arXiv: Instrumentation and Methods for Astrophysics最新文献_第3页

A semisupervised machine learning search for never-seen gravitational-wave sources 半监督机器学习搜索从未见过的引力波源

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-10-22 DOI: 10.1093/mnras/staa3550

Tom Marianer, D. Poznanski, J. Prochaska

{"title":"A semisupervised machine learning search for never-seen gravitational-wave sources","authors":"Tom Marianer, D. Poznanski, J. Prochaska","doi":"10.1093/mnras/staa3550","DOIUrl":"https://doi.org/10.1093/mnras/staa3550","url":null,"abstract":"By now, tens of gravitational-wave (GW) events have been detected by the LIGO and Virgo detectors. These GWs have all been emitted by compact binary coalescence, for which we have excellent predictive models. However, there might be other sources for which we do not have reliable models. Some are expected to exist but to be very rare (e.g., supernovae), while others may be totally unanticipated. So far, no unmodeled sources have been discovered, but the lack of models makes the search for such sources much more difficult and less sensitive. We present here a search for unmodeled GW signals using semi-supervised machine learning. We apply deep learning and outlier detection algorithms to labeled spectrograms of GW strain data, and then search for spectrograms with anomalous patterns in public LIGO data. We searched $sim 13%$ of the coincident data from the first two observing runs. No candidates of GW signals were detected in the data analyzed. We evaluate the sensitivity of the search using simulated signals, we show that this search can detect spectrograms containing unusual or unexpected GW patterns, and we report the waveforms and amplitudes for which a $50%$ detection rate is achieved.","PeriodicalId":8459,"journal":{"name":"arXiv: Instrumentation and Methods for Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74855443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Developing a Real-Time Processing System for HERA HERA实时处理系统的开发

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-10-22 DOI: 10.46620/20-0041

P. Plante, P. Williams, J. Dillon

引用次数: 0

Assembly Integration and Verification Activities for a 2U CubeSat EIRSAT-1 2U立方体卫星EIRSAT-1的装配集成与验证活动

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-10-20 DOI: 10.29311/2020.33

Sarah Walsh, D. Murphy, M. Doyle, Joseph W. Thompson, Rachel Dunwoody, M. Emam, J. Erkal, Joe Flanagan, G. Fontanesi, Andrew Gloster, Joe Mangan, Conor O’Toole, F. Okosun, Rakhi Rajagopalan Nair, Jack Reilly, L. Salmon, D. Sherwin, P. Cahill, D. Faoite, Umair Javaid, L. Hanlon, David J. McKeown, William J. O'Connor, K. Stanton, A. Ulyanov, R. Wall, S. McBreen

{"title":"Assembly Integration and Verification Activities for a 2U CubeSat EIRSAT-1","authors":"Sarah Walsh, D. Murphy, M. Doyle, Joseph W. Thompson, Rachel Dunwoody, M. Emam, J. Erkal, Joe Flanagan, G. Fontanesi, Andrew Gloster, Joe Mangan, Conor O’Toole, F. Okosun, Rakhi Rajagopalan Nair, Jack Reilly, L. Salmon, D. Sherwin, P. Cahill, D. Faoite, Umair Javaid, L. Hanlon, David J. McKeown, William J. O'Connor, K. Stanton, A. Ulyanov, R. Wall, S. McBreen","doi":"10.29311/2020.33","DOIUrl":"https://doi.org/10.29311/2020.33","url":null,"abstract":"The Educational Irish Research Satellite, EIRSAT-1, is a project developed by students at University College Dublin that aims to design, build, and launch Ireland's first satellite. EIRSAT-1 is a 2U CubeSat incorporating three novel payloads; GMOD, a gamma-ray detector, EMOD, a thermal coating management experiment, and WBC, a novel attitude control algorithm. The EIRSAT-1 project is carried out with the support of the Education Office of the European Space Agency, under the educational Fly your Satellite! programme. The Assembly, Integration and Verification plan for EIRSAT-1 is central to the philosophy and the development of the spacecraft. The model philosophy employed for the project is known as the 'prototype' approach in which two models of the spacecraft are assembled; an Engineering Qualification Model (EQM) and a Flight Model (FM). The payloads, GMOD and EMOD, and the Antenna Deployment Module (ADM) platform element warrant a Development Model in addition to an EQM and a FM, as they have been designed and developed in-house. After successful completion of the Critical Design Review and Ambient Test Readiness Review phases of the project, the EQM of EIRSAT-1 will be assembled and integrated. After assembly and integration of the EQM, the project will begin the ambient test campaign, in which the EQM undergoes ambient functional and mission testing. This work details the preparation and execution of the assembly, integration, and verification activities of EIRSAT-1 EQM.","PeriodicalId":8459,"journal":{"name":"arXiv: Instrumentation and Methods for Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73566434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Ice Giant Atmospheric Science 冰巨大气科学

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-10-16 DOI: 10.3847/25C2CFEB.97316A54

