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Corrigendum to “Single-walled carbon nanotube membranes for optical applications in the extreme ultraviolet rang” [155, (2019) 734–739]

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Carbon 2020年 156卷 576-576页

作者： V.M. Gubarev V.Y. Yakovlev M.G. Sertsu O.F. Yakushev V.M. Krivtsun Yu G. Gladush I.A. Ostanin A. Sokolov F. Schäfers V.V. Medvedev A.G. Nasibulin Moscow Institute of Physics and Technology (State University) Institutskiy pereulok str. 9 Dolgoprudny Moscow Region 141701 Russia Skolkovo Institute of Science and Technology Nobel str. 3 Moscow 121205 Russia Helmholtz Zentrum Berlin (BESSY-II) Albert-Einstein-Strasse 15 D-12489 Berlin Germany P. N. Lebedev Physical Institute of the Russian Academy of Science Moscow Russia Institute for Spectroscopy of the Russian Academy of Science Moscow Troitsk Russia Faculty of Physics Higher School of Economics Old Basmannya 21/4 Moscow Russia Center for Computational and Data-Intensive Science and Engineering Skolkovo Institute of Science and Technology Moscow Russia Multi-Scale Mechanics (MSM) Faculty of Engineering Technology MESA+ University of Twente Enschede the Netherlands Department of Applied Physics Aalto University 15100 FI-00076 Aalto Finland

AGC 226178 and NGVS 3543: Two deceptive dwarfs towards Virgo

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arXiv 2021年

作者： Jones, Michael G. Sand, David J. Bellazzini, Michele Spekkens, Kristine Cannon, John M. Mutlu-Pakdil, Burçin Karunakaran, Ananthan Beccari, Giacomo Magrini, Laura Cresci, Giovanni Inoue, John L. Fuson, Jackson Adams, Elizabeth A.K. Battaglia, Giuseppina Bennet, Paul Crnojević, Denija Caldwell, Nelson Guhathakurta, Puragra Haynes, Martha P. Muñoz, Ricardo R. Seth, Anil Strader, Jay Toloba, Elisa Zaritsky, Dennis Steward Observatory University of Arizona 933 North Cherry Avenue Rm. N204 TucsonAZ85721-0065 United States INAF Osservatorio di Astrofisica e Scienza dello Spazio di Bologna Via Gobetti 93/3 Bologna40129 Italy Department of Physics and Space Science Royal Military College of Canada P.O. Box 17000 Station Forces Kingston ONK7K 7B4 Canada Department of Physics Engineering Physics and Astronomy Queen’s University KingstonONK7L 3N6 Canada Department of Physics & Astronomy Macalester College 1600 Grand Avenue Saint PaulMN55105 United States Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Department of Astronomy and Astrophysics University of Chicago ChicagoIL60637 United States Glorieta de la Astronomía Granada18008 Spain European Southern Observatory Karl-Schwarzschild-Strasse 2 Garching bei MünchenD-85748 Germany INAF - Osservatorio Astrofisico di Arcetri Largo E. Fermi 5 Firenze50125 Italy ASTRON the Netherlands Institute for Radio Astronomy Oude Hoogeveesedijk 4 Dwingeloo7991 PD Netherlands Kapteyn Astronomical Institute PO Box 800 Groningen9700 AV Netherlands Instituto de Astrofísica de Canarias Vía Láctea s/n La Laguna38205 Spain Universidad de La Laguna Avda. Astrofísico Fco. Sánchez Tenerife La LagunaE-38205 Spain Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States University of Tampa 401 West Kennedy Boulevard TampaFL33606 United States Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States UCO/Lick Observatory University of California Santa Cruz 1156 High Street Santa CruzCA95064 United States Cornell Center for Astrophysics and Planetary Science Space Sciences Building Cornell University IthacaNY14853 United States Departamento de Astronomía Universidad de Chile Camino El Observatorio 1515 Las Condes Santiago Chile Department of Physics & Astronomy University of Utah Salt Lake CityUT8

