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Optical follow-up of the neutron star-black hole mergers S200105ae and S200115j

LIGO and Virgo's third observing run (O3) revealed the first neutron star-black hole (NSBH) merger candidates in gravitational waves. These events are predicted to synthesize r-process elements creating optical/near-IR "kilonova" (KN)…

High Energy Astrophysical Phenomena · Physics 2020-09-16 Shreya Anand , Michael W. Coughlin , Mansi M. Kasliwal , Mattia Bulla , Tomás Ahumada , Ana Sagués Carracedo , Mouza Almualla , Igor Andreoni , Robert Stein , Francois Foucart , Leo P. Singer , Jesper Sollerman , Eric C. Bellm , Bryce Bolin , M. D. Caballero-García , Alberto J. Castro-Tirado , S. Bradley Cenko , Kishalay De , Richard G. Dekany , Dmitry A. Duev , Michael Feeney , Christoffer Fremling , Daniel A. Goldstein , V. Zach Golkhou , Matthew J. Graham , Nidhal Guessoum , Matthew J. Hankins , Youdong Hu , Albert K. H. Kong , Erik C. Kool , S. R. Kulkarni , Harsh Kumar , Russ R. Laher , Frank J. Masci , Przemek Mróz , Samaya Nissanke , Michael Porter , Simeon Reusch , Reed Riddle , Philippe Rosnet , Ben Rusholme , Eugene Serabyn , R. Sánchez-Ramírez , Mickael Rigault , David L. Shupe , Roger Smith , Maayane T. Soumagnac , Richard Walters , Azamat F. Valeev

Super-Knee Cosmic Rays from Galactic Neutron Star Merger Remnants

The detection of gravitational waves and electromagnetic counterparts from a binary neutron star (BNS) merger confirmed that it is accompanied by the launch of fast merger ejecta. Analogous to supernova remnants, forward shocks formed by…

High Energy Astrophysical Phenomena · Physics 2018-10-12 Shigeo S. Kimura , Kohta Murase , Peter Mészáros

A simulation study on the sub-threshold joint gravitational wave-electromagnetic wave observation on binary neutron star mergers

The coalescence of binary neutron stars (BNS) is a prolific source of gravitational waves (GWs) and electromagnetic (EM) radiation, offering a dual observational window into the Universe. Lowering the signal-to-noise ratio (S/N) threshold…

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Measuring Dark Energy Properties with Photometrically Classified Pan-STARRS Supernovae. II. Cosmological Parameters

We use 1169 Pan-STARRS supernovae (SNe) and 195 low-$z$ ($z < 0.1$) SNe Ia to measure cosmological parameters. Though most Pan-STARRS SNe lack spectroscopic classifications, in a previous paper (I) we demonstrated that photometrically…

Cosmology and Nongalactic Astrophysics · Physics 2018-04-25 D. O. Jones , D. M. Scolnic , A. G. Riess , A. Rest , R. P. Kirshner , E. Berger , R. Kessler , Y. -C. Pan , R. J. Foley , R. Chornock , C. A. Ortega , P. J. Challis , W. S. Burgett , K. C. Chambers , P. W. Draper , H. Flewelling , M. E. Huber , N. Kaiser , R. -P. Kudritzki , N. Metcalfe , J. Tonry , R. J. Wainscoat , C. Waters , E. E. E. Gall , R. Kotak , M. McCrum , S. J. Smartt , K. W. Smith

Neutron-powered precursors of kilonovae

The merger of binary neutron stars (NSs) ejects a small quantity of neutron rich matter, the radioactive decay of which powers a day to week long thermal transient known as a kilonova. Most of the ejecta remains sufficiently dense during…

High Energy Astrophysical Phenomena · Physics 2015-06-22 Brian D. Metzger , Andreas Bauswein , Stephane Goriely , Daniel Kasen

Engine-fed Kilonovae (Mergernovae) -- II. Radiation

The radioactive power generated by materials within the ejecta of a binary-neutron-star (BNS) merger powers an optical transient known as a kilonova. When the central remnant of a BNS merger is a long-lived magnetar, it continuously…

High Energy Astrophysical Phenomena · Physics 2024-10-22 Shunke Ai , He Gao , Bing Zhang

