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Dust Properties of Protoplanetary Disks in the Taurus-Auriga Star Forming Region from Millimeter Wavelengths
L. Ricci, L. Testi, A. Natta +3
We present the most sensitive 3 mm-survey to date of protoplanetary disks carried in the Taurus-Auriga star forming region (average rms of about 0.3 mJy), using the IRAM PdBI. With…
Far-Ultraviolet H2 Emission from Circumstellar Disks
Laura Ingleby, Nuria Calvet, Edwin Bergin +15
We analyze the far-ultraviolet (FUV) spectra of 33 classical T Tauri stars (CTTS), including 20 new spectra obtained with the Advanced Camera for Surveys Solar Blind Channel (ACS/S…
Variable Sodium Absorption in a Low-Extinction Type Ia Supernova
Joshua D. Simon, Avishay Gal-Yam, Orly Gnat +18
Recent observations have revealed that some Type Ia supernovae exhibit narrow, time-variable Na I D absorption features. The origin of the absorbing material is controversial, but…
High Resolution Spectroscopy of [NeII] Emission from AA Tau and GM Aur
Joan R. Najita, Greg W. Doppmann, Martin A. Bitner +8
We present high resolution (R=80,000) spectroscopy of [NeII] emission from two young stars, GM Aur and AA Tau, which have moderate to high inclinations. The emission from both sour…
Measuring tiny mass accretion rates onto young brown dwarfs
Gregory J. Herczeg, Kelle L. Cruz, Lynne A. Hillenbrand
We present low-resolution Keck I/LRIS spectra spanning from 3200-9000 A of nine young brown dwarfs and three low-mass stars in the TW Hya Association and in Upper Sco. The optical…