International Journal of Astrobiology最新文献_第3页

Planetary geodynamics and age constraints on circumstellar habitable zones around main sequence stars 主序星周围星周宜居带的行星地球动力学和年龄约束

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2023-03-14 DOI: 10.1017/s1473550423000083

Fernando de Sousa Mello, A. Friaça

{"title":"Planetary geodynamics and age constraints on circumstellar habitable zones around main sequence stars","authors":"Fernando de Sousa Mello, A. Friaça","doi":"10.1017/s1473550423000083","DOIUrl":"https://doi.org/10.1017/s1473550423000083","url":null,"abstract":"\u0000 Planetary geodynamics may have an important influence over planetary habitability and the boundaries of the circumstellar habitable zone (CHZ) in space and time. To investigate this we use a minimal parameterized model of the co-evolution of the geosphere and atmosphere of Earth-like planets around F, G, K and M main sequence stars. We found the CHZ for the present Solar System located between 0.92 and 1.09 au for a 1.0 M\u0000 \u0000 $_{oplus }$\u0000 \u0000 \u0000 Earth-like planet, extendible to 1.36 au for a 4.0 M\u0000 \u0000 $_{oplus }$\u0000 \u0000 \u0000 planet. In the literature, the CHZ varies considerably in width and border location, but the outer edges tend to be more spread out than the inner edges, showing a higher difficulty in determining the outer edge. Planetary mass has a considerable effect on planetary geodynamics, with low-mass planets cooling down faster and being less capable of maintaining a rich carbon dioxide atmosphere for several billions of years. Age plays a particularly important role in the width of the CHZ as the CHZ contracts in both directions: from the inner edge (as stellar luminosity increases with time), and from the outer edge (as planetary heat flux and seafloor spreading rate decrease with time). This strongly affects long-lived habitability as the 5 Gyr continuous CHZ may be very narrow or even non-existent for low-mass planets (<0.5 M\u0000 \u0000 $_{oplus }$\u0000 \u0000 \u0000 ) and fast-evolving high-mass stars (>1.1 M\u0000 \u0000 $_{odot }$\u0000 \u0000 \u0000 ). Because of this, the mean age of habitable terrestrial planets in our Galaxy today may be younger than Earth's age. Our results suggest that the best targets for future surveys of biosphere signatures may be planets between 0.5 and 4.0 M\u0000 \u0000 $_{oplus }$\u0000 \u0000 \u0000 , in systems younger than the Solar System. These planets may present the widest and long-lived CHZ.","PeriodicalId":13879,"journal":{"name":"International Journal of Astrobiology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46114235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of Telerobot Personalization for Children: Exploring Qualitative Coding of Artwork. 儿童远程机器人个性化研究：探索艺术作品的定性编码。

IF 5.1 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2023-03-01 Epub Date: 2023-03-13 DOI: 10.1145/3568294.3580142

Veronica Ahumada-Newhart, Taffeta S Wood, Erin R Taylor, Francesca O Johnson, Siena Saltzen, Sanjay S Joshi

{"title":"Study of Telerobot Personalization for Children: Exploring Qualitative Coding of Artwork.","authors":"Veronica Ahumada-Newhart, Taffeta S Wood, Erin R Taylor, Francesca O Johnson, Siena Saltzen, Sanjay S Joshi","doi":"10.1145/3568294.3580142","DOIUrl":"10.1145/3568294.3580142","url":null,"abstract":"<p><p>Social telepresence robots (i.e., telerobots) are used for social and learning experiences by children. However, most (if not all) commercially available telerobot bodies were designed for adults in corporate or healthcare settings. Due to an adult-focused market, telerobot design has typically not considered important factors such as age and physical aspect in the design of robot bodies. To better understand how peer interactants can facilitate the identities of remote children through personalization of robot bodies, we conducted an exploratory study to evaluate collaborative robot personalization. In this study, child participants (N=28) attended an interactive lesson on robots in our society. After the lesson, participants interacted with two telerobots for personalization activities and a robot fashion show. Finally, participants completed an artwork activity on robot design. Initial findings from this study will inform our continued work on telepresence robots for virtual inclusion and improved educational experiences of remote children and their peers.</p>","PeriodicalId":13879,"journal":{"name":"International Journal of Astrobiology","volume":"20 1","pages":"536-539"},"PeriodicalIF":5.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11103963/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75018020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Feminism and gender in thinking about extraterrestrial intelligence 思考外星智慧的女权主义和性别

