Article
Astronomy & Astrophysics
Yan-Zhi Meng, Jin-Jun Geng, Xue-Feng Wu
Summary: This article investigates the photosphere spectrum of a hybrid outflow containing both a thermal component and a magnetic component. The high-energy spectrum obtained using the probability photosphere model is consistent with the observed GRB spectra. The distribution of the low-energy indices is in agreement with the statistical results for the best-fitted Band function.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xin-Ying Song, Yan-Zhi Meng
Summary: This paper studies the hardness-intensity correlation (HIC) of photospheric emissions from a structured jet in different regimes. The findings suggest that positive kappa values less than 1/4 can be observed in an intermediate photosphere, and can be generalized to other cases. Additionally, the emissions from the intermediate photosphere have a smaller low-energy photon index compared to the unsaturated regime, and can naturally reproduce the anticorrelation in alpha - E-p in GRB pulses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xin-Ying Song, Shuang-Nan Zhang, Ming-Yu Ge, Shu Zhang
Summary: Researchers performed several tests to speculate the origin of the photospheric emission in GRB 220426A, and concluded that a hybrid outflow is the most likely source, while other possible origins such as non-dissipative hybrid outflow or magnetic reconnection are not well-supported.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Hao-Jui Kuan, Arthur G. Suvorov, Kostas D. Kokkotas
Summary: The study investigates the causes of precursor flares in merging quasi-circular binaries and finds that tidal forces resonantly excite quasi-normal modes in stars, leading to a rapid increase in amplitude and ultimately triggering crustal failure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Dichiara, E. Troja, V Lipunov, R. Ricci, S. R. Oates, N. R. Butler, E. Liuzzo, G. Ryan, B. O'Connor, S. B. Cenko, R. G. Cosentino, A. Y. Lien, E. Gorbovskoy, N. Tyurina, P. Balanutsa, D. Vlasenko, I Gorbunov, R. Podesta, F. Podesta, R. Rebolo, M. Serra, D. A. H. Buckley
Summary: This article presents a multiwavelength analysis of GRB 190829A, which is the fourth closest long GRB ever detected by the Neil Gehrels Swift observatory and the third confirmed case with a very high-energy component. The study reveals two emission components in the event, with a bright reverse shock dominating at early times and a forward shock dominating at later times. The prompt and afterglow properties suggest that GRB 190829A shares similarities with cosmological long GRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Shuang-Xi Yi, Wei Xie, Shuai-Bing Ma, Wei-Hua Lei, Mei Du
Summary: The X-ray flares in gamma-ray bursts are believed to be generated by the late activities of central engine, providing a useful tool to diagnose the properties of central objects. By studying a sample of GRB X-ray flares, the parameters of the central engine were constrained, and the jet opening angles were determined. It was found that the Blandford & Znajek process can explain both GRB prompt emissions and bright X-ray flares, but the X-ray flare in GRB 170817A may not be of black hole origin.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alina Nawaz, Saeeda Sajjad
Summary: This article addresses the question of the degree of magnetization of the jets in Gamma-Ray Burst (GRB) physics, focusing on GRB 150902A. The results of spectral analysis indicate the presence of a strong magnetic component in the initial outflow, allowing for further study and constraints on the properties of the outflow.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Tamar Faran, Re'em Sari
Summary: We calculate the observed luminosity and spectrum in the aftermath of a relativistic shock wave from a stellar edge, finding that the shock wave heats the stellar envelope, leading to the production of electron and positron pairs. These pairs increase the optical depth and regulate temperature through photon generation, producing distinct observational signatures. We apply our model to low-luminosity gamma-ray bursts and find some events consistent with the relativistic shock breakout model. We also investigate explosions in white dwarfs and neutron stars, discovering that type Ia supernovae emit energy in the form of MeV photons.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Ioulia Florou, Apostolos Mastichiadis, Maria Petropoulou
