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FREE-FLOATING PLANETS, THE EINSTEIN DESERT, AND 'OUMUAMUA
Gould, Andrew,Jung, Youn Kil,Hwang, Kyu-Ha,Dong, Subo,Albrow, Michael D.,Chung, Sun-Ju,Han, Cheongho,Ryu, Yoon-Hyun,Shin, In-Gu,Shvartzvald, Yossi,Yang, Hongjing,Yee, Jennifer C.,Zang, Weicheng,Cha, S The Korean Astronomical Society 2022 Journal of The Korean Astronomical Society Vol.55 No.5
We complete the survey for finite-source/point-lens (FSPL) giant-source events in 2016-2019 KMTNet microlensing data. The 30 FSPL events show a clear gap in Einstein radius, 9 𝜇as < 𝜃<sub>E</sub> < 26 𝜇as, which is consistent with the gap in Einstein timescales near t<sub>E</sub> ~ 0.5 days found by Mróz et al. (2017) in an independent sample of point-source/point-lens (PSPL) events. We demonstrate that the two surveys are consistent. We estimate that the 4 events below this gap are due to a power-law distribution of free-floating planet candidates (FFPs) dN<sub>FFP</sub>/d log M = (0.4 ± 0.2) (M/38 M<sub>⊕</sub>)<sup>-p</sup>/star, with 0.9 ≲ p ≲ 1.2. There are substantially more FFPs than known bound planets, implying that the bound planet power-law index 𝛾 = 0.6 is likely shaped by the ejection process at least as much as by formation. The mass density per decade of FFPs in the Solar neighborhood is of the same order as that of 'Oumuamua-like objects. In particular, if we assume that 'Oumuamua is part of the same process that ejected the FFPs to very wide or unbound orbits, the power-law index is p = 0.89 ± 0.06. If the Solar System's endowment of Neptune-mass objects in Neptune-like orbits is typical, which is consistent with the results of Poleski et al. (2021), then these could account for a substantial fraction of the FFPs in the Neptune-mass range.
OGLE-2011-BLG-0417: A RADIAL VELOCITY TESTBED FOR MICROLENSING
Gould, Andrew,Shin, In-Gu,Han, Cheongho,Udalski, Andrzej,Yee, Jennifer C. IOP Publishing 2013 The Astrophysical journal Vol.768 No.2
<P>Microlensing experiments are returning increasingly detailed information about the planetary and binary systems that are being detected, far beyond what was originally expected. In several cases the lens mass and distance are measured, and a few very special cases have yielded complete eight-parameter Kepler solutions, i.e., the masses of both components, five Kepler invariants, and the phase. We identify one such case that is suitable for a precision test that could be carried out by comparing Doppler radial velocity (RV) measurements with the predictions from the microlensing solution. The lens primary is reasonably bright (I = 16.3, V = 18.2) and is expected to have a relatively large RV semi-amplitude (K similar to 6.35 km s(-1)).</P>
Recent Progress on Branched-Chain Amino Acids in Obesity, Diabetes, and Beyond
Md Abu Bakkar Siddik,Andrew C. Shin 대한내분비학회 2019 Endocrinology and metabolism Vol.34 No.3
Branched-chain amino acids (BCAAs) are essential amino acids that are not synthesized in our body; thus, they need to be obtainedfrom food. They have shown to provide many physiological and metabolic benefits such as stimulation of pancreatic insulin secretion, milk production, adipogenesis, and enhanced immune function, among others, mainly mediated by mammalian target of rapamycin (mTOR) signaling pathway. After identified as a reliable marker of obesity and type 2 diabetes in recent years, an increasing number of studies have surfaced implicating BCAAs in the pathophysiology of other diseases such as cancers, cardiovasculardiseases, and even neurodegenerative disorders like Alzheimer’s disease. Here we discuss the most recent progress and review studies highlighting both correlational and potentially causative role of BCAAs in the development of these disorders. Although we arejust beginning to understand the intricate relationships between BCAAs and some of the most prevalent chronic diseases, currentfindings raise a possibility that they are linked by a similar putative mechanism.
KMT-2017-BLG-0165Lb: A Super-Neptune-mass Planet Orbiting a Sun-like Host Star
Kil Jung, Youn,Gould, Andrew,Zang, Weicheng,Hwang, Kyu-Ha,Ryu, Yoon-Hyun,Han, Cheongho,Yee, Jennifer C.,Albrow, Michael D.,Chung, Sun-Ju,Shin, In-Gu,Shvartzvald, Yossi,Zhu, Wei,Cha, Sang-Mok,Kim, Dong American Astronomical Society 2019 The Astronomical journal Vol.157 No.2
Kim, Ji-Hoon,Song, Chang Eun,Kim, Hee Un,Grimsdale, Andrew C.,Moon, Sang-Jin,Shin, Won Suk,Choi, Si Kyung,Hwang, Do-Hoon American Chemical Society 2013 Chemistry of materials Vol.25 No.13
<P>Two donor–acceptor (D–A) copolymers, based on the donor unit TIPS substituted benzodithiophene (TIPSBDT) and the acceptor quinoxaline-based units with or without fluorine substitution (PTIPSBDT-DTQX and PTIPSBDT-DFDTQX), were designed and synthesized as a donor material for bulk-heterojunction (BHJ) photovoltaic cells. The introduction of F atoms with high electron affinity to be quinoxailine moieties is effective in further lowering both the HOMO and LUMO energy levels of PTIPSBDT-DFDTQX to attain higher open-circuit voltage (<I>V</I><SUB>oc</SUB>). Single junction photovoltaic cells were fabricated, and the polymers:PC<SUB>71</SUB>BM active layer morphology was optimized by adding 1,8-diiodooctane (DIO) as an additive. In a single layer photovoltaic device, they showed power conversion efficiencies (PCEs) of 2–6%. The solution process inverted tandem photovoltaic cells, in which two photovoltaic cells with different absorption characteristics are linked to use a wider range of the solar spectrum, were fabricated with each layer processed from solution with the use of BHJ materials comprising semiconducting polymers and fullerene derivatives. We first report here on the design of PTIPSBDT-DFDTQX equivalent poly(3-hexylthiophene), the current medium band gap polymer of choice, which thus is a viable candidate for use in the highly efficient bottom layer in inverted tandem cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2013/cmatex.2013.25.issue-13/cm401527b/production/images/medium/cm-2013-01527b_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm401527b'>ACS Electronic Supporting Info</A></P>
KMT-2016-BLG-1107: A New Hollywood-planet Close/Wide Degeneracy
Hwang, Kyu-Ha,Ryu, Yoon-Hyun,Kim, Hyoun-Woo,Albrow, Michael D.,Chung, Sun-Ju,Gould, Andrew,Han, Cheongho,Jung, Youn Kil,Shin, In-Gu,Shvartzvald, Yossi,Yee, Jennifer C.,Zang, Weicheng,Cha, Sang-Mok,Kim American Astronomical Society 2019 The Astronomical journal Vol.157 No.1