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Improved Constraints for the XUV Luminosity Evolution of Trappist-1We re-examine the XUV luminosity evolution of TRAPPIST-1 utilizing new observational constraints of the current stellar parameters (XUV and bolometric luminosity) from multi-epoch X-ray/UV photometry. Following the formalism presented on Fleming et al. (2020), we infer that TRAPPIST-1maintained a saturated XUV luminosity, relative to the bolometric luminosity, of log10(LXUV/Lbol)=−3.03+0.25−0.23at early times for a period of tsat= 3.14+2.22−1.46Gyr. After the saturation phase, we find LXUV decayed over time by an exponential rate ofβXUV=−1.17+0.27−0.28. Compared to our inferred age of the system, age = 7.96+1.78−1.87Gyr, our result for tsat suggests that there is only a∼4% chance thatTRAPPIST-1 still remains in the saturated phase today, which is significantly lower than the previous estimate of 40%. Despite this reduction in tsat, our results remain consistent in the conclusion that the TRAPPIST-1 planets likely received an extreme amount XUV energy—an estimated integrated XUV energy of∼1030−1032erg over the star’s lifetime—that is∼15% lower than the original result.
Document ID
20220004109
Acquisition Source
2230 Support
Document Type
Accepted Manuscript (Version with final changes)
Authors
Jessica Birky ORCID
(University of Washington Seattle, Washington, United States)
Rory Barnes ORCID
(University of Washington Seattle, Washington, United States)
David P. Fleming ORCID
(University of Washington Seattle, Washington, United States)
Date Acquired
March 9, 2022
Publication Date
May 1, 2021
Publication Information
Publication: Research Notes of the American Astronomical Society
Publisher: American Astronomical Society
Volume: 5
Issue: 5
Issue Publication Date: May 1, 2021
e-ISSN: 2515-5172
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: 80NSSC20K0229
CONTRACT_GRANT: 80NSSC18K0829
CONTRACT_GRANT: DGE-1762114
CONTRACT_GRANT: DGE-1762114
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.
Technical Review
Keywords
Stellar evolution
Low mass stars
Planet hosting stars
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