Summary: Relativistic hadronic plasmas can become supercritical, releasing energy through photon outbursts. This study investigates hadronic supercriticalities in adiabatically expanding sources, examining the trigger conditions and the role of expansion velocity. The results suggest a connection between these supercriticalities and gamma-ray burst prompt emission, providing insights into the formation of light curves and photon spectra.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yun-Guo Jiang, Ke-Xin Liu, Lang Shao, Huai-Zhen Li
Summary: This study examines the spectral-lag phenomenon of gamma-ray bursts (GRBs) and proposes a method using the photosphere in the jet model to interpret the spectral lag. The research finds that the magnetic field at the photosphere radius is distributed in the range of 10(4) to 10(7) G.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ioulia Florou, Maria Petropoulou, Apostolos Mastichiadis
Summary: This study examines the prompt emission of a small fraction of gamma-ray bursts (GRBs) and investigates the possibility of relativistic protons as the source. The results strongly disfavor marginally fast cooling protons as an explanation for the low-energy spectral break in prompt GRB spectra.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jing-Ze Ma, Bing Zhang
Summary: This study investigates the influence of different magnetic field geometries on relativistic shocks. The results show that the tangential magnetization has a greater impact on the jump conditions, regardless of the inclination angles or anisotropy of the magnetic field. The approximated analytical solution developed in this work is significant for numerical simulations and theoretical studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Leonardo Garcia-Garcia, Diego Lopez-Camara, Davide Lazzati
Summary: The merger of two neutron stars produces gravitational waves and a compact object surrounded by a dense and magnetized environment. The interaction of the relativistic non-magnetized jet with the magnetized medium after the merger suppresses instabilities and prevents the formation of collimation shocks, resulting in low-luminosity prompt emission bursts. However, the jet-head velocity and induced magnetization within the jet are independent of the ambient medium's magnetization. Further numerical studies are needed to understand the role of magnetized media.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Shotaro Yamasaki, Tsvi Piran
Summary: This study presents a methodology to obtain an analytical approximation of an observed spectrum and infer the conditions at the emitting region. By applying this method to the observations of GRB 190114C, it is found that fitting the model parameters using the analytical SSC spectrum has some generic problems. However, with a correction to the standard Klein-Nishina (KN) approximation, the best-fitting solution is consistent with detailed numerical simulations. The study also explains the emergence of a family of solutions that satisfy the relationship B proportional to Gamma(-3) between the magnetic field and the bulk Lorentz factor.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Yotam Nagar, Uri Keshet
Summary: The spectral index s of high-energy particles diffusively accelerated in a non-magnetized relativistic shock depends on the unknown angular diffusion function D, which itself depends on the particle distribution function f. The local D( f) dependence is shown to have effects on s, the angular distribution, and the particle confinement at the shock, but variations in s remain modest even when D is a strong function of f.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
A. Rossi, B. Rothberg, E. Palazzi, D. A. Kann, P. D'Avanzo, L. Amati, S. Klose, A. Perego, E. Pian, C. Guidorzi, A. S. Pozanenko, S. Savaglio, G. Stratta, G. Agapito, S. Covino, F. Cusano, V. D'Elia, M. De Pasquale, M. Della Valle, O. Kuhn, L. Izzo, E. Loffredo, N. Masetti, A. Melandri, P. Y. Minaev, A. Nicuesa Guelbenzu, D. Paris, S. Paiano, C. Plantet, F. Rossi, R. Salvaterra, S. Schulze, C. Veillet, A. A. Volnova
Summary: This study reports on a peculiar gamma-ray burst (GRB 200826A) that, despite being classified as a short event, exhibits energetic and soft characteristics similar to long GRBs. Observations of the host galaxy reveal it to be a typical low-mass star-forming galaxy, challenging previous assumptions about GRB progenitor classes.
