SN 2005bf: A possible transition event between type Ib/c supernovae and gamma-ray bursts

We present u′g′r′i′BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ∼100 days following discovery. The u′g′BV light curves displayed an unprecedented morphology among Type Ib/Ic supernovae, with an initial maximum some 2 weeks after discovery and a second, main maximum about 25 days after that. The bolometric light curve indicates that SN 2005bf was a remarkably luminous event, radiating at least 6.3 × 1042 ergs s -1 at maximum light and a total of 2.1 × 1049 ergs during the first 75 days after the explosion. Spectroscopically, SN 2005bf underwent a unique transformation from a Type Ic-like event at early times to a typical Type Ib supernova at later phases. The initial maximum in u′g′BV was accompanied by the presence in the spectrum of high-velocity (>14,000 km s-1) absorption lines of Fe II, Ca II, and H I. The photospheric velocity derived from spectra at early epochs was below 10,000 km s-1, which is unusually low compared with ordinary Type Ib supernovae. We describe one-dimensional computer simulations that attempt to account for these remarkable properties. The most favored model is that of a very energetic (2 × 1051 ergs), asymmetric explosion of a massive (8.3 M⊙) Wolf-Rayet WN star that had lost most of its hydrogen envelope. We speculate that an unobserved relativistic jet was launched producing a two-component explosion consisting of (1) a polar explosion containing a small fraction of the total mass and moving at high velocity and (2) the explosion of the rest of the star. At first, only the polar explosion is observed, producing the initial maximum and the high-velocity absorption-line spectrum resembling a Type Ic event. At late times, this fast-moving component becomes optically thin, revealing the more slowly moving explosion of the rest of the star and transforming the observed spectrum to that of a typical Type Ib supernova. If this scenario is correct, then SN 2005bf is the best example to date of a transition object between normal Type Ib/Ic supernovae and γ-ray bursts.Facultad de Ciencias Astronómicas y Geofísica

SN 2005bf: A Possible Transition Event Between Type Ib/c Supernovae and Gamma Ray Bursts

We present u'g'r'i'BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ~100 days following discovery. The u'g'BV light curves displayed a double-peaked morphology, which is among Type Ib/Ic supernovae. The bolometric light curve indicates that SN 2005bf was a remarkably luminous event. Spectroscopically, SN 2005bf underwent a unique transformation from a Type Ic-like event at early times to a typical Type Ib supernova at later phases. The initial maximum in u'g'BV was accompanied by the presence in the spectrum of high velocity absorption lines of Fe II, Ca II, and H I. The photospheric velocity derived from spectra at early epochs was unusually low compared with ordinary Type Ib supernovae. We describe one-dimensional computer simulations which attempt to account for these remarkable properties. The most favored model is that of a very energetic (2 x 10^{51} erg), asymmetric explosion of a massive (8.3 M_sun) Wolf-Rayet WN star that had lost most of its hydrogen envelope. We speculate that an unobserved relativistic jet was launched producing a two-component explosion consisting of 1) a polar explosion containing a small fraction of the total mass and moving at high velocity, and 2) the explosion of the rest of the star. At first, only the polar explosion is observed, producing the initial maximum and the high velocity absorption-line spectrum resembling a Type Ic event. At late times, this fast-moving component becomes optically-thin, revealing the slower-moving explosion of the rest of the star and transforming the observed spectrum to that of a typical Type Ib supernova. If this scenario is correct, then SN 2005bf is the best example to date of a transition object between normal Type Ib/Ic supernovae and gamma ray bursts.Comment: Accepted ApJ on 15 December 2005, 37 pages, 11 figures; minor changes after refereeing proces

SN 2005bf: A possible transition event between type Ib/c supernovae and gamma-ray bursts

We present u′g′r′i′BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ∼100 days following discovery. The u′g′BV light curves displayed an unprecedented morphology among Type Ib/Ic supernovae, with an initial maximum some 2 weeks after discovery and a second, main maximum about 25 days after that. The bolometric light curve indicates that SN 2005bf was a remarkably luminous event, radiating at least 6.3 × 1042 ergs s -1 at maximum light and a total of 2.1 × 1049 ergs during the first 75 days after the explosion. Spectroscopically, SN 2005bf underwent a unique transformation from a Type Ic-like event at early times to a typical Type Ib supernova at later phases. The initial maximum in u′g′BV was accompanied by the presence in the spectrum of high-velocity (>14,000 km s-1) absorption lines of Fe II, Ca II, and H I. The photospheric velocity derived from spectra at early epochs was below 10,000 km s-1, which is unusually low compared with ordinary Type Ib supernovae. We describe one-dimensional computer simulations that attempt to account for these remarkable properties. The most favored model is that of a very energetic (2 × 1051 ergs), asymmetric explosion of a massive (8.3 M⊙) Wolf-Rayet WN star that had lost most of its hydrogen envelope. We speculate that an unobserved relativistic jet was launched producing a two-component explosion consisting of (1) a polar explosion containing a small fraction of the total mass and moving at high velocity and (2) the explosion of the rest of the star. At first, only the polar explosion is observed, producing the initial maximum and the high-velocity absorption-line spectrum resembling a Type Ic event. At late times, this fast-moving component becomes optically thin, revealing the more slowly moving explosion of the rest of the star and transforming the observed spectrum to that of a typical Type Ib supernova. If this scenario is correct, then SN 2005bf is the best example to date of a transition object between normal Type Ib/Ic supernovae and γ-ray bursts.Facultad de Ciencias Astronómicas y Geofísica