The two sources AGC 226178 and NGVS 3543, an extremely faint, clumpy, blue stellar system and a low surface brightness dwarf spheroidal, are adjacent systems in the direction of the Virgo cluster. Both have been studied in detail previously, with it being suggested that they are unrelated normal dwarf galaxies or that NGVS 3543 recently lost its gas through ram pressure stripping, and that AGC 226178 formed from this stripped gas. However, with Hubble Space Telescope Advanced Camera for Surveys imaging we demonstrate that the stellar population of NGVS 3543 is inconsistent with being at the distance of the Virgo cluster, and that it is likely a foreground object at approximately 10 Mpc. Whereas the stellar population of AGC 226178 is consistent with it being a very young (10-100 Myr) object in the Virgo cluster. Through a re-analysis of the original ALFALFA H i detection we show that AGC 226178 likely formed from gas stripped from the nearby dwarf galaxy VCC 2034, a hypothesis strengthened by the high metallicity measured with MUSE VLT observations. However, it is unclear whether ram pressure or a tidal interaction is responsible for stripping the gas. AGC 226178 is one of at least five similar objects now known towards Virgo. These objects are all young and unlikely to remain visible for over ∼500 Myr, suggesting that they are continually produced in the cluster. © 2021, CC BY.

关键词： Galaxies

AA-ICP: Iterative closest point with anderson acceleration

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arXiv 2017年

作者： Pavlov, A.L. Ovchinnikov, G.V. Derbyshev, D.Yu. Tsetserukou, D. Oseledets, I.V. Space Center Skolkovo Institute of Science and Technology Skolkovo Innovation Center Moscow143026 Russia Center for Computational and Data-Intensive Science and Engineering Skolkovo Institute of Science and Technology Moscow Institute of Physics and Technology Space Center Skolkovo Institute of Science and Technology

Iterative Closest Point (ICP) is a widely used method for performing scan-matching and registration. Being simple and robust method, it is still computationally expensive and may be challenging to use in real-time applications with limited resources on mobile platforms. In this paper we propose novel effective method for acceleration of ICP which does not require substantial modifications to the existing code. This method is based on an idea of Anderson acceleration which is an iterative procedure for finding a fixed point of contractive mapping. The latter is often faster than a standard Picard iteration, usually used in ICP implementations. We show that ICP, being a fixed point problem, can be significantly accelerated by this method enhanced by heuristics to improve overall robustness. We implement proposed approach into Point Cloud Library (PCL) and make it available online. Benchmarking on real-world data fully supports our claims. Copyright © 2017, The Authors. All rights reserved.

