The Radio Counterpart to the Fast X-Ray Transient EP240414a

The Astrophysical Journal American Astronomical Society 981:1 (2025) 48

Authors:

Joe S Bright, Francesco Carotenuto, Rob Fender, Carmen Choza, Andrew Mummery, Peter G Jonker, Stephen J Smartt, David R DeBoer, Wael Farah, James Matthews, Alexander W Pollak, Lauren Rhodes, Andrew Siemion

Abstract:

Despite being operational for only a short time, the Einstein Probe mission, with its large field of view and rapid localization capabilities, has already significantly advanced the study of rapid variability in the soft X-ray sky. We report the discovery of luminous and variable radio emission from the Einstein Probe fast X-ray transient EP240414a, the second such source with a radio counterpart. The radio emission at 3 GHz peaks at ∼30 days postexplosion and with a spectral luminosity ∼2 × 1030 erg s−1 Hz−1, similar to what is seen from long gamma-ray bursts, and distinct from other extragalactic transients including supernovae and tidal disruption events, although we cannot completely rule out emission from engine driven stellar explosions, e.g., the fast blue optical transients. An equipartition analysis of our radio data reveals that an outflow with at least a moderate bulk Lorentz factor (Γ ≳ 1.6) with a minimum energy of ∼1048 erg is required to explain our observations. The apparent lack of a reported gamma-ray counterpart to EP240414a could suggest that an off-axis or choked jet could be responsible for the radio emission, although a low-luminosity gamma-ray burst may have gone undetected. Our observations are consistent with the hypothesis that a significant fraction of extragalactic fast X-ray transients are associated with the deaths of massive stars.

The track-length extension fitting algorithm for energy measurement of interacting particles in liquid argon TPCs and its performance with ProtoDUNE-SP data

Journal of Instrumentation IOP Publishing 20:02 (2025) P02021

Authors:

A Abed Abud, B Abi, R Acciarri, MA Acero, MR Adames, G Adamov, M Adamowski, D Adams, M Adinolfi, C Adriano, A Aduszkiewicz, J Aguilar, F Akbar, NS Alex, K Allison, S Alonso Monsalve, M Alrashed, A Alton, R Alvarez, T Alves, H Amar, P Amedo, J Anderson, C Andreopoulos, F Azfar

Abstract:

This paper introduces a novel track-length extension fitting algorithm for measuring the kinetic energies of inelastically interacting particles in liquid argon time projection chambers (LArTPCs). The algorithm finds the most probable offset in track length for a track-like object by comparing the measured ionization density as a function of position with a theoretical prediction of the energy loss as a function of the energy, including models of electron recombination and detector response. The algorithm can be used to measure the energies of particles that interact before they stop, such as charged pions that are absorbed by argon nuclei. The algorithm's energy measurement resolutions and fractional biases are presented as functions of particle kinetic energy and number of track hits using samples of stopping secondary charged pions in data collected by the ProtoDUNE-SP detector, and also in a detailed simulation. Additional studies describe the impact of the dE/dx model on energy measurement performance. The method described in this paper to characterize the energy measurement performance can be repeated in any LArTPC experiment using stopping secondary charged pions.

Measurement of the associated production of a top-antitop-quark pair and a Higgs boson decaying into a bb¯ pair in pp collisions at s=13 TeV using the ATLAS detector at the LHC

