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Liodakis I, Koljonen KII, Blinov D, Lindfors E, Alexander KD, Hovatta T, Berton M, Hajela A, Jormanainen J, Kouroumpatzakis K, Mandarakas N, Nilsson K. Optical polarization from colliding stellar stream shocks in a tidal disruption event. Science 2023; 380:656-658. [PMID: 37167392 DOI: 10.1126/science.abj9570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
A tidal disruption event (TDE) occurs when a supermassive black hole rips apart a passing star. Part of the stellar material falls toward the black hole, forming an accretion disk that in some cases launches a relativistic jet. We performed optical polarimetry observations of a TDE, AT 2020mot. We find a peak linear polarization degree of 25 ± 4%, consistent with highly polarized synchrotron radiation, as is typically observed from relativistic jets. However, our radio observations, taken up to 8 months after the optical peak, do not detect the corresponding radio emission expected from a relativistic jet. We suggest that the linearly polarized optical emission instead arises from shocks that occur during accretion disk formation, as the stream of stellar material collides with itself.
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Affiliation(s)
- I Liodakis
- Finnish Center for Astronomy with the European Southern Observatory, University of Turku, FI-20014 Turku, Finland
| | - K I I Koljonen
- Finnish Center for Astronomy with the European Southern Observatory, University of Turku, FI-20014 Turku, Finland
- Metsähovi Radio Observatory, Aalto University, FI-02540 Kylmälä, Finland
- Institutt for Fysikk, Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - D Blinov
- Institute of Astrophysics, Foundation for Research and Technology - Hellas, GR-71110 Heraklion, Greece
- Department of Physics, University of Crete, GR-70013 Heraklion, Greece
| | - E Lindfors
- Finnish Center for Astronomy with the European Southern Observatory, University of Turku, FI-20014 Turku, Finland
| | - K D Alexander
- Center for Interdisciplinary Exploration and Research in Astrophysics, Northwestern University, Evanston, IL 60208, USA
- Steward Observatory, University of Arizona, Tucson, AZ 85721-0065, USA
| | - T Hovatta
- Finnish Center for Astronomy with the European Southern Observatory, University of Turku, FI-20014 Turku, Finland
- Metsähovi Radio Observatory, Aalto University, FI-02540 Kylmälä, Finland
| | - M Berton
- Finnish Center for Astronomy with the European Southern Observatory, University of Turku, FI-20014 Turku, Finland
- Metsähovi Radio Observatory, Aalto University, FI-02540 Kylmälä, Finland
- European Southern Observatory, Santiago, 19001, Chile
| | - A Hajela
- Center for Interdisciplinary Exploration and Research in Astrophysics, Northwestern University, Evanston, IL 60208, USA
- Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, 2200 Copenhagen, Denmark
| | - J Jormanainen
- Finnish Center for Astronomy with the European Southern Observatory, University of Turku, FI-20014 Turku, Finland
- Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - K Kouroumpatzakis
- Institute of Astrophysics, Foundation for Research and Technology - Hellas, GR-71110 Heraklion, Greece
- Department of Physics, University of Crete, GR-70013 Heraklion, Greece
- Astronomical Institute of the Czech Academy of Sciences, CZ-14131 Prague, Czech Republic
| | - N Mandarakas
- Institute of Astrophysics, Foundation for Research and Technology - Hellas, GR-71110 Heraklion, Greece
- Department of Physics, University of Crete, GR-70013 Heraklion, Greece
| | - K Nilsson
- Finnish Center for Astronomy with the European Southern Observatory, University of Turku, FI-20014 Turku, Finland
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Chen G, Qin Z, Li J, Liu L. A global CHIPR potential energy surface of PH 2(X 2B 1) via extrapolation to the complete basis set limit and the dynamics of P( 2D) + H 2(X 1Σ+g) → PH(X 3Σ −) + H( 2S). Phys Chem Chem Phys 2022; 24:19371-19381. [DOI: 10.1039/d2cp02690b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A global PEC of the ground state PH2 was constructed using the CHIPR method based on accurate MRCI(Q)/CBS(T, Q) energy points. The ICS and k(T) of P(2D) + H2(X1Σ+g) → PH(X3Σ−) + H(2S) were calculated based on the QCT method.
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Affiliation(s)
- Guangan Chen
- School of Energy and Power Engineering, Shandong University, 250061, Jinan, China
| | - Zhi Qin
- School of Energy and Power Engineering, Shandong University, 250061, Jinan, China
- Optics and Thermal Radiation Research Center, Institute of Frontier and Interdisciplinary Science, Shandong University, 266237, Qingdao, China
| | - Jing Li
- School of Physics and Physical Engineering, Qufu Normal University, 273165, Qufu, China
| | - Linhua Liu
- School of Energy and Power Engineering, Shandong University, 250061, Jinan, China
- Optics and Thermal Radiation Research Center, Institute of Frontier and Interdisciplinary Science, Shandong University, 266237, Qingdao, China
- School of Energy Science and Engineering, Harbin Institute of Technology, 150001, Harbin, China
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Delacour T, Lesteven S, Landais G, Eisele A, Neuville M, Son E, Vonflie P. Bibliographical references: From publishers to SIMBAD. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201818612004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The SIMBAD astronomical database hosted by the CDS provides basic data, cross-identifications, bibliography and measurements for astronomical objects outside the solar system.
The CDS receives the bibliographic meta-data of the articles published in the main astronomical journals directly from the publishers. How we receive the data and their format vary from one publisher to the next. These data are first extracted and stored in files with a standardised format. Then, to avoid errors or misprints, we perform different tests on these data:
- Author names are compared to a reference list maintained at CDS, and the keywords are compared with the AAS list
- Astronomical objects are verified by checking their name in the SIMBAD database
- A completion test checks that all of articles of a journal volume are present
The next step identifies whether an astronomical object appears inside a title, a keyword or an abstract, and if so, we add a link to the object in SIMBAD. Once all of the verifications and corrections have been made we add the meta-data into SIMBAD. We also add other information such as the number of different astronomical objects studied in the paper, the presence tables and their links to VizieR, any new acronyms, as well as some comments. New developments are in progress to automatically extract the data from the tables in the articles (that have not been processed by, or provided to VizieR) . In addition, each night automatic checks are executed to list the new data and to test the coherence of these data in SIMBAD.
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