Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-23T02:15:14.506Z Has data issue: false hasContentIssue false
  • English
  • Français

Characterization of stellar activity using transits and its impact on habitability

Published online by Cambridge University Press:  24 September 2020

Raissa Estrela Open the ORCID record for Raissa Estrela [Opens in a new window] ,
Adriana Valio Open the ORCID record for Adriana Valio [Opens in a new window]  and
Sourav Palit
Raissa Estrela
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr, Pasadena, CA 91109 email: [email protected] Center for Radioastronomy and Astrophysics Mackenzie, Mackenzie Presbyterian University Rua da Consolacao 896, Sao Paulo, SP 01302-907, Brazil email: [email protected]
Adriana Valio
Affiliation:
Center for Radioastronomy and Astrophysics Mackenzie, Mackenzie Presbyterian University Rua da Consolacao 896, Sao Paulo, SP 01302-907, Brazil email: [email protected]
Sourav Palit
Affiliation:
Department of Physics, Indian Institute of Technology, Bombay, Powai, Mumbai400076
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Stellar magnetic field is the driver of activity in stars and can trigger spots, energetic flares, coronal plasma ejections and ionized winds. These phenomena play a crucial role in understanding the internal mechanisms of the star, but can also have potential effects in orbiting planets. During the transit of a planet, spots can be occulted producing features imprinted in the transit light curve. Here, we modelled these features to characterize the physical properties of the spots (radius, intensity, and location). In addition, we monitor spots signatures on multiple transits to estimate magnetic cycles length of Kepler stars. Flares have also been observed during transits in active stars. We derive the properties of the flares and analyse their UV impact on possible living organisms in planets orbiting in the habitable zone.

Keywords

stars: flarestars: activity, astrobiologyultraviolet: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 461 - 466
Copyright
© International Astronomical Union 2020

References

Airapetian, V. S., Glocer, A., Khazanov, G. V., et al. 2017, ApjL, 836, L3CrossRefGoogle Scholar
Estrela, R. & Valio, A. 2016, ApJ, 831, 57CrossRefGoogle Scholar
Estrela, R. & Valio, A. 2018, Astrobiology, 18, 1414–1424CrossRefGoogle Scholar
Maehara, H., Shibayama, T., Notsu, Y., et al. 2015, Earth, Planets, and Space, 67, 59CrossRefGoogle Scholar
McIntosh, S. W., Leamon, R. J., Krista, L. D., et al. 2015, Nature Communications, 6, 6491Google Scholar
Hawley, S. L. & Pettersen, B. R. 1991, ApJ, 378, 725CrossRefGoogle Scholar
Ranjan, S., Wordsworth, R., & Sasselov, D. D. 2017, ApJ, 843, 110CrossRefGoogle Scholar
Segura, A., Walkowicz, L.M., Meadows, V., Kasting, J., & Hawley, S. 2010, Astrobiology, 10, 751–771CrossRefGoogle Scholar
Tilley, M. A., Segura, A., Meadows, V., et al. 2019, Astrobiology, 19, 64CrossRefGoogle Scholar
Vida, K, Kovari, Zs., Pal, A., K. Olah, K, & Kriskovics, L. 2017, ApJ, 841, 124–129CrossRefGoogle Scholar
Venot, O., Rocchetto, M., Carl, S., et al. 2016, ApJ, 830, 77CrossRefGoogle Scholar
Woods, T. N. & Rottman, G. 2005, Solar Physics, 230, 375CrossRefGoogle Scholar
Woods, T. N., Eparvier, F. G., Fontenla, J. et al. 2004, Geophysical Research Letters, 31, L10802CrossRefGoogle Scholar