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Search for transient optical counterparts to high-energy IceCube neutrinos with Pan-STARRS1
Queens Univ Belfast, Astrophys Res Ctr, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland;Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku 20014, Finland.
Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany.
Queens Univ Belfast, Astrophys Res Ctr, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland.
Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA.
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2019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 626, article id A117Article in journal (Refereed) Published
Abstract [en]

In order to identify the sources of the observed diffuse high-energy neutrino flux, it is crucial to discover their electromagnetic counterparts. To increase the sensitivity of detecting counterparts of transient or variable sources by telescopes with a limited field of view, IceCube began releasing alerts for single high-energy (E-v > 60 TeV) neutrino detections with sky localisation regions of order 1 degrees radius in 2016. We used Pan-STARRS1 to follow-up five of these alerts during 2016-2017 to search for any optical transients that may be related to the neutrinos. Typically 10-20 faint m(ip1) less than or similar to 22.5 mag) extragalactic transients are found within the Pan-STARRS1 footprints and are generally consistent with being unrelated field supernovae (SNe) and AGN. We looked for unusual properties of the detected transients, such as temporal coincidence of explosion epoch with the IceCube timestamp, or other peculiar light curve and physical properties. We found only one transient that had properties worthy of a specific follow-up. In the Pan-STARRS1 imaging for IceCube-160427A (probability to be of astrophysical origin of similar to 50%), we found a SN PS16cgx, located at 10.0' from the nominal IceCube direction. Spectroscopic observations of PS16cgx showed that it was an H-poor SN at redshift z = 0.2895 +/- 0.0001. The spectra and light curve resemble some high-energy Type Ic SNe, raising the possibility of a jet driven SN with an explosion epoch temporally coincident with the neutrino detection. However, distinguishing Type Ia and Type Ic SNe at this redshift is notoriously difficult. Based on all available data we conclude that the transient is more likely to be a Type Ia with relatively weak Sin absorption and a fairly normal rest-frame r-band light curve. If, as predicted, there is no high-energy neutrino emission from Type Ia SNe, then PS16cgx must be a random coincidence, and unrelated to the IceCube-160427A. We find no other plausible optical transient for any of the five IceCube events observed down to a 5 sigma limiting magnitude of mip1 approximate to 22 mag, between 1 day and 25 days after detection.

Place, publisher, year, edition, pages
EDP Sciences, 2019. Vol. 626, article id A117
Keywords [en]
astroparticle physics, neutrinos, supernovae: general
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-390674DOI: 10.1051/0004-6361/201935171ISI: 000472594000001OAI: oai:DiVA.org:uu-390674DiVA, id: diva2:1343121
Funder
German Research Foundation (DFG)Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)Knut and Alice Wallenberg FoundationEU, European Research Council, 291222Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-15Bibliographically approved

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Botner, OlgaBurgman, AlexanderHallgren, AllanPérez de los Heros, CarlosUnger, Elisabeth

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