关键词： Heuristic methods

New ASKAP Radio Supernova Remnants and Candidates in the Large Magellanic Cloud

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arXiv 2022年

作者： Bozzetto, Luke M. Filipović, Miroslav D. Sano, H. Alsaberi, R.Z.E. Barnes, L.A. Bojičić, I.S. Brose, R. Chomiuk, L. Crawford, Evan J. Dai, S. Ghavam, M. Haberl, F. Hill, T. Hopkins, A.M. Ingallinera, A. Jarrett, T. Kavanagh, P.J. Koribalski, B.S. Kothes, R. Leahy, D. Lenc, E. Leonidaki, I. Maggi, P. Maitra, C. Matthew, C. Payne, J.L. Pennock, C.M. Points, S. Reid, W. Riggi, S. Rowell, G. Sasaki, M. Safi-Harb, S. van Loon, J.Th. Tothill, N.F.H. Urošević, D. Zangrandi, F. Western Sydney University Locked Bag 1797 DC South PenrithNSW2751 Australia Faculty of Engineering Gifu University 1-1 Yanagido Gifu501-1193 Japan Dublin Institute for Advanced Studies Astronomy & Astrophysics Section 31 Fitzwilliam Place D02 XF86 Dublin 2 Ireland Center for Data Intensive and Time Domain Astronomy Department of Physics and Astronomy Michigan State University East LansingMI48824 United States Max-Planck-Institut für extraterrestrische Physik Gießenbachstraße 1 GarchingD-85748 Germany Australian Astronomical Optics AAO-Macquarie Faculty of Science and Engineering Macquarie University 105 Delhi Rd North RydeNSW2113 Australia INAF – Osservatorio Astrofisico di Catania via Santa Sofia 78 CataniaI-95123 Italy Department of Astronomy University of Cape Town Rondebosch7701 South Africa School of Cosmic Physics Dublin Institute for Advanced Studies 31 Fitzwilliam Place Dublin 2 Ireland ATNF CSIRO Space & Astronomy PO Box 76 EppingNSW1710 Australia Dominion Radio Astrophysical Observatory Herzberg Astronomy and Astrophysics National Research Council Canada PO Box 248 PentictonBCV2A 6J9 Canada Department of Physics and Astronomy University of Calgary University of Calgary CalgaryABT2N 1N4 Canada Department of Physics University of Crete HeraklionGR-70013 Greece Institute of Astrophysics FORTH HeraklionGR-71110 Greece Observatoire Astronomique de Strasbourg Université de Strasbourg CNRS 11 rue de l’Université StrasbourgF-67000 France Lennard-Jones Laboratories Keele University StaffordshireST5 5BG United Kingdom Cerro Tololo Inter-American Observatory NSF’s NOIRLab Casilla 603 La Serena Chile Observatory Hill Waitoki 130 Dormer Rd Helensville RD2 Auckland0875 New Zealand School of Mathematical and Physical Sciences Macquarie University SydneyNSW2109 Australia School of Physical Sciences The University of Adelaide Adelaide5005 Australia Dr. Karl Remeis Observatory Erlangen Centre for Astroparticle Physics

We present a new Australian Square Kilometre Array Pathfinder (ASKAP) sample of 14 radio Supernova Remnant (SNR) candidates in the Large Magellanic Cloud (LMC). This new sample is a significant increase to the known number of older, larger and low surface brightness LMC SNRs. We employ a multi-frequency search for each object and found possible traces of optical and occasionally X-ray emission in several of these 14 SNR candidates. One of these 14 SNR candidates (MCSNR J0522–6543) has multi-frequency properties that strongly indicate a bona fide SNR. We also investigate a sample of 20 previously suggested LMC SNR candidates and confirm the SNR nature of MCSNR J0506–6815. We detect lower surface brightness SNR candidates which were likely formed by a combination of shock waves and strong stellar winds from massive progenitors (and possibly surrounding OB stars). Some of our new SNR candidates are also found in a lower density environments in which SNe type Ia explode inside a previously excavated interstellar medium (ISM). Copyright © 2022, The Authors. All rights reserved.

关键词： Shock waves

Strong Carbon Features and a Red Early Color in the Underluminous Type Ia SN 2022xkq

