Star-Planet Interactions and Habitability: Radiative Effects

Segura, A.

doi:10.1007/978-3-319-30648-3_73-1

Cited by 5 publications

(3 citation statements)

References 124 publications

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“…Interactions between the magnetospheres of the star and the planet can cause magnetic reconnections that can produce a beam of charged particles hitting the upper stellar atmosphere and consequently releasing energy in the form of flares. Flares can be emitted in all wavelengths but are particularly prominent in X-rays and UV (Segura 2018). UV radiation due to chromospheric activity is particularly significant in case of low-mass dwarf stars.…”

Section: Introductionmentioning

confidence: 99%

A Statistical Search for Star–Planet Interaction in the Ultraviolet Using GALEX

Viswanath

Narang

Manoj

et al. 2020

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Most (∼82%) of the over 4000 confirmed exoplanets known today orbit very close to their host stars, within 0.5 au. Planets at such small orbital distances can result in significant interactions with their host stars, which can induce increased activity levels in them. In this work, we have searched for statistical evidence for Star-Planet Interactions (SPI) in the ultraviolet (UV) using the largest sample of 1355 GALEX detected host stars with confirmed exoplanets and making use of the improved host star parameters from Gaia DR2. From our analysis, we do not find any significant correlation between the UV activity of the host stars and their planetary properties. We further compared the UV properties of planet host stars to that of chromospherically active stars from the RAVE survey.Our results indicate that the enhancement in chromospheric activity of host stars due to star-planet interactions may not be significant enough to reflect in their near and far UV broad band flux.

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Section: Introductionmentioning

confidence: 99%

A Statistical Search for Star–Planet Interaction in the Ultraviolet Using GALEX

Viswanath

Narang

Manoj

et al. 2020

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“…The existence and persistence of stratospheric ozone in planetary atmospheres is fundamentally important for the protection and development of surface life (Segura 2018). Simulated K-and M-star planet atmospheres (Figure 3a-l and Extended Data Figure 4a-l) experience greater instantaneous ozone destruction compared to magnetized G-star planets (Figure 2a-l).…”

Section: D Effects Of Large Stellar Flares (Results)mentioning

confidence: 99%

Persistence of Flare-Driven Atmospheric Chemistry on Rocky Habitable Zone Worlds

Chen,

Zhan,

Youngblood

et al. 2021

Preprint

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Low-mass stars show evidence of vigorous magnetic activity in the form of large flares and coronal mass ejections. Such space weather events may have important ramifications for the habitability and observational fingerprints of exoplanetary atmospheres. Here, using a suite of three-dimensional coupled chemistry-climate model (CCM) simulations, we explore effects of time-dependent stellar activity on rocky planet atmospheres orbiting G-, K-, and M-dwarf stars. We employ observed data from the MUSCLES campaign and Transiting Exoplanet Satellite Survey and test a range of rotation period, magnetic field strength, and flare frequency assumptions. We find that recurring flares drive K-and M-dwarf planet atmospheres into chemical equilibria that substantially deviate from their pre-flare regimes, whereas G-dwarf planet atmospheres quickly return to their baseline states. Interestingly, simulated O 2 -poor and O 2 -rich atmospheres experiencing flares produce similar mesospheric nitric oxide abundances, suggesting that stellar flares can highlight otherwise undetectable chemical species. Applying a radiative transfer model to our CCM results, we find that flare-driven transmission features of bio-indicating species, such as nitrogen dioxide, nitrous oxide, and nitric acid, show particular promise for detection by future instruments.

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“…Therefore, we present below a brief overview of the dominant effects by which a star will have an impact on the habitability of planets in orbit around it. A more general list of all the effects that can affect the habitability of planets is provided in Segura (2018) and but the main influence comes from the type of the host star, which strongly impacts both the possible lifespan of habitable conditions and our ability to remotely probe planetary environments. Stars more massive than 2.5 M live less than 1 Gyr and during this short life their luminosity increases dramatically offering conditions compatible for life on their planets for a fraction of this lifetime only.…”

Section: Introductionmentioning

confidence: 99%

Main ways in which stars influence the climate and surface habitability of their planets

Turbet,

Selsis

2021

Preprint

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We present a brief overview of the main effects by which a star will have an impact (positive or negative) on the surface habitability of planets in orbit around it. Specifically, we review how spectral, spatial and temporal variations in the incident flux on a planet can alter the atmosphere and climate of a planet and thus its habitability. For illustrative purposes, we emphasize the differences between planets orbiting solar-type stars and late M-stars. The latter are of particular interest as they constitute the first sample of potentially habitable exoplanets accessible for surface and atmospheric characterization in the coming years.

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Star-Planet Interactions and Habitability: Radiative Effects

Cited by 5 publications

References 124 publications

A Statistical Search for Star–Planet Interaction in the Ultraviolet Using GALEX

A Statistical Search for Star–Planet Interaction in the Ultraviolet Using GALEX

Persistence of Flare-Driven Atmospheric Chemistry on Rocky Habitable Zone Worlds

Main ways in which stars influence the climate and surface habitability of their planets

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