On the Image Profiles of Transients in the Palomar Sky Survey
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911069113417728 |
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| author | Villarroel, Beatriz Solano, Enrique Marcy, Geoffrey W. |
| author_facet | Villarroel, Beatriz Solano, Enrique Marcy, Geoffrey W. |
| contents | The VASCO project has discovered groups of short-lived transients on historical photographic plates that lack conventional explanation. Hambly & Blair (2024) examined nine such transients reported by Villarroel (2021) and found that they exhibit narrower, rounder profiles, attributing this to emulsion flaws. However, well-established optical principles and atmospheric physics imply that unresolved flashes lasting less than a second naturally appear sharper and more circular than stellar images, particularly on long-exposure plates where stars are significantly blurred by seeing and tracking errors. Such profiles are an expected consequence of sub-second optical flashes, making their findings consistent with the transient interpretation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_15896 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On the Image Profiles of Transients in the Palomar Sky Survey Villarroel, Beatriz Solano, Enrique Marcy, Geoffrey W. Solar and Stellar Astrophysics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics The VASCO project has discovered groups of short-lived transients on historical photographic plates that lack conventional explanation. Hambly & Blair (2024) examined nine such transients reported by Villarroel (2021) and found that they exhibit narrower, rounder profiles, attributing this to emulsion flaws. However, well-established optical principles and atmospheric physics imply that unresolved flashes lasting less than a second naturally appear sharper and more circular than stellar images, particularly on long-exposure plates where stars are significantly blurred by seeing and tracking errors. Such profiles are an expected consequence of sub-second optical flashes, making their findings consistent with the transient interpretation. |
| title | On the Image Profiles of Transients in the Palomar Sky Survey |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2507.15896 |