Gluttony, excess, and the fall of the planter class in the British Caribbean

Food and rituals around eating are a fundamental part of human existence. They can also be heavily politicized and socially significant. In the British Caribbean, white slaveholders were renowned for their hospitality towards one another and towards white visitors. This was no simple quirk of local character. Hospitality and sociability played a crucial role in binding the white minority together. This solidarity helped a small number of whites to dominate and control the enslaved majority. By the end of the eighteenth century, British metropolitan observers had an entrenched opinion of Caribbean whites as gluttons. Travelers reported on the sumptuous meals and excessive drinking of the planter class. Abolitionists associated these features of local society with the corrupting influences of slavery. Excessive consumption and lack of self-control were seen as symptoms of white creole failure. This article explores how local cuisine and white creole eating rituals developed as part of slave societies and examines the ways in which ideas about hospitality and gluttony fed into the debates over slavery that led to the dismantling of slavery and the fall of the planter class

Gay and bisexual men’s views on reforming blood donation policy in Canada: a qualitative study

Abstract Background Researchers and activists have long called for changes to blood donation policies to end what is frequently framed as unjustified bans or deferral periods for men who have sex with men (MSM). Since 2016, in Canada, a man had to be abstinent from all sexual contact (anal or oral sex) with other men for at least 12 months in order to be an eligible blood donor. As of June 3, 2019, this deferral period was reduced to 3 months. Methods To better understand the acceptance of existing deferral policies and possible future policy, we conducted 47 in-depth interviews with a demographically diverse sample of gay, bisexual, queer, and other men who have sex with men (GBM) in Canada’s three largest cities: Vancouver, (n = 17), Toronto (n = 15), and Montreal (n = 15). Interviews were coded in NVivo 11 following an inductive thematic analysis. We focus on men’s preferred policy directions and their opinions about a policy change proposed by Canada’s blood operators: a 3-month deferral for all sexual activity between men. We interviewed GBM approximately one-year before this new deferral policy was approved by Health Canada. Results Most participants were opposed to any deferral period in relation to MSM-specific sexual activity. A fair and safe policy was one that was the “same for everyone” and included screening for several risk factors during the blood donation process with no categorical exclusion of all sexually active MSM. Participants believed that multiple “gender blind” and HIV testing-related strategies could be integrated into the blood donation process. These preferences for a move away from MSM-specific exclusions aligned with their opinions concerning the possible change to a 3-month MSM deferral, for which participants shared three overarching perspectives: (1) step in the right direction; (2) ambivalence and uncertainty; and (3) not an improvement. Conclusion A predominant assertion was that a change from a 12-month to a 3-month deferral period would not resolve the fundamental issues of fairness and equity affecting blood screening practices for GBM in Canada. Many participants believed that blood donation policy should be based on more up-to-date scientific evidence concerning risk factor assessment and HIV testing

'I was just doing what a normal gay man would do, right?': The biopolitics of substance use and the mental health of sexual minority men

Drawing on 24 interviews conducted with gay, bisexual, queer and other men who have sex with men (GBM) living in Toronto, Canada, we examined how they are making sense of the relationship between their mental health and substance use. We draw from the literature on the biopolitics of substance use to document how GBM self-regulate and use alcohol and other drugs (AODC) as technologies of the self. Despite cultural understandings of substance use as integral to GBM communities and subjectivity, GBM can be ambivalent about their AODC. Participants discussed taking substances positively as a therapeutic mental health aid and negatively as being corrosive to their mental wellbeing. A fine line was communicated between substance use being self-productive or self-destructive. Some discussed having made 'problematic' or 'unhealthy' drug-taking decisions, while others presented themselves as self-controlled, responsible neoliberal actors doing 'what a normal gay man would do'. This ambivalence is related to the polarizing binary community and scientific discourses on substances (i.e. addiction/healthy use, irrational/rational, uncontrolled/controlled). Our findings add to the critical drug literature by demonstrating how reifying and/or dismantling the coherency of such substance use binaries can serve as a biopolitical site for some GBM to construct their identities and demonstrate healthy, 'responsible' subjectivity.This study was supported by the Canadian Institutes of Health Research [#TE2-138299]; the Canadian Association for HIV/AIDS Research [#Engage]; and the Ontario HIV Treatment Network [#1051]. Daniel Grace is supported by a Canada Research Chair in Sexual and Gender Minority Health

