Indexing of exoplanets in search for potential habitability: application to Mars-like worlds
- Title
- Indexing of exoplanets in search for potential habitability: application to Mars-like worlds
- Creator
- Kashyap Jagadeesh M.; Gudennavar S.B.; Doshi U.; Safonova M.
- Description
- Study of exoplanets is one of the main goals of present research in planetary sciences and astrobiology. Analysis of huge planetary data from space missions such as CoRoT and Kepler is directed ultimately at finding a planet similar to Earththe Earths twin, and answering the question of potential exo-habitability. The Earth Similarity Index (ESI) is a first step in this quest, ranging from1 (Earth) to0 (totally dissimilar to Earth). It was defined for the four physical parameters of a planet: radius, density, escape velocity and surface temperature. The ESI is further sub-divided into interior ESI (geometrical mean of radius and density) and surface ESI (geometrical mean of escape velocity and surface temperature). The challenge here is to determine which exoplanet parameter(s) is important in finding this similarity; how exactly the individual parameters entering the interior ESI and surface ESI are contributing to the global ESI. Since the surface temperature entering surface ESI is a non-observable quantity, it is difficult to determine its value. Using the known data for the Solar System objects, we established the calibration relation between surface and equilibrium temperatures to devise an effective way to estimate the value of the surface temperature of exoplanets. ESI is a first step in determining potential exo-habitability that may not be very similar to a terrestrial life. A new approach, called Mars Similarity Index (MSI), is introduced to identify planets that may be habitable to the extreme forms of life. MSI is defined in the range between 1 (present Mars) and 0 (dissimilar to present Mars) and uses the same physical parameters as ESI. We are interested in Mars-like planets to search for planets that may host the extreme life forms, such as the ones living in extreme environments on Earth; for example, methane on Mars may be a product of the methane-specific extremophile life form metabolism. 2017, Springer Science+Business Media B.V.
- Source
- Astrophysics and Space Science, Vol-362, No. 8
- Date
- 2017-01-01
- Publisher
- Springer Netherlands
- Subject
- Astrobiology; Earth-like planets; Habitability
- Coverage
- Kashyap Jagadeesh M., Department of Physics, Christ University, Bengaluru, 560 029, India; Gudennavar S.B., Department of Physics, Christ University, Bengaluru, 560 029, India; Doshi U., M.P. Birla Institute of Fundamental Research, Bangalore, 560 001, India; Safonova M., M.P. Birla Institute of Fundamental Research, Bangalore, 560 001, India
- Rights
- Restricted Access
- Relation
- ISSN: 0004640X
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Kashyap Jagadeesh M.; Gudennavar S.B.; Doshi U.; Safonova M., “Indexing of exoplanets in search for potential habitability: application to Mars-like worlds,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 24, 2025, https://archives.christuniversity.in/items/show/17010.