Adaptive optics for the Thirty Meter Telescope

Adaptive Optics (AO) will be essential for at least seven of the eight science instruments currently planned for the Thirty Meter Telescope (TMT). These instruments include three near infra-red (NIR) imagers and spectrometers with fields of view from 2 to 30 arc seconds, a mid-IR echelle spectrometer, a planet formation imager/spectrometer, a wide field optical spectrograph, and a NIR multi-object spectrometer with multiple integral field units deployable over a 5 arc minute field of regard. In this paper we describe the overall AO reference design that supports these instruments, which consists of a facility AO system feeding the first three instruments and dedicated AO systems for the remaining four. Key design challenges for these systems include very high-order, large-stroke wavefront correction, tip-tilt sensing with faint natural guide stars to maximize sky coverage, laser guidestar wavefront sensing on a very large aperture, and achieving extremely high contrast ratios for the detection of extra-solar planets and other faint companions of bright stars. We describe design concepts for meeting these challenges and summarize our supporting plans for AO component development

Starshade Rendezvous Probe

The Starshade Rendezvous Probe Mission (https://smd-prod.s3.amazonaws.com/science-red/s3fs-public/atoms/files/Starshade2.pdf ) [1] will be the first space-based, high-contrast imaging mission with the potential to detect and characterize Earth-like planets in the habitable zone (HZ) around sunlike stars while at the same time exploring entire planetary systems about our nearest neighbors. Over the last two decades, astronomers have discovered and cataloged thousands of planets around other stars. Nevertheless, we have yet to find a planetary system like our own or to characterize discovered small planets to determine if they are similar to Earth. The next step in exploration is to image full planetary systems, including their HZs, and to obtain planetary spectra with enough sensitivity to determine if a planet is Earth-like. A space-based direct imaging mission to ultimately find and characterize other Earth-like planets is a long-term priority for space astrophysics [2, 3]

Exploring the NRO Opportunity for a Hubble-sized Wide-field Near-IR Space Telescope -- NEW WFIRST

We discuss scientific, technical and programmatic issues related to the use of an NRO 2.4m telescope for the WFIRST initiative of the 2010 Decadal Survey. We show that this implementation of WFIRST, which we call "NEW WFIRST," would achieve the goals of the NWNH Decadal Survey for the WFIRST core programs of Dark Energy and Microlensing Planet Finding, with the crucial benefit of deeper and/or wider near-IR surveys for GO science and a potentially Hubble-like Guest Observer program. NEW WFIRST could also include a coronagraphic imager for direct detection of dust disks and planets around neighboring stars, a high-priority science and technology precursor for future ambitious programs to image Earth-like planets around neighboring stars.Comment: 76 pages, 26 figures -- associated with the Princeton "New Telescope Meeting

Exploring the NRO Opportunity for a Hubble-Sized Wide-Field Near-IR Space Telescope - New WFIRST

We discuss scientific, technical, and programmatic issues related to the use of an NRO 2.4m telescope for the WFIRST initiative of the 2010 Decadal Survey. We show that this implementation of WFIRST, which we call "NEW WFIRST," would achieve the goals of the NWNH Decadal Survey for the WFIRST core programs of Dark Energy and Microlensing Planet Finding, with the crucial benefit of deeper and/or wider near-IR surveys for GO science and a potentially Hubble-like Guest Observer program. NEW WFIRST could also include a coronagraphic imager for direct detection of dust disks and planets around neighboring stars, a high-priority science and technology precursor for future ambitious programs to image Earth-like planets around neighboring stars

Cases, Materials and Notes on Partnerships and Canadian Business Corporations, Fifth Edition

The 5th edition of Cases, Materials and Notes on Partnerships and Canadian Business Corporations remains the definitive source of the law relating to partnerships and corporations. This edition provides a comprehensive update (including commentary) of statutory and common law changes affecting corporate law, shareholder rights and remedies and director duties, including an in depth discussion of the Supreme Court\u27s decision in the People and BCE series of cases. The text has also been retooled to be more concise while maintaining the level of depth necessary to provide a thorough understanding of the relevant principles and issues in corporate law and the law of partnerships. Major issues covered include directors\u27 duties, the oppression remedy, shareholder activism.https://digitalcommons.osgoode.yorku.ca/faculty_books/1050/thumbnail.jp

Cases, Materials and Notes on Partnerships and Canadian Business Corporations, Fifth Edition

The 5th edition of Cases, Materials and Notes on Partnerships and Canadian Business Corporations remains the definitive source of the law relating to partnerships and corporations. This edition provides a comprehensive update (including commentary) of statutory and common law changes affecting corporate law, shareholder rights and remedies and director duties, including an in depth discussion of the Supreme Court\u27s decision in the People and BCE series of cases. The text has also been retooled to be more concise while maintaining the level of depth necessary to provide a thorough understanding of the relevant principles and issues in corporate law and the law of partnerships. Major issues covered include directors\u27 duties, the oppression remedy, shareholder activism.https://digitalcommons.osgoode.yorku.ca/faculty_books/1050/thumbnail.jp