The Influence of Galactic Cosmic Rays on Ion-Neutral Hydrocarbon Chemistry in the Upper Atmospheres of Free-Floating Exoplanets

Cosmic rays may be linked to the formation of volatiles necessary for prebiotic chemistry. We explore the effect of cosmic rays in a hydrogen-dominated atmosphere, as a proof-of-concept that ion-neutral chemistry may be important for modelling hydrogen-dominated atmospheres. In order to accomplish this, we utilize Monte Carlo cosmic ray transport models with particle energies of $10^6$ eV $< E < 10^{12}$ eV in order to investigate the cosmic ray enhancement of free electrons in substellar atmospheres. Ion-neutral chemistry is then applied to a Drift-Phoenix model of a free-floating giant gas planet. Our results suggest that the activation of ion-neutral chemistry in the upper atmosphere significantly enhances formation rates for various species, and we find that C$_2$H$_2$, C$_2$H$_4$, NH$_3$, C$_6$H$_6$ and possibly C$_{10}$H are enhanced in the upper atmospheres because of cosmic rays. Our results suggest a potential connection between cosmic ray chemistry and the hazes observed in the upper atmospheres of various extrasolar planets. Chemi-ionization reactions are briefly discussed, as they may enhance the degree of ionization in the cloud layer.Comment: 22 pages, 4 figures. Accepted to the International Journal of Astrobiolog

Ionization in atmospheres of brown dwarfs and extrasolar planets. IV. The effect of cosmic rays

Cosmic rays provide an important source for free electrons in Earth's atmosphere and also in dense interstellar regions where they produce a prevailing background ionization. We utilize a Monte Carlo cosmic ray transport model for particle energies of 10(6) eV <E <10(9) eV, and an analytic cosmic ray transport model for particle energies of 10(9) eV <E <10(12) eV in order to investigate the cosmic ray enhancement of free electrons in substellar atmospheres of free-floating objects. The cosmic ray calculations are applied to Drift-Phoenix model atmospheres of an example brown dwarf with effective temperature T-eff = 1500 K, and two example giant gas planets (T-eff = 1000 K, 1500 K). For the model brown dwarf atmosphere, the electron fraction is enhanced significantly by cosmic rays when the pressure p(gas) <10(-2) bar. Our example giant gas planet atmosphere suggests that the cosmic ray enhancement extends to 10(-4)-10(-2) bar, depending on the effective temperature. For the model atmosphere of the example giant gas planet considered here (T-eff = 1000 K), cosmic rays bring the degree of ionization to f(e) greater than or similar to 10(-8) when p(gas) <10(-8) bar, suggesting that this part of the atmosphere may behave as a weakly ionized plasma. Although cosmic rays enhance the degree of ionization by over three orders of magnitude in the upper atmosphere, the effect is not likely to be significant enough for sustained coupling of the magnetic field to the gas.Peer reviewe

Small hydrocarbon molecules in cloud-forming Brown Dwarf and giant gas planet atmospheres

We study the abundances of complex carbon-bearing molecules in the oxygen-rich dust- forming atmospheres of Brown Dwarfs and giant gas planets. The inner atmospheric re- gions that form the inner boundary for thermochemical gas-phase models are investigated. Results from Drift-phoenix atmosphere simulations, which include the feedback of phase- non-equilibrium dust cloud formation on the atmospheric structure and the gas-phase abun- dances, are utilised. The resulting element depletion leads to a shift in the carbon-to-oxygen ratio such that several hydrocarbon molecules and cyanopolycyanopolyynene molecules can be present. An increase in surface gravity and/or a decrease in metallicity support the increase in the partial pressures of these species. CO, CO2, CH4, and HCN contain the largest fraction of carbon. In the upper atmosphere of low-metallicity objects, more carbon is contained in C4H than in CO, and also CH3 and C2H2 play an increasingly important role as carbon-sink. We determine chemical relaxation time-scales to evaluate if hydrocarbon molecules can be affected by transport-induced quenching. Our results suggest that a considerable amount of C2H6 and C2H2 could be expected in the upper atmospheres not only of giant gas planets, but also of Brown Dwarfs. However, the exact quenching height strongly depends on the data source used. These results will have an impact on future thermo-kinetic studies, as they change the inner boundary condition for those simulations.Comment: 17 pages, 13 figures, 1 table, accepted to MNRA

Hail to the thief: a tribute to Kazaa

THIS PAPER CONSIDERS THE ONGOING LITIGATION against the peer-to-peer network KaZaA. Record companies and Hollywood studios have faced jurisdictional and legal problems in suing this network for copyright infringement. As Wired Magazine observes: “The servers are in Denmark. The software is in Estonia. The domain is registered Down Under, the corporation on a tiny island in the South Pacific. The users—60 million of them—are everywhere around the world.” In frustration, copyright owners have launched copyright actions against intermediaries—like against Internet Service Providers such as Verizon. They have also embarked on filing suits against individual users of file-sharing programs. In addition, copyright owners have called for domestic- and international-law reform with respect to digital copyright. The Senate Committee on Government Affairs of the United States Congress has reviewed the controversial use of subpoenas in suits against users of file-sharing peer-to-peer networks. The United States has encouraged other countries to adopt provisions of the Digital Millennium Copyright Act 1998 in bilateral and regional free-trade agreements