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arXiv 2023年

作者： Pearson, Jeniveve Sand, David J. Lundqvist, Peter Galbany, Lluís Andrews, Jennifer E. Bostroem, K. Azalee Dong, Yize Hoang, Emily Hosseinzadeh, Griffin Janzen, Daryl Jencson, Jacob E. Lundquist, Michael J. Mehta, Darshana Retamal, Nicolás Meza Shrestha, Manisha Valenti, Stefano Wyatt, Samuel Anderson, Joseph P. Ashall, Chris Auchettl, Katie Baron, Eddie Blondin, Stéphane Burns, Christopher R. Cai, Yongzhi Chen, Ting-Wan Chomiuk, Laura Coulter, David A. Cross, Dane Davis, Kyle W. de Jaeger, Thomas DerKacy, James M. Desai, Dhvanil D. Dimitriadis, Georgios Do, Aaron Farah, Joseph R. Foley, Ryan J. Gromadzki, Mariusz Gutiérrez, Claudia P. Haislip, Joshua González Hernández, Jonay I. Hinkle, Jason T. Hoogendam, Willem B. Howell, D. Andrew Hoeflich, Peter Hsiao, Eric Huber, Mark E. Jha, Saurabh W. Palau, Cristina Jiménez Kilpatrick, Charles D. Kouprianov, Vladimir Kumar, Sahana Kwok, Lindsey A. Larison, Conor LeBaron, Natalie Le Saux, Xavier Lu, Jing McCully, Curtis Evans, Tycho Mera Milne, Peter Modjaz, Maryam Morrell, Nidia Müller-Bravo, Tomás E. Newsome, Megan Nicholl, Matt Gonzalez, Estefania Padilla Payne, Anna V. Pellegrino, Craig Phan, Kim Pineda-García, Jonathan Piro, Anthony L. Piscarreta, Lara Polin, Abigail Reichart, Daniel E. Rojas-Bravo, César Ryder, Stuart D. Salmaso, Irene Schwab, Michaela Shahbandeh, Melissa Shappee, Benjamin J. Siebert, Matthew R. Smith, Nathan Strader, Jay Taggart, Kirsty Terreran, Giacomo Tinyanont, Samaporn Tucker, M.A. Valerin, Giorgio Young, D.R. Steward Observatory University of Arizona 933 North Cherry Avenue TucsonAZ85721-0065 United States Oskar Klein Centre Department of Astronomy Stockholm University Albanova University Centre StockholmSE-106 91 Sweden Campus UAB Carrer de Can Magrans s/n BarcelonaE-08193 Spain Institut d’Estudis Espacials de Catalunya Gran Capità 2-4 Edifici Nexus Desp. 201 BarcelonaE-08034 Spain Gemini Observatory 670 North A‘ohoku Place HiloHI96720-2700 United States Department of Physics and Astronomy University of California Davis 1 Shields Avenue DavisCA95616-5270 United States Department of Physics & Engineering Physics University of Saskatchewan 116 Science Place SaskatoonSKS7N 5E2 Canada Department of Physics and Astronomy The Johns Hopkins University 3400 North Charles Street BaltimoreMD21218 United States W. M. Keck Observatory 65-1120 Māmalahoa Highway KamuelaHI96743-8431 United States Department of Astronomy University of Washington 3910 15th Avenue NE SeattleWA98195-0002 United States European Southern Observatory Alonso de Córdova 3107 Casilla 19 Santiago Chile Millennium Institute of Astrophysics MAS Nuncio Monsenor Sotero Sanz 100 Off. 104 Providencia Santiago Chile Department of Physics Virginia Tech 850 West Campus Drive BlacksburgVA24061 United States School of Physics The University of Melbourne ParkvilleVIC3010 Australia Department of Astronomy and Astrophysics University of California Santa CruzCA95064-1077 United States Planetary Science Institute 1700 East Fort Lowell Road Suite 106 TucsonAZ85719-2395 United States Hamburger Sternwarte Gojenbergsweg 112 Hamburg21029 Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma 440 W. Brooks NormanOK73019-2061 United States Aix-Marseille Univ CNRS CNES LAM Marseille13388 France Observatories of the Carnegie Institute for Science 813 Santa Barbara Street PasadenaCA91101-1232 United States Yunnan Observatories Chinese Academy of

We present optical, infrared, ultraviolet, and radio observations of SN 2022xkq, an underluminous fast-declining type Ia supernova (SN Ia) in NGC 1784 (D ≈ 31 Mpc), from Copyright © 2023, The Authors. All rights... 详细信息