ASTROPHYSICAL JOURNAL
(2022)
Correction
Astronomy & Astrophysics
S. Dichiara, E. Troja, P. Beniamini, B. O'Connor, M. Moss, A. Y. Lien, R. Ricci, L. Amati, G. Ryan, T. Sakamoto
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
M. Shrestha, I. A. Steele, S. Kobayashi, R. J. Smith, C. Guidorzi, N. Jordana-Mitjans, H. Jermak, D. Arnold, C. G. Mundell, A. Gomboc
Summary: This study presents photometric and polarimetric measurements of gamma-ray burst optical afterglows observed by the RINGO3 imaging polarimeter. The researchers find no clear correlation between polarization properties and sample properties and suggest that larger samples are needed for a better understanding of GRB magnetic fields.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Humphrey, L. Bisigello, P. A. C. Cunha, M. Bolzonella, S. Fotopoulou, K. Caputi, C. Tortora, G. Zamorani, P. Papaderos, D. Vergani, J. Brinchmann, M. Moresco, A. Amara, N. Auricchio, M. Baldi, R. Bender, D. Bonino, E. Branchini, M. Brescia, S. Camera, V. Capobianco, C. Carbone, J. Carretero, F. J. Castander, M. Castellano, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, F. Courbin, M. Cropper, A. Da Silva, H. Degaudenzi, M. Douspis, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Farrens, S. Ferriol, M. Frailis, E. Franceschi, M. Fumana, P. Gomez-Alvarez, S. Galeotta, B. Garilli, W. Gillard, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, W. Holmes, F. Hormuth, K. Jahnke, M. Kuemmel, S. Kermiche, A. Kiessling, M. Kilbinger, T. Kitching, R. Kohley, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I. Lloro, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, F. Marulli, R. Massey, S. Maurogordato, H. J. McCracken, E. Medinaceli, M. Melchior, M. Meneghetti, E. Merlin, G. Meylan, L. Moscardini, E. Munari, R. Nakajima, S. M. Niemi, J. Nightingale, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, V. Pettorino, S. Pires, M. Poncet, L. Popa, L. Pozzetti, F. Raison, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, M. Roncarelli, E. Rossetti, R. Saglia, D. Sapone, B. Sartoris, R. Scaramella, P. Schneider, M. Scodeggio, A. Secroun, G. Seidel, C. Sirignano, G. Sirri, L. Stanco, P. Tallada-Crespi, D. Tavagnacco, A. N. Taylor, I. Tereno, R. Toledo-Moreo, F. Torradeflot, I. Tutusaus, L. Valenziano, T. Vassallo, Y. Wang, J. Weller, A. Zacchei, J. Zoubian, S. Andreon, S. Bardelli, A. Boucaud, R. Farinelli, J. Gracia-Carpio, D. Maino, N. Mauri, S. Mei, N. Morisset, F. Sureau, M. Tenti, A. Tramacere, E. Zucca, C. Baccigalupi, A. Balaguera-Antolinez, A. Biviano, A. Blanchard, S. Borgani, E. Bozzo, C. Burigana, R. Cabanac, A. Cappi, C. S. Carvalho, S. Casas, G. Castignani, C. Colodro-Conde, A. R. Cooray, J. Coupon, H. M. Courtois, O. Cucciati, S. Davini, G. De Lucia, H. Dole, J. A. Escartin, S. Escoffier, M. Fabricius, M. Farina, F. Finelli, K. Ganga, J. Garcia-Bellido, K. George, F. Giacomini, G. Gozaliasl, I. Hook, M. Huertas-Company, B. Joachimi, V. Kansal, A. Kashlinsky, E. Keihanen, C. C. Kirkpatrick, V. Lindholm, G. Mainetti, R. Maoli, S. Marcin, M. Martinelli, N. Martinet, M. Maturi, R. B. Metcalf, G. Morgante, A. A. Nucita, L. Patrizii, A. Peel, J. E. Pollack, V. Popa, C. Porciani, D. Potter, P. Reimberg, A. G. Sanchez, M. Schirmer, M. Schultheis, V. Scottez, E. Sefusatti, J. Stadel, R. Teyssier, C. Valieri, J. Valiviita, M. Viel, F. Calura, H. Hildebrandt
Summary: The Euclid Space Telescope will provide deep imaging and spectroscopy across a large area of the sky, enabling the detection of billions of astronomical sources. To analyze this vast dataset, a novel machine-learning-based methodology called ARIADNE pipeline has been developed. This pipeline combines multiple learning methods to achieve higher accuracy in classifying quiescent galaxies and deriving photometric redshifts.