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Variable Accretion Outbursts in Protostellar Evolution
Jaehan Bae, Lee Hartmann, Zhaohuan Zhu +1
We extend the one-dimensional, two-zone models of long-term protostellar disk evolution with infall of Zhu et al. to consider the potential effects of a finite viscosity in regions…
Evidence for Environmental Dependence of the Upper Stellar Initial Mass Function in Orion A
Wen-hsin Hsu, Lee Hartmann, Lori Allen +4
We extend our previous study of the stellar population of L1641, the lower-density star-forming region of the Orion A cloud south of the dense Orion Nebula Cluster (ONC), with the…
A 0.2 solar mass protostar with a Keplerian disk in the very young L1527 IRS system
John J. Tobin, Lee Hartmann, Hsin-Fang Chiang +5
In their earliest stages, protostars accrete mass from their surrounding envelopes through circumstellar disks. Until now, the smallest observed protostar/envelope mass ratio was ~…
The Dependence of Star Formation Efficiency on Gas Surface Density
Andreas Burkert, Lee Hartmann
Studies by Lada (2010) and Heiderman (2010) have suggested that star formation mostly occurs above a threshold in gas surface density Sigma of Sigma_c = 120 Msun pc^{-2} (A_K = 0.8…
ALMA and VLA observations of the outflows in IRAS 16293-2422
Laurent Loinard, Luis A. Zapata, Luis F. Rodriguez +10
We present ALMA and VLA observations of the molecular and ionized gas at 0.1-0.3 arcsec resolution in the Class 0 protostellar system IRAS 16293-2422. These data clarify the origin…
Tracing High-Energy Radiation from T Tauri Stars Using Mid-Infrared Neon Emission from Disks
C. Espaillat, L. Ingleby, E. Furlan +8
High-energy radiation from T Tauri stars (TTS) influences the amount and longevity of gas in disks, thereby playing a crucial role in the creation of gas giant planets. Here we pro…