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CATEGORIES:College of Arts and Sciences
DESCRIPTION:Abstract: Identifying the astrophysical sources of the heaviest
  r-process elements requires connecting the conditions in neutron-rich out
 flows to their nucleosynthetic yields. Kilonova observations provide one a
 venue for investigating these sources, but the absence of a detectable kil
 onova does not necessarily exclude heavy-element production. Black hole-ne
 utron star mergers near the tidal-disruption threshold offer a setting in 
 which a remnant accretion disk may support a relativistic jet while the ki
 lonova remains faint. I will present numerical-relativity simulations with
  the Spectral Einstein Code (SpEC), including Monte Carlo neutrino transpo
 rt, of binaries in the mass regime of GW230529. Focusing on two nuclear eq
 uations of state, SFHo and DD2, I will compare configurations selected at 
 comparable offsets above their respective predicted disruption thresholds.
  Although both produce small amounts of dynamical ejecta, their outflows d
 iffer in electron fraction, temperature, and angular distribution, providi
 ng distinct initial conditions for r-process nucleosynthesis. I will discu
 ss the implications of these ejecta properties for r-process yields, their
  connection to ongoing collaborative nucleosynthesis calculations, and how
  these results motivate investigating spin misalignment and precession as 
 additional influences on merger outflows\nEvent page: https://www.umassd.e
 du/events/cms/11-18-26-equation-of-state-dependence-of-black-holeneutron-s
 tar-merger-ejecta.php\nEvent link: https://www.cscdr.umassd.edu/seminars
X-ALT-DESC;FMTTYPE=text/html:<html><body><p>Abstract:</p>\n<p>Identifying t
 he astrophysical sources of the heaviest r-process elements requires conne
 cting the conditions in neutron-rich outflows to their nucleosynthetic yie
 lds. Kilonova observations provide one avenue for investigating these sour
 ces\, but the absence of a detectable kilonova does not necessarily exclud
 e heavy-element production. Black hole-neutron star mergers near the tidal
 -disruption threshold offer a setting in which a remnant accretion disk ma
 y support a relativistic jet while the kilonova remains faint. I will pres
 ent numerical-relativity simulations with the Spectral Einstein Code (SpEC
 )\, including Monte Carlo neutrino transport\, of binaries in the mass reg
 ime of GW230529. Focusing on two nuclear equations of state\, SFHo and DD2
 \, I will compare configurations selected at comparable offsets above thei
 r respective predicted disruption thresholds. Although both produce small 
 amounts of dynamical ejecta\, their outflows differ in electron fraction\,
  temperature\, and angular distribution\, providing distinct initial condi
 tions for r-process nucleosynthesis. I will discuss the implications of th
 ese ejecta properties for r-process yields\, their connection to ongoing c
 ollaborative nucleosynthesis calculations\, and how these results motivate
  investigating spin misalignment and precession as additional influences o
 n merger outflows</p><p>Event page: <a href="https://www.umassd.edu/events
 /cms/11-18-26-equation-of-state-dependence-of-black-holeneutron-star-merge
 r-ejecta.php">https://www.umassd.edu/events/cms/11-18-26-equation-of-state
 -dependence-of-black-holeneutron-star-merger-ejecta.php</a><br>Event link:
  <a href="https://www.cscdr.umassd.edu/seminars">https://www.cscdr.umassd.
 edu/seminars</a></p></body></html>
DTSTAMP:20261112T150134
DTSTART;TZID=America/New_York:20261118T130000
DTEND;TZID=America/New_York:20261118T140000
LOCATION:Textiles 105A (CSCDR)
SUMMARY;LANGUAGE=en-us:CSCDR seminar with Tia Martineau (University of New 
 England), "Equation-of-State Dependence of Black Hole–Neutron Star Merge
 r Ejecta: Implications for Heavy-Element Production”
UID:adefd5f12d02a29a529b0eab38c011ef@www.umassd.edu
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