The strongly irradiated planets in Praesepe

• DOI: 10.1093/mnras/stac437
• Publication Date: 2022-02-15T20:21:53Z
• Authors: George W King; Peter J Wheatley; Victoria A Fawcett; Nicola J Miller; Lía R Corrales; Marcel A Agüeros
• Keywords: Photoevaporation; Extreme ultraviolet; Extreme Ultraviolet Lithography; Flare

ABSTRACT We present an analysis of XMM–Newton observations four stars in the young (670 Myr) open cluster Praesepe. The planets hosted by these all lie close radius–period space to valley and/or Neptunian desert, two features that photoevaporation X-ray and extreme ultraviolet (EUV) photons could be driving. Although are no longer saturated regime, strong irradiation is still ongoing. Based on EUV time evolution slopes, we derived a previous paper, cases, two-thirds their come. compare light curves those simultaneously measured with K2 at optical wavelengths, allowing us search for correlated variability between curves. find flux decreases flattens off while rises throughout K2-100, something result from active regions disappearing view as star spins. Finally, also investigate possible futures our sample simulations atmosphere come, finding complete photoevaporative stripping envelope three possible, depending current planet masses.