Abstract Details
| Name: Mayank Narang Affiliation: Tata Institute Of Fundamental Research Conference ID: ASI2018_1101 Title : Are Exoplanet properties determined by the host star? Authors and Co-Authors : Manoj Puravankara TIFR Mumbai, Blesson Mathew Christ College Bangalore, Ravinder Banyal IIA Bangalore, Sivarani Thirupathi IIA Bangalore Abstract Type : Contributed Talk Abstract Category : Stars,ISM and the Galaxy Abstract : The short answer is yes. With the latest Kepler Data release DR25 we now have the largest sample of exoplanet candidates with uniformly determined  stellar and planetary properties. Using detailed mathematical prescriptions, we present  an unbiased view of the population of planets in the Kepler field. Since we account for all the observational biases and selection effects while calculating the occurrence rate of planets, our results must represent the true demographic of the planets and their correlations with the host star properties. In this study, we examine planets orbiting  main sequence stars with orbital periods  less than an year. We studied various correlations between the observed properties of the planets (radius, mass & orbital period) and their host stars properties (Teff & metallicity). We show  that the radius (or mass) of the exoplanet is tightly correlated with the  spectral type of the host star and, therefore, with the mass of the host star : the more massive the star the higher the occurrence rate of giant planets around them; conversely, the occurence rate of small planets is higher around low mass stars..  We also examine the relationship between planet radius or mass and the metallicity of the host star. We find that the metallicity of the host star increases as the radius or mass of the planets increases. Interestingly, for planets with radius greater than 17 R_Earth  (or mass greater than 4.4 M_Jupiter)  the trend is reversed: host star metallicity drops with increasing planetary radius or planetary mass. We  will discuss these results in the context of star and  planet formation theories. |