Christopher W Stubbs

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The High-z Supernova Search Team has discovered and observed 8 new supernovae in the redshift interval z = 0.3–1.2. These independent observations, analyzed by similar but distinct methods, confirm the result of Riess et al. (1998a) and Perlmutter et al. (1999) that supernova luminosity distances imply an accelerating universe. More importantly, they extend(More)
3 Based in part on observations taken with the Very Large Telescope under ESO program 170.A-0519. – 3 – We present broad-band light curves of nine supernovae ranging in redshift from 0.5 to 0.8. The supernovae were discovered as part of the ESSENCE project, and the light curves are a combination of Cerro Tololo 4-m and Hubble Space Telescope (HST)(More)
  • Citation Hicken, Peter Malcolm, Saurabh Challis, Robert P Jha, Tom Kirshner, Maryam Matheson +77 others
  • 2009
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. ABSTRACT We present multiband photometry of 185 type-Ia supernovae (SNe Ia),(More)
We present a mechanism by which organisms with only a single photoreceptor, which have a monochromatic view of the world, can achieve color discrimination. An off-axis pupil and the principle of chromatic aberration (where different wavelengths come to focus at different distances behind a lens) can combine to provide "color-blind" animals with a way to(More)
We review the systematic uncertainties that have plagued attempts to obtain high precision and high accuracy from ground-based photometric measurements using CCDs. We identify two main challenges in breaking through the 1% precision barrier: 1) fully characterizing atmospheric transmission, along the instrument's line of sight, and 2) properly identifying,(More)
We present a detailed observational strategy for finding Near Earth Objects (NEOs) with the Sloan Digital Sky Survey (SDSS) telescope. We investigate strategies in normal, unbinned mode as well as binning the CCDs 2×2 or 3×3, which affects the sky coverage rate and the limiting apparent magnitude. We present results from 1 month, 3 year and 10 year(More)
  • John R Andrew, J Roger, P Angel, Tim S Axelrod, Jeffrey D Barr, James G Bartlett +55 others
  • 2009
This chapter covers the basic elements of the LSST system design, with particular emphasis on those elements that may affect the scientific analyses discussed in subsequent chapters. We start with a description of the planned observing strategy in § 2.1, and then go on to describe the key technical aspects of system, including the choice of site (§ 2.2),(More)
We present 838 ab-type RR Lyrae stars from the Lowell Observatory Near Earth Objects Survey Phase I (LONEOS-I). These objects cover 1430 deg 2 and span distances ranging from 3-30kpc from the Galactic Center. Object selection is based on phased, photometric data with 28-50 epochs. We use this large sample to explore the bulk properties of the stellar halo,(More)
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