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  • Oxford University Press (OUP)  (5)
  • Physics  (5)
  • 1
    In: Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 70, No. SP1 ( 2018-01-01)
    Abstract: Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of the 8.2-m Subaru telescope on the summit of Mauna Kea in Hawaii. A team of scientists from Japan, Taiwan, and Princeton University is using HSC to carry out a 300-night multi-band imaging survey of the high-latitude sky. The survey includes three layers: the Wide layer will cover 1400 deg2 in five broad bands (grizy), with a 5 σ point-source depth of r ≈ 26. The Deep layer covers a total of 26 deg2 in four fields, going roughly a magnitude fainter, while the UltraDeep layer goes almost a magnitude fainter still in two pointings of HSC (a total of 3.5 deg2). Here we describe the instrument, the science goals of the survey, and the survey strategy and data processing. This paper serves as an introduction to a special issue of the Publications of the Astronomical Society of Japan, which includes a large number of technical and scientific papers describing results from the early phases of this survey.
    Type of Medium: Online Resource
    ISSN: 0004-6264 , 2053-051X
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2018
    detail.hit.zdb_id: 282483-8
    detail.hit.zdb_id: 2083084-1
    SSG: 16,12
    Location Call Number Limitation Availability
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  • 2
    In: Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 71, No. 6 ( 2019-12-01)
    Abstract: This paper presents the second data release of the Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey using the 8.2 m Subaru Telescope. The release includes data from 174 nights of observation through 2018 January. The Wide layer data cover about 300 deg$^2$ in all five broad-band filters ($grizy$) to the nominal survey exposure (10 min in $gr$ and 20 min in $izy$). Partially observed areas are also included in the release; about 1100 deg$^2$ is observed in at least one filter and one exposure. The median seeing in the i-band is ${0_{.}^{\prime \prime }6}$, demonstrating the superb image quality of the survey. The Deep (26 deg$^2$) and UltraDeep (4 deg$^2$) data are jointly processed and the UltraDeep-COSMOS field reaches an unprecedented depth of $i\sim 28$ at $5 \, \sigma$ for point sources. In addition to the broad-band data, narrow-band data are also available in the Deep and UltraDeep fields. This release includes a major update to the processing pipeline, including improved sky subtraction, PSF modeling, object detection, and artifact rejection. The overall data quality has been improved, but this release is not without problems; there is a persistent deblender problem as well as new issues with masks around bright stars. The user is encouraged to review the issue list before utilizing the data for scientific explorations. All the image products as well as catalog products are available for download. The catalogs are also loaded into a database, which provides an easy interface for users to retrieve data for objects of interest. In addition to these main data products, detailed galaxy shape measurements withheld from Public Data Release 1 (PDR1) are now available to the community. The shape catalog is drawn from the S16A internal release, which has a larger area than PDR1 (160 deg$^2$). All products are available at the data release site, https://hsc-release.mtk.nao.ac.jp/.
    Type of Medium: Online Resource
    ISSN: 0004-6264 , 2053-051X
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2019
    detail.hit.zdb_id: 282483-8
    detail.hit.zdb_id: 2083084-1
    SSG: 16,12
    Location Call Number Limitation Availability
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  • 3
    In: Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 70, No. SP1 ( 2018-01-01)
    Abstract: The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is a three-layered imaging survey aimed at addressing some of the most important outstanding questions in astronomy today, including the nature of dark matter and dark energy. The survey has been awarded 300 nights of observing time at the Subaru Telescope, and it started in 2014 March. This paper presents the first public data release of HSC-SSP. This release includes data taken in the first 1.7 yr of observations (61.5 nights), and each of the Wide, Deep, and UltraDeep layers covers about 108, 26, and 4 square degrees down to depths of i ∼ 26.4, ∼26.5, and ∼27.0 mag, respectively (5 σ for point sources). All the layers are observed in five broad bands (grizy), and the Deep and UltraDeep layers are observed in narrow bands as well. We achieve an impressive image quality of 0${^{\prime\prime}_{.}}$6 in the i band in the Wide layer. We show that we achieve 1%–2% point spread function (PSF) photometry (root mean square) both internally and externally (against Pan-STARRS1), and ∼10 mas and 40 mas internal and external astrometric accuracy, respectively. Both the calibrated images and catalogs are made available to the community through dedicated user interfaces and database servers. In addition to the pipeline products, we also provide value-added products such as photometric redshifts and a collection of public spectroscopic redshifts. Detailed descriptions of all the data can be found online. The data release website is https://hsc-release.mtk.nao.ac.jp.