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2023-02-24 DOI: 10.1017/s1473550423000034

K. Szocik, Rakhat Abylkasymova

引用次数: 0

Heat-induced changes in molecular biosignatures and the influence of Mars-relevant minerals 热诱导的分子生物特征变化和火星相关矿物的影响

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2023-02-20 DOI: 10.1017/s1473550423000022

B. Haezeleer, S. Fox, H. Strasdeit

{"title":"Heat-induced changes in molecular biosignatures and the influence of Mars-relevant minerals","authors":"B. Haezeleer, S. Fox, H. Strasdeit","doi":"10.1017/s1473550423000022","DOIUrl":"https://doi.org/10.1017/s1473550423000022","url":null,"abstract":"\u0000 The search for signs of life is a major objective in the exploration of Mars. Of particular interest are chemical biosignatures such as biomolecules. However, molecular biosignatures are susceptible to extreme environmental conditions such as heat, ionising radiation and strong oxidants. Therefore, a knowledge of the stability of possible biosignature molecules under present and past conditions on Mars is important, as well as the nature of possible alteration products. In the light of the long volcanically active history of Mars, we have studied the thermal behaviour of selected biological compounds, namely, haemin (an iron porphyrin closely related to the haem prosthetic group), cytochrome c (a small protein) and lecithin (a mixture of phospholipids). Samples were exposed to temperatures up to 900°C under an inert atmosphere of nitrogen, either in neat form or in mineral matrices. The matrix materials used were sodium chloride, gypsum (CaSO4 ⋅ 2H2O), Ca-montmorillonite (STx-1b), the Martian regolith simulant JSC Mars-1A and some mixtures thereof. Key results are: (1) The onset of significant decomposition for haemin, cytochrome c and lecithin occurs around 240°C. At slightly higher temperatures the disappearance of all characteristic infrared spectral bands indicates complete decomposition and loss of the primary biosignatures. (2) Haemin stoichiometrically releases CO2 and HCl during the initial thermal decomposition phase, at the end of which the iron porphyrin core is still intact. High-temperature products of haemin include graphite, α-iron and cementite (Fe3C). (3) Neat lecithin forms long-chain polyphosphates at 500°C, whereas lecithin‒NaCl mixtures form diphosphate (pyrophosphate). As these anions are absent and rare, respectively, in minerals, they may potentially serve as secondary biosignatures. (4) Heating a mixture of NaCl and JSC Mars-1A at 800°C in the presence of lecithin produces the aluminosilicate mineral sodalite (Na8[AlSiO4]6Cl2), which however appears to be of limited use as a secondary biosignature.","PeriodicalId":13879,"journal":{"name":"International Journal of Astrobiology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45004542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Presence of liquid water during the evolution of exomoons orbiting ejected free-floating planets 围绕喷出的自由漂浮行星运行的外卫星演化过程中液态水的存在

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2023-02-09 DOI: 10.1017/S1473550423000046

Giulia Roccetti, T. Grassi, B. Ercolano, K. Molaverdikhani, A. Crida, D. Braun, A. Chiavassa