Prospects for optical detections from binary neutron star mergers with the next-generation multi-messenger observatories

Next-generation gravitational wave (GW) observatories, such as the Einstein Telescope (ET) and Cosmic Explorer, will observe binary neutron star (BNS) mergers across cosmic history, providing precise parameter estimates for the closest…

High Energy Astrophysical Phenomena · Physics 2025-05-07 E. Loffredo , N. Hazra , U. Dupletsa , M. Branchesi , S. Ronchini , F. Santoliquido , A. Perego , B. Banerjee , S. Bisero , G. Ricigliano , S. Vergani , I. Andreoni , M. Cantiello , J. Harms , M. Mapelli , G. Oganesyan

Constraining inputs to realistic kilonova simulations through comparison to observed $r$-process abundances

Kilonovae, one source of electromagnetic emission associated with neutron star mergers, are powered by the decay of radioactive isotopes in the neutron-rich merger ejecta. Models for kilonova emission consistent with the electromagnetic…

High Energy Astrophysical Phenomena · Physics 2023-06-06 M. Ristic , E. M. Holmbeck , R. Wollaeger , O. Korobkin , E. Champion , R. O'Shaughnessy , C. L. Fryer , C. J. Fontes , M. R. Mumpower , T. M. Sprouse

The Dark Energy Survey: Cosmology Results With ~1500 New High-redshift Type Ia Supernovae Using The Full 5-year Dataset

We present cosmological constraints from the sample of Type Ia supernovae (SN Ia) discovered during the full five years of the Dark Energy Survey (DES) Supernova Program. In contrast to most previous cosmological samples, in which SN are…

Cosmology and Nongalactic Astrophysics · Physics 2025-07-22 DES Collaboration , T. M. C. Abbott , M. Acevedo , M. Aguena , A. Alarcon , S. Allam , O. Alves , A. Amon , F. Andrade-Oliveira , J. Annis , P. Armstrong , J. Asorey , S. Avila , D. Bacon , B. A. Bassett , K. Bechtol , P. H. Bernardinelli , G. M. Bernstein , E. Bertin , J. Blazek , S. Bocquet , D. Brooks , D. Brout , E. Buckley-Geer , D. L. Burke , H. Camacho , R. Camilleri , A. Campos , A. Carnero Rosell , D. Carollo , A. Carr , J. Carretero , F. J. Castander , R. Cawthon , C. Chang , R. Chen , A. Choi , C. Conselice , M. Costanzi , L. N. da Costa , M. Crocce , T. M. Davis , D. L. DePoy , S. Desai , H. T. Diehl , M. Dixon , S. Dodelson , P. Doel , C. Doux , A. Drlica-Wagner , J. Elvin-Poole , S. Everett , I. Ferrero , A. Ferté , B. Flaugher , R. J. Foley , P. Fosalba , D. Friedel , J. Frieman , C. Frohmaier , L. Galbany , J. García-Bellido , M. Gatti , E. Gaztanaga , G. Giannini , K. Glazebrook , O. Graur , D. Gruen , R. A. Gruendl , G. Gutierrez , W. G. Hartley , K. Herner , S. R. Hinton , D. L. Hollowood , K. Honscheid , D. Huterer , B. Jain , D. J. James , N. Jeffrey , E. Kasai , L. Kelsey , S. Kent , R. Kessler , A. G. Kim , R. P. Kirshner , E. Kovacs , K. Kuehn , O. Lahav , J. Lee , S. Lee , G. F. Lewis , T. S. Li , C. Lidman , H. Lin , U. Malik , J. L. Marshall , P. Martini , J. Mena-Fernández , F. Menanteau , R. Miquel , J. J. Mohr , J. Mould , J. Muir , A. Möller , E. Neilsen , R. C. Nichol , P. Nugent , R. L. C. Ogando , A. Palmese , Y. -C. Pan , M. Paterno , W. J. Percival , M. E. S. Pereira , A. Pieres , A. A. Plazas Malagón , B. Popovic , A. Porredon , J. Prat , H. Qu , M. Raveri , M. Rodríguez-Monroy , A. K. Romer , A. Roodman , B. Rose , M. Sako , E. Sanchez , D. Sanchez Cid , M. Schubnell , D. Scolnic , I. Sevilla-Noarbe , P. Shah , J. Allyn. Smith , M. Smith , M. Soares-Santos , E. Suchyta , M. Sullivan , N. Suntzeff , M. E. C. Swanson , B. O. Sánchez , G. Tarle , G. Taylor , D. Thomas , C. To , M. Toy , M. A. Troxel , B. E. Tucker , D. L. Tucker , S. A. Uddin , M. Vincenzi , A. R. Walker , N. Weaverdyck , R. H. Wechsler , J. Weller , W. Wester , P. Wiseman , M. Yamamoto , F. Yuan , B. Zhang , Y. Zhang

