Thumbnail
Access Restriction
Open

Author Doppmann, Greg W. ♦ Najita, Joan R. ♦ Carr, John S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ ABUNDANCE ♦ CARBON ♦ CARBON MONOXIDE ♦ CORRECTIONS ♦ DUSTS ♦ EMISSION ♦ GASES ♦ INTERSTELLAR SPACE ♦ MASS ♦ PLANETS ♦ PROTOPLANETS ♦ RESOLUTION ♦ SPECTRA ♦ SPIN ♦ T TAURI STARS
Abstract Residual gas in disks around young stars can spin down stars, circularize the orbits of terrestrial planets, and whisk away the dusty debris that is expected to serve as a signpost of terrestrial planet formation. We have carried out a sensitive search for residual gas and dust in the terrestrial planet region surrounding young stars ranging in age from a few to ∼10 Myr. Using high-resolution 4.7 μ m spectra of transition objects (TOs) and weak T Tauri stars, we searched for weak continuum excesses and CO fundamental emission, after making a careful correction for the stellar contribution to the observed spectrum. We find that the CO emission from TOs is weaker and located farther from the star than CO emission from nontransition T Tauri stars with similar stellar accretion rates. The difference is possibly the result of chemical and/or dynamical effects (i.e., a low CO abundance or close-in low-mass planets). The weak T Tauri stars show no CO fundamental emission down to low flux levels (5 × 10{sup −20} to 10{sup −18} W m{sup −2}). We illustrate how our results can be used to constrain the residual disk gas content in these systems and discuss their potential implications for star and planet formation.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-02-20
Publisher Place United States
Journal Astrophysical Journal
Volume Number 836
Issue Number 2


Open content in new tab

   Open content in new tab