Are Weak-Line T Tauri Stars Still Accreting?

Details Are Weak-Line T Tauri Stars Still Accreting? Are Weak-Line T Tauri Stars Still Accreting?

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12211c&link_type=abstract

HST Proposal ID #12211. Cycle 18

Physics

Scientific paper

The interesting events marking the end of accretion and the dispersal of gas in circumstellar disks are not well understood. This is due, in part, to the difficulty of detecting very low accretion rates, as accretion indicators become masked by stellar emission. At the same time, observing gas in the inner disk is difficult. The majority of the mass is in H2, which has no strong transitions in the optical and infrared. However, strong FUV H2 lines, excited by the high energy fields of young stars, are conspicuous in accreting stars and can be used as a probe of low accretion, detecting accretion rates four orders of magnitude lower than traditional accretion indicators. We propose to obtain FUV spectra of 13 Weak-line T Tauri stars with the ACS PR130L prism. Our previous work has shown that the presence of H2 is linked to accretion onto the star, so our observations will test if these supposedly non-accreting stars are still accreting at previously undetectable rates. Our results will have significant impact on the understanding of the end of the accretion phase.;

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