Parallaxes of southern extremely cool objects III : 118 L and T dwarfs

We present new results from the Parallaxes of Southern Extremely Cool dwarfs program to measure parallaxes, proper motions and multiepoch photometry of L and early T dwarfs. The observations were made on 108 nights over the course of 8 yr using the Wide Field Imager on the ESO 2.2m telescope. We present 118 new parallaxes of L and T dwarfs of which 52 have no published values and 24 of the 66 published values are preliminary estimates from this program. The parallax precision varies from 1.0 to 15.5mas with a median of 3.8mas. We find evidence for two objects with long term photometric variation and 24 new moving group candidates. We cross-match our sample to published photometric catalogues and find standard magnitudes in up to 16 pass-bands from which we build spectral energy distributions and H-R diagrams. This allows us to confirm the theoretically anticipated minimum in radius between stars and brown dwarfs across the hydrogen burning minimum mass. We find the minimum occurs between L2 and L6 and verify the predicted steep dependence of radius in the hydrogen burning regime and the gentle rise into the degenerate brown dwarf regime. We find a relatively young age of ~2 Gyr from the kinematics of our sample.Peer reviewedFinal Accepted Versio

PÓS-VERDADE, ESCRITA E CRÍTICA DAS PRÁTICAS JORNALÍSTICAS

Iniciamos o quarto ano editorial da Revista Observatório com diversas mudanças. A primeira e mais visível é a adoção de capas artísticas que passam a ser vistas também como peças criativas, com autoria. No primeiro número de 2018, temos a belíssima foto de Marli Wunder, fotógrafa do Coletivo Fabulografia (Unicam) que passa a estampar o centro da revista; a segunda e importantíssima, a revista ciente de seu papel como parte importante do processo de divulgação científica, visando garantir a máxima publicização em acesso aberto dos artigos publicados, assume como pilares de seu trabalho a partir de 2018: • Para Metadados bibliográficos: disponibilização de DOI (Digital Object Identifier), ORCIDs (Open Researcher and Contributor ID), a data de publicação e o título. • Inclusão de Metadados semânticos: disponibilização não apenas dos metadados simples (informação sobre um artigo). A revista se preocupa com o enriquecimento semântico,  criando camadas de informação, por meio dos resumos, palavras-chave, infografias e releases jornalísticos de divulgação. Estes metadados “enriquecidos” retornam buscas mais precisas e potencializam os artigos publicados. • Foco na Granularidade: a informação presente dentro do artigo é potencializada (infografias e releases jornalísticos de divulgação). Essa mudança inicia com os números de 2018, mas já está também em produção para os demais números de 2015-2017. Nos próximos meses o enriquecimento semântico e a granularidade alcançarão todos os artigos publicados pela Revista Observatório

In-depth study of moderately young but extremely red, very dusty substellar companion HD206893B

Accepted for publication in Astronomy & Astrophysics. Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO.The substellar companion HD206893b has recently been discovered by direct imaging of its disc-bearing host star with the SPHERE instrument. We investigate the atypical properties of the companion, which has the reddest near-infrared colours among all known substellar objects, either orbiting a star or isolated, and we provide a comprehensive characterisation of the host star-disc-companion system. We conducted a follow-up of the companion with adaptive optics imaging and spectro-imaging with SPHERE, and a multiinstrument follow-up of its host star. We obtain a R=30 spectrum from 0.95 to 1.64 micron of the companion and additional photometry at 2.11 and 2.25 micron. We carried out extensive atmosphere model fitting for the companions and the host star in order to derive their age, mass, and metallicity. We found no additional companion in the system in spite of exquisite observing conditions resulting in sensitivity to 6MJup (2MJup) at 0.5" for an age of 300 Myr (50 Myr). We detect orbital motion over more than one year and characterise the possible Keplerian orbits. We constrain the age of the system to a minimum of 50 Myr and a maximum of 700 Myr, and determine that the host-star metallicity is nearly solar. The comparison of the companion spectrum and photometry to model atmospheres indicates that the companion is an extremely dusty late L dwarf, with an intermediate gravity (log g 4.5-5.0) which is compatible with the independent age estimate of the system. Though our best fit corresponds to a brown dwarf of 15-30 MJup aged 100-300 Myr, our analysis is also compatible with a range of masses and ages going from a 50 Myr 12MJup planetary-mass object to a 50 MJup Hyades-age brown dwarf...Peer reviewedFinal Accepted Versio

Metabolic profile and body condition score of Crioulo horses finalists in the Freio de Ouro competition

