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The strongly irradiated planets in Praesepe
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King, George W., Wheatley, Peter J., Fawcett, Victoria A., Miller, Nicola J., Corrales, Lía R. and Agüeros, Marcel A. (2022) The strongly irradiated planets in Praesepe. Monthly Notices of the Royal Astronomical Society, 512 (1). pp. 41-55. doi:10.1093/mnras/stac437 ISSN 1365-2966.
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WRAP-strongly-irradiated-planets-Praesepe-2022.pdf - Accepted Version - Requires a PDF viewer. Download (1563Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stac437
Abstract
We present an analysis of XMM-Newton observations of four stars in the young (670 Myr) open cluster Praesepe. The planets hosted by these stars all lie close in radius-period space to the radius-period valley and/or the Neptunian desert, two features that photoevaporation by X-ray and extreme ultraviolet (EUV) photons could be driving. Although the stars are no longer in the saturated regime, strong X-ray and extreme ultraviolet irradiation is still ongoing. Based on EUV time evolution slopes we derived in a previous paper, in all four cases, two-thirds of their EUV irradiation is still to come. We compare the XMM-Newton light curves to those simultaneously measured with K2 at optical wavelengths, allowing us to search for correlated variability between the X-ray and optical light curves. We find that the X-ray flux decreases and flattens off while the optical flux rises throughout for K2-100, something that could result from active regions disappearing from view as the star spins. Finally, we also investigate possible futures for the four planets in our sample with simulations of their atmosphere evolution still to come, finding that complete photoevaporative stripping of the envelope of three of the four planets is possible, depending on the current planet masses.
Item Type: | Journal Article | ||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Extrasolar planets -- Atmospheres, Solar x-rays, Ultraviolet radiation, Photoionization of gases, Stars -- Open clusters | ||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||
Publisher: | Oxford University Press | ||||||||||||||||||
ISSN: | 1365-2966 | ||||||||||||||||||
Official Date: | May 2022 | ||||||||||||||||||
Dates: |
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Volume: | 512 | ||||||||||||||||||
Number: | 1 | ||||||||||||||||||
Page Range: | pp. 41-55 | ||||||||||||||||||
DOI: | 10.1093/mnras/stac437 | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | ||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||
Date of first compliant deposit: | 6 May 2022 | ||||||||||||||||||
Date of first compliant Open Access: | 6 May 2022 | ||||||||||||||||||
RIOXX Funder/Project Grant: |
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