关键词： Explosions

The TESS Grand Unified Hot Jupiter Survey. II. Twenty New Giant Planets∗

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arXiv 2022年

作者： Yee, Samuel W. Winn, Joshua N. Hartman, Joel D. Bouma, Luke G. Zhou, George Quinn, Samuel N. Latham, David W. Bieryla, Allyson Rodriguez, Joseph E. Collins, Karen A. Alfaro, Owen Barkaoui, Khalid Beard, Corey Belinski, Alexander A. Benkhaldoun, Zouhair Benni, Paul Bernacki, Krzysztof Boyle, Andrew W. Butler, R. Paul Caldwell, Douglas A. Chontos, Ashley Christiansen, Jessie L. Ciardi, David R. Collins, Kevin I. Conti, Dennis M. Crane, Jeffrey D. Daylan, Tansu Dressing, Courtney D. Eastman, Jason D. Essack, Zahra Evans, Phil Everett, Mark E. Fajardo-Acosta, Sergio Forés-Toribio, Raquel Furlan, Elise Ghachoui, Mourad Gillon, Michaël Hellier, Coel Helm, Ian Howard, Andrew W. Howell, Steve B. Isaacson, Howard Jehin, Emmanuel Jenkins, Jon M. Jensen, Eric L.N. Kielkopf, John F. Laloum, Didier Leonhardes-Barboza, Naunet Lewin, Pablo Logsdon, Sarah E. Lubin, Jack Lund, Michael B. MacDougall, Mason G. Mann, Andrew W. Maslennikova, Natalia A. Massey, Bob McLeod, Kim K. Muñoz, Jose A. Newman, Patrick Orlov, Valeri Plavchan, Peter Popowicz, Adam Pozuelos, Francisco J. Pritchard, Tyler A. Radford, Don J. Reefe, Michael Ricker, George R. Rudat, Alexander Safonov, Boris S. Schwarz, Richard P. Schweiker, Heidi Scott, Nicholas J. Seager, S. Shectman, Stephen A. Stockdale, Chris Tan, Thiam-Guan Teske, Johanna K. Thomas, Neil B. Timmermans, Mathilde Vanderspek, Roland Vermilion, David Watanabe, David Weiss, Lauren M. West, Richard G. Van Zandt, Judah Zejmo, Michal Ziegler, Carl Department of Astrophysical Sciences Princeton University 4 Ivy Lane PrincetonNJ08544 United States Department of Astronomy California Institute of Technology PasadenaCA91125 United States University of Southern Queensland Centre for Astrophysics West Street ToowoombaQLD4350 Australia Center for Astrophysics Harvard & Smithsonian 60 Garden St CambridgeMA02138 United States Center for Data Intensive and Time Domain Astronomy Department of Physics and Astronomy Michigan State University East LansingMI48824 United States George Mason University 4400 University Drive FairfaxVA22030 United States Astrobiology Research Unit Université de Liège 19C Allée du 6 Août Liège4000 Belgium Department of Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology CambridgeMA02139 United States Tenerife La LagunaE-38205 Spain Department of Physics & Astronomy University of California Irvine IrvineCA92697 United States Sternberg Astronomical Institute M.V. Lomonosov Moscow State University 13 Universitetskij pr. Moscow119234 Russia Oukaimeden Observatory High Energy Physics and Astrophysics Laboratory Faculty of sciences Semlalia Cadi Ayyad University Marrakech Morocco ActonMA United States Silesian University of Technology Department of Electronics Electrical Engineering and Microelectronics Akademicka 16 Gliwice44-100 Poland Earth and Planets Laboratory Carnegie Institution for Science 5241 Broad Branch Road NW WashingtonDC20015 United States SETI Institute United States NASA Ames Research Center Moffett Field CA94035 United States Institute for Astronomy University of Hawai’i HonoluluHI96822 United States Caltech/IPAC-NASA Exoplanet Science Institute 770 S. Wilson Avenue PasadenaCA91106 United States American Association of Variable Star Observers 49 Bay State Road CambridgeMA02138 United States Observatories of the Carnegie Institution for Science 813 Santa Barbara Street PasadenaCA91101 United States

NASA’s Transiting Exoplanet Survey Satellite (TESS) mission promises to improve our understanding of hot Jupiters by providing an all-sky, magnitude-limited sample of transiting hot Jupiters suitable for population studies. Assembling such a sample requires confirming hundreds of planet candidates with additional follow-up observations. Here, we present twenty hot Jupiters that were detected using TESS data and confirmed to be planets through photometric, spectroscopic, and imaging observations coordinated by the TESS Follow-up Observing Program (TFOP). These twenty planets have orbital periods shorter than 7 days and orbit relatively bright FGK stars (10.9 ◦). We also investigated the possibility that TOI-1937 is a member of the NGC 2516 open cluster, but ultimately found the evidence for cluster membership to be ambiguous. These objects are part of a larger effort to build a complete sample of hot Jupiters to be used for future demographic and detailed characterization work. © 2022, CC BY.

