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HD 207897 b : a dense sub-Neptune transiting a nearby and bright K-type star

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Heidari, N., Boisse, I., Orell-Miquel, J., Hebrard, G., Acuna, L., Hara, N. C., Lillo-Box, J., Eastman, J. D., Arnold, L., Astudillo-Defru, N. et al.
(2022) HD 207897 b : a dense sub-Neptune transiting a nearby and bright K-type star. Astronomy & Astrophysics, 658 . A176. doi:10.1051/0004-6361/202141429 ISSN 0004-6361.

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Official URL: http://dx.doi.org/10.1051/0004-6361/202141429

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Abstract

We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm−3 or 5.5−0.7+0.8 g cm−3, making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Neptune (Planet) , Extrasolar planets , Extrasolar planets -- Detection , K stars -- Motion in line of sight , Planetary systems
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: 18 February 2022
Dates:
DateEvent
18 February 2022Published
8 September 2021Accepted
29 May 2021Submitted
Volume: 658
Number of Pages: 17
Article Number: A176
DOI: 10.1051/0004-6361/202141429
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 28 March 2022
Date of first compliant Open Access: 29 March 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIED[CNRS] Centre National de la Recherche Scientifiquehttp://dx.doi.org/10.13039/501100004794
UNSPECIFIEDAmbassade de France en Iranhttps://ir.ambafrance.org/-Francais-
100010434“la Caixa” FoundationUNSPECIFIED
847648Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
LCF/BQ/PI20/11760023H2020 Marie Skłodowska-Curie Actionshttp://dx.doi.org/10.13039/100010665
UNSPECIFIED[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
947634 (SPICE DUNE)Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
UID/FIS/04434/2019[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
UIDP/04434/2020[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
UIDB/04434/2020[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
PTDC/FIS-AST/32113/2017[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
POCI-01-0145-FEDER-032113[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
PTDC/FIS-AST/28953/2017 [ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
POCI-01-0145-FEDER-028953[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
F/00650/2015/CP1273/CT0001Fundacao para a Ciencia e TecnologiaUNSPECIFIED
F/00849/2015/CP1273/CT0003Fundacao para a Ciencia e TecnologiaUNSPECIFIED
F/00169/2012/CP0150/CT0002Fundacao para a Ciencia e TecnologiaUNSPECIFIED
F/00028/2014/CP1215/CT0002Fundacao para a Ciencia e TecnologiaUNSPECIFIED
COMPETE[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
DL 57/2016/CP1364/CT0004Fundacao para a Ciencia e TecnologiaUNSPECIFIED
ANR-18-CE31-0019 (SPlaSH)[ANR] Agence Nationale de la Recherchehttp://dx.doi.org/10.13039/501100001665
3180063[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
837319Centre National d’Etudes SpatialesUNSPECIFIED
ANR-15-IDEX-02[ANR] Agence Nationale de la Recherchehttp://dx.doi.org/10.13039/501100001665
DL 57/2016/CP1364/CT0004Fundacao para a Ciencia e TecnologiaUNSPECIFIED
80NS SC19K1727 (TESS)[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
18 − 2XRP182 − 0136[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
UNSPECIFIEDMIT Kavli Institute for Astrophysics and Space Researchhttp://viaf.org/viaf/4619159279145808160000
80NSSC19K0379Alfred P. Sloan Foundationhttp://dx.doi.org/10.13039/100000879
Beatrice Watson Parrent FellowshipUniversity of Hawaii at Manoa. Institute for Astronomyhttp://viaf.org/viaf/154821528
80NSSC19K0597[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
DGE 1842402[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
80NSSC19K0379[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
80NSSC19K0379[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
AST-1824644[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
AST-1903811[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
DGE 1745301[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
Hellman Family Faculty FundHellman Foundationhttp://dx.doi.org/10.13039/100010336
UNSPECIFIEDDavid and Lucile Packard Foundationhttp://dx.doi.org/10.13039/100000008
80NSSC18K1583[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
DGE-1842400[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
1829740[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
UNSPECIFIEDBrinson Foundationhttp://dx.doi.org/10.13039/100001008
UNSPECIFIEDHenry Moore Foundationhttp://dx.doi.org/10.13039/100012062

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