    Type of Medium: Online Resource
    ISSN: 0004-6264 , 2053-051X
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2018
    detail.hit.zdb_id: 282483-8
    detail.hit.zdb_id: 2083084-1
    SSG: 16,12
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    Oxford University Press (OUP) ; 2011
    In:  Publications of the Astronomical Society of Japan Vol. 63, No. 4 ( 2011-08-25), p. 835-847
    In: Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 63, No. 4 ( 2011-08-25), p. 835-847
    Abstract: The model of anisotropic loss of the mass and angular momentum is constructed and the non-conservative evolution of the binary system is investigated in this paper. The joint effects of the centrifugal force and tidal force cause the configurations of two components to become triaxial ellipsoids. The high-order disturbing potential, which includes the rotational and tidal distortions, is applied to describe the local gravity in a close binary system. The $g_{\rm eff}$($\theta$, $\varphi$)-effect dominates the mass-loss distribution in the massive O-type star. Both the $g_{\rm eff}$($\theta$, $\varphi$)-effect and the $\kappa$-effect have an important influence on the equatorial ejection, and the Roche lobe overflow and the H-shell burning occur earlier in the rotational models. The rotation and tide can intensify the mass loss before mass overflow, and the rate of stellar wind goes down, resulting from a decrease of the luminosity in the subsequent stages. The high-order disturbing potential and other associated physical factors may significantly affect the Roche lobe and might be possible to drive the non-conservative mass transfer process when the stars approach the break-up rotation. Rotation and tide can allow the primary to shift towards the blue side of the HR diagram and modify the thermal relaxation time-scale in the slow phase of the mass transfer in Case A. The star attempts to attain thermal equilibrium and displays a slightly cyclical expansion and contraction. When stellar wind was taken into consideration in the model, the secondary star accreted less mass than the model without stellar wind.
    Type of Medium: Online Resource
    ISSN: 2053-051X , 0004-6264
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2011
    detail.hit.zdb_id: 2083084-1
    detail.hit.zdb_id: 282483-8
    SSG: 16,12
    Location Call Number Limitation Availability
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  • 5
    In: Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 66, No. 6 ( 2014-12-01)
    Abstract: We report on the detection of a substellar companion orbiting an evolved intermediate-mass (M⋆ = 2.4 M⊙) star HD 14067 (G9 III) using a precise Doppler technique. Either a periodic Keplerian variation with a decreasing linear velocity trend (P = 1455 d, K1 = 92.2 m s−1, e = 0.533, and $\dot {\gamma } = -22.4\:$m s−1 yr−1) or a single Keplerian orbit without linear trend (P = 2850 d, K1 = 100.1 m s−1, and e = 0.697) can be well fitted to the radial velocities of this star. The minimum mass (m2 sin i = 7.8 MJ for the model with a linear trend, or m2 sin i = 9.0 MJ for the model without a linear trend) suggests a long-period giant planet orbiting an evolved intermediate-mass star. The eccentricity of the orbit is among the highest ones ever detected for planets moving around evolved stars.
    Type of Medium: Online Resource
    ISSN: 2053-051X , 0004-6264
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2014
    detail.hit.zdb_id: 2083084-1
    detail.hit.zdb_id: 282483-8
    SSG: 16,12
    Location Call Number Limitation Availability
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