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Fiamma Capitanio, Sergio Fabiani, Andrea Gnarini, Francesco Ursini, Carlo Ferrigno, Giorgio Matt, Juri Poutanen, Massimo Cocchi, Romana Mikusincova, Ruben Farinelli, Stefano Bianchi, Jari J. E. Kajava, Fabio Muleri, Celia Sanchez-Fernandez, Paolo Soffitta, Kinwah Wu, Ivan Agudo, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Simone Castellano, Elisabetta Cavazzuti, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccolo Di Lalla, Alessandro Di Marco, Immacolata Donnarumma, Victor Doroshenko, Michal Dovciak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Svetlana G. Jorstad, Vladimir Karas, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Alan P. Marscher, Herman L. Marshall, Ikuyuki Mitsuishi, Tsunefumi Mizuno, C. -Y. Ng, Stephen L. O'Dell, Nicola Omodei, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Andrea Possenti, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Roger W. Romani, Carmelo Sgro, Patrick Slane, Gloria Spandre, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey S. Tsygankov, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Fei Xie, Silvia Zane
Summary: The launch of IXPE on December 9, 2021 has provided a new perspective in X-ray astronomy. In this study, we present the first observation results of GS 1826-238, a weakly magnetized neutron star, using IXPE on March 29-31, 2022. The upper limit of linear polarization degree (99.73% confidence level) is found to be 1.3% in the energy range of 2-8 keV. Coordinated observations with INTEGRAL and NICER were conducted simultaneously to constrain the geometry and inclination angle of GS 1826-238.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
N. Jordana-Mitjans, C. G. Mundell, C. Guidorzi, R. J. Smith, E. Ramirez-Ruiz, B. D. Metzger, S. Kobayashi, A. Gomboc, I. A. Steele, M. Shrestha, M. Marongiu, A. Rossi, B. Rothberg
Summary: This study reports the earliest discovery of bright thermal optical emission associated with short GRB 180618A. The observations suggest that the bright thermal optical counterpart is powered by a rapidly spinning and highly magnetized neutron star, indicating the possible survival of neutron stars after the merger and their ability to power the GRB.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
R. Farinelli, S. Fabiani, J. Poutanen, F. Ursini, C. Ferrigno, S. Bianchi, M. Cocchi, F. Capitanio, A. De Rosa, A. Gnarini, F. Kislat, G. Matt, R. Mikusincova, F. Muleri, I. Agudo, L. A. Antonelli, M. Bachetti, L. Baldini, W. H. Baumgartner, R. Bellazzini, S. D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, S. Castellano, E. Cavazzuti, S. Ciprini, E. Costa, E. Del Monte, L. Di Gesu, N. Di Lalla, A. Di Marco, I. Donnarumma, V. Doroshenko, M. Dovciak, S. R. Ehlert, T. Enoto, Y. Evangelista, R. Ferrazzoli, J. A. Garcia, S. Gunji, K. Hayashida, J. Heyl, W. Iwakiri, S. G. Jorstad, V. Karas, T. Kitaguchi, J. J. Kolodziejczak, H. Krawczynski, F. La Monaca, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. P. Marscher, H. L. Marshall, I. Mitsuishi, T. Mizuno, C-Y Ng, S. L. O'Dell, N. Omodei, C. Oppedisano, A. Papitto, G. G. Pavlov, A. L. Peirson, M. Perri, M. Pesce-Rollins, P. O. Petrucci, M. Pilia, A. Possenti, S. Puccetti, B. D. Ramsey, J. Rankin, A. Ratheesh, R. W. Romani, C. Sgro, P. Slane, P. Soffitta, G. Spandre, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A. F. Tennant, N. E. Thomas, F. Tombesi, A. Trois, S. S. Tsygankov, R. Turolla, J. Vink, M. C. Weisskopf, K. Wu, F. Xie, S. Zane
Summary: We present the spectro-polarimetric results of the Cyg X-2 neutron star low-mass X-ray binary observed by IXPE, NICER, and INTEGRAL simultaneously. The broadband spectrum consists of a lower-energy component from the accretion disc and Comptonized emission from a thermal plasma. The polarization measurements in the 2-8 keV band show consistency with previous observations and suggest a spreading layer at the neutron star surface as the main source of the polarization signal.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Trudu, M. Pilia, L. Nicastro, C. Guidorzi, M. Orlandini, L. Zampieri, V. R. Marthi, F. Ambrosino, A. Possenti, M. Burgay, C. Casentini, I. Mereminskiy, V. Savchenko, E. Palazzi, F. Panessa, A. Ridolfi, F. Verrecchia, M. Anedda, G. Bernardi, M. Bachetti, R. Burenin, A. Burtovoi, P. Casella, M. Fiori, F. Frontera, V. Gajjar, A. Gardini, M. Ge, A. Guijarro-Roman, A. Ghedina, I. Hermelo, S. Jia, C. Li, J. Liao, X. Li, F. Lu, A. Lutovinov, G. Naletto, P. Ochner, A. Papitto, M. Perri, C. Pittori, B. Safonov, A. Semena, I. Strakhov, M. Tavani, A. Ursi, S. L. Xiong, S. N. Zhang, S. Zheltoukhov
