
| _spec.yaml | STIS custom calibration parameter files. |
Data Access
ULLYSES products are available in the MAST Mission Search (mission-specific searches), the Portal (web-based, cross-mission search interface) and Astroquery (Python package to search for and download files from Python scripts you write). You can also access them through a spectral table available on the ULLYSES team webpage. We recommend most users start with the Mission Search Form through the browser or the programmatic access through its API and astroquery.mast.
-
A web-based interface for searching by mission-specific metadata. Also available through astroquery.mast.
-
A web-based interface for cross-mission searches of data at MAST or the Virtual Observatory.
-
Search for, and retrieve, ULLYSES data products programmatically based on a list of coordinates or target names.
Tips On Using Portal For ULLYSES Data
How Do I Select Only ULLYSES HLSP Files In The Portal (Before or After I Do A Search)?
How Do I See The Linked HST Datasets That Went Into Each HLSP Observation In My Basket?
Quick Links To Load All Targets Of A Given Category
LMC Targets
Load table of all LMC targets.
SMC Targets
Load table of all SMC targets.
Low Z
Load table of all low-metallicity targets.
T Tauri Stars
Load table of all T Tauri targets.