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Publisher: American Institute of Aeronautics and Astronautics (AIAA)   (Total: 7 journals)

AIAA J.     Full-text available via subscription   (Followers: 454, SJR: 0.915, h-index: 82)
J. of Aerospace Computing, Information, and Communication     Full-text available via subscription   (Followers: 12, SJR: 0.319, h-index: 17)
J. of Aircraft     Full-text available via subscription   (Followers: 255, SJR: 0.697, h-index: 48)
J. of Guidance, Control, and Dynamics     Full-text available via subscription   (Followers: 49, SJR: 1.389, h-index: 73)
J. of Propulsion and Power     Full-text available via subscription   (Followers: 205, SJR: 0.581, h-index: 54)
J. of Spacecraft and Rockets     Full-text available via subscription   (Followers: 304, SJR: 0.546, h-index: 41)
J. of Thermophysics and Heat Transfer     Full-text available via subscription   (Followers: 38, SJR: 0.567, h-index: 39)
Journal Cover Journal of Aerospace Computing, Information, and Communication
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     ISSN (Print) 1940-3151 - ISSN (Online) 1542-9423
     Published by American Institute of Aeronautics and Astronautics (AIAA) Homepage  [7 journals]   [SJR: 0.319]   [H-I: 17]
  • Optical and Ultraviolet Observations of the Narrow-lined Type Ia SN 2012fr
           in NGC 1365
    • Authors: Ju-Jia Zhang; Xiao-Feng Wang, Jin-Ming Bai, Tian-Meng Zhang, Bo Wang, Zheng-Wei Liu, Xu-Lin Zhao, Jun-Cheng Chen
      First page: 1
      Abstract: Extensive optical and ultraviolet (UV) observations of the type Ia supernova (SN Ia) 2012fr are presented in this paper. It has a relatively high luminosity, with an absolute B -band peak magnitude of about –19.5 mag and a smaller post-maximum decline rate than normal SNe Ia (e.g., Δ m 15 ( B ) =0.85 ± 0.05 mag). Based on the UV and optical light curves, we derived that a 56 Ni mass of about 0.88 M ☉ was synthesized in the explosion. The earlier spectra are characterized by noticeable high-velocity features of Si II λ6355 and Ca II with velocities in the range of ~22, 000-25, 000 km s –1 . At around the maximum light, these spectral features are dominated by the photospheric components which are noticeably narrower than normal SNe Ia. The post-maximum velocity of the photosphere remains almost constant at ~12,000 km s –1 for about one month, reminiscent of ...
      Citation: The Astronomical Journal
      PubDate: 2014-05-23T00:00:00Z
      Issue No: Vol. 148, No. 1 (2014)
       
  • Identifying High-redshift Gamma-Ray Bursts with RATIR
    • Authors: O. M. Littlejohns; N. R. Butler, A. Cucchiara, A. M. Watson, A. S. Kutyrev, W. H. Lee, M. G. Richer, C. R. Klein, O. D. Fox, J. X. Prochaska, J. S. Bloom, E. Troja, E. Ramirez-Ruiz, J. A. de Diego, L. Georgiev, J. González, C. G. Román-Zúñiga, N. Gehrels, H. Moseley
      First page: 2
      Abstract: We present a template-fitting algorithm for determining photometric redshifts, z phot , of candidate high-redshift gamma-ray bursts (GRBs). Using afterglow photometry, obtained by the Reionization and Transients InfraRed (RATIR) camera, this algorithm accounts for the intrinsic GRB afterglow spectral energy distribution, host dust extinction, and the effect of neutral hydrogen (local and cosmological) along the line of sight. We present the results obtained by this algorithm and the RATIR photometry of GRB 130606A, finding a range of best-fit solutions, 5.6 < z phot < 6.0, for models of several host dust extinction laws (none, the Milky Way, Large Magellanic Clouds, and Small Magellanic Clouds), consistent with spectroscopic measurements of the redshift of this GRB. Using simulated RATIR photometry, we find that our algorithm provides precise measures of z phot in the ranges of 4 < z phot ##IMG##
      Citation: The Astronomical Journal
      PubDate: 2014-05-23T00:00:00Z
      Issue No: Vol. 148, No. 1 (2014)
       
