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Title: CoRoT-7b: SUPER-EARTH OR SUPER-Io?

Abstract

CoRoT-7b, a planet about 70% larger than the Earth orbiting a Sun-like star, is the first-discovered rocky exoplanet, and hence has been dubbed a 'super-Earth'. Some initial studies suggested that since the planet is so close to its host star, it receives enough insolation to partially melt its surface. However, these past studies failed to take into consideration the role that tides may play in this system. Even if the planet's eccentricity has always been zero, we show that tidal decay of the semimajor axis could have been large enough that the planet formed on a wider orbit which received less insolation. Moreover, CoRoT-7b could be tidally heated at a rate that dominates its geophysics and drives extreme volcanism. In this case, CoRoT-7b is a 'super-Io' that, like Jupiter's volcanic moon, is dominated by volcanism and rapid resurfacing. Such heating could occur with an eccentricity of just 10{sup -5}. This small value could be driven by CoRoT-7c if its own eccentricity is larger than {approx}10{sup -4}. CoRoT-7b may be the first of a class of planetary super-Ios likely to be revealed by the CoRoT and Kepler spacecraft.

Authors:
;  [1];  [2];  [3];  [4]
  1. Department of Astronomy, University of Washington, Seattle, WA 98195-1580 (United States)
  2. Center for Astrophysics and Space Astronomy, University of Colorado, UCB 389, Boulder, CO 80309-0389 (United States)
  3. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 (United States)
  4. Planetary Systems Laboratory, Goddard Space Flight Center, Code 693, Greenbelt, MD 20771 (United States)
Publication Date:
OSTI Identifier:
21301373
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 709; Journal Issue: 2; Other Information: DOI: 10.1088/2041-8205/709/2/L95; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; GEOPHYSICS; JUPITER PLANET; MOON; ORBITS; SUN; VOLCANISM

Citation Formats

Barnes, Rory, Kaib, Nathan A., Raymond, Sean N., Greenberg, Richard, and Jackson, Brian. CoRoT-7b: SUPER-EARTH OR SUPER-Io?. United States: N. p., 2010. Web. doi:10.1088/2041-8205/709/2/L95; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Barnes, Rory, Kaib, Nathan A., Raymond, Sean N., Greenberg, Richard, & Jackson, Brian. CoRoT-7b: SUPER-EARTH OR SUPER-Io?. United States. doi:10.1088/2041-8205/709/2/L95; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Barnes, Rory, Kaib, Nathan A., Raymond, Sean N., Greenberg, Richard, and Jackson, Brian. Mon . "CoRoT-7b: SUPER-EARTH OR SUPER-Io?". United States. doi:10.1088/2041-8205/709/2/L95; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21301373,
title = {CoRoT-7b: SUPER-EARTH OR SUPER-Io?},
author = {Barnes, Rory and Kaib, Nathan A. and Raymond, Sean N. and Greenberg, Richard and Jackson, Brian},
abstractNote = {CoRoT-7b, a planet about 70% larger than the Earth orbiting a Sun-like star, is the first-discovered rocky exoplanet, and hence has been dubbed a 'super-Earth'. Some initial studies suggested that since the planet is so close to its host star, it receives enough insolation to partially melt its surface. However, these past studies failed to take into consideration the role that tides may play in this system. Even if the planet's eccentricity has always been zero, we show that tidal decay of the semimajor axis could have been large enough that the planet formed on a wider orbit which received less insolation. Moreover, CoRoT-7b could be tidally heated at a rate that dominates its geophysics and drives extreme volcanism. In this case, CoRoT-7b is a 'super-Io' that, like Jupiter's volcanic moon, is dominated by volcanism and rapid resurfacing. Such heating could occur with an eccentricity of just 10{sup -5}. This small value could be driven by CoRoT-7c if its own eccentricity is larger than {approx}10{sup -4}. CoRoT-7b may be the first of a class of planetary super-Ios likely to be revealed by the CoRoT and Kepler spacecraft.},
doi = {10.1088/2041-8205/709/2/L95; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 709,
place = {United States},
year = {Mon Feb 01 00:00:00 EST 2010},
month = {Mon Feb 01 00:00:00 EST 2010}
}