| 1. |
- Gould, A., et al.
(författare)
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MOA-2010-BLG-523:" Failed Planet"= RS CVn Star
- 2013
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Ingår i: Astrophysical Journal. - 0004-637X. ; 763:2
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Tidskriftsartikel (refereegranskat)abstract
- The Galactic bulge source MOA-2010-BLG-523S exhibited short-term deviations from a standard microlensing light curve near the peak of an A(max) similar to 265 high-magnification microlensing event. The deviations originally seemed consistent with expectations for a planetary companion to the principal lens. We combine long-term photometric monitoring with a previously published high-resolution spectrum taken near peak to demonstrate that this is an RS CVn variable, so that planetary microlensing is not required to explain the light-curve deviations. This is the first spectroscopically confirmed RS CVn star discovered in the Galactic bulge.
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| 2. |
- Sumi, T., et al.
(författare)
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The first Neptune analog or super-earth with a Neptune-like orbit : MOA-2013-BLG-605LB
- 2016
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Ingår i: Astrophysical Journal. - 0004-637X. ; 825:2
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Tidskriftsartikel (refereegranskat)abstract
- We present the discovery of the first Neptune analog exoplanet or super-Earth with a Neptune-like orbit, MOA-2013-BLG-605Lb. This planet has a mass similar to that of Neptune or a super-Earth and it orbits at 9 ∼ 14 times the expected position of the snow line, a snow, which is similar to Neptune's separation of 11 a snow from the Sun. The planet/host-star mass ratio is q = (3.6 ± 0.7) × 10-4 and the projected separation normalized by the Einstein radius is s = 2.39 ± 0.05. There are three degenerate physical solutions and two of these are due to a new type of degeneracy in the microlensing parallax parameters, which we designate "the wide degeneracy." The three models have (i) a Neptune-mass planet with a mass of Mp = 21-7 +6M⊕ orbiting a low-mass M-dwarf with a mass of Mh = 0.19-0.06 +0.05M⊙, (ii) a mini-Neptune with Mp = 7.9-1.2 +1.8M⊕ orbiting a brown dwarf host with Mh = 0.068-0.011 +0.019M⊙, and (iii) a super-Earth with Mp = 3.2-0.3 +0.5MM⊕ orbiting a low-mass brown dwarf host with Mh = 0.025-0.0004 +0.005M⊙, which is slightly favored. The 3D planet-host separations are 4.6-1.2 +4.7au, 2.1-0.2 +1.0au, and 0.94-0.02 +0.67au, which are 8.9-1.4 +10.5, 12-1 +7, or 14-1 +11 times larger than a snow for these models, respectively. Keck adaptive optics observations confirm that the lens is faint. This discovery suggests that low-mass planets with Neptune-like orbits are common. Therefore processes similar to the one that formed Neptune in our own solar system or cold super-Earths may be common in other solar systems.
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| 3. |
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| 4. |
- Shah, Umer, et al.
(författare)
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500-600 GHz RF MEMS Based Tunable Stub Integrated in Micromachined Rectangular Waveguide
- 2015
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Ingår i: 2015 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS). - : IEEE. - 9781479982752
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Konferensbidrag (refereegranskat)abstract
- This paper presents a 500-600 GHz switchable E-plane waveguide stub tuned MEMS device. It is the first ever RF MEMS component reported to be operating above 220 GHz. The micromachined E-plane stub can be blocked/unblocked from the micromachined waveguide by using a MEMS-reconfigurable surface. The surface is designed so that in the blocking state it is in the H-plane and comprises the roof of the main waveguide, whereas in the non-blocking state it comprises a transmissive E-plane surface for the stub. The measurement results of the first prototypes show a return loss better than 15 dB from 500-600 GHz. The insertion loss is better than 3 dB up to 550 GHz, and better than 4 dB up to 600 GHz. The switchable stub can be utilized as a basic reconfigurable device for tuning/matching of waveguide components under operation; the implemented prototype switchable stub achieves a (measured) tuning of 2.50 at 500 GHz, with a change in S21 better than 0.15 dB for the whole band. The paper further shows that the reconfigurable stub can also be operated in analog tuning mode. This paper also demonstrates that MEMS-reconfigurable E-plane surfaces can be designed and operated deep into the submillimeter-wave frequency range.
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| 5. |
- Van, den Berg M, et al.
(författare)
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Toxic equivalency factors (TEFs) for PCBs, PCDDs, PCDFs for humans and wildlife
- 1998
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Ingår i: ENVIRONMENTAL HEALTH PERSPECTIVES. - : US DEPT HEALTH HUMAN SERVICES PUBLIC HEALTH SERVICE. ; 106:12, s. 775-792
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Recension (övrigt vetenskapligt/konstnärligt)abstract
- An expert meeting was organized by the World Health Organization (WHO) and held in Stockholm on 15-18 June 1997. The objective of this meeting was to derive consensus toxic equivalency factors (TEFs) for polychlorinated dibenzo-p-dioxins (PCDDs) and diben
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