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  • 1
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    Progress in extra-solar planet detection (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Progress in extra-solar planet detection is reviewed. The following subject areas are covered: (1) the definition of a planet; (2) the weakness of planet signals; (3) direct techniques - imaging and spectral detection; and (4) indirect techniques - reflex motion and occultations.
    Keywords: ASTROPHYSICS
    Type: NAS-NRC, Planetary Sciences: American and Soviet Research; p 270-287
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    IRAS F15307+3252: A hyperluminous infrared galaxy at z = 0.93 (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: A new hyperluminous infrared galaxy in the Infrared Astronomy Satellite (IRAS) Faint Source Catalog is identified at a redshift of 0.93. This object has a bolometric luminosity of approximately 10(exp 13) solar luminosity, a very large ratio of infrared-to-optical luminosity, warm dust emission, a ratio of infrared-to-radio flux densities consistent with other infrared galaxies, and an optical spectrum similar to a Seyfert 2 galaxy. IRAS F15307+3552 shares these characteristics and its radio-to-optical spectral energy distribution with two other infrared galaxies, F10214+4724 and P09104+4109. Discovery of a third object with these properties defines an extreme subclass of ultraluminous galaxies powered primarily by star formation. The systematic method used to find this object begins the process of determining the space density of these most luminous examples of the infrared galaxy phenomenon.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 424; 2; p. L65-L68
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    On the feasibility of detecting extrasolar planets by reflected starlight using the Hubble Space Telescope (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The best metrology data extant are presently used to estimate the center and wing point-spread function of the HST, in order to ascertain the implications of an observational criterion according to which a faint source's discovery can occur only when the signal recorded near its image's location is sufficiently larger than would be expected in its absence. After defining the maximum star-planet flux ratio, a figure of merit Q, defined as the contrast ratio between a 'best case' planet and the scattered starlight background, is introduced and shown in the HST's case to be unfavorable for extrasolar planet detection.
    Keywords: ASTROPHYSICS
    Type: Icarus (ISSN 0019-1035); 87; 484-497
    Format: text
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    NASA TECHNICAL REPORTS
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