playing your cards right: constraining the origin of r ... · playing your cards right:...
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FORGING CONNECTIONS WORKSHOP - 06/28/2017
Playing Your CARDs Right: Constraining the Origin of r-Process Elements Using "One-shot" Enriching Stellar Generation Models
Duane M. Lee Fisk-Vanderbilt Bridge Postdoctoral Fellow
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FORGING CONNECTIONS WORKSHOP - 06/28/2017
Duane M. Lee Fisk-Vanderbilt Bridge Postdoctoral Fellow
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VS
Playing Your CARDs Right: Constraining the Origin of r-Process Elements Using "One-shot" Enriching Stellar Generation Models
Neutron Star Mergers (Rare) Core-Collapse SN
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FORGING CONNECTIONS WORKSHOP - 06/28/2017
Duane M. Lee Fisk-Vanderbilt Bridge Postdoctoral Fellow
2
VS
Playing Your CARDs Right: Constraining the Origin of r-Process Elements Using "One-shot" Enriching Stellar Generation Models
Neutron Star Mergers (Rare) Core-Collapse SN
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FORGING CONNECTIONS WORKSHOP - 06/28/20173
Overview
• Origin of the r-process: NSMs vs CCSN
• “One-shot” models vs other galactic chemical evolution (GCE) models
• Previous results from one-shot models for CCSN mass-dependent yields only
• Some current results including NSMs in one-shot models
• What’s needed to forge better models?
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FORGING CONNECTIONS WORKSHOP - 06/28/20174
Pros (origin of r-process) Cons (not origin of r-process)Neutron Star Mergers Vs Core-Collapse Supernovas
• NSMs readily provide high neutron densities for the r-process
• NSMs are rare events
• CCSN are less rare than NSM events
• CCSN likely occur with much greater variety than NSMs (i.e.,yields)
• Rare CCSN may provide favorable conditions for the r-process
• NSMs may be too rare
• NSMs rely on CCSN as precursors (i.e., rare event on top of rare event)
• NSMs receive escape velocity kicks which may drag ejecta out of a dwarf galaxy
• CCSN do not readily provide high neutron densities for the r-process
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Some Semi-Analytic Galactic Chemical Evolution Models
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• Previous work does not attempt to use CARD densities to work out SFHs or derive n-capture yield constraints
Cescutti & Chiappini (2013)Vincenzo et al. (2014)
non-
rota
ting
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ting
mod
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IMF-
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acks
FORGING CONNECTIONS WORKSHOP - 06/28/2017
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Some Hydrodynamic Galactic Chemical Evolution Models
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• Some attempt to use CARD densities to work out SFHs or derive n-capture yield constraints
Jeon, Besla & Bromm (2017)Safarzadeh & Scannapieco (submitted)
Red stars from Ret II (Ji et al. 2016)
FORGING CONNECTIONS WORKSHOP - 06/28/2017
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• What do I mean by “one-shot” models? • Assume that low-mass dwarf galaxies had a “few” important epochs
(~2-3) of stellar enrichment (i.e. UFDs / ~VMP halo) • Stochastically sample a given mass of stars (MESG) from the IMF • Treat the sample as a one-zone, instantaneously mixed, model
realization of “fossilized” enrichment using mass-dependent yields (𝜅) • Repeat many times to generate a parent chemical abundance ratio
distribution (CARD)
One-shot Galactic Chemical Evolution Models
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• Statistically data-centric approach using CARD densities to work out SFHs or derive n-capture yield constraints
Lee+
(201
3)
FORGING CONNECTIONS WORKSHOP - 06/28/2017
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One-shot Galactic Chemical Evolution Models
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• Statistically data-centric approach using CARD densities to work out SFHs or derive n-capture yield constraints
Lee+ (2013)
FORGING CONNECTIONS WORKSHOP - 06/28/2017
Data from MW & UFDs (Frebel 2010)
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FORGING CONNECTIONS WORKSHOP - 06/28/2017
One-shot Galactic Chemical Evolution Models
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FORGING CONNECTIONS WORKSHOP - 06/28/2017
One-shot Galactic Chemical Evolution Models
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FORGING CONNECTIONS WORKSHOP - 06/28/2017
One-shot Galactic Chemical Evolution Models
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FORGING CONNECTIONS WORKSHOP - 06/28/2017
One-shot Galactic Chemical Evolution Models
Some results for CCSN MDYs
Using 6 UFD stars only!
