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Measurement of two-particle correlations with respect to second- and third-order event planes in Au+Au collisions at √sNN = 200 GeV

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arXiv 2018年

作者： Adare, A. Afanasiev, S. Aidala, C. Ajitanand, N.N. Akiba, Y. Al-Bataineh, H. Alexander, J. Alfred, M. Aoki, K. Aramaki, Y. Atomssa, E.T. Averbeck, R. Awes, T.C. Azmoun, B. Babintsev, V. Bagoly, A. Bai, M. Baksay, G. Baksay, L. Barish, K.N. Bassalleck, B. Basye, A.T. Bathe, S. Baublis, V. Baumann, C. Bazilevsky, A. Belikov, S. Belmont, R. Bennett, R. Berdnikov, A. Berdnikov, Y. Bickley, A.A. Boer, M. Bok, J.S. Boyle, K. Brooks, M.L. Bryslawskyj, J. Buesching, H. Bumazhnov, V. Bunce, G. Butsyk, S. Camacho, C.M. Campbell, S. Roman, V. Canoa Chen, C.-H. Chi, C.Y. Chiu, M. Choi, I.J. Choudhury, R.K. Christiansen, P. Chujo, T. Chung, P. Chvala, O. Cianciolo, V. Citron, Z. Cole, B.A. Connors, M. Constantin, P. Csanád, M. Csörgő, T. Dahms, T. Dairaku, S. Danchev, I. Danley, T.W. Das, K. Datta, A. David, G. Dehmelt, K. Denisov, A. Deshpande, A. Desmond, E.J. Dietzsch, O. Dion, A. Do, J.H. Donadelli, M. Drapier, O. Drees, A. Drees, K.A. Durham, J.M. Durum, A. Dutta, D. Edwards, S. Efremenko, Y.V. Ellinghaus, F. Engelmore, T. Enokizono, A. En’yo, H. Esumi, S. Fadem, B. Fan, W. Feege, N. Fields, D.E. Finger, M. Finger, M. Fleuret, F. Fokin, S.L. Fraenkel, Z. Frantz, J.E. Franz, A. Frawley, A.D. Fujiwara, K. Fukao, Y. Fusayasu, T. Gallus, P. Garg, P. Garishvili, I. Ge, H. Glenn, A. Gong, H. Gonin, M. Goto, Y. de Cassagnac, R. Granier Grau, N. Greene, S.V. Perdekamp, M. Grosse Gunji, T. Gustafsson, H.-Å. Hachiya, T. Haggerty, J.S. Hahn, K.I. Hamagaki, H. Hamblen, J. Han, R. Hanks, J. Hartouni, E.P. Hasegawa, S. Haseler, T.O.S. Haslum, E. Hayano, R. He, X. Heffner, M. Hemmick, T.K. Hester, T. Hill, J.C. Hill, K. Hodges, A. Hohlmann, M. Holzmann, W. Homma, K. Hong, B. Horaguchi, T. Hornback, D. Hotvedt, N. Huang, J. Huang, S. Ichihara, T. Ichimiya, R. Ide, J. Ikeda, Y. Imai, K. Inaba, M. Isenhower, D. Ishihara, M. Isobe, T. Issah, M. Isupov, A. Ivanishchev, D. Jacak, B.V. Abilene Christian University AbileneTX79699 United States Department of Physics Augustana University Sioux FallsSD57197 United States Department of Physics Banaras Hindu University Varanasi221005 India Bhabha Atomic Research Centre Bombay400 085 India Baruch College City University of New York New YorkNY10010 United States Collider-Accelerator Department Brookhaven National Laboratory UptonNY11973-5000 United States Physics Department Brookhaven National Laboratory UptonNY11973-5000 United States University of California-Riverside RiversideCA92521 United States Charles University Ovocný trh 5 Praha 1 Prague116 36 Czech Republic Chonbuk National University Jeonju561-756 Korea Republic of Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan University of Colorado BoulderCO80309 United States Columbia University New York New York 10027 Nevis Laboratories IrvingtonNY10533 United States Czech Technical University Zikova 4 Prague 6166 36 Czech Republic Dapnia CEA Saclay Gif-sur-YvetteF-91191 France Debrecen University H-4010 Debrecen Egyetem tér 1 Hungary ELTE Eötvös Loránd University Budapest Pázmány P. s. 1/AH-1117 Hungary Eszterházy Károly University Károly Róbert Campus Mátrai út 36 GyöngyösH-3200 Hungary Ewha Womans University Seoul120-750 Korea Republic of Florida Institute of Technology MelbourneFL32901 United States Florida State University TallahasseeFL32306 United States Georgia State University AtlantaGA30303 United States Hiroshima University Kagamiyama Higashi-Hiroshima739-8526 Japan Department of Physics and Astronomy Howard University WashingtonDC20059 United States IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino142281 Russia University of Illinois at Urbana-Champaign UrbanaIL