Summary: By conducting a multi-wavelength observational campaign, we detected 14 new radio bursts and provided the deepest prompt upper limits in the optical band for FRB 20180916B. Additionally, we performed joint observations of a radio burst using the SRT and Insight-HXMT X-ray detector.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Justyn R. Maund, Peter A. Hoflich, Iain A. Steele, Yi Yang, Klaas Wiersema, Shiho Kobayashi, Nuria Jordana-Mitjans, Carole Mundell, Andreja Gomboc, Cristiano Guidorzi, Robert J. Smith
Summary: The Liverpool telescope RINGO3 observed AT2018cow, the closest example of fast blue optical transients (FBOTs), and recorded the highest intrinsic polarization for a non-relativistic explosive transient. The polarization showed a chromatic spike at red wavelengths at 5.7 days post-explosion, before rapidly declining. Another polarization "bump" was observed at blue wavelengths at approximately 12 days, indicating an extremely aspherical geometry for a brief period.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alessandro Di Marco, Fabio La Monaca, Juri Poutanen, Thomas Russell, Alessio Anitra, Ruben Farinelli, Guglielmo Mastroserio, Fabio Muleri, Fei Xie, Matteo Bachetti, Luciano Burderi, Francesco Carotenuto, Melania Del Santo, Tiziana Di Salvo, Michal Dovciak, Andrea Gnarini, Rosario Iaria, Jari J. E. Kajava, Kuan Liu, Riccardo L. Middei, Stephen O'Dell, Maura Pilia, John Rankin, Andrea Sanna, Jakob van den Eijnden, Martin C. Weisskopf, Anna Bobrikova, Fiamma Capitanio, Enrico Costa, Philip Kaaret, Alessio Marino, Paolo Soffitta, Francesco Ursini, Filippo Ambrosino, Massimo Cocchi, Sergio Fabiani, Herman Marshall, Giorgio Matt, Sara Elisa Motta, Alessandro Papitto, Luigi Stella, Antonella Tarana, Silvia Zane, Ivan Agudo, Lucio A. Antonelli, Luca H. Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccolo Di Lalla, Immacolata Donnarumma, Victor Doroshenko, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Svetlana G. Jorstad, Vladimir Karas, Fabian Kislat, Takao J. Kitaguchi, Jeffery Kolodziejczak, Henric Krawczynski, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Alan P. Marscher, Francesco Massaro, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Michela Negro, Chi-Yung Ng, Nicola Omodei, Chiara G. Oppedisano, George L. Pavlov, Abel Peirson, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Andrea Possenti, Simonetta D. Puccetti, Brian Ramsey, Ajay J. Ratheesh, Oliver W. Roberts, Roger Romani, Carmelo Sgro, Patrick Slane, Gloria Spandre, Douglas A. Swartz, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru F. Tawara, Allyn E. Tennant, Nicholas Thomas, Francesco Tombesi, Alessio Trois, Sergey Tsygankov, Roberto Turolla, Jacco Vink, Kinwah Wu
Summary: This paper reports the first detection of polarization in the X-rays for atoll-source 4U 1820-303, obtained with the Imaging X-ray Polarimetry Explorer (IXPE) at a 99.999% confidence level. The source shows a significant polarization above 4 keV, with the polarization degree increasing with energy. The spectro-polarimetric fit indicates an orthogonal polarization direction between the hard spectral component and the accretion disk.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
M. F. Sousa, J. G. Coelho, J. C. N. de Araujo, C. Guidorzi, J. A. Rueda
Summary: This article characterizes the optical transient expected from double white dwarf mergers and presents simulations of the light curves, spectra, and color evolution of the transient. Based on the estimated merger rate, the absence of detection in current transient surveys is consistent. However, the Legacy Survey of Space and Time of the Vera C. Rubin Observatory is likely to detect several hundred mergers per year, providing a new opportunity to study white dwarfs, neutron stars, and Type Ia supernovae.