European Physical Journal C Springer Nature 85:2 (2025) 210

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala, A Aggarwal, C Agheorghiesei, F Ahmadov, WS Ahmed, S Ahuja, X Ai, G Aielli, A Aikot, M Ait Tamlihat, B Aitbenchikh, M Akbiyik, TPA Åkesson, AV Akimov, D Akiyama, NN Akolkar, S Aktas, K Al Khoury, GL Alberghi, J Albert, P Albicocco, GL Albouy, S Alderweireldt, ZL Alegria, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, F Alfonsi, M Algren, M Alhroob, B Ali, HMJ Ali, S Ali, SW Alibocus, M Aliev, G Alimonti, W Alkakhi, C Allaire, BMM Allbrooke, JS Allen, JF Allen, CA Allendes Flores, PP Allport, A Aloisio, F Alonso, C Alpigiani, ZMK Alsolami, M Alvarez Estevez, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, A Ambler, C Amelung, M Amerl, CG Ames, D Amidei, B Amini, KJ Amirie, SP Amor Dos Santos, KR Amos, D Amperiadou, S An, V Ananiev, C Anastopoulos, T Andeen, JK Anders, AC Anderson, SY Andrean, A Andreazza, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, E Antipov, M Antonelli, F Anulli, M Aoki, T Aoki, MA Aparo, L Aperio Bella, C Appelt, A Apyan, SJ Arbiol Val, C Arcangeletti, ATH Arce, J-F Arguin, S Argyropoulos, J-H Arling, O Arnaez, H Arnold, G Artoni, H Asada, K Asai, S Asai, NA Asbah, RA Ashby Pickering, K Assamagan, R Astalos, KSV Astrand, S Atashi, RJ Atkin, M Atkinson, H Atmani, PA Atmasiddha, K Augsten, S Auricchio, AD Auriol, VA Austrup, G Avolio, K Axiotis, G Azuelos, D Babal, H Bachacou, K Bachas, A Bachiu, E Bachmann, F Backman, A Badea, TM Baer, P Bagnaia, M Bahmani, D Bahner, K Bai, JT Baines, L Baines, OK Baker, E Bakos, D Bakshi Gupta, LE Balabram Filho, V Balakrishnan, R Balasubramanian, EM Baldin, P Balek, E Ballabene, F Balli, LM Baltes, WK Balunas, J Balz, I Bamwidhi, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, M Barakat, EL Barberio, D Barberis, M Barbero, MZ Barel, T Barillari, M-S Barisits, T Barklow, P Baron, DA Baron Moreno, A Baroncelli, AJ Barr, JD Barr, F Barreiro, J Barreiro Guimarães da Costa, U Barron, MG Barros Teixeira, S Barsov, F Bartels, R Bartoldus, AE Barton, P Bartos, A Basan, M Baselga, A Bassalat, MJ Basso, S Bataju, R Bate, RL Bates, S Batlamous, B Batool, M Battaglia, D Battulga, M Bauce, M Bauer, P Bauer, LT Bazzano Hurrell, JB Beacham, T Beau, JY Beaucamp, PH Beauchemin, P Bechtle, HP Beck, K Becker, AJ Beddall, VA Bednyakov, CP Bee, LJ Beemster, TA Beermann, M Begalli, M Begel, A Behera, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, D Benchekroun, F Bendebba, Y Benhammou, KC Benkendorfer, L Beresford, M Beretta, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, G Bernardi, C Bernius, FU Bernlochner, F Bernon, A Berrocal Guardia, T Berry, P Berta, A Berthold, S Bethke, A Betti, AJ Bevan, NK Bhalla, S Bhatta, DS Bhattacharya, P Bhattarai, KD Bhide, VS Bhopatkar, RM Bianchi, G Bianco, O Biebel, R Bielski, M Biglietti, CS Billingsley, Y Bimgdi, M Bindi, A Bingul, C Bini, GA Bird, M Birman, M Biros, S Biryukov, T Bisanz, E Bisceglie, JP Biswal, D Biswas, I Bloch, A Blue, U Blumenschein, J Blumenthal, VS Bobrovnikov, M Boehler, B Boehm, D Bogavac, AG Bogdanchikov, LS Boggia, C Bohm, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, CD Booth, AG Borbély, IS Bordulev, G Borissov, D Bortoletto, D Boscherini, M Bosman, JD Bossio Sola, K Bouaouda, N Bouchhar, L Boudet, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, L Bozianu, J Bracinik, N Brahimi, G Brandt, O Brandt, F Braren, B Brau, JE Brau, R Brener, L Brenner, R Brenner, S Bressler, G Brianti, D Britton, D Britzger, I Brock, R Brock, G Brooijmans, EM Brooks, E Brost, LM Brown, LE Bruce, TL Bruckler, PA Bruckman de Renstrom, B Brüers, A Bruni, G Bruni, M Bruschi, N 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Cavaliere, V Cavaliere, N Cavalli, LJ Caviedes Betancourt, YC Cekmecelioglu, E Celebi, S Cella, MS Centonze, V Cepaitis, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, B Cervato, A Cervelli, G Cesarini, SA Cetin, D Chakraborty, J Chan, WY Chan, JD Chapman, E Chapon, B Chargeishvili, DG Charlton, M Chatterjee, C Chauhan, Y Che, S Chekanov, SV Chekulaev, GA Chelkov, A Chen, B Chen, B Chen, H Chen, H Chen, J Chen, J Chen, M Chen, S Chen, SJ Chen, X Chen, X Chen, Y Chen, CL Cheng, HC Cheng, S Cheong, A Cheplakov, E Cheremushkina, E Cherepanova, R Cherkaoui El Moursli, E Cheu, K Cheung, L Chevalier, V Chiarella, G Chiarelli, N Chiedde, G Chiodini, AS Chisholm, A Chitan, M Chitishvili, MV Chizhov, K Choi, Y Chou, EYS Chow, KL Chu, MC Chu, X Chu, Z Chubinidze, J Chudoba, JJ Chwastowski, D Cieri, KM Ciesla, V Cindro, A Ciocio, F Cirotto, ZH Citron, M Citterio, DA Ciubotaru, A Clark, PJ Clark, N Clarke Hall, C Clarry, JM Clavijo Columbie, SE Clawson, C Clement, Y Coadou, M Cobal, A Coccaro, RF Coelho Barrue, R Coelho Lopes De, S Coelli, LS Colangeli, B Cole, J Collot, P Conde Muiño, MP Connell, SH Connell, EI Conroy, F Conventi, HG Cooke, AM Cooper-Sarkar, FA Corchia, A Cordeiro Oudot Choi, LD Corpe, M Corradi, F Corriveau, A Cortes-Gonzalez, MJ Costa, F Costanza, D Costanzo, BM Cote, J Couthures, G Cowan, K Cranmer, L Cremer, D Cremonini, S Crépé-Renaudin, F Crescioli, M Cristinziani, M Cristoforetti, V Croft, JE Crosby, G Crosetti, A Cueto, H Cui, Z Cui, WR Cunningham, F Curcio, JR Curran, P Czodrowski, MJ Da Cunha Sargedas De Sousa, JV Da Fonseca Pinto, C Da Via, W Dabrowski, T Dado, S Dahbi, T Dai, D Dal Santo, C Dallapiccola, M Dam, G D’amen, V D’Amico, J Damp, JR Dandoy, D Dannheim, M Danninger, V Dao, G Darbo, SJ Das, F Dattola, S D’Auria, A D’Avanzo, C David, T Davidek, I Dawson, HA Day-hall, K De, R De Asmundis, N De Biase, S De Castro, N De Groot, P de Jong, H De la Torre, A De Maria, A De Salvo, U De Sanctis, F De Santis, A De Santo, JB De Vivie De 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Dubinin, M Dubovsky, E Duchovni, G Duckeck, OA Ducu, D Duda, A Dudarev, ER Duden, M D’uffizi, L Duflot, M Dührssen, I Duminica, AE Dumitriu, M Dunford, S Dungs, K Dunne, A Duperrin, H Duran Yildiz, M Düren, A Durglishvili, BL Dwyer, GI Dyckes, M Dyndal, BS Dziedzic, ZO Earnshaw, GH Eberwein, B Eckerova, S Eggebrecht, E Egidio Purcino De Souza, LF Ehrke, G Eigen, K Einsweiler, T Ekelof, PA Ekman, S El Farkh, Y El Ghazali, H El Jarrari, A El Moussaouy, V Ellajosyula, M Ellert, F Ellinghaus, N Ellis, J Elmsheuser, M Elsawy, M Elsing, D Emeliyanov, Y Enari, I Ene, S Epari, PA Erland, D Ernani Martins Neto, M Errenst, M Escalier, C Escobar, E Etzion, G Evans, H Evans, LS Evans, A Ezhilov, S Ezzarqtouni, F Fabbri, L Fabbri, G Facini, V Fadeyev, RM Fakhrutdinov, D Fakoudis, S Falciano, LF Falda Ulhoa Coelho, F Fallavollita, G Falsetti, J Faltova, C Fan, KY Fan, Y Fan, Y Fang, M Fanti, M Faraj, Z Farazpay, A Farbin, A Farilla, T Farooque, SM Farrington, F Fassi, D Fassouliotis, M Faucci 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Robust cosmic shear with small-scale nulling

