ULLYSES T TAURI

T Tauri Stars in Galactic Star-Forming Regions

Observations of the ULLYSES low-mass T Tauri star survey sample (listed in the eight tables for different regions) will be obtained with COS/G130M/1291, COS/G160M/1611, STIS/G230L, STIS/G430L, and STIS/G750L. The four stars in the monitoring sample (listed in the final table) will be observed with COS/G160M/1611 and COS/G230L/(2635,2950). The monitoring stars will be observed a total of 24 times each. These observations will be taken in two epochs, separated by several months. There will be four observations per rotation period, and three rotation periods in each epoch. All of the HST data for the low-mass stars will be obtained during HST cycles 28 and 29 (2020-2022). Community groups are planning to obtain the following complementary ground- and/or space-based data: photometry covering the time around the HST observations (for the full sample), spectroscopy from X-ray to mid-IR wavelengths, and spectro-polarimetry (for the four temporally monitored stars).

For each region, the tables give the generally agreed-upon target name; the target names as they appear in the MAST archive, with the name adopted by the ULLYSES team in bold; the stellar position (generally from Gaia DR2 or 2MASS); the adopted spectral type; the stellar mass and accretion rate; and the visual extinction and V magnitude. For the targets to be monitored, the table gives the star name; the position; the stellar mass, radius, accretion rate, and rotational period; and the visual extinction. In each table, three additional columns will be populated (when the information exists), giving the proposal ID, the science configuration (indicating which instruments and channels will be used), the date of the first observation of that target, and the status of all observations for the target. Further information about each visit can be found by clicking on the row for the target of interest. An additional table will appear that will contain the visit ID, the scheduling status of that visit, a more detailed science configuration (including grating and central wavelength), and the observation date for each visit. Note that the target tables below include stars that were observed as part of archival GO-programs. Owing to the variability of T Tauri stars, all delivered HLSPs for “survey” T Tauri stars include only one epoch of observations. Therefore, HLSPs for stars observed with previous GO programs either include archival observations taken at the same epoch only, or ULLYSES observations only, but not both. Nevertheless, for stars that include both archival observations and observations taken as part of ULLYSES, we list all PIDs in the tables below (even though not all PIDs are included in the HLSPs).

The "Overall Status" column shows the current observational status of a target. Targets with complete wavelength coverage are marked as "Completed". Targets with partial wavelength coverage and/or with currently scheduled observations are marked as "In Progress". Targets with no wavelength coverage and no currently scheduled observations are marked as "Not Yet Implemented".

Chamaeleon I Cloud

Corona Australis Association

ε Chamaeleontis Association

η Chamaeleontis Cluster

Lupus Clouds

Orion OB1 Association

σ Orionis Cluster

Taurus-Auriga Association

TW Hydrae Association

Scorpius-Centaurus Association/Lower Centaurus-Crux Subgroup

Scorpius-Centaurus Association/Upper Scorpius Subgroup

Other Stars

Classical T Tauri Star Monitoring Targets