E. Dahl, S. Brueshaber, R. Cosentino, C. Palotai, N. Rowe-Gurney, R. Sankar, K. Sayanagi, S. Aslam, K. Baines, E. Barth, N. Chanover, L. Fletcher, S. Guerlet, H. Hammel, M. Hofstadter, A. Hyder, E. Leonard, T. Livengood, T. Momary, G. Orton, I. Pater, K. Retherford, J. Sinclair, K. Soderlund, L. Spilker, L. Sromovsky, M. Wong

引用次数: 2

Ethical Exploration and the Role of Planetary Protection in Disrupting Colonial Practices 伦理探索和行星保护在破坏殖民行为中的作用

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-10-15 DOI: 10.3847/25C2CFEB.CDC2F798

F. Tavares, D. Buckner, Dana Burton, J. McKaig, P. Prem, E. Ravanis, Natalie Trevino, A. Venkatesan, S. Vance, M. Vidaurri, L. Walkowicz, M. Wilhelm

{"title":"Ethical Exploration and the Role of Planetary Protection in Disrupting Colonial Practices","authors":"F. Tavares, D. Buckner, Dana Burton, J. McKaig, P. Prem, E. Ravanis, Natalie Trevino, A. Venkatesan, S. Vance, M. Vidaurri, L. Walkowicz, M. Wilhelm","doi":"10.3847/25C2CFEB.CDC2F798","DOIUrl":"https://doi.org/10.3847/25C2CFEB.CDC2F798","url":null,"abstract":"We recommend that the planetary science and space exploration community engage in a robust reevaluation concerning the ethics of how future crewed and uncrewed missions to the Moon and Mars will interact with those planetary environments. This should occur through a process of community input, with emphasis on how such missions can resist colonial structures. Such discussions must be rooted in the historical context of the violent colonialism in the Americas and across the globe that has accompanied exploration of Earth. The structures created by settler colonialism are very much alive today, impact the scientific community, and are currently replicated in the space exploration communities' plans for human exploration and in-situ resource utilization. These discussions must lead to enforceable planetary protection policies that create a framework for ethical exploration of other worlds. Current policy does not adequately address questions related to in-situ resource utilization and environmental preservation and is without enforcement mechanisms. Further, interactions with potential extraterrestrial life have scientific and moral stakes. Decisions on these topics will be made in the coming decade as the Artemis program enables frequent missions to the Moon and crewed missions to Mars. Those first choices will have irreversible consequences for the future of human space exploration and must be extremely well considered, with input from those beyond the scientific community, including expertise from the humanities and members of the general public. Without planetary protection policy that actively resists colonial practices, they will be replicated in our interactions and exploration of other planetary bodies. The time is now to engage in these difficult conversations and disrupt colonial practices within our field so that they are not carried to other worlds.","PeriodicalId":8459,"journal":{"name":"arXiv: Instrumentation and Methods for Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79565308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Revisiting profile instability of PSR J1022+1001 PSR J1022+1001剖面不稳定性研究

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-10-08 DOI: 10.1093/mnras/staa3174

P. Padmanabh, E. Barr, D. Champion, R. Karuppusamy, M. Kramer, A. Jessner, P. Lazarus

{"title":"Revisiting profile instability of PSR J1022+1001","authors":"P. Padmanabh, E. Barr, D. Champion, R. Karuppusamy, M. Kramer, A. Jessner, P. Lazarus","doi":"10.1093/mnras/staa3174","DOIUrl":"https://doi.org/10.1093/mnras/staa3174","url":null,"abstract":"Millisecond pulsars in timing arrays can act as probes for gravitational wave detection and improving the solar system ephemerides among several other applications. However, the stability of the integrated pulse profiles can limit the precision of the ephemeris parameters and in turn the applications derived from it. It is thus crucial for the pulsars in the array to have stable integrated pulse profiles. Here we present evidence for long-term profile instability in PSR J1022+1001 which is currently included in the European and Parkes pulsar timing arrays. We apply a new evaluation method to an expanded data set ranging from the Effelsberg Pulsar Observing System back-end used in the 1990s to that of data from the current PSRIX backend at the Effelsberg Radio Telescope. We show that this intrinsic variability in the pulse shape persists over time scales of years. We investigate if systematic instrumental effects like polarisation calibration or signal propagation effects in the interstellar medium causes the observed profile instability. We find that the total variation cannot be fully accounted for by instrumental and propagation effects. This suggests additional intrinsic effects as the origin for the variation. We finally discuss several factors that could lead to the observed behaviour and comment on the consequent implications.","PeriodicalId":8459,"journal":{"name":"arXiv: Instrumentation and Methods for Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78290659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The Case for Non-Cryogenic Comet Nucleus Sample Return 非低温彗星核样本返回的案例

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-09-30 DOI: 10.3847/25C2CFEB.441B2770

K. Nakamura-messenger, A. Hayes, S. Sandford, C. Raymond, S. Squyres, L. Nittler, S. Birch, Denis Bodewits, N. Chabot, M. Wadhwa, M. Choukroun, S. Clemett, M. Bose, N. Russo, J. Dworkin, J. Elsila, K. Fisher, P. Gerakines, D. Glavin, J. Mitchell, M. Mumma, A. Nguyen, L. Pace, J. Soderblom, J. Sunshine

