false signs of life: abiotic o3 buildup on planets around m-dwarfs shawn domagal-goldman (uw)
DESCRIPTION
BattlestarGalactica , 2003. False Signs of Life: Abiotic O3 Buildup on Planets Around M-Dwarfs Shawn Domagal-Goldman (UW). Acknowledgements & Collaborators. Victoria Meadows Ty Robinson Noe Khafka Mark Claire James Kasting Antigona Segura IGERT/NSF VPL/NAI. Spectral model. - PowerPoint PPT PresentationTRANSCRIPT
False Signs of Life:Abiotic O3 Buildup on
Planets Around M-DwarfsShawn Domagal-Goldman (UW)Ba
ttles
tarG
alac
tica,
200
3
Victoria Meadows Ty Robinson Noe Khafka Mark Claire James Kasting Antigona Segura IGERT/NSF VPL/NAI
Acknowledgements & Collaborators
Spectral model
Chemistry Model
Salary & Computers
Beich
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, Woo
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Beich
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Beich
man
, Woo
lf, a
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Original Question:Are there anoxic biosignatures?
New
Wor
lds O
bser
ver,
2008
Original Question:Are there anoxic biosignatures?
Original Question:Are there anoxic biosignatures?
CH3SHC2H6
CH3SHC2H6
Dom
agal
-Gol
dman
et a
l., in
pre
p.
Original Question:Are there anoxic biosignatures?Yes. But only for planets that orbit M-dwarfs and have high production rates of organic S.
Stumbled Upon Question:Are there ways to make O3 without cyanobacteria?
very
preli
minary
!!
Are there ways to make O3 without cyanobacteria?Are there ways to make without cyanobacteria? Yes.
Dom
agal
-Gol
dman
et a
l., in
pre
p.
How is the O3 madewithout cyanobacteria?
Segu
ra e
t al.,
200
5
How is the O3 madewithout cyanobacteria?
Segu
ra e
t al.,
200
5
O3 + hn O2 + OO3 + hn O2 + O1D
SO2 + hn (SO2)1O2 + hn O + O1D
CO2 + hn CO + O1DCO2 + hn CO + OH2O + hn H + OH
H2CO + hn HCO + HH2CO + hn H2 + CO
SO2 + hn SO + OO2 + hn O + O
Is this signal observable?
C2H6
O3
C2H6
O3
Dom
agal
-Gol
dman
et a
l., in
pre
p.
AD Leo
log (fCH4)
log
(fCO
2)m
ax fO3 (ppb)
Haze
Dom
agal
-Gol
dman
et a
l., in
pre
p.
Is this signal distinguishable?
C2H6
O3
C2H6
O3
Dom
agal
-Gol
dman
et a
l., in
pre
p.
Results/Conclusions This may be something we have to
worry about… but we need to couple the photochemical code to a climate code to verify this result.
Fortunately, the O3 buildup is limited to planets around M-stars… and a haze that is almost certainly detectable.
Future “worry tests”: Planet with lower CO2 levels Planet around a “quieter” M-Dwarf Planet with higher/lower H escape
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Questions?