ULLYSES

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 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 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 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 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.

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?

LMC Targets | SMC Targets | NGC 3109 | Classical T Tauri Monitoring | Chamaeleon I Cloud | Eta Chamaeleontis Cluster | Eps Chamaeleontis Cluster | Lupus Clouds | Taurus-Auriga Association | Orion OB1 Association | σ Orionis Cluster

LMC Targets 

SMC Targets 

NGC 3109 

Classical T Tauri Monitoring Stars 

Chamaeleon I Cloud 

Eta Chamaeleontis Association 

Eps Chamaeleontis Cluster 

Lupus Clouds 

Taurus-Auriga Association 

Orion OB1 Association 

σ Orionis Cluster