منابع مشابه
Terrestrial effects of moderately nearby supernovae
Recent data indicate one or more moderately nearby supernovae in the early Pleistocene, with additional events likely in the Miocene. This has motivated more detailed computations, using new information about the nature of supernovae and the distances of these events to describe in more detail the sorts of effects that are indicated at the Earth. This short communication/review is designed to d...
متن کاملTerrestrial Effects Of Nearby Supernovae In The Early Pleistocene
Recent results have strongly confirmed that multiple supernovae happened at distances ~100 pc consisting of two main events: one at 1.7 to 3.2 million years ago, and the other at 6.5 to 8.7 million years ago. These events are said to be responsible for excavating the Local Bubble in the interstellar medium and depositing Fe on Earth and the Moon. Other events are indicated by effects in the loc...
متن کاملModerately luminous type II Supernovae ?
Context. Core-collapse Supernovae (CC-SNe) descend from progenitors more massive than about 8 M . Because of the young age of the progenitors, the ejecta may eventually interact with the circumstellar medium (CSM) via highly energetic processes detectable in the radio, X–ray, ultraviolet (UV) and, sometimes, in the optical domains. Aims. In this paper we present ultraviolet, optical and near in...
متن کاملOzone Depletion from Nearby Supernovae
Estimates made in the 1970’s indicated that a supernova occurring within tens of parsecs of Earth could have significant effects on the ozone layer. Since that time improved tools for detailed modeling of atmospheric chemistry have been developed to calculate ozone depletion, and advances have been made also in theoretical modeling of supernovae and of the resultant gamma-ray spectra. In additi...
متن کاملThe Risetime of Nearby Type Ia Supernovae
We present calibrated photometric measurements of the earliest detections of nearby type Ia supernovae (SNe Ia). The set of ∼30 new, unfiltered CCD observations delineate the early rise behavior of SNe Ia > 18 to 10 days before maximum. Using simple empirical models, we demonstrate the strong correlation between the risetime (i.e., the time between explosion and maximum), the post-rise light-cu...
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ژورنال
عنوان ژورنال: Lethaia
سال: 2018
ISSN: 0024-1164
DOI: 10.1111/let.12256