{"title":"Presence of liquid water during the evolution of exomoons orbiting ejected free-floating planets","authors":"Giulia Roccetti, T. Grassi, B. Ercolano, K. Molaverdikhani, A. Crida, D. Braun, A. Chiavassa","doi":"10.1017/S1473550423000046","DOIUrl":"https://doi.org/10.1017/S1473550423000046","url":null,"abstract":"\u0000 Free-floating planets (FFPs) can result from dynamical scattering processes happening in the first few million years of a planetary system's life. Several models predict the possibility, for these isolated planetary-mass objects, to retain exomoons after their ejection. The tidal heating mechanism and the presence of an atmosphere with a relatively high optical thickness may support the formation and maintenance of oceans of liquid water on the surface of these satellites. In order to study the timescales over which liquid water can be maintained, we perform dynamical simulations of the ejection process and infer the resulting statistics of the population of surviving exomoons around FFPs. The subsequent tidal evolution of the moons’ orbital parameters is a pivotal step to determine when the orbits will circularize, with a consequential decay of the tidal heating. We find that close-in (\u0000 \u0000 $a lesssim 25$\u0000 \u0000 \u0000 RJ) Earth-mass moons with carbon dioxide-dominated atmospheres could retain liquid water on their surfaces for long timescales, depending on the mass of the atmospheric envelope and the surface pressure assumed. Massive atmospheres are needed to trap the heat produced by tidal friction that makes these moons habitable. For Earth-like pressure conditions (p0 = 1 bar), satellites could sustain liquid water on their surfaces up to 52 Myr. For higher surface pressures (10 and 100 bar), moons could be habitable up to 276 Myr and 1.6 Gyr, respectively. Close-in satellites experience habitable conditions for long timescales, and during the ejection of the FFP remain bound with the escaping planet, being less affected by the close encounter.","PeriodicalId":13879,"journal":{"name":"International Journal of Astrobiology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49104513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Frontiers of astrobiology and the humanities 天体生物学和人文科学的前沿

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2023-01-31 DOI: 10.1017/s1473550422000453

J. Chela-Flores

引用次数: 0

A philosophical perspective about the origin, evolution and distribution of life in the Universe 关于宇宙中生命的起源、演化和分布的哲学观点

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2023-01-25 DOI: 10.1017/s1473550423000010

B. Nascimento-Dias

引用次数: 0

Particle motion determines the types of bioaerosol particles in the stratosphere 粒子运动决定了平流层中生物气溶胶粒子的类型

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2023-01-09 DOI: 10.1017/s1473550422000441

K. Miki

引用次数: 1

Alien technology, conjunction and ergodicity 外星技术，连接和遍历性

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2022-12-15 DOI: 10.1017/s147355042200043x

M. Ćirković

引用次数: 1

On the first probe to transit between two interstellar civilizations 在第一个穿越两个星际文明的探测器上

IF 1.7 4区物理与天体物理

International Journal of Astrobiology Pub Date : 2022-12-06 DOI: 10.1017/s1473550422000428

Graeme H. Smith

{"title":"On the first probe to transit between two interstellar civilizations","authors":"Graeme H. Smith","doi":"10.1017/s1473550422000428","DOIUrl":"https://doi.org/10.1017/s1473550422000428","url":null,"abstract":"\u0000 If a space-faring civilization embarks on a program to send probes to interstellar destinations, the first probe to arrive at such a destination is not likely to be one of the earliest probes, but one of much more advanced capability. This conclusion is based on a scenario in which an extraterrestrial civilization (ETC) embarks upon an interstellar program during which it launches increasingly sophisticated probes whose departure speed increases as a function of time throughout the program. Two back-of-the-envelope models are considered: one in which the launch velocity of an outgoing vehicle increases linearly with the time of launch, and a second in which the increase is exponential with launch date. In this paper consideration is directed to an hypothesized probe arriving within the Solar System from a non-terrestrial civilization. Within the above scenarios, a first-encounter probe will be one that was launched well after the initiation of an interstellar program by an ETC. Consequently, such a probe would be the product of a relatively advanced phase of that ETC's technology. The more distant the site from which an ETC is launching probes, the greater will be the technology gap between a first-encounter probe and terrestrial technology. One possible ramification may pertain to interpreting the nature of Unidentified Aerial Phenomena (UAP). Are flight characteristics of any UAP singular enough as to be consistent with an origin from a distant ETC?","PeriodicalId":13879,"journal":{"name":"International Journal of Astrobiology","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45900010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0