Exploring nine simultaneously occurring transients on April 12th 1950

Abstract Nine point sources appeared within half an hour on a region within $$\sim $$ ∼ 10 arcmin of a red-sensitive photographic plate taken in April 1950 as part of the historic Palomar Sky Survey. All nine sources are absent on both previous and later photographic images, and absent in modern sur...

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Autores principales:	Beatriz Villarroel, Geoffrey W. Marcy, Stefan Geier, Alina Streblyanska, Enrique Solano, Vitaly N. Andruk, Matthew E. Shultz, Alok C. Gupta, Lars Mattsson
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3e494acb37db4e5fa5fca631ce66b700
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spelling	oai:doaj.org-article:3e494acb37db4e5fa5fca631ce66b7002021-12-02T16:04:27ZExploring nine simultaneously occurring transients on April 12th 195010.1038/s41598-021-92162-72045-2322https://doaj.org/article/3e494acb37db4e5fa5fca631ce66b7002021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92162-7https://doaj.org/toc/2045-2322Abstract Nine point sources appeared within half an hour on a region within $$\sim $$ ∼ 10 arcmin of a red-sensitive photographic plate taken in April 1950 as part of the historic Palomar Sky Survey. All nine sources are absent on both previous and later photographic images, and absent in modern surveys with CCD detectors which go several magnitudes deeper. We present deep CCD images with the 10.4-m Gran Telescopio Canarias, reaching brightness $$r \sim 26$$ r ∼ 26 mag, that reveal possible optical counterparts, although these counterparts could equally well be just chance projections. The incidence of transients in the investigated photographic plate is far higher than expected from known detection rates of optical counterparts to e.g. flaring dwarf stars, Fast Radio Bursts, Gamma Ray Bursts or microlensing events. One possible explanation is that the plates have been subjected to an unknown type of contamination producing mainly point sources with of varying intensities along with some mechanism of concentration within a radius of $$\sim $$ ∼ 10 arcmin on the plate. If contamination as an explanation can be fully excluded, another possibility is fast (t $$<0.5$$ < 0.5 s) solar reflections from objects near geosynchronous orbits. An alternative route to confirm the latter scenario is by looking for images from the First Palomar Sky Survey where multiple transients follow a line.Beatriz VillarroelGeoffrey W. MarcyStefan GeierAlina StreblyanskaEnrique SolanoVitaly N. AndrukMatthew E. ShultzAlok C. GuptaLars MattssonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Beatriz Villarroel Geoffrey W. Marcy Stefan Geier Alina Streblyanska Enrique Solano Vitaly N. Andruk Matthew E. Shultz Alok C. Gupta Lars Mattsson Exploring nine simultaneously occurring transients on April 12th 1950
description	Abstract Nine point sources appeared within half an hour on a region within $$\sim $$ ∼ 10 arcmin of a red-sensitive photographic plate taken in April 1950 as part of the historic Palomar Sky Survey. All nine sources are absent on both previous and later photographic images, and absent in modern surveys with CCD detectors which go several magnitudes deeper. We present deep CCD images with the 10.4-m Gran Telescopio Canarias, reaching brightness $$r \sim 26$$ r ∼ 26 mag, that reveal possible optical counterparts, although these counterparts could equally well be just chance projections. The incidence of transients in the investigated photographic plate is far higher than expected from known detection rates of optical counterparts to e.g. flaring dwarf stars, Fast Radio Bursts, Gamma Ray Bursts or microlensing events. One possible explanation is that the plates have been subjected to an unknown type of contamination producing mainly point sources with of varying intensities along with some mechanism of concentration within a radius of $$\sim $$ ∼ 10 arcmin on the plate. If contamination as an explanation can be fully excluded, another possibility is fast (t $$<0.5$$ < 0.5 s) solar reflections from objects near geosynchronous orbits. An alternative route to confirm the latter scenario is by looking for images from the First Palomar Sky Survey where multiple transients follow a line.
format	article
author	Beatriz Villarroel Geoffrey W. Marcy Stefan Geier Alina Streblyanska Enrique Solano Vitaly N. Andruk Matthew E. Shultz Alok C. Gupta Lars Mattsson
author_facet	Beatriz Villarroel Geoffrey W. Marcy Stefan Geier Alina Streblyanska Enrique Solano Vitaly N. Andruk Matthew E. Shultz Alok C. Gupta Lars Mattsson
author_sort	Beatriz Villarroel
title	Exploring nine simultaneously occurring transients on April 12th 1950
title_short	Exploring nine simultaneously occurring transients on April 12th 1950
title_full	Exploring nine simultaneously occurring transients on April 12th 1950
title_fullStr	Exploring nine simultaneously occurring transients on April 12th 1950
title_full_unstemmed	Exploring nine simultaneously occurring transients on April 12th 1950
title_sort	exploring nine simultaneously occurring transients on april 12th 1950
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3e494acb37db4e5fa5fca631ce66b700
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Exploring nine simultaneously occurring transients on April 12th 1950

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