关键词： Planets

Another Shipment of Six Short-Period Giant Planets from TESS

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arXiv 2022年

作者： Rodriguez, Joseph E. Quinn, Samuel N. Vanderburg, Andrew Zhou, George Eastman, Jason D. Thygesen, Erica Cale, Bryson Ciardi, David R. Reed, Phillip A. Oelkers, Ryan J. Collins, Karen A. Bieryla, Allyson Latham, David W. Gonzales, Erica J. Gaudi, B. Scott Hellier, Coel Jones, Matías I. Brahm, Rafael Sokolovsky, Kirill Schulte, Jack Srdoc, Gregor Kielkopf, John Horta, Ferran Grau Massey, Bob Evans, Phil Stephens, Denise C. McLeod, Kim K. Chazov, Nikita Krushinsky, Vadim Ghachoui, Mourad Safonov, Boris S. Dedrick, Cayla M. Conti, Dennis Laloum, Didier Giacalone, Steven Ziegler, Carl Serra, Pere Guerra Nogues, Ramon Naves Murgas, Felipe Michaels, Edward J. Ricker, George R. Vanderspek, Roland K. Seager, Sara Winn, Joshua N. Jenkins, Jon M. Addison, Brett Alfaro, Owen Anderson, D.R. Aydi, Elias Beatty, Thomas G. Bedding, Timothy R. Belinski, Alexander A. Benkhaldoun, Zouhair Berlind, Perry Blake, Cullen H. Bowen, Michael J. Bowler, Brendan P. Boyle, Andrew W. Branson, Dalton Briceño, César Calkins, Michael L. Campbell, Emma Christiansen, Jessie L. Chomiuk, Laura Collins, Kevin I. Cornachione, Matthew A. Daassou, Ahmed Dressing, Courtney D. Esquerdo, Gilbert A. Feliz, Dax L. Fong, William Fukui, Akihiko Gan, Tianjun Gill, Holden Goliguzova, Maria V. Hansen, Jarrod Henning, Thomas Hintz, Eric G. Hobson, Melissa J. Horner, Jonathan Huang, Chelsea X. James, David J. Jensen, Jacob S. Johnson, Samson A. Jordán, Andrés Kane, Stephen R. Barkaoui, Khalid Kim, Myung-Jin Kim, Kingsley Kuhn, Rudolf B. Law, Nicholas Lewin, Pablo Liu, Hui-Gen Lund, Michael B. Mann, Andrew W. McCrady, Nate Mengel, Matthew W. Mink, Jessica Murphy, Lauren G. Narita, Norio Newman, Patrick Okumura, Jack Osborn, Hugh P. Paegert, Martin Palle, Enric Pepper, Joshua Plavchan, Peter Popov, Alexander A. Rabus, Markus Ranshaw, Jessica Rodriguez, Jennifer A. Roh, Dong-Goo Reefe, Michael A. Savel, Arjun B. Schwarz, Richard P. Shporer, Avi Siverd, Robert J. Sliski, David H. Stassun, Keivan G. Stevens, Daniel J. Soubkiou, Abderahmane Ting, Eric B. Tinney, C.G. Vow Center for Data Intensive and Time Domain Astronomy Department of Physics and Astronomy Michigan State University East LansingMI48824 United States Center for Astrophysics | Harvard & Smithsonian 60 Garden St CambridgeMA02138 United States Department of Physics Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA02139 United States Centre for Astrophysics University of Southern Queensland West Street ToowoombaQLD4350 Australia Caltech IPAC NASA Exoplanet Science Institute 1200 E. California Ave PasadenaCA91125 United States Department of Physical Sciences Kutztown University KutztownPA19530 United States George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College StationTX77843 United States Charles R. & Judith G. Munnerlyn Astronomical Laboratory Department of Physics & Astronomy Texas A&M University College StationTX77843 United States Center for Gravitational Wave Astronomy The University of Texas Rio Grande Valley BrownsvilleTX78520 United States Department of Astronomy and Astrophysics University of California Santa CruzCA95064 United States Department of Astronomy The Ohio State University 140 West 18th Avenue ColumbusOH43210 United States Astrophysics Group Keele University StaffordshireST5 5BG United Kingdom European Southern Observatory Alonso de Córdova 3107 Vitacura Casilla Santiago19001 Chile Facultad de Ingeniería y Ciencias Universidad Adolfo Ibáñez Av. Diagonal las Torres 2640 Peñalolén Santiago Chile Millennium Institute for Astrophysics Chile Data Observatory Foundation Chile Kotizarovci Observatory Sarsoni 90 Viskovo51216 Croatia Department of Physics and Astronomy University of Louisville LouisvilleKY40292 United States Observatri de Ca l'Ou United States Villa'39 Observatory LandersCA92285 United States El Sauce Observatory Coquimbo Province Chile Department of Physics and Astronomy Brigham Young Un

