0 Assigned ID: 2973 ----- Attempting Submission 1 (Thu Mar 24 13:16:58 GMT 2022) ----- HST Phase I Proposal 2973 successfully submitted. Receipt: # 2973-1 ----- Attempting Submission 2 (Thu Mar 24 22:37:00 GMT 2022) ----- HST Phase I Proposal 2973 successfully submitted. Receipt: # 2973-2 ----- Attempting Submission 3 (Fri Mar 25 19:50:13 GMT 2022) ----- HST Phase I Proposal 2973 successfully submitted. Receipt: # 2973-3 ----- Attempting Submission 4 (Fri Mar 25 20:11:28 GMT 2022) ----- 0 We propose to analyze the Mg II 2800 doublet lines in 14 stars in the Taurus star-forming region observed in the Disks, Accretion, and Outflows program (DAO, GO11616) to search for evidence of depletion that might be due to the formation of Earths and super-Earths in the innermost gas disks of the targets. The Mg II lines form in the magnetospheric accretion flow in which matter is transferred from the inner disk to the star, and therefore they offer a direct assessment of the gas in the innermost disk. We will estimate the Mg abundance entering the gas disk by modeling the Mg-rich minerals in the silicate features present in the spectral energy distributions of the targets. The comparison of gas and dust abundances will be used to test models of in-situ formation of super-Earths. The Taurus targets are well characterized from the X-rays to the submillimeter and have been used as templates for low mass young populations for decades. The medium resolution observations in the NUV make the DAO sample unique, unmatched by even the legacy program ULLYSES, and allows resolving the Mg II lines for detailed modeling. PI Nuria Calvet is an expert in magnetospheric accretion and protoplanetary disks. She has led many HST programs over the years and was a member of the ULLYSES Legacy Working Group and of the Disks, Accretion, and Outflows collaboration. Co-I Greg Herczeg is an expert in magnetospheric accretion and protoplanetary disks. He has led many HST programs and was the PI of the Disks, Accretion, and Outflows collaboration. He was also a member of the ULLYSES Legacy Working Group. Co-I Lee Hartmann is an expert in star and planet formation, accretion, winds, and protoplanetary disks. Hartmann, with Herczeg and Calvet, wrote a recent Annual Review of Astronomy Astrophysics on Accretion in young objects. Co-I Thanawith Thanathibodee is an expert in magnetospheric accretion in young objects. Co-I Marbely Micolta is a first-year graduate student in Michigan working with the PI. Results of the proposed analysis will be part of her PhD thesis. Micolta will do the magnetospheric and disk+wind modeling as well as the SED modeling, under the guidance of the PI and Co-Is Thanathibodee and Hartmann. Herczeg will inform on the data, and Hartmann will participate in the magnetospheric and wind modeling. All the team will participate on the final analysis of the results. Exoplanets and Exoplanet Formation Stellar Physics and Stellar Types 0 Regular false false true false false false SUPPORTED