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High-Resolution Near Infrared Spectroscopy of HD~100546: IV. Orbiting Companion Disappears on Schedule
Sean D. Brittain, Joan R. Najita, John S. Carr
HD~100546 is a Herbig Ae/Be star surrounded by a disk with a large central region that is cleared of gas and dust (i.e., an inner hole). High-resolution near-infrared spectroscopy…
Investing for Discovery in Astronomy
Joan R. Najita
How should we invest our available resources to best sustain astronomy's track record of discovery, established over the past few decades? Two strong hints come from (1) our histor…
The trail of water and the delivery of volatiles to habitable planets
Klaus M. Pontoppidan, Andrea Banzatti, Edwin Bergin +16
Water is fundamental to our understanding of the evolution of planetary systems and the delivery of volatiles to the surfaces of potentially habitable planets. Yet, we currently ha…
A high resolution mid-infrared survey of water emission from protoplanetary disks
Colette Salyk, John Lacy, Matt Richter +5
We present the largest survey of spectrally resolved mid-infrared water emission to date, with spectra for 11 disks obtained with the Michelle and TEXES spectrographs on Gemini Nor…
Investing for Discovery and Sustainability in Astronomy in the 2020s
Joan R. Najita
As the next decade approaches, it is once again time for the US astronomical community to assess its investment priorities for the coming decade on the ground and in space. This re…
The temporal requirements of directly observing self-gravitating spiral waves in protoplanetary discs with ALMA
Cassandra Hall, Ruobing Dong, Ken Rice +4
We investigate how the detectability of signatures of self-gravity in a protoplanetary disc depends on its temporal evolution. We run a one-dimensional model for secular timescales…