ASTROPHYSICAL JOURNAL
(2023)
Proceedings Paper
Engineering, Aerospace
Thierry Maciaszek, Anne Ealet, William Gillard, Knud Jahnke, Remi Barbier, Eric Prieto, William Bon, Anne Bonnefoi, Amandine Caillat, Michael Carle, Anne Costille, Franck Ducret, Christophe Fabfro, Benjamin Foulon, Jean-luc Gimenez, Emmanuel Grassi, Marc Jaquet, David Lemignant, Laurent Martin, Pamplona Tony, Patrice Sanchez, Clement Jean-Claude, Laurence Caillat, Niclas Mathieu, A. Secroun, Bogna Kubik, Sylvain Ferriol, Michel Berthe, Jean-Christophe Barriere, Jean Fontignie, Luca Valenziano, Natalia Auricchio, Paola Battaglia, Adriano Derosa, Ruben Farinelli, Enrico Franceschi, Eduardo Medinaceli, Gianluca Morgante, Francesca Sortino, Massimo Trifoglio, Leonardo Corcione, Vito Capobianco, Sebastiano Ligori, Stefano Dusini, Enrico Borsato, Flavio Dalcorso, Fulvio Laudisio, Chiara Sirignano, Luca Stanco, Sandro Ventura, Laura Patrizii, Tommaso Chiarusi, Federico Fornari, Francesco Giacomini, Annarita Margiotta, Nicoletta Mauri, Laura Pasqualini, Gabriele Sirri, Maurizio Spurio, Matteo Tenti, Riccardo Travaglini, Carlota Bonoli, Favio Bortoletto, Andrea Balestra, Maurizio Dalessandro, Frank Grupp, Daniela Penka, Jorg Steinwagner, Felix Hormuth, Mischa Schirmer, Gregor Seidel, Cristobal Padilla, Ricardo Casas, Yvan Lloro, Rafael Toledo, Jaime Gomez, C. Colodro, D. Lizan, Jose Javier Diaz, Per Lilje, M. Andersen, Jeppe Andersen, Anton Sorensen, Allan Hornstrup, Niels C. Jessen, Cedric Thizy, Warren Holmes, Moshe Pniel, Murzy Jhabvala, Steven Pravdo, Michael Seiffert, Augustyn Waczynski, Rene Laureij, Giuseppe Racca, Jean-Christophe Salvignol, Tobias Boenke, Paolo Strada, Yannick Mellier
Summary: This paper presents the final architecture and subsystems of the NISP instrument, along with the performance and ground calibration measurements conducted at operational cold temperature.
SPACE TELESCOPES AND INSTRUMENTATION 2022: OPTICAL, INFRARED, AND MILLIMETER WAVE
(2022)
Proceedings Paper
Engineering, Aerospace
E. Medinaceli, L. Valenziano, N. Auricchio, E. Franceschi, F. Gianotti, P. Battaglia, R. Farinelli, A. Balestra, S. Dusini, C. Sirignano, E. Borsato, L. Stanco, A. Renzi, A. Troja, L. Gabarra, S. Ligori, C. Capobianco, L. Corcione, D. Bonino, G. Sirri, L. Patrizii, M. Tenti, D. Di Ferdinando, C. Valieri, N. Mauri, F. Giacomini, D. Le Mignant, E. Prieto, M. Cade, F. Ducret, W. Gillard, A. Secroun, T. Maciaszek, S. Ferriol, R. Barbier, F. Grupp, W. Holmes, M. Pniel, A. Waczynski, S. Prado, M. Seiffert, M. Jhabvala, R. J. Laureijs, G. Racca, J. C. Salvignol, T. Boenke, P. Strada
Summary: This article introduces the final integration stage of the Euclid mission and the performance and processing of NISP. The article also describes the solution to a critical issue discovered during the final test phase, and presents the survey scope and statistical data of Euclid.
SPACE TELESCOPES AND INSTRUMENTATION 2022: OPTICAL, INFRARED, AND MILLIMETER WAVE
(2022)
Article
Astronomy & Astrophysics
Giulia Stratta, Lorenzo Amati, Marica Branchesi, Riccardo Ciolfi, Nial Tanvir, Enrico Bozzo, Diego Gotz, Paul O'Brien, Andrea Santangelo
Summary: The mission concept aims to explore the early Universe using Gamma-Ray Bursts and become a cornerstone of multi-messenger and time-domain astrophysics. Key features include the capability to survey and detect faint and soft Gamma-Ray Bursts that have been poorly explored so far.
