Stellar X-ray activity and habitability revealed by ROSAT sky survey

Abstract

Using the homogeneous X-ray catalog from ROSAT observations, we conducted a comprehensive investigation into stellar X-ray activity-rotation relations for both single and binary stars. Generally, the relation for single stars consists of two distinct regions: a weak decay region, indicating a continued dependence of the magnetic dynamo on stellar rotation rather than a saturation regime with constant activity, and a rapid decay region, where X-ray activity is strongly correlated with the Rossby number. Detailed analysis reveals more fine structures within the relation: in the extremely fast rotating regime, a decrease in X-ray activity was observed with increasing rotation rate, referred to as super-saturation, while in the extremely slow rotating region, the relation flattens, mainly due to the scattering of F stars. This scattering may result from intrinsic variability in stellar activities over one stellar cycle or the presence of different dynamo mechanisms. Binaries exhibit a similar relation to that of single stars while the limited sample size prevented the identification of fine structures in the relation for binaries. We calculated the mass loss rates of planetary atmosphere triggered by X-ray emissions from host stars. Our findings indicate that for an Earth-like planet within the stellar habitable zone, it would easily lose its entire primordial H/He envelope (equating to about 1% of the planetary mass).

17 pages, 12 figures, ApJS accepted

References in corpus (37)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• Atmospheric Escape from Hot Jupiters
• Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
• Second ROSAT all-sky survey (2RXS) source catalogue
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Roche lobe effects on the atmospheric loss of "Hot Jupiters"
• The Catalina Surveys Periodic Variable Star Catalog
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties
• The H$\alpha$ emission of nearby M dwarfs and its relation to stellar rotation
• The Zwicky Transient Facility Catalog of Periodic Variable Stars
• The active lives of stars: a complete description of rotation and XUV evolution of F, G, K, and M dwarfs
• Generalized investigation of the rotation-activity relation: Favouring rotation period instead of Rossby number
• TESS Eclipsing Binary Stars. I. Short cadence observations of 4584 eclipsing binaries in Sectors 1-26
• Surface rotation and photometric activity for Kepler targets. II. G and F main-sequence stars, and cool subgiant stars
• XUV-driven mass loss from extrasolar giant planets orbiting active stars
• UV habitable zones around M stars
• The gas-to-extinction ratio and the gas distribution in the Galaxy
• Gaia Data Release 3: All-sky classification of 12.4 million variable sources into 25 classes
• GLADE+: An Extended Galaxy Catalogue for Multimessenger Searches with Advanced Gravitational-wave Detectors
• Identification of Young Stellar Object candidates in the $Gaia$ DR2 x AllWISE catalogue with machine learning methods
• Detection of an Atmosphere on a Rocky Exoplanet
• Coupling thermal evolution of planets and hydrodynamic atmospheric escape in MESA
• Double-, triple-line spectroscopic candidates in the LAMOST Medium-Resolution Spectroscopic Survey
• The Spectroscopic Binaries from LAMOST Medium-Resolution Survey (MRS). I. Searching for Double-lined Spectroscopic Binaries (SB2s) with Convolutional Neural Network
• Gaia Data Release 3 Validating the classification of variable Young Stellar Object candidates
• Common dynamo scaling in slowly rotating young and evolved stars
• Detection of 2460 SB2 candidates in the LAMOST-MRS, using projected rotational velocities and a binary spectral model
• Stellar X-ray activity across the Hertzsprung-Russell diagram. I. Catalogs
• The white dwarf binary pathways survey V. The Gaia white dwarf plus AFGK binary sample and the identification of 23 close binaries
• The ultraviolet habitable zone of exoplanets
• HAZMAT. IX. An Analysis of the UV and X-Ray Evolution of Low-Mass Stars in the Era of Gaia
• Citizen ASAS-SN Data Release I: Variable Star Classification Using Citizen Science
• Statistics of BY Draconis Chromospheric Variable Stars
• Stellar chromospheric activities revealed from the LAMOST-K2 time-domain survey
• Estimations and scaling laws for stellar magnetic fields

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