Using 18 UFD stars!Note: MDYs need to be consistent for both UFD + MW halos progenitors
Low mass SN High mass SN
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• How are NSMs added to “one-shot” models? • Note: The models are normalized by calculating the <[X/Fe]model> zero
offset+<[X/Fe]obs> of the highest MESG (=104.5) with k = 0 • 10,000 realizations of CCSN-only models are post processed to
include NSMs via binomial sampling from NSN for each realization • Here I use MBa ~ 10-3 M⊙ as an example; however, would also compare
with Eu data as well … models would explore a range in mass
One-shot Galactic Chemical Evolution Models
13FORGING CONNECTIONS WORKSHOP - 06/28/2017
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
Parameters from “best-fit” one-shot CCSN-only model est. + literature
VMP MW halo progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
Parameters from “best-fit” one-shot CCSN-only model est. + literature
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
Parameters from “best-fit” one-shot CCSN-only model est. + literature
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
UFD star progenitors
Parameters from “best-fit” one-shot CCSN-only model est. + literature
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
UFD star progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
Parameters from “best-fit” one-shot CCSN-only model estimate only
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
Parameters from “best-fit” one-shot CCSN-only model estimate only
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
Parameters from “best-fit” one-shot CCSN-only model estimate only
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
UFD star progenitors
Parameters from “best-fit” one-shot CCSN-only model estimate only
CCSN-only CARDs with strong Ba MDYs are identical to the CCSN+NSM distribution!
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One-shot Galactic Chemical Evolution Models
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Lee+ (2013)FORGING CONNECTIONS WORKSHOP - 06/28/2017
Observe CARDs
Obtain p-values with model CARDsThe Process Recap
Create a p-value landscape for MESG vs the MDY strength (𝜅)
With NSMs added!
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• One-shot CARD models can provide constraints and interpretations of galactic abundance data (dependent upon the fidelity of assumptions + yield inputs)
• Can be easily extended to include NSMs (& Type Ia, massive AGBs, etc.) • Should be extended to include SFH (i.e. multi-shot models) using cluster
mass functions and treatment for (statistical) mixing
One-shot GCE Summary
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What’s needed to forge better GCE models?
FORGING CONNECTIONS WORKSHOP - 06/28/2017
• Wish List: • For nuclear physicists/astrophysicist:
• Table of mass-dependent yields (elemental only) • List of important abundance ratios to fit (and reasons why? also, are
robust observed data sets available or planned runs slated?) • For simulators (e.g., hydro, n-body,AMR):
• For semi-analytic models, what are the effects of non-uniform mixing and how can that be incorporated into the models?
• What is the cluster mass function in dwarf galaxies? • For observers:
• What is feasible to observe and how rich of a data set can you provide with uniform systematics?
• What odd or interesting chemical abundance patterns do you see as important to explore in GCE models?
• When can I ignore NLTE effects? Can I? Ever? Please!??? • For experimentalists:
• What readily-observed abundance patterns can be easily distilled into reaction rate constraints or other data products useful to you?
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
Parameters from “best-fit” one-shot CCSN-only model est. + literature
VMP MW halo progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
Parameters from “best-fit” one-shot CCSN-only model est. + literature
VMP MW halo progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
VMP MW halo progenitors
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One-shot Galactic Chemical Evolution Models
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
UFD star progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
UFD star progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
UFD star progenitors
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017
UFD star progenitors
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One-shot Galactic Chemical Evolution Models
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One-shot Galactic Chemical Evolution Models
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One-shot Galactic Chemical Evolution Models
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One-shot Galactic Chemical Evolution Models
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One-shot Galactic Chemical Evolution Models
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One-shot Galactic Chemical Evolution Models
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One-shot Galactic Chemical Evolution Models
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One-shot Galactic Chemical Evolution Models
FORGING CONNECTIONS WORKSHOP - 06/28/2017