The Astronomical Journal (Jan 2023)
Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis
- Travis S. Metcalfe,
- Derek Buzasi,
- Daniel Huber,
- Marc H. Pinsonneault,
- Jennifer L. van Saders,
- Thomas R. Ayres,
- Sarbani Basu,
- Jeremy J. Drake,
- Ricky Egeland,
- Oleg Kochukhov,
- Pascal Petit,
- Steven H. Saar,
- Victor See,
- Keivan G. Stassun,
- Yaguang Li,
- Timothy R. Bedding,
- Sylvain N. Breton,
- Adam J. Finley,
- Rafael A. García,
- Hans Kjeldsen,
- Martin B. Nielsen,
- J. M. Joel Ong,
- Jakob L. Rørsted,
- Amalie Stokholm,
- Mark L. Winther,
- Catherine A. Clark,
- Diego Godoy-Rivera,
- Ilya V. Ilyin,
- Klaus G. Strassmeier,
- Sandra V. Jeffers,
- Stephen C. Marsden,
- Aline A. Vidotto,
- Sallie Baliunas,
- Willie Soon
Affiliations
- Travis S. Metcalfe
- ORCiD
- White Dwarf Research Corporation , 9020 Brumm Trail, Golden, CO 80403, USA
- Derek Buzasi
- ORCiD
- Department of Chemistry and Physics, Florida Gulf Coast University , 10501 FGCU Boulevard South, Fort Myers, FL 33965, USA
- Daniel Huber
- ORCiD
- Institute for Astronomy, University of Hawai‘i , 2680 Woodlawn Drive, Honolulu, HI 96822, USA; Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney , Camperdown, NSW 2006, Australia
- Marc H. Pinsonneault
- ORCiD
- Department of Astronomy, The Ohio State University , 140 West 18th Avenue, Columbus, OH 43210, USA
- Jennifer L. van Saders
- ORCiD
- Institute for Astronomy, University of Hawai‘i , 2680 Woodlawn Drive, Honolulu, HI 96822, USA
- Thomas R. Ayres
- ORCiD
- Center for Astrophysics and Space Astronomy, 389 UCB, University of Colorado , Boulder, CO 80309, USA
- Sarbani Basu
- ORCiD
- Department of Astronomy, Yale University , PO Box 208101, New Haven, CT 06520-8101, USA
- Jeremy J. Drake
- ORCiD
- Harvard-Smithsonian Center for Astrophysics , Cambridge, MA 02138, USA
- Ricky Egeland
- ORCiD
- White Dwarf Research Corporation , 9020 Brumm Trail, Golden, CO 80403, USA
- Oleg Kochukhov
- ORCiD
- Department of Physics and Astronomy, Uppsala University , Box 516, SE-75120 Uppsala, Sweden
- Pascal Petit
- ORCiD
- Université de Toulouse , CNRS, CNES, 14 avenue Edouard Belin, F-31400, Toulouse, France
- Steven H. Saar
- ORCiD
- Harvard-Smithsonian Center for Astrophysics , Cambridge, MA 02138, USA
- Victor See
- ORCiD
- European Space Agency (ESA), European Space Research and Technology Centre (ESTEC) , Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
- Keivan G. Stassun
- ORCiD
- Vanderbilt University , Department of Physics & Astronomy, 6301 Stevenson Center Lane, Nashville, TN 37235, USA
- Yaguang Li
- ORCiD
- Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney , Camperdown, NSW 2006, Australia
- Timothy R. Bedding
- ORCiD
- Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney , Camperdown, NSW 2006, Australia
- Sylvain N. Breton
- ORCiD
- INAF—Osservatorio Astrofisico di Catania , Via S. Sofia, 78, I-95123 Catania, Italy
- Adam J. Finley
- ORCiD
- Université Paris-Saclay, Université Paris Cité , CEA, CNRS, AIM, F-91191, Gif-sur-Yvette, France
- Rafael A. García
- ORCiD
- Université Paris-Saclay, Université Paris Cité , CEA, CNRS, AIM, F-91191, Gif-sur-Yvette, France
- Hans Kjeldsen
- ORCiD
- Stellar Astrophysics Centre, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark
- Martin B. Nielsen
- ORCiD
- School of Physics & Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT, UK
- J. M. Joel Ong
- ORCiD
- Institute for Astronomy, University of Hawai‘i , 2680 Woodlawn Drive, Honolulu, HI 96822, USA
- Jakob L. Rørsted
- ORCiD
- Stellar Astrophysics Centre, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark
- Amalie Stokholm
- ORCiD
- Stellar Astrophysics Centre, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark; Dipartimento di Fisica e Astronomia, Università degli Studi di Bologna , Via Gobetti 93/2, I-40129 Bologna, Italy; INAF—Osservatorio di Astrofisica e Scienza dello Spazio di Bologna , Via Gobetti 93/3, I-40129 Bologna, Italy
- Mark L. Winther
- ORCiD
- Stellar Astrophysics Centre, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark
- Catherine A. Clark
- ORCiD
- Jet Propulsion Laboratory, California Institute of Technology , Pasadena, CA 91109 USA; NASA Exoplanet Science Institute, IPAC, California Institute of Technology , Pasadena, CA 91125 USA
- Diego Godoy-Rivera
- ORCiD
- Instituto de Astrofísica de Canarias , E-38205 La Laguna, Tenerife, Spain; Universidad de La Laguna , Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain
- Ilya V. Ilyin
- ORCiD
- Leibniz-Institut für Astrophysik Potsdam (AIP) , An der Sternwarte 16, D-14482 Potsdam, Germany
- Klaus G. Strassmeier
- ORCiD
- Leibniz-Institut für Astrophysik Potsdam (AIP) , An der Sternwarte 16, D-14482 Potsdam, Germany
- Sandra V. Jeffers
- ORCiD
- Max-Planck-Institut für Sonnensystemforschung , Justus-von-Liebig-weg 3, D-37077, Göttingen, Germany
- Stephen C. Marsden
- ORCiD
- Centre for Astrophysics, University of Southern Queensland , Toowoomba, QLD 4350, Australia
- Aline A. Vidotto
- ORCiD
- Leiden Observatory, Leiden University , PO Box 9513, 2300 RA, Leiden, The Netherlands
- Sallie Baliunas
- Harvard-Smithsonian Center for Astrophysics , Cambridge, MA 02138, USA
- Willie Soon
- Institute of Earth Physics and Space Science (EPSS) , Sopron, Hungary; Center for Environmental Research and Earth Sciences , Salem, MA 01970, USA
- DOI
- https://doi.org/10.3847/1538-3881/acf1f7
- Journal volume & issue
-
Vol. 166,
no. 4
p. 167
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.
Keywords
