HST UV Spectroscopy of the Planet-Hosting T Tauri Star PDS 70
Stephen L. Skinner, Marc Audard

TL;DR
This study presents the first UV spectra of PDS 70, revealing chromospheric activity, circumstellar gas, and insights into the star's accretion and disk evolution, with implications for young planet-hosting stars nearing disk dispersal.
Contribution
First UV spectra of PDS 70 obtained with HST, providing new insights into its stellar atmosphere, circumstellar environment, and accretion processes.
Findings
Detection of chromospheric and transition region emission lines.
Presence of fluorescent H2 lines indicating irradiated circumstellar gas.
Estimated accretion rate consistent with previous measurements.
Abstract
We summarize Hubble Space Telescope (HST) UV observations of the weak-lined T Tauri star (wTTS) PDS 70 obtained with the Space Telescope Imaging Spectrograph (STIS). These observations provide the first far-UV (FUV) and near-UV (NUV) spectra of PDS 70. Ground-based observations have so far revealed two formative giant planets orbiting in a wide gap in its circumstellar disk. Both the star and young planets are thought to still be accreting. The HST spectra provide new insight into physical conditions in the star's outer atmosphere and circumstellar environment. The spectra are dominated by chromospheric and transition region emission lines with maximum formation temperatures log T = 4.5 - 5.2 K. Stellar continuum emission is present in the NUV but we find no significant FUV continuum, as could arise from accretion shocks. Several fluorescent FUV H2 emission lines are present, a…
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