The Large Interferometer For Exoplanets (LIFE): the science of char...

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LIFE -
the Large Interferometer for Exoplanets
Daniel Angerhausen
ETH Zürich
LIFE initiative
How to search for
extrasolar ...

Why is this important for
ESA ACT?
3

ESA ACT connection
ESA Voyage 2050

5
ESA ACT connection
Advanced Technology
ESA Voyage 2050
Talk next week by
Sascha Quanz

6
ESA ACT connection
Advanced Technology
ESA Voyage 2050 Machine Learning
Talk next week by
Sascha Quanz

ESA news
7
ESA announcement regarding
Voyage 2050
contained language supporting the launch of
"A large mission enabling th...

How will we ﬁnd and characterize habitable
exoplanets in the next decades?
8

Image credit: NASA/JPL
10
Schwieterman et al. 2017

Image credit: NASA/JPL Caltech
11
Schwieterman et al. 2017

Roadmap
12
Image credit: (adapted from) NASA/JPL/Caltech; https://exoplanets.nasa.gov/exep/technology/technology-overview/...

Our vision - your vision?
LIFE shall obtain thermal emission spectra with suﬃcient
spectral resolution, wavelength coverag...

Heritage
Space based (MIR,
nulling) interferometry
is not a new idea.
What is new is that we
now know Exoplanet
statistics...

Nulling for Noobs
15

16
Nulling 101
Credit: D. Rouan
Bracewell interferometer (Nature 274:780, 1978)
More:
Talk next week by
Sascha Quanz

17
Nulling Level 2
Defrère et al. 2018b

18
Nulling Level 2
Defrère et al. 2018b

19
Nulling Level 2
Defrère et al. 2018b

20
Nulling Level 2
Defrère et al. 2018b

Detection Yield
(ﬁrst 2.5 y - search phase)
21

How many can we ﬁnd with LIFE?

23
Detection phase
-Simulated a “scan” of the solar neighborhood
-Catalog of 1732 FGKM stars within 20 pc
-Using known pla...

Detection Yield
24
-hundreds of planets
-dozens of temperate rocky ones
-most of them only accessible
with LIFE
LIFE I Qua...

Characterization Science
Second 2.5 y - characterization phase
25

26
... it gets you MIR spectra

27
LIFE Simulator
Description of the
Simulator Pipeline:
Generation of a synthetic
planet population
Astrophysical noise s...

28
... it gets you MIR spectra

29
The “Earth in Time” project
Two main questions:
How does the routine perform
if we use simulated data
produced by other...

30
Exoplanet Yield Predictions
Connect scientiﬁc goals and
technical mission
requirements by studying
the predicted instru...

Cloudy Venus-Twin Retrievals
Why consider Venus?
● Venus is at inner edge
of the habitable zone.
● Large diﬀerences
betwee...

Inventory of PH3 with LIFE
32
LIFE IV
Angerhausen
et al. in prep

Comprehensive Habitability Stats
LIFE will enable
comparative studies
of potentially habitable
environments.
Sample size i...

Planetary Composition/Structure
(inferred, Planet Params. ~10-20*)
*not only need for best ﬁt model,
but also quantify unc...

Posteriors from MC or nested sampling
This is the current “gold
standard”
-works ﬁne for single
observations
-hours to day...

Posteriors from ML?
-faster, more dimensions - ideal for (LIFE)
survey simulation
-existing methods for transit observatio...

Posteriors from ML?
-faster, more dimensions - ideal for (LIFE)
survey simulation
-existing methods for transit observatio...

Supplementary Science
38

Take home message
In the next decades we will have the technologies
to systematically search for life in our
neighborhood....

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