We present the discovery and characterization of six short-period, transiting giant planets from NASA's Transiting Exoplanet Survey Satellite (TESS) - TOI-1811 (TIC 376524552), TOI-2025 (TIC 394050135), TOI-2145 (TIC 88992642), TOI-2152 (TIC 395393265), TOI-2154 (TIC 428787891), & TOI-2497 (TIC 97568467). All six planets orbit bright host stars (8.9 P = 0.99-1.45 RJ), have masses ranging from 0.92 to 5.26 MJ, and orbit F, G, and K stars (4766 ≤ Teff ≤ 7360 K). We detect a significant orbital eccentricity for the three longest-period systems in our sample: TOI-2025 b (P = 8.872 days, 0.394+0.035..0.038, TOI-2145 b (P = 10.261 days, e = 0.208+0.034-0.047, and TOI-2497 b (P = 10.656 days, e = 0.195+0.043-0.040. TOI-2145 b and TOI-2497 b both orbit subgiant host stars (3.8 +0.38-0.37 MJ (TOI-2145 b) and 4.82 ± 0.41 MJ (TOI-2497 b). These six new discoveries contribute to the larger community effort to use TESS to create a magnitude-complete, self-consistent sample of giant planets with well-determined parameters for future detailed studies. Copyright © 2022, The Authors. All rights reserved.

关键词： Satellites

Field heterogeneity detection based on the modified FastICA RGB-image processing

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Journal of Physics: Conference Series 2018年第1期1117卷

作者： L Mirvakhabova M Pukalchik S Matveev P Tregubova I Oseledets Skoltech Center for Computational and Data-Intensive Science and Engineering Skolkovo Institute of Science and Technology 1 Nobel Street Moscow 121205 Russia Marchuk Institute of Numerical Mathematics RAS 8 Gubkin Street 119333 Moscow Russia

In the light of the increasing demand for food production, climate change challenges, and economic pressure, precision farming is becoming an ever-growing market. Nowadays using satellite images for field zoning has become a widely spread technique employed in precision agriculture. Usually satellite images are used to evaluate Normalized Difference Vegetation Index (NDVI) as a common yield assessment. At the same time it is rather a challenging task to designing NDVI maps as compared to ordinary RGB images. We propose a new algorithm for site-specific zoning based on the performance of a well-known and widely used ICA algorithm (FastICA). We analyse high resolution RGB satellite images for 3 arable fields located in Kursk region, Russia, (2017) provided by the Planet Labs service. The main outcomes from this study are (i) the algorithm creates site-specific zoning maps with a relative accuracy of yield distribution maps between 0.78 and 0.89; (ii) the algorithm requires a relatively small dataset – from 8 to 10 RGB images. The obtained results indicate that the algorithm in question can be used not only to identify management zones but also to map the variations in yield within the fields.

