<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">And i forgot to mention that tomorrow Christoffer Fremling is going to defend his licentiate thesis,<div class="">you are all welcome to attend:</div><div class=""><br class=""></div><div class="">cheers</div><div class=""><br class=""></div><div class="">/Francesco<br class=""><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);" class=""><a href="http://agenda.albanova.se/conferenceDisplay.py?confId=5966" class="">http://agenda.albanova.se/conferenceDisplay.py?confId=5966</a></div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);" class=""><br class=""></div><div id="Signature" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);" class=""><div name="divtagdefaultwrapper" style="margin: 0px;" class=""><span class="titles">iPTF13bvn and PTF12os -- Two stripped-envelope supernovae discovered by the intermediate Palomar Transient Factory</span><br class=""> <span class="categname"><br class=""></span>Tuesday 08 November 2016<br class="">from <span class="bold">13:00</span> to <span class="bold">15:00</span><br class="">at <span class="">FC61</span> <strong class="">Speaker :</strong> <strong class="">Christoffer Fremling<em class=""> (Stockholm University)</em></strong> <strong class="">Abstract :</strong> This thesis is based on research made by the intermediate Palomar Transient Factory [(i)PTF], and it is particularly closely tied to the still ongoing research on the stripped-envelope (SE) supernova (SN), iPTF13bvn (Type Ib), that occurred in the nearby galaxy NGC 5806. This SN was initially thought to have been the explosion of a very massive Wolf-Rayet (WR) star, but I have shown that this is very likely not the case. I suggest instead that the most likely scenario is that iPTF13bvn originated from a binary system where the envelope was stripped off from the SN progenitor by tidal forces from a companion star, in a similar way as for the very well studied Type IIb SN 2011dh. I have also investigated another SE SN, PTF12os (Type IIb), that occurred in the same galaxy as iPTF13bvn, with the conclusion that PTF12os and iPTF13bvn are very similar amongst themselves, and that both of them are also remarkably similar to SN 2011dh, in terms of all of the available observations (light-curves, spectra). Hydrodynamical models have been used to constrain the explosion parameters of iPTF13bvn, PTF12os and SN 2011dh; finding 56Ni masses in the range 0.063 − 0.075 M⊙, ejecta masses in the range 1.85 − 1.91 M⊙. Using the 56Ni-masses derived from our hydrodynamical modeling in combination with nebular models and late-time spectroscopy we were able to constrain the Zero-Age Main Sequence (ZAMS) mass to ∼ 12 M⊙ for iPTF13bvn and ≲ 15 M⊙ for PTF12os. In current stellar evolution models, stars with these masses on the ZAMS cannot lose their hydrogen envelopes and become SE SNe without binary interactions.</div></div><div apple-content-edited="true" class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">-------------------------------------------</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">Francesco Taddia</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">Postdoctoral Researcher</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">Department of Astronomy</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">Stockholm University, Sweden</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy"><a href="mailto:ftadd@astro.su.se" class="">ftadd@astro.su.se</a></font></div></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
</div>
<br class=""><div><blockquote type="cite" class=""><div class="">On 07 Nov 2016, at 10:30, Francesco Taddia <<a href="mailto:ftadd@astro.su.se" class="">ftadd@astro.su.se</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear all,<div class=""><br class=""></div><div class="">this Thursday we will have Mattia Bulla talking about spectropolarization in Supernovae Type Ia,</div><div class=""><br class=""></div><div class="">see you in the KTH meeting room on the 5th floor at 13:00,</div><div class=""><br class=""></div><div class="">cheers</div><div class=""><br class=""></div><div class="">/Francesco</div><div class=""><br class=""></div><div class=""><br class=""><div apple-content-edited="true" class="">
<div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">-------------------------------------------</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">Francesco Taddia</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">Postdoctoral Researcher</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">Department of Astronomy</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy">Stockholm University, Sweden</font></div><div style="orphans: 2; widows: 2;" class=""><font class="Apple-style-span" face="Noteworthy"><a href="mailto:ftadd@astro.su.se" class="">ftadd@astro.su.se</a></font></div></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
</div>
<br class=""></div></div></div></blockquote></div><br class=""></div></div></body></html>