(2025)

Authors:

Giulia Piccirilli, Matteo Zennaro, Carlos García-García, David Alonso

SN 2023zaw: The Low-energy Explosion of an Ultrastripped Star

The Astrophysical Journal Letters American Astronomical Society 980:2 (2025) L44

Authors:

T Moore, JH Gillanders, M Nicholl, ME Huber, SJ Smartt, S Srivastav, HF Stevance, T-W Chen, KC Chambers, JP Anderson, MD Fulton, SR Oates, C Angus, G Pignata, N Erasmus, H Gao, J Herman, C-C Lin, T Lowe, EA Magnier, P Minguez, C-C Ngeow, X Sheng, SA Sim

Abstract:

Most stripped-envelope supernova progenitors are thought to be formed through binary interaction, losing hydrogen and/or helium from their outer layers. Ultrastripped supernovae are an emerging class of transient that are expected to be produced through envelope stripping by a neutron star companion. However, relatively few examples are known, and the outcomes of such systems can be diverse and are poorly understood at present. Here we present spectroscopic observations and high-cadence, multiband photometry of SN 2023zaw, a rapidly evolving supernova with a low ejecta mass. SN 2023zaw was discovered in a nearby spiral galaxy at D = 39.7 Mpc. It has significant Milky Way extinction, E(B − V)MW = 0.21, and significant (but uncertain) host extinction. Bayesian evidence comparison reveals that nickel is not the only power source and that an additional energy source is required to explain our observations. Our models suggest that an ejecta mass of Mej ∼ 0.07 M⊙ and a synthesised nickel mass of MNi ∼ 0.007 M⊙ are required to explain the observations. We find that additional heating from a central engine, or interaction with circumstellar material, can power the early light curve.