关键词：

Low-density star cluster formation: discovery of a young faint fuzzy on the outskirts of the low-mass spiral galaxy NGC 247

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arXiv 2022年

作者： Romanowsky, Aaron J. Larsen, Søren S. Villaume, Alexa Carlin, Jeffrey L. Janz, Joachim Sand, David J. Strader, Jay Brodie, Jean P. Chakrabarti, Sukanya Cheng, Chloe M. Crnojević, Denija Forbes, Duncan A. Garling, Christopher T. Hargis, Jonathan R. Karunakaran, Ananthan Martín-Navarro, Ignacio Olsen, Knut A.G. Rider, Nicole Salimkumar, Bitha Santhanakrishnan, Vakini Spekkens, Kristine Tang, Yimeng van Dokkum, Pieter G. Willman, Beth Department of Physics & Astronomy San José State University One Washington Square San JoseCA95192 United States University of California Observatories 1156 High Street Santa CruzCA95064 United States Department of Astronomy & Astrophysics University of California Santa Cruz 1156 High Street Santa CruzCA95064 United States Department of Astrophysics IMAPP Radboud University PO Box 9010 Nijmegen6500 GL Netherlands Waterloo Centre for Astrophysics Department of Physics & Astronomy University of Waterloo 200 University Ave. W. WaterlooONN2L 3G1 Canada Rubin Observatory Project Office 950 N. Cherry Ave. TucsonAZ85719 United States University of Turku Vesilinnantie 5 FI-20014 Finland Space Physics and Astronomy Research Unit University of Oulu P.O. Box 3000 Yliopisto OulunFI-90014 Finland Specim Spectral Imaging Ltd. Elektroniikkatie 13 OuluFI-90590 Finland Steward Observatory University of Arizona 933 North Cherry Avenue TucsonAZ85721 United States Center for Data Intensive and Time Domain Astronomy Department of Physics and Astronomy Michigan State University East LansingMI48824 United States Centre for Astrophysics and Supercomputing Swinburne University John Street HawthornVIC3122 Australia School of Physics and Astronomy RIT RochesterNY14623 United States Institute for Advanced Study 1 Einstein Drive PrincetonNJ08540 United States University of Tampa 401 West Kennedy Boulevard TampaFL33606 United States CCAPP Department of Astronomy The Ohio State University 140 W. 18th Ave. ColumbusOH43210 United States Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Department of Physics Engineering Physics and Astronomy Queen’s University KingstonONK7L 3N6 Canada Instituto de Astrofísica de Canarias Tenerife La LagunaE-38205 Spain Departamento de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38205 Spain NSF’s National Optical-Infrared Astronomy Research Laboratory 950

The classical globular clusters found in all galaxy types have half-light radii of rh ∼ 2–4 pc, which have been tied to formation in the dense cores of giant molecular clouds. Some old star clusters have larger sizes, and it is unclear if these represent a fundamentally different mode of low-density star cluster formation. We report the discovery of a rare, young "faint fuzzy" star cluster, NGC 247-SC1, on the outskirts of the low-mass spiral galaxy NGC 247 in the nearby Sculptor group, and measure its radial velocity using Keck spectroscopy. We use Hubble Space Telescope imaging to measure the cluster half-light radius of rh ' 12 pc and a luminosity of Lv ' 4 × 105L . We produce a colour–magnitude diagram of cluster stars and compare to theoretical isochrones, finding an age of '300 Myr, a metallicity of [Z/H] ∼ −0.6 and an inferred mass of M★ ' 9 × 104M . The narrow width of blue-loop star magnitudes implies an age spread of . 50 Myr, while no old red-giant branch stars are found, so SC1 is consistent with hosting a single stellar population, modulo several unexplained bright "red straggler" stars. SC1 appears to be surrounded by tidal debris, at the end of a ∼ 2 kpc long stellar filament that also hosts two low-mass, low-density clusters of a similar age. We explore a link between the formation of these unusual clusters and an external perturbation of their host galaxy, illuminating a possible channel by which some clusters are born with large sizes. © 2022, CC BY-NC-SA.

关键词： Galaxies