Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis

Metcalfe, Travis S. and Buzasi, Derek and Huber, Daniel and Pinsonneault, Marc H. and van Saders, Jennifer L. and Ayres, Thomas R. and Basu, Sarbani and Drake, Jeremy J. and Egeland, Ricky and Kochukhov, Oleg and Petit, Pascal and Saar, Steven H. and See, Victor and Stassun, Keivan G. and Li, Yaguang and Bedding, Timothy R. and Breton, Sylvain N. and Finley, Adam J. and García, Rafael A. and Kjeldsen, Hans and Nielsen, Martin B. and Ong, J. M. Joel and Rørsted, Jakob L. and Stokholm, Amalie and Winther, Mark L. and Clark, Catherine A. and Godoy-Rivera, Diego and Ilyin, Ilya V. and Strassmeier, Klaus G. and Jeffers, Sandra V. and Marsden, Stephen C. and Vidotto, Aline A. and Baliunas, Sallie and Soon, Willie (2023) Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis. The Astronomical Journal, 166 (4). p. 167. ISSN 0004-6256

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Abstract

The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and surface differential rotation very similar to the Sun. We aim to characterize the fundamental properties of this system and constrain the evolutionary pathway that led to its present configuration. We detect solar-like oscillations in time series photometry from the Transiting Exoplanet Survey Satellite, and we derive precise asteroseismic properties from detailed modeling. We obtain new spectropolarimetric data, and we use them to reconstruct the large-scale magnetic field morphology. We reanalyze the complete time series of chromospheric activity measurements from the Mount Wilson Observatory, and we present new X-ray and ultraviolet observations from the Chandra and Hubble space telescopes. Finally, we use the updated observational constraints to assess the rotational history of the star and estimate the wind braking torque. We conclude that the remaining uncertainty on the stellar age currently prevents an unambiguous interpretation of the properties of λ Ser, and that the rate of angular momentum loss appears to be higher than for other stars with a similar Rossby number. Future asteroseismic observations may help to improve the precision of the stellar age.

Item Type: Article
Subjects: Oalibrary Press > Physics and Astronomy
Depositing User: Managing Editor
Date Deposited: 14 Nov 2023 06:10
Last Modified: 14 Nov 2023 06:10
URI: http://asian.go4publish.com/id/eprint/3224

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