Asymmetric mass ratios for bright double neutron-star mergers

The discovery of a radioactively powered kilonova associated with the binary neutron star merger GW170817 was the first - and still only - confirmed electromagnetic counterpart to a gravitational-wave event. However, observations of…

High Energy Astrophysical Phenomena · Physics 2020-07-09 R. D. Ferdman , P. C. C. Freire , B. B. P. Perera , N. Pol , F. Camilo , S. Chatterjee , J. M. Cordes , F. Crawford , J. W. T. Hessels , V. M. Kaspi , M. A. McLaughlin , E. Parent , I. H. Stairs , J. van Leeuwen

$r$-process Nucleosynthesis and Kilonovae from Hypermassive Neutron Star Remnants

We investigate $r$-process nucleosynthesis and kilonova emission resulting from binary neutron star (BNS) mergers based on a three-dimensional (3D) general-relativistic magnetohydrodynamic (GRMHD) simulation of a hypermassive neutron star…

High Energy Astrophysical Phenomena · Physics 2022-11-16 Sanjana Curtis , Philipp Mösta , Zhenyu Wu , David Radice , Luke Roberts , Giacomo Ricigliano , Albino Perego

On using the counting method to constrain the anisotropy of kilonova radiation

A large number of binary neutron star (BNS) mergers are expected to be detected by gravitational wave (GW) detectors and the electromagnetic (EM) counterparts (e.g., kilonovae) of a fraction of these mergers may be detected in multi-bands…

High Energy Astrophysical Phenomena · Physics 2024-01-09 Siqi Zhang , Furen Deng , Youjun Lu

Population study of Galactic supernova remnants at very high $\gamma$-ray energies with H.E.S.S.

Shell-type supernova remnants (SNRs) are considered prime candidates for the acceleration of Galactic cosmic rays (CRs) up to the knee of the CR spectrum at $\mathrm{E} \approx \mathrm{3}\times \mathrm{10}^\mathrm{15}$ eV. Our Milky Way…

High Energy Astrophysical Phenomena · Physics 2018-04-25 H. E. S. S. Collaboration , : , H. Abdalla , A. Abramowski , F. Aharonian , F. Ait Benkhali , E. O. Angüner , M. Arakawa , M. Arrieta , P. Aubert , M. Backes , A. Balzer , M. Barnard , Y. Becherini , J. Becker Tjus , D. Berge , S. Bernhard , K. Bernlöhr , R. Blackwell , M. Böttcher , C. Boisson , J. Bolmont , S. Bonnefoy , P. Bordas , J. Bregeon , F. Brun , P. Brun , M. Bryan , M. Büchele , T. Bulik , M. Capasso , S. Caroff , A. Carosi , S. Casanova , M. Cerruti , N. Chakraborty , R. C. G. Chaves , A. Chen , J. Chevalier , S. Colafrancesco , B. Condon , J. Conrad , I. D. Davids , J. Decock , C. Deil , J. Devin , P. deWilt , L. Dirson , A. Djannati-Ataï , A. Donath , L. O'C. Drury , K. Dutson , J. Dyks , T. Edwards , K. Egberts , G. Emery , J. -P. Ernenwein , S. Eschbach , C. Farnier , S. Fegan , M. V. Fernandes , D. Fernandez , A. Fiasson , G. Fontaine , S. Funk , M. Füßling , S. Gabici , Y. A. Gallant , T. Garrigoux , F. Gaté , G. Giavitto , B. Giebels , D. Glawion , J. F. Glicenstein , D. Gottschall , M. -H. Grondin , J. Hahn , M. Haupt , J. Hawkes , G. Heinzelmann , G. Henri , G. Hermann , J. A. Hinton , W. Hofmann , C. Hoischen , T. L. Holch , M. Holler , D. Horns , A. Ivascenko , H. Iwasaki , A. Jacholkowska , M. Jamrozy , D. Jankowsky , F. Jankowsky , M. Jingo , L. Jouvin , I. Jung-Richardt , M. A. Kastendieck , K. Katarzyński , M. Katsuragawa , U. Katz , D. Kerszberg , D. Khangulyan , B. Khélifi , J. King , S. Klepser , D. Klochkov , W. Kluźniak , Nu. Komin , K. Kosack , S. Krakau , M. Kraus , P. P. Krüger , H. Laffon , G. Lamanna , J. Lau , J. -P. Lees , J. Lefaucheur , A. Lemière , M. Lemoine-Goumard , J. -P. Lenain , E. Leser , T. Lohse , M. Lorentz , R. Liu , R. López-Coto , I. Lypova , D. Malyshev , V. Marandon , A. Marcowith , C. Mariaud , R. Marx , G. Maurin , N. Maxted , M. Mayer , P. J. Meintjes , M. Meyer , A. M. W. Mitchell , R. Moderski , M. Mohamed , L. Mohrmann , K. Morå , E. Moulin , T. Murach , S. Nakashima , M. deNaurois , H. Ndiyavala , F. Niederwanger , J. Niemiec , L. Oakes , P. OBrien , H. Odaka , S. Ohm , M. Ostrowski , I. Oya , M. Padovani , M. Panter , R. D. Parsons , N. W. Pekeur , G. Pelletier , C. Perennes , P. -O. Petrucci , B. Peyaud , Q. Piel , S. Pita , V. Poireau , H. Poon , D. Prokhorov , H. Prokoph , G. Pühlhofer , M. Punch , A. Quirrenbach , S. Raab , R. Rauth , A. Reimer , O. Reimer , M. Renaud , R. de los Reyes , F. Rieger , L. Rinchiuso , C. Romoli , G. Rowell , B. Rudak , C. B. Rulten , S. Safi-Harb , V. Sahakian , S. Saito , D. A. Sanchez , A. Santangelo , M. Sasaki , R. Schlickeiser , F. Schüssler , A. Schulz , U. Schwanke , S. Schwemmer , M. Seglar-Arroyo , M. Settimo , A. S. Seyffert , N. Shafi , I. Shilon , K. Shiningayamwe , R. Simoni , H. Sol , F. Spanier , M. Spir-Jacob , Ł. Stawarz , R. Steenkamp , C. Stegmann , C. Steppa , I. Sushch , T. Takahashi , J. -P. Tavernet , T. Tavernier , A. M. Taylor , R. Terrier , L. Tibaldo , D. Tiziani , M. Tluczykont , C. Trichard , M. Tsirou , N. Tsuji , R. Tuffs , Y. Uchiyama , D. J. van der Walt , C. van Eldik , C. van Rensburg , B. van Soelen , G. Vasileiadis , J. Veh , C. Venter , A. Viana , P. Vincent , J. Vink , F. Voisin , H. J. Völk , T. Vuillaume , Z. Wadiasingh , S. J. Wagner , P. Wagner , R. M. Wagner , R. White , A. Wierzcholska , P. Willmann , A. Wörnlein , D. Wouters , R. Yang , D. Zaborov , M. Zacharias , R. Zanin , A. A. Zdziarski , A. Zech , F. Zefi , A. Ziegler , J. Zorn , N. Żywucka

2D End-to-End Modeling of Kilonovae from Binary Neutron Star Merger Remnants

We investigate the kilonova emission resulting from outflows produced in a three-dimensional (3D) general-relativistic magnetohydrodynamic (GRMHD) simulation of a hypermassive neutron star (HMNS) remnant. We map the outflows into the FLASH…

High Energy Astrophysical Phenomena · Physics 2025-11-18 Lieke Sippens Groenewegen , Sanjana Curtis , Philipp Mösta , Daniel Kasen , Daniel Brethauer

Detectability of kilonovae in optical surveys: $post$-$mortem$ examination of the LVC O3 run follow-up

The detection of the binary neutron star merger GW170817 and the associated electromagnetic (EM) counterpart, the "kilonova" (kN) AT2017gfo, opened a new era in multi-messenger astronomy. However, despite many efforts, it has been proven…

High Energy Astrophysical Phenomena · Physics 2021-05-26 A. Sagués Carracedo , M. Bulla , U. Feindt , A. Goobar

The Diversity of Kilonova Emission in Short Gamma-Ray Bursts

The historic first joint detection of both gravitational wave and electromagnetic emission from a binary neutron star merger cemented the association between short gamma-ray bursts (SGRBs) and compact object mergers, as well as providing a…

High Energy Astrophysical Phenomena · Physics 2018-06-27 B. P. Gompertz , A. J. Levan , N. R. Tanvir , J. Hjorth , S. Covino , P. A. Evans , A. S. Fruchter , C. Gonzalez-Fernandez , Z. Jin , J. D. Lyman , S. R. Oates , P. T. O'Brien , K. Wiersema

Finding the remnants of the Milky Way's last neutron star mergers

The discovery of a binary neutron star merger (NSM) through both its gravitational wave and electromagnetic emission has revealed these events to be key sites of r-process nucleosynthesis. Here, we evaluate the prospects of finding the…

High Energy Astrophysical Phenomena · Physics 2019-07-23 Meng-Ru Wu , Projjwal Banerjee , Brian D. Metzger , Gabriel Martínez-Pinedo , Tsuguo Aramaki , Eric Burns , Charles J. Hailey , Jennifer Barnes , Georgia Karagiorgi

The Radio Luminosity-Risetime Function of Core-Collapse Supernovae

We assemble a large set of 2-10 GHz radio flux density measurements and upper limits of 294 different supernovae (SNe), from the literature and our own and archival data. Only 31% of the SNe were detected. We characterize the SN lightcurves…

High Energy Astrophysical Phenomena · Physics 2021-02-24 Michael F. Bietenholz , N. Bartel , M. Argo , R. Dua , S. Ryder , A. Soderberg

Kilonova constraints for the LIGO/Virgo/KAGRA neutron star merger candidate S250206dm: GW-MMADS observations

Gravitational wave (GW) neutron star mergers with an associated electromagnetic counterpart constitute powerful probes of binary evolution, the production sites of heavy elements, general relativity, and the expansion of the universe. Only…

High Energy Astrophysical Phenomena · Physics 2025-11-04 Lei Hu , Tomás Cabrera , Antonella Palmese , James Freeburn , Mattia Bulla , Igor Andreoni , Xander J. Hall , Brendan O'Connor , Ariel Amsellem , Clécio R. Bom , Malte Busmann , Jennifer Fabà , Julius Gassert , Sena Kalabalik , Keerthi Kunnumkai , Daniel Gruen , Luidhy Santana-Silva , André Santos , Tomás Ahumada , Jonathan Carney , Michael W. Coughlin , Xingzhuo Chen , K. E. Saavik Ford , Daniel E. Holz , Mansi M. Kasliwal , Ignacio Magaña Hernandez , Cassidy Mihalenko , Rosalba Perna , Arno Riffeser , Christoph Ries , Lena Schnappinger , Michael Schmidt , Julian Sommer , Sarah Teague , Pablo Vega , Olga Volchansky , Lifan Wang , Yajie Zhang

Needle in a Bayes Stack: a Hierarchical Bayesian Method for Constraining the Neutron Star Equation of State with an Ensemble of Binary Neutron Star Post-merger Remnants

Binary neutron star (BNS) post-merger gravitational-wave emission can occur in the aftermath of a BNS merger -- provided the system avoids prompt collapse to a black hole -- as a quasistable hypermassive remnant experiences quadrupolar…

High Energy Astrophysical Phenomena · Physics 2023-03-10 Alexander W. Criswell , Jesse Miller , Noah Woldemariam , Theodoros Soultanis , Andreas Bauswein , Katerina Chatziioannou , Michael W. Coughlin , Galin Jones , Vuk Mandic