"You're Gay, It's Just What Happens": Sexual Minority Men Recounting Experiences of Unwanted Sex in the Era of MeToo

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.Our grounded theory analysis derives from in-depth interviews conducted with 24 gay, bisexual, queer, and other men who have sex with men (GBM) living in Toronto, Canada, to understand their experiences of sexual coercion. Participants drew on discourse from the #MeToo movement to reconsider the ethics of past sexual experiences. The idea that gay or queer sex is inherently risky and unique from heterosexual relations made negotiating sexual safety challenging. These notions were enforced by homophobic discourses on the one hand, and counter discourses of sexual liberation, resistance to heteronormativity, hegemonic masculinity, and HIV prevention on the other. Biomedical advances in HIV prevention such as pre-exposure prophylaxis (PrEP) and undetectable viral load affected how some participants felt about sexual autonomy and safety. Participants held themselves responsible for needing to be more assertive within sexual encounters to avoid coercion. Many believed that unwanted sex is unavoidable among GBM: if "you're gay, it's just what happens." Targeted education aimed at GBM communities that incorporates insights on GBM sexual subcultures is necessary. This work must be situated within a broader understanding of how gender norms and hegemonic masculinity, racism, HIV status, and other power imbalances affect sexual decision-making, consent, pleasure, and sexual harm.Engage/Momentum II is funded by the Canadian Institutes for Health Research (CIHR, #TE2-138299; #FDN=143342; #PJT-153139), the Canadian Foundation for AIDS Research (CANFAR), the Ontario HIV Treatment Network (OHTN, #1051), the Public Health Agency of Canada (#4500345082), and Ryerson University. Trevor A. Hart is supported by an Ontario HIV Treatment Network Chair in Gay and Bisexual Men’s Health. Daniel Grace is supported by a Canada Research Chair in Sexual and Gender Minority Health

Stepping Stones or Second Class Donors?: a qualitative analysis of gay, bisexual, and queer men's perspectives on plasma donation policy in Canada

Background: Men who have sex with men (MSM) are not eligible to donate blood or plasma in Canada if they have had sex with another man in the last 3 months. This time-based deferment has reduced since 2013; from an initial lifetime ban, to five-years, one-year, and now three-months. Our previous research revealed that gay, bisexual, queer, and other MSM (GBM) supported making blood donation policies gender-neutral and behaviour-based. In this analysis, we explored the willingness of Canadian GBM to donate plasma, even if they were not eligible to donate blood. Methods: We conducted in-depth interviews with 39 HIV-negative GBM in Vancouver (n = 15), Toronto (n = 13), and Montreal (n = 11), recruited from a large respondent-driven sampling study called Engage. Men received some basic information on plasma donation prior to answering questions. Transcripts were coded in NVivo following inductive thematic analysis. Results: Many GBM expressed a general willingness to donate plasma if they became eligible; like with whole blood donation, GBM conveyed a strong desire to help others in need. However, this willingness was complicated by the fact that most participants had limited knowledge of plasma donation and were unsure of its medical importance. Participants’ perspectives on a policy that enabled MSM to donate plasma varied, with some viewing this change as a “stepping stone” to a reformed blood donation policy and others regarding it as insufficient and constructing GBM as “second-class” donors. When discussing plasma, many men reflected on the legacy of blood donor policy-related discrimination. Our data reveal a significant plasma policy disjuncture—a gulf between the critical importance of plasma donation from the perspective of Canada’s blood operators and patients and the feelings of many GBM who understood this form of donation as less important. Conclusions: Plasma donor policies must be considered in relation to MSM blood donation policies to understand how donor eligibility practices are made meaningful by GBM in the context of historical disenfranchisement. Successful establishment of a MSM plasma donor policy will require extensive education, explicit communication of how this new policy contributes to continued/stepwise reform of blood donor policies, and considerable reconciliation with diverse GBM communities.This research received funding support from the Canadian Blood Services MSM Research Grant Program, funded by the federal government (Health Canada) and the provincial and territorial ministries of health. The views herein do not necessarily reflect the views of Canadian Blood Services or the federal, provincial, or territorial governments of Canada. The larger Engage study is funded by the Canadian Institutes of Health Research (#TE2–138299), the Canadian Association for HIV/AIDS Research (#Engage), the Ontario HIV Treatment Network (#1051), and Ryerson University. DG is supported by a Canada Research Chair in Sexual and Gender Minority Health. NJL is supported by a Scholar Award from the Michael Smith Foundation for Health Research (#16863). DJB and TAH are supported by OHTN Research Chairs in Gay and Bisexual Men’s Health