Extrasolar Planets


Explaining the Cold Temperatures Retrieved from Transmission Spectra of Exoplanet Atmospheres

Explaining the Cold Temperatures Retrieved from Transmission Spectra of Exoplanet Atmospheres

Transmission spectroscopy is a powerful technique widely used to probe exoplanet terminators. Atmospheric retrievals of transmission spectra are enabling comparative studies of exoplanet atmospheres.


An Information Theoretic Framework For Classifying Exoplanetary System Architectures

An Information Theoretic Framework For Classifying Exoplanetary System Architectures

We propose several descriptive measures to characterize the arrangements of planetary masses, periods, and mutual inclinations within exoplanetary systems. These measures are based in complexity theory and capture the global, system-level trends of each architecture.


Atmospheric Compositions And Observability Of Nitrogen Dominated Ultra-short Period Super-Earths

Atmospheric Compositions And Observability Of Nitrogen Dominated Ultra-short Period Super-Earths

We explore the chemistry and observability of nitrogen dominated atmospheres for ultra-short-period super-Earths. We base the assumption, that super-Earths could have nitrogen filled atmospheres, on observations of 55 Cnc e that favour a scenario with a high-mean-molecular-weight atmosphere.


Searching the Entirety of Kepler Data: 17 New Planet Candidates Including 1 Habitable Zone World

Searching the Entirety of Kepler Data: 17 New Planet Candidates Including 1 Habitable Zone World

We present the results of an independent search of all ~200,000 stars observed over the four year Kepler mission (Q1-Q17) for multiplanet systems, using a three-transit minimum detection criteria to search orbital periods up to hundreds of days.


Earth-Like: An Education And Outreach Tool For Exploring The Diversity Of Planets Like Our Own

Earth-Like: An Education And Outreach Tool For Exploring The Diversity Of Planets Like Our Own

Earth-Like is an interactive website and twitter bot that allows users to explore changes in the average global surface temperature of an Earth-like planet due to variations in the surface oceans and emerged land coverage, rate of volcanism (degassing), and the level of the received solar radiation.


Planets in Binaries: Formation and Dynamical Evolution

Planets in Binaries: Formation and Dynamical Evolution

Binary systems are very common among field stars. While this relatively small number of planets in binaries is probably partly due to strong observational biases.


Astronomy Student Discovers 17 New Planets, Including Earth-sized World

Astronomy Student Discovers 17 New Planets, Including Earth-sized World

University of British Columbia astronomy student Michelle Kunimoto has discovered 17 new planets, including a potentially habitable, Earth-sized world, by combing through data gathered by NASA's Kepler mission.


EDEN: Sensitivity Analysis and Transiting Planet Detection Limits for Nearby Late Red Dwarfs

EDEN: Sensitivity Analysis and Transiting Planet Detection Limits for Nearby Late Red Dwarfs

Small planets are common around late-M dwarfs and can be detected through highly precise photometry by the transit method. Planets orbiting nearby stars are particularly important as they are often the best-suited for future follow-up studies.


Chemical Diversity of Super-Earths As a Consequence of Formation

Chemical Diversity of Super-Earths As a Consequence of Formation

Recent observations of rocky super-Earths have revealed an apparent wider distribution of Fe/Mg ratios, or core to mantle ratios, than the planets in our Solar System. This study aims to understand how much of the chemical diversity in the super-Earth population can arise from giant impacts during planetary formation.


Sub-Neptune Sized Planet Validated With The Habitable-zone Planet Finder

Sub-Neptune Sized Planet Validated With The Habitable-zone Planet Finder

A signal originally detected by the Kepler spacecraft has been validated as an exoplanet using the Habitable-zone Planet Finder (HPF), an astronomical spectrograph built by a Penn State team and recently installed on the 10m Hobby-Eberly Telescope at McDonald Observatory in Texas.


Stabilization of Dayside Surface Liquid Water Via Tropopause Cold Trapping On Arid Slowly Rotating Tidally Locked Planets

Stabilization of Dayside Surface Liquid Water Via Tropopause Cold Trapping On Arid Slowly Rotating Tidally Locked Planets

Terrestrial-type exoplanets orbiting nearby red dwarf stars (M-dwarfs) are among the best targets for atmospheric characterization and biosignature searches in the near future.


Dynamics of Planetary Systems Within Star Clusters: Aspects of the Solar System's Early Evolution

Dynamics of Planetary Systems Within Star Clusters: Aspects of the Solar System's Early Evolution

Most planetary systems -- including our own -- are born within stellar clusters, where interactions with neighboring stars can help shape the system architecture.


A Mid-infrared Interferometric Survey Of The Planet-forming Region Around Young Sun-like Stars

A Mid-infrared Interferometric Survey Of The Planet-forming Region Around Young Sun-like Stars

We present our results from a mid-infrared interferometric survey targeted at the planet-forming region in the circumstellar disks around low- and intermediate-mass young stars.


Analytical Derivation And Numerical Study Of The Evaporation Valley And Transition From Super-Earths To Sub-Neptunes

Analytical Derivation And Numerical Study Of The Evaporation Valley And Transition From Super-Earths To Sub-Neptunes

Observations have revealed in the Kepler data a depleted region separating smaller super-Earths from larger sub-Neptunes. This can be explained as an evaporation valley between planets with and without H/He that is caused by atmospheric escape.


The Impact of Planetary Rotation Rate on the Reflectance and Thermal Emission Spectrum of Terrestrial Exoplanets Around Sun-like Stars

The Impact of Planetary Rotation Rate on the Reflectance and Thermal Emission Spectrum of Terrestrial Exoplanets Around Sun-like Stars

Robust atmospheric and radiative transfer modeling will be required to properly interpret reflected light and thermal emission spectra of terrestrial exoplanets.


Unveiling Cloudy Exoplanets: The Influence Of Cloud Model Choices On Retrieval Solutions

Unveiling Cloudy Exoplanets: The Influence Of Cloud Model Choices On Retrieval Solutions

In recent years, it has become clear that a substantial fraction of transiting exoplanets have some form of aerosol present in their atmospheres.


Dynamical Characterization Of The Multiple Planet System GJ 1148 and Prospects of Habitable Exomoons Around GJ 1148 b

Dynamical Characterization Of The Multiple Planet System GJ 1148 and Prospects of Habitable Exomoons Around GJ 1148 b

Context. GJ 1148 is an M-dwarf star hosting a planetary system composed of two Saturn-mass planets in eccentric orbits with periods of 41.38 and 532.02 days.


Planet Formation Around M Dwarfs via Disc Instability: Fragmentation Conditions and Protoplanet Properties

Planet Formation Around M Dwarfs via Disc Instability: Fragmentation Conditions and Protoplanet Properties

Context: Around 30 per cent of the observed exoplanets that orbit M dwarf stars are gas giants that are more massive than Jupiter. These planets are prime candidates for formation by disc instability.


A Hot Terrestrial Planet Orbiting The Bright M Dwarf L 168-9 Unveiled By TESS

A Hot Terrestrial Planet Orbiting The Bright M Dwarf L 168-9 Unveiled By TESS

We report the detection of a transiting super-Earth-sized planet (R=1.39+-0.09 Rearth) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V=11, K=7.1) located at 25.15+-0.02 pc.


NESSI Emerges as New Tool for Exoplanet Atmospheres

NESSI Emerges as New Tool for Exoplanet Atmospheres

The darkness surrounding the Hale Telescope breaks with a sliver of blue sky as the dome begins to open, screeching with metallic, sci-fi-like sounds atop San Diego County's Palomar Mountain.



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