Planetary Parameters, XUV Environments, and Mass-loss Rates for Nearby Gaseous Planets with X-Ray-detected Host Stars

Author:

Spinelli Riccardo,Gallo ElenaORCID,Haardt FrancescoORCID,Caldiroli Andrea,Biassoni Federico,Borsa FrancescoORCID,Rauscher EmilyORCID

Abstract

Abstract We leverage Gaia DR2 parallactic distances to deliver new or revised estimates of planetary parameters and X-ray irradiation for a distance-limited (≲100 pc) sample of 27 gaseous planets (from super-Earths to hot Jupiters) with publicly available Chandra and/or XMM observations, for which we carry out a homogeneous data reduction. For 20 planets with X-ray-detected host stars we make use of the photoionization hydrodynamics code ATES to derive updated atmospheric mass outflow rates. The newly derived masses/radii are not consistent with the exoplanet.eu values for five systems: HD 149026b and WASP-38, for mass, and Au Mic b, HAT-P-20, and HAT-P-2 for radii. Notably, the lower mass implies a (Saturn-like) density of 0.86 ± 0.09 g cm−3 for HD 149026b. This independent estimate is consistent with the lowest values reported in the literature. Separately, we report on the X-ray detection of GJ 9827, HD 219134, and LHS 1140 for the first time. The inferred stellar X-ray luminosity of LHS 1140 ( 1.34 0.21 + 0.19 × 10 26 erg s−1) implies that LHS 1140 b is the least irradiated transiting super-Earth known to orbit within the habitable zone of a nearby M dwarf.

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. ExoplANETS-A: A virtual observatory database for host stars and planetary systems;Astronomy & Astrophysics;2024-08

2. Exoplanet Aeronomy: A Case Study of WASP-69 b’s Variable Thermosphere;The Astronomical Journal;2024-07-09

3. The time evolution of the ultraviolet habitable zone;Monthly Notices of the Royal Astronomical Society: Letters;2024-06-14

4. The GAPS Programme at TNG;Astronomy & Astrophysics;2024-06

5. A reanalysis of the LHS 1140 b atmosphere observed with the Hubble Space Telescope;Monthly Notices of the Royal Astronomical Society;2024-03-23

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