We present measurements of azimuthal correlations of charged hadron pairs in √sNN = 200 GeV Au+Au collisions for the trigger and associated particle transverse-momentum ranges of (Formula presented). After subtraction of an underlying event using a model that includes higher-order azimuthal anisotropy v2, v3, and v4, the away-side yield of the highest trigger-pT (Formula presented) correlations is suppressed compared to that of correlations measured in p+p collisions. At the lowest associated particle (Formula presented), the away-side shape and yield are modified relative to those in p+p collisions. These observations are consistent with the scenario of radiative-jet energy loss. For the low-pT trigger correlations (Formula presented), a finite away-side yield exists and we explore the dependence of the shape of the away-side within the context of an underlying-event model. Correlations are also studied differentially versus event-plane angle Ψ2 and Ψ3. The angular correlations show an asymmetry when selecting the sign of the difference between the trigger-particle azimuthal angle and the Ψ2 event plane. This asymmetry and the measured suppression of the pair yield out of plane is consistent with a path-length-dependent energy loss. No Ψ3 dependence can be resolved within experimental uncertainties. Copyright © 2018, The Authors. All rights reserved.

关键词： Energy dissipation

Stellar & planetary parameters for K2’S late type dwarf systems from C1 TO C5

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arXiv 2017年

作者： Martinez, Arturo O. Crossfield, Ian J.M. Schlieder, Joshua E. Dressing, Courtney D. Obermeier, Christian Livingston, John Ciceri, Simona Peacock, Sarah Beichman, Charles A. Lépine, Sébastien Aller, Kimberly M. Chance, Quadry A. Petigura, Erik A. Howard, Andrew W. Werner, Michael W. Department of Astronomy San Diego State University 5500 Campanile Drive San DiegoCA United States Department of Physics and Astronomy Georgia State University GA United States Steward Observatory University of Arizona TucsonAZ United States Lunar & Planetary Laboratory University of Arizona TucsonAZ United States Astronomy and Astrophysics Department UC Santa Cruz Santa CruzCA United States NASA NASA Ames Research Center Moffett FieldCA United States NASA Exoplanet Science Institute California Institute of Technology PasadenaCA United States NASA Postdoctoral Program Division of Geological and Planetary Sciences California Institute of Technology PasadenaCA United States Max Planck Institut für Astronomie Heidelberg Germany Max-Planck-Institute for Extraterrestrial Physics Garching Germany Department of Astronomy Graduate School of Science University of Tokyo 7-3-1 Bunkyo-ku Tokyo113- 0033 Japan Department of Astronomy Stockholm University StockholmSE-106 91 Sweden Institute for Astronomy University of Hawai’i at Mānoa HonoluluHI United States Steward Observatory University of Arizona TucsonAZ United States Hubble Department of Astronomy California Institute of Technology PasadenaCA91125 United States Jet Propulsion Laboratory PasadenaCA United States