Orphans' or Veterans? Justice for Children Born of War in East Timor

All over East Timor, one can find “orphans” whose parents still live, and “wives” who have never been married. These labels mask an open secret in Timorese society—hundreds of babies were born of rape during the Indonesian occupation from 1974 to 1999. In juxtaposition, as a result of the 2004 UNFPA-conducted census, there is finally data available on the current population of East Timor and it has unexpectedly revealed a baby boom, perhaps in response to the emotional losses of the occupation. The fertility rate was found to be the highest in the world, at 8.3 babies per woman.1 The baby as the symbol of both wound and healing is clearly at play in Timor at the present time. Nonetheless, there is official silence on the number and treatment of the children born of conflict, a lack of attention in the transitional justice mechanisms in place in Timor in regard to the human rights violations that produced their situation, and no official policies to deal with the needs of these children or their mothers, or the discrimination they may face. The challenge posed by these children and women to the social fabric of Timor reveals important gaps and silences within the international human rights law framework which might nonetheless be addressed by some fairly straightforward policy innovations. In this paper, I argue that status of the mothers socially and legally, as it impacts on the well-being and ability of the children to claim their rights, needs to be more fully addressed in transitional justice debates. Within Timor, there is a definite ambivalence about the idea of these women as contributors to independence during the occupation, and discomfiture regarding their status as so-called “wives” of Indonesian military. This cultural construction is both exacerbated and challenged by the ambivalent influence of Catholic teachings on East Timorese society. Nonetheless, social currents also exist that, if strategically used to reconstruct the image of these children and women, could more effectively reframe their trauma in transitional justice discourse, and contribute both to their well-being and the long-term process of reconciliation in East Timor. The paper proceeds in two sections. First, I first provide an overview of the situation of sexual violence survivors and their children in East Timor. In the second section I discuss current approaches to the children and their mothers within the transitional justice mechanisms available in East Timor at this time. I aim to shift the current approach to children born of war in Timor from covert welfare assistance by the Catholic Church and NGOs, to a rights-based framework, where the affected children are publicly accepted with valid claims on the Government, rather than seen as by-products of a crime or sin. From this analysis it becomes clear that creative policy and legal options are required that would assist these families with integration, status and financial security. I conclude with one such proposal to improve the situation of these families: re-characterise the affected women and their children as “veterans” of the conflict, with the same status as the former Falintil guerrillas.La

Appropriate Economic Space for Transnational Infrastructural Projects: Gateways, Multimodal Corridors, and Special Economic Zones

This study addresses three questions that arise in Asia when formulating, financing, implementing, and maintaining transnational linkages versus purely domestic connections. Firstly, how is optimal economic space to be defined as a useful starting point? Secondly, how can relevant criteria be developed to define the emerging spatial economy and identify efficient transnational transport networks? Thirdly, what are the main investment opportunities in physical infrastructure that would result in more efficient and effective regional cooperation and integration (making special reference to the potential role of cross-border special economic zones (SEZs) or their equivalents)?asia transnational infrastructure; asia regional cooperation

Regional macroeconomic outcomes under alternative arrangements for the financing of urban infrastructure

Many studies, both of Australia and of comparable developed economies, have found that the economic benefits from investment in urban infrastructure are substantial. However the nature of this infrastructure is often such that it is under-provided by the private sector. In Australia, much of the responsibility for the provision of urban infrastructure rests with state and local government. However throughout the 1990’s many of Australia’s state governments embarked on a period of fiscal restraint, seeking to improve financial positions weakened by exposure to failed state government enterprises in the early 1990’s. Perhaps because of the deferred consequences of reducing spending on infrastructure, a large proportion of this fiscal adjustment appears to have been borne by spending on public infrastructure. Today, policy attention at the state government level is again focussing on public infrastructure. However in spite of the now robust fiscal positions of Australia’s state governments, there remains a reluctance on their part to finance public infrastructure through debt, and raising taxes is perceived as politically unpopular. Instead, governments are exploring alternative financing instruments, such as developer charges and public-private partnerships. This paper uses a dynamic multi-regional CGE model (MMRF) to evaluate the regional macro economic consequences of four alternative methods of financing an expansion in state government spending on public infrastructure. The four methods are developer charges, payroll tax, government debt, and residential rates. The paper confirms that the services provided by public infrastructure can have significant impacts on the regional macro economy. More importantly however, the paper demonstrates that the total gains from urban infrastructure are quite sensitive to the means chosen by government to finance infrastructure investment. In contrast to up-front financing methods (such as developer charges, payroll tax, and residential rates), the paper finds that the gains from urban infrastructure are greatest when the chosen financing method provides a closer match between the timing of the burden of financing the infrastructure and the timing of the benefits provided by the infrastructure. This can be achieved by instruments such as debt, public-private partnerships, and user charges. On this basis the paper finds that a greater reliance by regional government son debt financing might be warranted, and that the gains from infrastructure expenditure are least when that expenditure is financed by developer charges.