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Extreme water loss and abiotic O2 buildup on planets throughout the habitable zones of M dwarfs.
In general, it is found that the initial phase of high luminosity may compromise the habitability of many terrestrial planets orbiting low-mass stars.
A seven-planet resonant chain in TRAPPIST-1
The TRAPPIST-1 system is the first transiting planet system found orbiting an ultra-cool dwarf star. At least seven planets similar to Earth in radius and in mass were previously found to transit…
EVEREST: Pixel Level Decorrelation of K2 Light curves
We present EVEREST, an open-source pipeline for removing instrumental noise from K2 light curves. EVEREST employs a variant of pixel level decorrelation (PLD) to remove systematics introduced by the…
An Update to the EVEREST K2 Pipeline: Short Cadence, Saturated Stars, and Kepler-like Photometry Down to Kp = 15
- R. Luger, E. Kruse, D. Foreman-Mackey, E. Agol, Nicholas Saunders
- PhysicsThe Astronomical Journal
- 17 February 2017
We present an update to the EVEREST K2 pipeline that addresses various limitations in the previous version and improves the photometric precision of the de-trended light curves. We develop a fast…
Habitable evaporated cores: transforming mini-Neptunes into super-Earths in the habitable zones of M dwarfs.
- R. Luger, R. Barnes, E. Lopez, J. Fortney, B. Jackson, V. Meadows
- Geology, PhysicsAstrobiology
- 15 January 2015
We show that photoevaporation of small gaseous exoplanets ("mini-Neptunes") in the habitable zones of M dwarfs can remove several Earth masses of hydrogen and helium from these planets and transform…
Evolved Climates and Observational Discriminants for the TRAPPIST-1 Planetary System
The TRAPPIST-1 planetary system provides an unprecedented opportunity to study terrestrial exoplanet evolution with the James Webb Space Telescope (JWST) and ground-based observatories. Since M dwarf…
EXOFASTv2: A public, generalized, publication-quality exoplanet modeling code
The next generation public exoplanet fitting software, EXOFASTv2, is presented and several state-of-the-art ways to constrain its properties are provided, including taking advantage of the now-ubiquitous all-sky catalog photometry and Gaia parallaxes.
The Habitability of Proxima Centauri b I: Evolutionary Scenarios
We analyze the evolution of the potentially habitable planet Proxima Centauri b to identify environmental factors that affect its long-term habitability. We consider physical processes acting on size…
The Habitability of Proxima Centauri b: Environmental States and Observational Discriminants
1-D coupled climate-photochemical models are used to generate self-consistent atmospheres for several evolutionary scenarios, including high-O2, high-CO2, and more Earth-like atmospheres, with both oxic and anoxic compositions, and show that these modeled environments can be habitable or uninhabitable at Proxima Cen b's position in the habitable zone.
IDENTIFYING PLANETARY BIOSIGNATURE IMPOSTORS: SPECTRAL FEATURES OF CO AND O4 RESULTING FROM ABIOTIC O2/O3 PRODUCTION.
- E. Schwieterman, V. Meadows, R. Barnes
- Physics, GeologyThe astrophysical journal. Letters
- 17 February 2016
If JWST-NIRISS and/or NIRSpec observe CO in conjunction with CO2 in the transmission spectrum of a terrestrial planet it could indicate robust CO2 photolysis and suggest that a future detection of O2 or O3 might not be biogenic, the first explicit self-consistent simulations of these spectral discriminants as they may be seen by James Webb Space Telescope are produced.