The NASA K2 mission uses photometry to find planets transiting stars of various types. M dwarfs are of high interest since they host more short-period planets than any other type of main-sequence stars and transiting planets around M dwarfs have deeper transits compared to other main-sequence stars. In this paper, we present stellar parameters from K and M dwarfs hosting transiting planet candidates discovered by our team. Using the SOFI spectrograph on the European Southern Observatory’s New Technology Telescope, we obtained R ≈ 1000 J-, H-, and K-band (0.95 - 2.52 µm) spectra of 34 late-type K2 planet and candidate planet host systems and 12 bright K4-M5 dwarfs with interferometrically measured radii and effective temperatures. Out of our 34 late-type K2 targets, we identify 27 of these stars as M dwarfs. We measure equivalent widths of spectral features, derive calibration relations using stars with interferometric measurements, and estimate stellar radii, effective temperatures, masses, and luminosities for the K2 planet hosts. Our calibrations provide radii and temperatures with median uncertainties of 0.059 Ro (16.09%) and 160 K (4.33%), respectively. We then reassess the radii and equilibrium temperatures of known and candidate planets based on our spectroscopically derived stellar parameters. Since a planet’s radius and equilibrium temperature depend on the parameters of its host star, our study provides more precise planetary parameters for planets and candidates orbiting late-type stars observed with K2. We find a median planet radius and an equilibrium temperature of approximately 3R⊕ and 500 K, respectively, with several systems (K2-18b and K2-72e) receiving near-Earth-like levels of incident irradiation. Copyright © 2017, The Authors. All rights reserved.

关键词： Planets

Control of the dipole layer of polar organic molecules adsorbed on metal surfaces via different charge-transfer channels

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Physical Review B 2017年第8期95卷 085425-085425页

作者： Meng-Kai Lin Yasuo Nakayama Ying-Jie Zhuang Kai-Jun Su Chin-Yung Wang Tun-Wen Pi Sebastian Metz Theodoros A. Papadopoulos T.-C. Chiang Hisao Ishii S.-J. Tang Department of Physics and Astronomy National Tsing Hua University Hsinchu Taiwan 30013 Republic of China Department of Pure and Applied Chemistry Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan National Synchrotron Radiation Research Center (NSRRC) Hsinchu Taiwan 30076 Republic of China Scientific Computing Department STFC Daresbury Laboratory Daresbury Warrington WA4 4AD United Kingdom Department of Natural Sciences University of Chester Thornton Science Park Chester CH2 4NU United Kingdom Department of Physics University of Illinois at Urbana-Champaign 1110 West Green Street Urbana Illinois 61801-3080 USA Graduate School of Advanced Integration Science Chiba University 1-33 Yayoi-cho Inage-ku Chiba 263-8522 Japan Center for Frontier Science Chiba University 1-33 Yayoi-cho Inage-ku 263-8522 Japan

Organic molecules with a permanent electric dipole moment have been widely used as a template for further growth of molecular layers in device structures. Key properties of the resulting organic films such as energy level alignment (ELA), work function, and injection/collection barrier are linked to the magnitude and direction of the dipole moment at the interface. Using angle-resolved photoemission spectroscopy (ARPES), we have systematically investigated the coverage-dependent work function and spectral line shapes of occupied molecular energy states (MESs) of chloroaluminium-phthalocyanine (ClAlPc) grown on Ag(111). We demonstrate that the dipole orientation of the first ClAlPc layer can be controlled by adjusting the deposition rate and postannealing conditions, and we find that the ELA at the interface differs by ∼0.4eV between the Cl up and down configurations of the adsorbed ClAlPc molecules. These observations are rationalized by density functional theory (DFT) calculations based on a realistic model of the ClAlPc/Ag(111) interface, which reveal that the different orientations of the ClAlPc dipole layer lead to different charge-transfer channels between the adsorbed ClAlPc and Ag(111) substrate. Our findings provide a useful framework toward method development for ELA tuning.

关键词： Adsorption Electronic structure Electronic structure of atoms & molecules Angle-resolved photoemission spectroscopy Density functional theory

The Effects of Chemical Fixation on the Cellular Nanostructure: A Correlative Study of Back-Scattered Interference Spectrometry Microscopy and TEM

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Microscopy and Microanalysis 2016年第S3期22卷 234-235页

作者： Yue Li Luay Almassalha John Chandler Yolanda Cyrus Reiner Bleher Hariharan Subramanian Igal Szleifer Vadim Backman Vinayak Dravid Applied Physics Program Northwestern University Interdisciplinary Biological Sciences Graduate Program Northwestern University Biomedical Engineering Department Northwestern University Materials Sciences and Engineering Department Northwestern University Chemistry of Life Processes Institute Northwestern University

Significantly high polarization degree of the very low-albedo asteroid (152679) 1998 KU2

