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  TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star

Addison, B. C., Wright, D. J., Nicholson, B. A., Cale, B., Mocnik, T., Huber, D., et al. (2021). TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star. Monthly Notices of the Royal Astronomical Society, 502(3), 3704-3722. doi:10.1093/mnras/staa3960.

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 Creators:
Addison, Brett C, Author
Wright, Duncan J, Author
Nicholson, Belinda A, Author
Cale, Bryson, Author
Mocnik, Teo, Author
Huber, Daniel, Author
Plavchan, Peter, Author
Wittenmyer, Robert A, Author
Vanderburg, Andrew, Author
Chaplin, William J, Author
Chontos, Ashley, Author
Clark, Jake T, Author
Eastman, Jason D, Author
Ziegler, Carl, Author
Brahm, Rafael, Author
Carter, Bradley D, Author
Clerte, Mathieu, Author
Espinoza, Néstor, Author
Horner, Jonathan, Author
Bentley, John, Author
Jordán, Andrés, AuthorKane, Stephen R, AuthorKielkopf, John F, AuthorLaychock, Emilie, AuthorMengel, Matthew W, AuthorOkumura, Jack, AuthorStassun, Keivan G, AuthorBedding, Timothy R, AuthorBowler, Brendan P, AuthorBurnelis, Andrius, AuthorBlanco-Cuaresma, Sergi, AuthorCollins, Michaela, AuthorCrossfield, Ian, AuthorDavis, Allen B, AuthorEvensberget, Dag, AuthorHeitzmann, Alexis, AuthorHowell, Steve B, AuthorLaw, Nicholas, AuthorMann, Andrew W, AuthorMarsden, Stephen C, AuthorMatson, Rachel A, AuthorO’Connor, James H, AuthorShporer, Avi, AuthorStevens, Catherine, AuthorTinney, C G, AuthorTylor, Christopher, AuthorWang, Songhu, AuthorZhang, Hui, AuthorHenning, Thomas, AuthorKossakowski, Diana, AuthorRicker, George, AuthorSarkis, Paula, AuthorSchlecker, Martin, AuthorTorres, Pascal, AuthorVanderspek, Roland, AuthorLatham, David W, AuthorSeager, Sara, AuthorWinn, Joshua N, AuthorJenkins, Jon M, AuthorMireles, Ismael, AuthorRowden, Pam, AuthorPepper, Joshua, AuthorDaylan, Tansu, AuthorSchlieder, Joshua E, AuthorCollins, Karen A, AuthorCollins, Kevin I, AuthorTan, Thiam-Guan, AuthorBall, Warrick H, AuthorBasu, Sarbani, AuthorBuzasi, Derek L, AuthorCampante, Tiago L, AuthorCorsaro, Enrico, AuthorGonzález-Cuesta, L, AuthorDavies, Guy R, Authorde Almeida, Leandro, Authordo Nascimento, Jose-Dias , AuthorGarcía, Rafael A, AuthorGuo, Zhao, AuthorHandberg, Rasmus, AuthorHekker, Saskia, AuthorHey, Daniel R, AuthorKallinger, Thomas, AuthorKawaler, Steven D, AuthorKayhan, Cenk, AuthorKuszlewicz, James S.1, Author              Lund, Mikkel N, AuthorLyttle, Alexander, AuthorMathur, Savita, AuthorMiglio, Andrea, AuthorMosser, Benoit, AuthorNielsen, Martin B, AuthorSerenelli, Aldo M, AuthorAguirre, Victor Silva, AuthorThemeßl, Nathalie1, Author               more..
Affiliations:
1Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              

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Free keywords: asteroseismology, techniques: photometric, techniques: radial velocities, techniques: spectroscopic, planetary systems, stars: individual (TIC 200723869/TOI-257)
 Abstract: We report the discovery of a warm sub-Saturn, TOI-257b (HD 19916b), based on data from NASA’s Transiting Exoplanet Survey Satellite (TESS). The transit signal was detected by TESS and confirmed to be of planetary origin based on radial velocity observations. An analysis of the TESS photometry, the Minerva-Australis, FEROS, and HARPS radial velocities, and the asteroseismic data of the stellar oscillations reveals that TOI-257b has a mass of MP = 0.138 ± 0.023 MJ (43.9 ± 7.3 M⁠), a radius of RP = 0.639 ± 0.013 RJ (7.16 ± 0.15 R⁠), bulk density of 0.65+0.12−0.11 (cgs), and period 18.38818+0.00085−0.00084 days⁠. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M* = 1.390 ± 0.046 Msun⁠, R* = 1.888 ± 0.033 Rsun⁠, Teff = 6075 ± 90 K⁠, and vsin i = 11.3 ± 0.5 km s-1. Additionally, we find hints for a second non-transiting sub-Saturn mass planet on a ∼71 day orbit using the radial velocity data. This system joins the ranks of a small number of exoplanet host stars (∼100) that have been characterized with asteroseismology. Warm sub-Saturns are rare in the known sample of exoplanets, and thus the discovery of TOI-257b is important in the context of future work studying the formation and migration history of similar planetary systems.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa3960
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 502 (3) Sequence Number: - Start / End Page: 3704 - 3722 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150