{"title":"The Case for Non-Cryogenic Comet Nucleus Sample Return","authors":"K. Nakamura-messenger, A. Hayes, S. Sandford, C. Raymond, S. Squyres, L. Nittler, S. Birch, Denis Bodewits, N. Chabot, M. Wadhwa, M. Choukroun, S. Clemett, M. Bose, N. Russo, J. Dworkin, J. Elsila, K. Fisher, P. Gerakines, D. Glavin, J. Mitchell, M. Mumma, A. Nguyen, L. Pace, J. Soderblom, J. Sunshine","doi":"10.3847/25C2CFEB.441B2770","DOIUrl":"https://doi.org/10.3847/25C2CFEB.441B2770","url":null,"abstract":"Comets hold answers to mysteries of the Solar System by recording presolar history, the initial states of planet formation and prebiotic organics and volatiles to the early Earth. Analysis of returned samples from a comet nucleus will provide unparalleled knowledge about the Solar System starting materials and how they came together to form planets and give rise to life: \u00001. How did comets form? \u00002. Is comet material primordial, or has it undergone a complex alteration history? \u00003. Does aqueous alteration occur in comets? \u00004. What is the composition of cometary organics? \u00005. Did comets supply a substantial fraction of Earth's volatiles? \u00006. Did cometary organics contribute to the homochirality in life on Earth? \u00007. How do complex organic molecules form and evolve in interstellar, nebular, and planetary environments? \u00008. What can comets tell us about the mixing of materials in the protosolar nebula?","PeriodicalId":8459,"journal":{"name":"arXiv: Instrumentation and Methods for Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82424984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Low-energy X-ray performance of SOI pixel sensors for astronomy, “XRPIX” SOI天文像素传感器“XRPIX”的低能x射线性能

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-09-29 DOI: 10.1016/j.nima.2020.164745

Ryota Kodama, T. Tsuru, Takaaki Tanaka, H. Uchida, K. Kayama, Y. Amano, A. Takeda, K. Mori, Y. Nishioka, M. Yukumoto, T. Hida, Y. Arai, I. Kurachi, T. Kohmura, K. Hagino, Mitsuki Hayashida, Masatoshi Kitajima, S. Kawahito, K. Yasutomi, H. Kamehama

引用次数: 5

Lunar Opportunities for SETI 寻找地外文明的月球机会

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-09-26 DOI: 10.3847/25C2CFEB.19D4B457

Eric J. Michaud, A. Siemion, J. Drew, S. P. Worden

引用次数: 2

Critical Laboratory Studies to Advance Planetary Science and Support Missions 推进行星科学和支持任务的关键实验室研究

arXiv: Instrumentation and Methods for Astrophysics Pub Date : 2020-09-25 DOI: 10.3847/25C2CFEB.F51744BB

E. Fayolle, L. Barge, M. Cable, B. Drouin, J. Dworkin, J. Hanley, B. Henderson, B. Journaux, A. Noell, Farid Salama, E. Sciamma-O’Brien, S. Waller, J. Weber, C. Bennett, J. Blum, M. Gudipati, S. Milam, M. Melwani-Daswani, M. Nuevo, S. Protopapa, Rachel Smith

{"title":"Critical Laboratory Studies to Advance Planetary Science and Support Missions","authors":"E. Fayolle, L. Barge, M. Cable, B. Drouin, J. Dworkin, J. Hanley, B. Henderson, B. Journaux, A. Noell, Farid Salama, E. Sciamma-O’Brien, S. Waller, J. Weber, C. Bennett, J. Blum, M. Gudipati, S. Milam, M. Melwani-Daswani, M. Nuevo, S. Protopapa, Rachel Smith","doi":"10.3847/25C2CFEB.F51744BB","DOIUrl":"https://doi.org/10.3847/25C2CFEB.F51744BB","url":null,"abstract":"Laboratory studies for planetary science and astrobiology aimat advancing our understanding of the Solar System through the promotion of theoretical and experimental research into the underlying processes that shape it. Laboratory studies (experimental and theoretical) are crucial to interpret observations and mission data, and are key incubators for new mission concepts as well as instrument development and calibration. They also play a vital role in determining habitability of Solar System bodies, enhancing our understanding of the origin of life, and in the search for signs of life beyond Earth, all critical elements of astrobiology. Here we present an overview of the planetary science areas where laboratory studies are critically needed, in particular in the next decade. These areas include planetary & satellites atmospheres, surfaces, and interiors, primitive bodies such as asteroids, meteorites, comets, and trans-Neptunian objects, and signs of life. Generating targeted experimental and theoretical laboratory data that are relevant for a better understanding of the physical, chemical, and biological processes occurring in these environments is crucial. For each area we present i) a brief overview of the state-of-the-art laboratory work, ii) the challenges to analyze and interpret data sets from missions and ground-based observations and to support mission and concept development, and iii) recommendations for high priority laboratory studies.","PeriodicalId":8459,"journal":{"name":"arXiv: Instrumentation and Methods for Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82376246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0