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arXiv 2017年

作者： Kuroda, Daisuke Ishiguro, Masateru Watanabe, Makoto Hasegawa, Sunao Sekiguchi, Tomohiko Naito, Hiroyuki Usui, Fumihiko Imai, Masataka Sato, Mitsuteru Kuramoto, Kiyoshi Okayama Astrophysical Observatory National Astronomical Observatory of Japan Asakuchi Okayama719-0232 Japan Department of Physics and Astronomy Seoul National University Gwanak Seoul151-742 Korea Republic of Department of Applied Physics Okayama University of Science Ridai-cho Kita-ku Okayama Okayama700-0005 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Kanagawa252-5210 Japan Asahikawa Campus Hokkaido University of Education Hokumon Asahikawa Hokkaido070-8621 Japan Nayoro Observatory Nisshin Nayoro Hokkaido096-0066 Japan Center for Planetary Science Graduate School of Science Kobe University Minatojima-Minamimachi Chuo-Ku Kobe Hyogo650-0047 Japan Department of Cosmosciences Graduate School of Science Hokkaido University Kita-ku Sapporo Hokkaido060-0810 Japan

We present a unique and significant polarimetric result regarding the near-Earth asteroid (152679) 1998 KU2, which has a very low geometric albedo. From our observations, we find that the linear polarization degrees of 1998 KU2are 44.6 ± 0.5% in the RC band and 44.0 ± 0.6% in the V band at a solar phase angle of 81.0°. These values are the highest of any known airless body in the solar system (i.e., high-polarization comets, asteroids, and planetary satellites) at similar phase angles. This polarimetric observation is not only the first for primitive asteroids at large phase angles, but also for low-albedo (2has a highly microporous regolith structure comprising nano-sized carbon grains on the surface. Copyright © 2017, The Authors. All rights reserved.

关键词： Polarization

ALMA 12CO (J=1–0) imaging of the nearby galaxy M83: Variations in the efficiency of star formation in giant molecular clouds

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arXiv 2018年

作者： Hirota, Akihiko Egusa, Fumi Baba, Junichi Kuno, Nario Muraoka, Kazuyuki Tosaki, Tomoka Miura, Rie Nakanishi, Hiroyuki Kawabe, Ryohei National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Joint ALMA Observatory Alonso de Córdova 3107 Vitacura Santiago763-0355 Chile Institute of Space and Astronautical Science Japan Aerospace Exploration Agency SagamiharaKanagawa252-5210 Japan Earth-Life Science Institute Tokyo Institute of Technology 2-12-1 Ookayama Meguro Tokyo152-8551 Japan Division of Physics Faculty of Pure and Applied Sciences University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki305-8571 Japan Tomonaga Center for the History of the Universe University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki305-8571 Japan Department of Physical Science Graduate School of Science Osaka Prefecture University 1-1 Gakuen-cho Naka-ku Sakai599-8531 Japan Joetsu University of Education Yamayashiki-machi Joetsu Niigata943-8512 Japan Graduate School of Science and Engineering Kagoshima University 1-21-35 Korimoto Kagoshima Kagoshima890-0065 Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Astronomy School of Science University of Tokyo Bunkyo Tokyo113-0033 Japan

We present results of the 12CO (1–0) mosaic observations of the nearby barred-spiral galaxy M83 obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). The total flux is recovered by combining the ALMA data with single-dish data obtained using the Nobeyama 45-m telescope. The combined map covers a ~13 kpc2 field that includes the galactic center, eastern bar, and spiral arm with a resolution of 2.´´03 × 1.´´15 (~ 45 pc × ~ 25 pc). With a resolution comparable to typical sizes of giant molecular clouds (GMCs), the CO distribution in the bar and arm is resolved into many clumpy peaks that form ridge-like structures. Remarkably, in the eastern arm, the CO peaks form two arc-shaped ridges that run along the arm and exhibit a distinct difference in the activity of star formation: the one on the leading side has numerous H II regions associated with it, whereas the other one on the trailing side has only a few. To see whether GMCs form stars with uniform star formation efficiency (SFE) per free-fall time (SFEff), GMCs are identified from the data cube and then cross-matched with the catalog of HII regions to estimate the star formation rate for each of them. 179 GMCs with a median mass of 1.6 × 106 M☉ are identified. The mass-weighted average SFEff of the GMCs is ~9.4 × 10−3, which is in agreement with models of turbulence regulated star formation. Meanwhile, we find that SFEff is not universal within the mapped region. In particular, one of the arm ridges shows a high SFEff with a mass-weighted value of ~ 2.7 × 10−2, which is higher by more than a factor of 5 compared to the inter-arm regions. This large regional variation in SFEff favors the recent interpretation that GMCs do not form stars at a constant rate within their lifetime. Copyright © 2018, The Authors. All rights reserved.

