Browsing by Author "Cáceres, C."

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    Sub-millimetre non-contaminated detection of the disc around TWA 7 by ALMA
    (2019) Beamin Muhlenbrock, Juan Carlos; Bayo, A.; Olofsson, J.; Matrà, L.; Gallardo, J.; de Gregorio-Monsalvo, I.; Booth, M.; Zamora, C.; Iglesias, D.; Henning. Th; Schreiber, M.R.; Cáceres, C.
    Debris discs can be seen as the leftovers of giant planet formation and the possible nurseries of rocky planets. While M-type stars outnumber more massive stars we know very little about the time evolution of their circumstellar discs at ages older than ∼10 Myr. Sub-millimetre observations are best to provide first order estimates of the available mass reservoir and thus better constrain the evolution of such discs. Here, we present ALMA Cycle 3 Band 7 observations of the debris disc around the M2 star TWA 7, which had been postulated to harbour two spatially separated dust belts, based on unresolved far-infrared and sub-millimetre data. We show that most of the emission at wavelengths longer than ∼300 μm is in fact arising from a contaminant source, most likely a sub-mm galaxy, located at about 6.6 arcsec east of TWA 7 (in 2016). Fortunately, the high resolution of our ALMA data allows us to disentangle the contaminant emission from that of the disc and report a significant detection of the disc in the sub-millimetre for the first time with a flux density of 2.1 ± 0.4 mJy at 870 um. With this detection, we show that the spectral energy distribution can be reproduced with a single dust belt.
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    The 5 ' Untranslated Region of the Human T-Cell Lymphotropic Virus Type 1 mRNA Enables Cap-Independent Translation Initiation
    (2014) Olivares, E.; Landry, D.; Cáceres, C.; Pino, K.; Rossi, F.; Navarrete, C.; Huidobro Toro, J. P.; Thompson, S.; López Lastra, Marcelo Andrés
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    Understanding the use/non-use of an internet-based intervention complementing standard depression treatment: A qualitative study of user\'s experiences
    (2023) Fernández, O.; Pérez, J.C.; Fernández, S.; Krause, M.; Cáceres, C.; Espinosa-Duque, D.
    Introduction: There is sufficient evidence about the effectiveness of internet-based interventions; however, the users’ level of adoption and utilization remains low, with this phenomenon requiring adequate explanation. Objective: The aim of this qualitative study was to explore the users’ perceptions and experience of a web-based program (ASCENSO), designed to complement (usual) in-person depression treatment. Method: Twelve participants of the ASCENSO program, comprised of adult individuals (M = 44.3, SD = 13.4) of both genders (67% women) undergoing treatment for depression, were interviewed through semi-structured interviews. The data obtained from these interviews were analyzed utilizing a constructivist grounded theory approach. The interviews were transcribed and analyzed by trained coders. A constant comparative analysis of emergent themes was conducted. Results: These show that users employ and appreciate the program when their interaction with it emulates a “humanized relationship,” that is, when the program is proactive in assisting users with their requests and when it responds in a pertinent and individualized manner to their emotional states and needs. Conclusions: Our findings highlight the challenges associated with the development of algorithms capable of attracting different potential users. These should be designed to generate a virtual relationship that emulates human interaction and targets the characteristics of each user, for example, considering the specific phenomenology of their health condition, their present emotional states, and perceived needs. Elements that will vary as mental symptomatology evolve. © The Author(s) 2023.
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    VVV-WIT-07 : another Boyajian's star or a Mamajek's object?
    (2019) Saito, R. K.; Minniti, D.; Ivanov, V. D.; Catelan, Márcio; Gran Merino, Felipe Eduardo; Baptista, R.; Angeloni, Rodrigo; Cáceres, C.; Beamin, J. C.