V2: updated ACQ times for Visits 1-4, removed note text that said "2% limitation on emission line lifetimes." this was a typo.
1340631533
----- Attempting Submission 1 (Mon Jul 06 19:08:15 GMT 2026) -----
Your proposal could not be saved.
Submission aborted.
----- Attempting Submission 2 (Thu Jul 09 20:28:18 GMT 2026) -----
N/A
Rocky Worlds DDT: HST Observations of TOI-198
Rocky Worlds is a joint JWST and HST Director's Discretionary Program designed to implement the top recommendations from the Working Group on Strategic Exoplanet Initiatives with HST and JWST. The HST side of the Rocky Worlds DDT focuses on ultraviolet (UV) characterization of the nearby M-dwarf hosts of the rocky planets observed with JWST. We will use COS and STIS to measure the UV to blue-optical spectra of these stars, including UV flare monitoring and measuring the wings of the Ly-alpha profile where appropriate. With these observations we will constrain the high-energy output of these host M dwarfs in the UV, which can be applied to planetary models of atmospheric escape, as well as photochemistry if a planetary atmosphere is present. Complementary observations and analysis to fill in the rest of the M-dwarf panchromatic spectra, from the X-ray to the infrared, are encouraged.
Each M-dwarf planet host observed by HST in the Rocky Worlds DDT program has its own Program ID. The observations in this program will focus on TOI-198.
HST observations of TOI-198. 12 orbits of flare monitoring using G130M/1222.We also obtain 4 orbits of G160M/1533 observations for coverage of important UV emission lines. We obtain NUV/Vis low resolution spectroscopy with STIS G230L, G430L, and G750L and the 52x0.2 slit in order to construct an accurate stellar SED and leverage the Mg II 2800 emission lines to tie to archival observations. Finally, we obtain G140M/1222 observations at the 52x0.2D1 slit position for Lyman alpha. All UV observations are obtained in time-tag mode to allow for light curves to be generated in the case of a flare or serendipitous transit.
These observations mimic characterization of other M dwarfs from previous programs.
0
false
false
SUPPORTED
STAR
EXTRA-SOLAR PLANETARY SYSTEM
M V-IV
NO
Gaia DR3 coordinates double checked 06/25/2026
Fluxes double checked 06/25/2026
LHS-1026
J2000
G =10.91
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The predicted brightness of CIV and Si IV are high enough to be a problem for flare conditions. We will put this visit on hold until we can observe Lyman alpha or other metal lines for this system. Once we have an observed value for this system we can re-do the flare clearance for this mode.
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