Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS

David J. Armstrong; Ares Osborn; Vardan Adibekyan; Elisa Delgado-Mena; Saeed Hojjatpanah; Steve B. Howell; Sergio Hoyer; Henrik Knierim; Sergio G. Sousa; Keivan G. Stassun; Dimitri Veras; David R. Anderson; Daniel Bayliss; François Bouchy; Christopher J. Burke; Jessie L. Christiansen; Xavier Dumusque; Marcelo Aron Fetzner Keniger; Andreas Hadjigeorghiou; Faith Hawthorn; Ravit Helled; Jon M. Jenkins; David W. Latham; Jorge Lillo-Box; Louise D. Nielsen; Hugh P. Osborn; Jose Rodrigues; David Rodriguez; Nuno C. Santos; Sara Seager; Paul A. Strøm; Guillermo Torres; Joseph D. Twicken; Stephane Udry; Peter J. Wheatley; Joshua N. Winn

doi:10.1093/mnras/stad2183

Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS

David J. Armstrong, Ares Osborn, Vardan Adibekyan, Elisa Delgado-Mena, