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dc.contributor.authorMasui, Kiyoshi
dc.date.accessioned2022-04-27T17:18:00Z
dc.date.available2022-04-27T17:18:00Z
dc.date.issued2021
dc.identifier.urihttps://hdl.handle.net/1721.1/142145
dc.description.abstract<jats:title>Abstract</jats:title> <jats:p>The object FRB 20180916B is a well-studied repeating fast radio burst source. Its proximity (∼150 Mpc), along with detailed studies of the bursts, has revealed many clues about its nature, including a 16.3 day periodicity in its activity. Here we report on the detection of 18 bursts using LOFAR at 110–188 MHz, by far the lowest-frequency detections of any FRB to date. Some bursts are seen down to the lowest observed frequency of 110 MHz, suggesting that their spectra extend even lower. These observations provide an order-of-magnitude stronger constraint on the optical depth due to free–free absorption in the source’s local environment. The absence of circular polarization and nearly flat polarization angle curves are consistent with burst properties seen at 300–1700 MHz. Compared with higher frequencies, the larger burst widths (∼40–160 ms at 150 MHz) and lower linear polarization fractions are likely due to scattering. We find ∼2–3 rad m<jats:sup>−2</jats:sup> variations in the Faraday rotation measure that may be correlated with the activity cycle of the source. We compare the LOFAR burst arrival times to those of 38 previously published and 22 newly detected bursts from the uGMRT (200–450 MHz) and CHIME/FRB (400–800 MHz). Simultaneous observations show five CHIME/FRB bursts when no emission is detected by LOFAR. We find that the burst activity is systematically delayed toward lower frequencies by about 3 days from 600 to 150 MHz. We discuss these results in the context of a model in which FRB 20180916B is an interacting binary system featuring a neutron star and high-mass stellar companion.</jats:p>en_US
dc.language.isoen
dc.publisherAmerican Astronomical Societyen_US
dc.relation.isversionof10.3847/2041-8213/ABEC72en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceThe American Astronomical Societyen_US
dc.titleLOFAR Detection of 110–188 MHz Emission and Frequency-dependent Activity from FRB 20180916Ben_US
dc.typeArticleen_US
dc.identifier.citationMasui, Kiyoshi. 2021. "LOFAR Detection of 110–188 MHz Emission and Frequency-dependent Activity from FRB 20180916B." The Astrophysical Journal Letters, 911 (1).
dc.contributor.departmentMIT Kavli Institute for Astrophysics and Space Research
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physics
dc.relation.journalThe Astrophysical Journal Lettersen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2022-04-27T17:15:11Z
dspace.orderedauthorsPleunis, Z; Michilli, D; Bassa, CG; Hessels, JWT; Naidu, A; Andersen, BC; Chawla, P; Fonseca, E; Gopinath, A; Kaspi, VM; Kondratiev, VI; Li, DZ; Bhardwaj, M; Boyle, PJ; Brar, C; Cassanelli, T; Gupta, Y; Josephy, A; Karuppusamy, R; Keimpema, A; Kirsten, F; Leung, C; Marcote, B; Masui, KW; Mckinven, R; Meyers, BW; Ng, C; Nimmo, K; Paragi, Z; Rahman, M; Scholz, P; Shin, K; Smith, KM; Stairs, IH; Tendulkar, SPen_US
dspace.date.submission2022-04-27T17:15:15Z
mit.journal.volume911en_US
mit.journal.issue1en_US
mit.licensePUBLISHER_POLICY
mit.metadata.statusAuthority Work and Publication Information Neededen_US


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