关键词： Efficiency

Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions

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arXiv 2018年

作者： Adare, A. Afanasiev, S. Aidala, C. Ajitanand, N.N. Akiba, Y. Akimoto, R. Al-Bataineh, H. Alexander, J. Alfred, M. Al-Jamel, A. Al-Ta'ani, H. Angerami, A. Aoki, K. Apadula, N. Aphecetche, L. Aramaki, Y. Armendariz, R. Aronson, S.H. Asai, J. Asano, H. Aschenauer, E.C. Atomssa, E.T. Averbeck, R. Awes, T.C. Azmoun, B. Babintsev, V. Bagoly, A. Bai, M. Baksay, G. Baksay, L. Baldisseri, A. Bannier, B. Barish, K.N. Barnes, P.D. Bassalleck, B. Basye, A.T. Bathe, S. Batsouli, S. Baublis, V. Bauer, F. Baumann, C. Baumgart, S. Bazilevsky, A. Belikov, S. Belmont, R. Bennett, R. Berdnikov, A. Berdnikov, Y. Bhom, J.H. Bickley, A.A. Bjorndal, M.T. Blau, D.S. Boer, M. Boissevain, J.G. Bok, J.S. Borel, H. Boyle, K. Brooks, M.L. Brown, D.S. Bryslawskyj, J. Bryslawskyj, J. Bucher, D. Buesching, H. Bumazhnov, V. Bunce, G. Burward-Hoy, J.M. Butsyk, S. Camacho, C.M. Campbell, S. Canoa Roman, V. Caringi, A. Castera, P. Chai, J.-S. Chang, B.S. Chang, W.C. Charvet, J.-L. Chen, C.-H. Chernichenko, S. Chi, C.Y. Chiba, J. Chiu, M. Choi, I.J. Choi, J.B. Choi, S. Choudhury, R.K. Christiansen, P. Chujo, T. Chung, P. Churyn, A. Chvala, O. Cianciolo, V. Citron, Z. Cleven, C.R. Cobigo, Y. Cole, B.A. Comets, M.P. Conesa del Valle, Z. Connors, M. Constantin, P. Csanád, M. Csörgo, T. Dahms, T. Dairaku, S. Danchev, I. Danley, T.W. Das, K. Datta, A. Daugherity, M.S. David, G. Dayananda, M.K. Deaton, M.B. Dehmelt, K. Delagrange, H. Denisov, A. D'Enterria, D. Deshpande, A. Desmond, E.J. Dharmawardane, K.V. Dietzsch, O. Ding, L. Dion, A. Do, J.H. Donadelli, M. D'Orazio, L. Drachenberg, J.L. Drapier, O. Drees, A. Drees, K.A. Dubey, A.K. Durham, J.M. Durum, A. Dutta, D. Dzhordzhadze, V. Edwards, S. Efremenko, Y.V. Egdemir, J. Ellinghaus, F. Emam, W.S. Engelmore, T. Enokizono, A. En'yo, H. Espagnon, B. Esumi, S. Eyser, K.O. Fadem, B. Fan, W. Feege, N. Fields, D.E. Finger, M. Finger, M. Fleuret, F. Fokin, S.L. Forestier, B. Abilene Christian University AbileneTX79699 United States Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Augustana University Sioux FallsSD57197 United States Department of Physics Banaras Hindu University Varanasi221005 India Bhabha Atomic Research Centre Bombay400 085 India Baruch College City University of New York New YorkNY10010 United States Collider-Accelerator Department Brookhaven National Laboratory UptonNY11973-5000 United States Physics Department Brookhaven National Laboratory UptonNY11973-5000 United States University of California-Riverside RiversideCA92521 United States Charles University Ovocný trh 5 Praha 1 Prague116 36 Czech Republic Chonbuk National University Jeonju561-756 Korea Republic of Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan University of Colorado BoulderCO80309 United States Columbia University New YorkNY10027 United States Nevis Laboratories IrvingtonNY10533 United States Czech Technical University Zikova 4 Prague 6166 36 Czech Republic Dapnia CEA Saclay Gif-sur-YvetteF-91191 France Debrecen University Egyetem tér 1 DebrecenH-4010 Hungary ELTE Eötvös Loránd University Pázmány P. s. 1/A BudapestH-1117 Hungary Eszterházy Károly University Károly Róbert Campus Mátrai út 36 GyöngyösH-3200 Hungary Ewha Womans University Seoul120-750 Korea Republic of Florida Institute of Technology MelbourneFL32901 United States Florida State University TallahasseeFL32306 United States Georgia State University AtlantaGA30303 United States Hanyang University Seoul133-792 Korea Republic of Hiroshima University Kagamiyama Higashi-Hiroshima739-8526 Japan Department of Physics and Astronomy Howard University WashingtonDC20059 United States IHEP Protvino State Research Center of Russian Fede

