первоапрельские тезисы

В Архиве традиционно 1 апреля появляются соответствующие статьи.
Супервыдающегося давненько не было, тем не менее.....



arXiv:2003.13879 [pdf, other]
Making It Rain: How Giving Me Telescope Time Can Reduce Drought
Michael B. Lund
Comments: 8 pages, 3 figures, 3 tables. Submitted to Acta Prima Aprilia
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Popular Physics (physics.pop-ph)

In this paper we assess the correlation between recent observing runs (2018 and 2019) and inclement weather, and demonstrate that these observing runs have seen much more rainfall than would otherwise be expected, an increase of over 200%. We further look at a number of observatory sites in areas that are facing or will face drought, and suggest that a strong environmental benefit would follow from telescope allocation committees providing us an inordinate amount of telescope time at facilities located around the globe.

arXiv:2003.13722 [pdf, other]
Defining the Really Habitable Zone
Marven F. Pedbost, Trillean Pomalgu, Chris Lintott, Nora Eisner, Belinda Nicholson
Comments: Presented without comments
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Instrumentation and Methods for Astrophysics (astro-ph.IM)

Since the discovery of the first confirmed exoplanet, observations have revealed a remarkable diversity of worlds. A wide variety of orbital and physical characteristics are detected in the exoplanet population, and much work has been devoted to deciding which of these planets may be suitable for life. Until now, though, little work has been devoted to deciding which of the potentially habitable planets might actually be \textit{worth} existing on. To this end, we present the Really Habitable Zone (RHZ), defined as the region around a star where acceptable gins and tonic are likely to be abundant. In common with much of the work in the field, we rely throughout on assumptions which are difficult if not impossible to test and present some plots which astronomers can use in their own talks, stripped of all caveats. We suggest that planets in the Really Habitable Zone be early targets for the JWST, because by the time that thing finally launches we're all going to need a drink.


arXiv:2003.14131 [pdf, other]
Enceladus Farm: Can plants grow with Enceladus' water? (Preliminary Report)
Daigo Shoji
Comments: 12 pages, 7 figures, Preliminary results. Comments are welcome
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)

Enceladus is a saturnian satellite that should have liquid water inside of it (subsurface ocean). Measurements and experiments on water plume from Enceladus have revealed that Enceladus' ocean contains several salts such as NaCl. On the Earth, salt in soil has become a serious problem for agriculture, and importance of salt-tolerant plants are indicated. In order to test the effect of Enceladus' water to terrestrial plant, by hydroponic, we tried to grow three salt-tolerant plants (ice plant, swiss chard and salicornia) simulating Enceladus' water (Enceladus Farm project). Using water with 0.33% NaCl and 0.4% NaHCO3, which is consistent with the observations of Enceladus, all plants could grow if they were germinated and grown with pure water until each plant had a few leaves. However, growth rate can be suppressed compared with the plants cultivated with pure water. Because our first test was performed with loose conditions, more works are needed to evaluate the effect of Enceladus' water to plant growth. However, in addition to the works to grow plants on lunar and martian grounds, Enceladus' water may be used to consider properties of plant from wider environment.



arXiv:2003.14345 [pdf, other]
Searching for Space Vampires with TEvSS
Maximilian N. Günther, David A. Berardo
Comments: 3 pages, 2 figures, 0 tables, submitted to Journal of Space Vampire Research
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)

It is a truth universally acknowledged, that a single human in possession of a good space telescope, must be in search of a space vampire. Here, we showcase our search for transit signatures of tidally locked space vampires, trapped in the gravitational pull of late M-dwarfs. We generate forward models representing two potential space vampire populations - those in bat shape and those in humanoid shape. We search lightcurves from the Transiting Exo-Vampire Survey Satellite (TEvSS) using a template matching algorithm and fit them using our allesfitter software. Adding the information gained from TEvSS data, we greatly decrease the uncertainty for the existence and occurrence rates of space vampires, and constrain eta(space vampire) to a range of 0% to 100% (or more). These precise analyses will be crucial for optimizing future observing schedules for space-vampire characterization with the James Webb Space-Vampire Telescope (JWSvT) and the Extremely-Large-Vampire Telescopes (ELvTs).





Но я бы выделил отдельно вот эту статью, советуя прочесть ее всем студентам!

arXiv:2003.14327 [pdf, other]
A PDF PSA, or Never gonna set_xscale again -- guilty feats with logarithms
John C. Forbes
Comments: To be submitted to the Astro-pedantic Journal on April 1, 2020
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Instrumentation and Methods for Astrophysics (astro-ph.IM)

In the course of doing astronomy, one often encounters plots of densities, for example probability densities, flux densities, and mass functions. Quite frequently the ordinate of these diagrams is plotted logarithmically to accommodate a large dynamic range. In this situation, I argue that it is critical to adjust the density appropriately, rather than simply setting the x-scale to `log' in your favorite plotting code. I will demonstrate the basic issue with a pedagogical example, then mention a few common plots where this may arise, and finally some possible exceptions to the rule.


И,наконец, первая статья, напечатанная белым по черному!!!!!
Уже в комментарии автор пишет: "Не печатайте!"
https://arxiv.org/pdf/2003.13918.pdf