Tuesday, January 10, 2017

Kepler's Ultra-Short-Period Planets Formed Water-Poor


Author:

Lopez

Abstract:

Recent surveys have uncovered an exciting new population of ultra-short-period (USP) planets with orbital periods less than a day. These planets typically have radii <1 .5="" 2="" a="" above="" and="" are="" as="" atmospheric="" be="" bombarded="" by="" can="" commonly="" compositions.="" consequence="" consequently="" contrast="" could="" critically="" days="" dearth="" distribution="" dominated="" e="" earth="" easily="" envelopes.="" envelopes="" evaporated="" evolution="" explain="" extremely="" formed="" gaseous="" h="" have="" high-metallicity="" however="" i="" if="" in="" indicating="" intense="" is="" levels="" likely="" losing="" low-density="" models="" must="" natural="" observed="" of="" often="" on="" orbits="" out="" overall="" photo-evaporation.="" photo-ionizing="" planet="" planets="" produced="" radiation="" radii="" remnants="" retain="" rocky="" show="" size.="" stands="" sub-neptunes="" such="" that="" the="" their="" therefore="" they="" this="" to="" ultra-short-period="" understand="" using="" usp="" very="" vulnerable="" water-rich="" water="" we="" which="" with="" would="">2 Earth radii today, which is inconsistent with the observed evaporation desert, indicating that most USP planets likely formed from water-poor material within the snow-line. Finally, I examine the special case of 55 Cancri e and its possible composition in the light of recent observations, and discuss the prospects for further characterizing this population with future observations.

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