  • Bright Debris Disk Candidates Detected with the AKARI/Far-infrared
           Surveyor
    • Authors: Qiong Liu; Tinggui Wang, Peng Jiang
      First page: 3
      Abstract: We cross-correlate the Hipparcos main-sequence star catalog with the AKARI /FIS catalog and identify 136 stars (at >90% reliability) with far-infrared detections in at least one band. After rejecting 57 stars classified as young stellar objects, Be stars and other type stars with known dust disks or with potential contaminations, and 4 stars without infrared excess emission, we obtain a sample of 75 candidate stars with debris disks. Stars in our sample cover spectral types from B to K with most being early types. This represents a unique sample of luminous debris disks that derived uniformly from an all-sky survey with a spatial resolution factor of four better than the previous such survey by IRAS . Moreover, by collecting the infrared photometric data from other public archives, almost three-quarters of them have infrared excesses in more than one band, allowing an estimate of the dust temperatures. We fit the blackbody model to the broadband spectral en...
      Citation: The Astronomical Journal
      PubDate: 2014-05-23T00:00:00Z
      Issue No: Vol. 148, No. 1 (2014)
       
  • New 2MASS Near-infrared Photometry for Globular Clusters in M31
    • Authors: Song Wang; Jun Ma, Zhenyu Wu, Xu Zhou
      First page: 4
      Abstract: We present Two Micron All Sky Survey JHK s photometry for 913 star clusters and candidates in the field of M31, which are selected from the latest Revised Bologna Catalog of M31 globular clusters (GCs) and candidates. The photometric measurements in this paper supplement this catalog, and provide the most comprehensive and homogeneous photometric catalog for M31 GCs in the JHK s bandpasses. In general, our photometry is consistent with previous measurements. The globular cluster luminosity function (GCLF) peaks for the confirmed GCs derived by fitting a t 5 distribution using the maximum likelihood method are ##IMG## [http://ej.iop.org/images/1538-3881/148/1/4/aj494915ieqn1.gif] {$J_0 = 15.348_{-0.208}^{+0.206}$} , ##IMG## [http://ej.iop.org/images/1538-3881/148/1/4/aj494915ieqn2.gif] {$H_0 = 14.703_{-0.180}^{+0.176}$} , and ##IMG## {${K_{\rm s}}_0 = 14.534_{-0.146}^{+...}
      Citation: The Astronomical Journal
      PubDate: 2014-05-23T00:00:00Z
      Issue No: Vol. 148, No. 1 (2014)
       
  • The Spiral Arms of the Milky Way: The Relative Location of Each Different
           Arm Tracer within a Typical Spiral Arm Width
    • Authors: Jacques P. Vallée
      First page: 5
      Abstract: From the Sun's location in the Galactic disk, different arm tracers (CO, H I , hot dust, etc.) have been employed to locate a tangent to each spiral arm. Using all various and different observed spiral arm tracers (as published elsewhere), we embark on a new goal, namely the statistical analysis of these published data (data mining) to statistically compute the mean location of each spiral arm tracer. We show for a typical arm cross-cut, a separation of 400 pc between the mid-arm and the dust lane (at the inner edge of the arm, toward the Galactic center). Are some arms major and others minor' Separating arms into two sets, as suggested by some, we find the same arm widths between the two sets. Our interpretation is that we live in a multiple (four-arm) spiral (logarithmic) pattern (around a pitch angle of 12°) for the stars and gas in the Milky Way, with a sizable interarm separation (around 3 kpc) at the Sun's location and the same arm width for each ar...
      Citation: The Astronomical Journal
      PubDate: 2014-05-23T00:00:00Z
      Issue No: Vol. 148, No. 1 (2014)
       
  • Interesting Features in the Combined GALEX and Sloan Color Diagrams of
           Solar-like Galactic Populations
    • Authors: Myron A. Smith; Luciana Bianchi, Bernard Shiao
      First page: 159
      Abstract: We report on intriguing photometric properties of Galactic stars observed in the Galaxy Evolution Explorer ( GALEX ) satellite's far-UV (FUV) and near-UV (NUV) bandpasses, as well as from the ground-based Sloan Digital Sky Survey (SDSS) and the Kepler Input Catalog. The first property is that the (FUV – NUV) color distribution of stars in the Kepler field consists of two well-separated peaks. A second and more perplexing property is that for stars with spectral types G or later the mean (FUV – NUV) color becomes much bluer, contrary to expectation. Investigating this tendency further, we found in two samples of mid-F through K type stars that 17%-22% of them exhibit FUV excesses relative to their NUV fluxes and spectral types. A correction for FUV incompleteness of the FUV magnitude-limited star sample brings this ratio to 14%-18%. Nearly the same fractions are also discovered among members of the Kepler Eclipsing Binary Catalog and in the publis...
      Citation: The Astronomical Journal
      PubDate: 2014-05-14T00:00:00Z
      Issue No: Vol. 147, No. 6 (2014)
       