The PHENIX collaboration presents first measurements of low-momentum (0.4 √sNN =39 and 62.4 GeV. For both beam energies the direct-photon yields are substantially enhanced with respect to expectations from prompt processes, similar to the yields observed in Au+Au collisions at √sNN =200. Analyzing the photon yield as a function of the experimental observable dNch/dη reveals that the low-momentum (>1 GeV/c) direct-photon yield dNγdir/dη is a smooth function of dNch/dη and can be well described as proportional to (dNch/dη)α with α∼1.25. This new scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and Large Hadron Collider, for centrality selected samples, as well as for different, A+A collision systems. At a given beam energy the scaling also holds for high pT (> 5 GeV/c) but when results from different collision energies are compared, an additional √sNN -dependent multiplicative factor is needed to describe the integrated-direct-photon yield. Copyright © 2018, The Authors. All rights reserved.

关键词： Germanium alloys

Long-range attraction of particles adhered to lipid vesicles

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Physical Review E 2016年第1期94卷 012604-012604页

作者： Raphael Sarfati Eric R. Dufresne Department of Applied Physics and Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06511 USA Department of Materials ETH Zürich 8092 Zürich Switzerland and School of Engineering and Applied Sciences Yale University New Haven Connecticut 06511 USA

Many biological systems fold thin sheets of lipid membrane into complex three-dimensional structures. This microscopic origami is often mediated by the adsorption and self-assembly of proteins on a membrane. As a model system to study adsorption-mediated interactions, we study the collective behavior of micrometric particles adhered to a lipid vesicle. We estimate the colloidal interactions using a maximum likelihood analysis of particle trajectories. When the particles are highly wrapped by a tense membrane, we observe strong long-range attractions with a typical binding energy of 150kBT and significant forces extending a few microns.

关键词： Brownian motion Membranes Colloids Lipids

Point source classification on astronomical photometric images using artificial neural network

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Journal of physics: Conference Series 2018年第1期1144卷

作者： R Yoyponsan U Sawangwit S Komonjinda Graduate Program in Astronomy Faculty of Science Chiang Mai University 239 Huay Kaew Road Muang District Chiang Mai Thailand 50200. National Astronomical Research Institute of Thailand (Public Organization) 260 Moo 4 Mae Rim District Chiang Mai Thailand 50180. Department of Physics and Materials Science Faculty of Science Chiang Mai University 239 Huay Kaew Road Muang District Chiang Mai Thailand 50200.

Gravitational-wave Optical Transient Observer (GOTO) is a set of telescopes primarily for optical follow-up observation of gravitational wave. It is designed to have as much sky coverage as 18 square-degree per pointing. This property allows the telescopes to compensate for an area of uncertainty produced by gravitational wave detector such as LIGO. The secondary objective of GOTO is to perform an all-sky survey. Each night, it could cover as much as 2700 square-degree. Such large area of observation produces as large number of objects. It was estimated to be able to collect 12 million objects per night. Processing such quantity of data manually is extremely difficult. One of the most challenging task is to perform object classification. A solution to this problem is to have machine perform classification, which is possible via machine learning algorithm. In this work, we use supervise machine learning performed on simulated data to create a point source classifier. We will focus on application and performance of artificial neural network in the work.

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