The aim of this study was to assess the body condition score (BCS) and metabolic profile of finalists in the Freio de Ouro competition, stratified by sex. This study examined 84 Crioulo horses, comprising 43 non-pregnant mares and 41 stallions. Morphometric measurements, including BCS, cresty neck score (CNS), neck and heart girth, and assessments of fat depth at the neck and at the tail base, were conducted. Additional derived measurements such as the percentage of body fat (%BF), body mass index (BMI), fat mass (FM), fat-free mass (FFM), heart girth:height ratio (HG:HW), and neck circumference:height ratio (NC:HW) were calculated. A subgroup of 53 animals was selected for the evaluation of metabolic parameters, including triglycerides, cholesterol, low-density lipoprotein (LDL), high-density lipoprotein (HDL), lactate dehydrogenase (LDH), creatine kinase (CK), and adiponectin.In terms of BCS, 21% of participants were classified as overweight, with 49% having CNS≥3. Females exhibited greater fat deposition at the tail base and neck, along with higher %BF, FM, and HG:HW ratio, and lower NC:HWcompared to males. Among metabolic variables, females showed higher concentrations of LDH, LDL, CK, and lower concentrations of adiponectin than males. No differences were observed in morphometric measurements between participants that qualified for the final day of the competition and those which were disqualified. The study revealed that despite the rigorous physical demands and preparation required for the Freio de Ouro competition, a percentage of participants were overweight, displaying increased regional fat deposition in the neck. Although no metabolic changes related to increased adiposity were identified, the findings indicate a predisposition to the development of metabolic alterations. Additionally, females exhibited a greater accumulation of fat than males

Murmúrios de Aion. Tempo e Jornalismo

The purpose of this article is to approach Journalism and its practices and epistemic constitution considering two secular natures: the time of Cronos and the time of Aion. In the time of Cronos, practices present in the journalistic mode of selection, edition, cut, readability and circulation focus on the journalism itself considering characteristics such as measure, identity, locality and successively. In the time of Aion, the external and virtual forces constitute journalism in their differences as well as their ‘devires’. Aiming at the future of journalism as creation, this second modality of time presents characteristics like the immoderate, the lack of identity, the concomitance and the displaced.Este artigo aborda as práticas e a constituição do jornalístico considerando duas naturezas temporais, respectivamente: o tempo de Cronos e o tempo de Aion. No tempo de Cronos, as práticas presentes nos modos de seleção, edição, corte, textualização e circulação apontam para o propriamente jornalístico, considerando características como medida, identidade, localidade e sucessividade. No tempo de Aion, avaliam-se as forças do fora que, virtuais, constituem não apenas os jornalismos existentes, mas também seus devires. Voltado para o futuro do jornalismo como criação, são consideradas nesta segunda modalidade de tempo características como o desmedido, a singularidade não identitária, a concomitância e o atópico

Murmúrios de Aion. Tempo e Jornalismo

The purpose of this article is to approach Journalism and its practices and epistemic constitution considering two secular natures: the time of Cronos and the time of Aion. In the time of Cronos, practices present in the journalistic mode of selection, edition, cut, readability and circulation focus on the journalism itself considering characteristics such as measure, identity, locality and successively. In the time of Aion, the external and virtual forces constitute journalism in their differences as well as their ‘devires’. Aiming at the future of journalism as creation, this second modality of time presents characteristics like the immoderate, the lack of identity, the concomitance and the displaced.Este artigo aborda as práticas e a constituição do jornalístico considerando duas naturezas temporais, respectivamente: o tempo de Cronos e o tempo de Aion. No tempo de Cronos, as práticas presentes nos modos de seleção, edição, corte, textualização e circulação apontam para o propriamente jornalístico, considerando características como medida, identidade, localidade e sucessividade. No tempo de Aion, avaliam-se as forças do fora que, virtuais, constituem não apenas os jornalismos existentes, mas também seus devires. Voltado para o futuro do jornalismo como criação, são consideradas nesta segunda modalidade de tempo características como o desmedido, a singularidade não identitária, a concomitância e o atópico

Whispers of Aion. Time and Journalism

Este artigo aborda as práticas e a constituição do jornalístico considerando duas naturezas temporais, respectivamente: o tempo de Cronos e o tempo de Aion. No tempo de Cronos, as práticas presentes nos modos de seleção, edição, corte, textualização e circulação apontam para o propriamente jornalístico, considerando características como medida, identidade, localidade e sucessividade. No tempo de Aion, avaliam-se as forças do fora que, virtuais, constituem não apenas os jornalismos existentes, mas também seus devires. Voltado para o futuro do jornalismo como criação, são consideradas nesta segunda modalidade de tempo características como o desmedido, a singularidade não identitária, a concomitância e o atópico.The purpose of this article is to approach Journalism and its practices and epistemic constitution considering two secular natures: the time of Cronos and the time of Aion. In the time of Cronos, practices present in the journalistic mode of selection, edition, cut, readability and circulation focus on the journalism itself considering characteristics such as measure, identity, locality and successively. In the time of Aion, the external and virtual forces constitute journalism in their differences as well as their ‘devires’. Aiming at the future of journalism as creation, this second modality of time presents characteristics like the immoderate, the lack of identity, the concomitance and the displaced