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    The Impact of Stripped Cores on the Frequency of Earth-size Planets in the Habitable Zone

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    Pascucci_2019_ApJL_883_L15.pdf
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    Author
    Pascucci, Ilaria cc
    Mulders, Gijs D.
    Lopez, Eric
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2019-09-19
    Keywords
    planets and satellites
    planets and satellites: detection
    planets and satellites: terrestrial planets
    surveys
    
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    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Ilaria Pascucci et al 2019 ApJL 883 L15
    Journal
    ASTROPHYSICAL JOURNAL LETTERS
    Rights
    Copyright © 2019. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The frequency of Earth-size planets in the habitable zone (HZ) of Sun-like stars, hereafter eta(circle plus), is a key parameter to evaluate the yield of nearby Earth analogs that can be detected and characterized by future missions. Yet, this value is poorly constrained as there are no reliable exoplanet candidates in the HZ of Sun-like stars in the Kepler field. Here, we show that extrapolations relying on the population of small (<1.8 R-circle plus), short-period (<25 days) planets bias eta(circle plus) to large values. As the radius distribution at short orbital periods is strongly affected by atmospheric loss, we reevaluate eta(circle plus) using exoplanets at larger separations. We find that eta(circle plus) drops considerably, to values of only similar to 5%-10%. Observations of young (<100 Myr) clusters can probe short-period sub-Neptunes that still retain most of their envelope mass. As such, they can be used to quantify the contamination of sub-Neptunes to the population of Kepler short-period small planets and aid in more reliable estimates of eta(circle plus).
    ISSN
    2041-8205
    DOI
    10.3847/2041-8213/ab3dac
    Version
    Final published version
    Sponsors
    National Aeronautics & Space Administration (NASA) [NNX15AD94G]; NASA's Science Mission Directorate
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/ab3dac
    Scopus Count
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    UA Faculty Publications

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      EFFECT OF SURFACE-MANTLE WATER EXCHANGE PARAMETERIZATIONS ON EXOPLANET OCEAN DEPTHS

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