Neptune-like planets low-density overabundance : J/MNRAS/466/1868

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Authors : Cubillos P. orcid , Erkaev N.V., Juvan I. (hide) , Erkaev N.V., Juvan I. et..al

VizieR DOI : https://doi.org/10.26093/cds/vizier.74661868
Bibcode : 2017MNRAS.466.1868C (ADS) (Simbad) (Objects)
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Data origin :

CDS Keywords : Stars, double and multiple; Exoplanets; Morphology; Mass loss
UAT : Multiple stars, Exoplanets, Galaxy classification systems, Stellar mass loss

Observation (OC)

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Inserted into VizieR : 27-Nov-2019
Last modification : 17-Aug-2024

An overabundance of low-density Neptune-like planets. (2017)

Keywords : hydrodynamics - planets and satellites atmospheres - planets and satellites: fundamental parameters

Abstract:We present a uniform analysis of the atmospheric escape rate of Neptune-like planets with estimated radius and mass (restricted to M_p_<30M_{Earth}_). For each planet, we compute the restricted Jeans escape parameter, {Lambda}, for a hydrogen atom evaluated at the planetary mass, radius, and equilibrium temperature. Values of {Lambda}<=20 suggest extremely high mass-loss rates. We identify 27 planets (out of 167) that are simultaneously consistent with hydrogen-dominated atmospheres and are expected to exhibit extreme mass-loss rates. We further estimate the mass-loss rates (L_hy_) of these planets with tailored atmospheric hydrodynamic models. We compare L_hy_ to the energy-limited (maximum-possible high-energy ...(more)
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We compiled our sample by collecting and cross-checking the lists of exoplanets from the NASA Exoplanet Archive (http://exoplanetarchive.ipac.caltech.edu), the Exoplanets Data Explorer (http://exoplanets.org, Han et al. 2014PASP..126..827H), and The Extrasolar Planets Encyclopaedia (http://exoplanet.eu, Schneider et al. 2012, ASP Conf. Ser. 461, 447). We selected the targets with measured planetary radii and masses, whose mass is less than ~2 Neptune masses (Mp<30M-{Eeath}_). We adopted stellar rotational angular velocity ({Omage}_rot_) from McQuillan, Mazeh & Aigrain (2013, Cat. J/ApJ/775/L11) and ages from Morton et al. (2016, Cat. J/ApJ/822/86). Our final sample consists of 167 planets (Table A1). 


                


                

                    

                


                

                    

                


                

                    
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