  • Prospecting in Ultracool Dwarfs: Measuring the Metallicities of Mid- and
           Late-M Dwarfs
    • Authors: Andrew W. Mann; Niall R. Deacon, Eric Gaidos, Megan Ansdell, John M. Brewer, Michael C. Liu, Eugene A. Magnier, Kimberly M. Aller
      First page: 160
      Abstract: Metallicity is a fundamental parameter that contributes to the physical characteristics of a star. The low temperatures and complex molecules present in M dwarf atmospheres make it difficult to measure their metallicities using techniques that have been commonly used for Sun-like stars. Although there has been significant progress in developing empirical methods to measure M dwarf metallicities over the last few years, these techniques have been developed primarily for early- to mid-M dwarfs. We present a method to measure the metallicity of mid- to late-M dwarfs from moderate resolution ( R ~ 2000) K -band ( ##IMG## [http://ej.iop.org/icons/Entities/sime.gif] {sime} 2.2 μm) spectra. We calibrate our formula using 44 wide binaries containing an F, G, K, or early-M primary of known metallicity and a mid- to late-M dwarf companion. We show that similar features and techniques used for early-M dwarf...
      Citation: The Astronomical Journal
      PubDate: 2014-05-14T00:00:00Z
      Issue No: Vol. 147, No. 6 (2014)
       
  • Transmission Spectroscopy of the Hot Jupiter WASP-12b from 0.7 to 5
           μm
    • Authors: Kevin B. Stevenson; Jacob L. Bean, Andreas Seifahrt, Jean-Michel Désert, Nikku Madhusudhan, Marcel Bergmann, Laura Kreidberg, Derek Homeier
      First page: 161
      Abstract: Since the first report of a potentially non-solar carbon-to-oxygen ratio (C/O) in its dayside atmosphere, the highly irradiated exoplanet WASP-12b has been under intense scrutiny and the subject of many follow-up observations. Additionally, the recent discovery of stellar binary companions ~1'' from WASP-12 has obfuscated interpretation of the observational data. Here we present new ground-based multi-object transmission-spectroscopy observations of WASP-12b that we acquired over two consecutive nights in the red optical with Gemini-N/GMOS. After correcting for the influence of WASP-12's stellar companions, we find that these data rule out a cloud-free H 2 atmosphere with no additional opacity sources. We detect features in the transmission spectrum that may be attributed to metal oxides (such as TiO and VO) for an O-rich atmosphere or to metal hydrides (such as TiH) for a C-rich atmosphere. We also reanalyzed NIR transit-spectroscopy observations of WASP-12b from H...
      Citation: The Astronomical Journal
      PubDate: 2014-05-14T00:00:00Z
      Issue No: Vol. 147, No. 6 (2014)
       
  • Multi-frequency Observations of a Superbubble in the LMC: The Case of
           LHA 120-N 70
    • Authors: A. Y. De Horta; E. R. Sommer, M. D. Filipović, A. O'Brien, L. M. Bozzetto, J. D. Collier, G. F. Wong, E. J. Crawford, N. F. H. Tothill, P. Maggi, F. Haberl
      First page: 162
      Abstract: We present a detailed study of new Australia Telescope Compact Array and XMM-Newton observations of LHA 120-N 70 (hereafter N 70), a spherically shaped object in the Large Magellanic Cloud, classified as a superbubble. Both archival and new observations were used to produce high quality radio continuum, X-ray, and optical images. The radio spectral index of N 70 is estimated to be α = –0.12 ± 0.06, indicating that while a supernova (SN) or supernovae have occurred in the region at some time in the distant past, N 70 is not the remnant of a single specific SN. N 70 exhibits limited polarization with a maximum fractional polarization of 9% in a small area of the northwest limb. We estimate the size of N 70 to have a diameter of 104 pc (±1 pc). The morphology of N 70 in X-rays closely follows that in radio and optical, with most X-ray emission confined within the bright shell seen at longer wavelengths. Purely thermal models adequately fit the soft X-ray spectrum which lacks...
      Citation: The Astronomical Journal
      PubDate: 2014-05-14T00:00:00Z
      Issue No: Vol. 147, No. 6 (2014)
       
  • Erratum: "Contamination in the Kepler Field. Identification of 685 KOIs as
           False Positives via Ephemeris Matching Based on Q1-Q12 Data" (2014,
           AJ, 147, 119)
    • Authors: Jeffrey L. Coughlin; Susan E. Thompson, Stephen T. Bryson, Christopher J. Burke, Douglas A. Caldwell, Jessie L. Christiansen, Michael R. Haas, Steve B. Howell, Jon M. Jenkins, Jeffery J. Kolodziejczak, Fergal R. Mullally, Jason F. Rowe
      First page: 163
      Abstract: Description unavailable
      Citation: The Astronomical Journal
      PubDate: 2014-05-14T00:00:00Z
      Issue No: Vol. 147, No. 6 (2014)
       
 
 
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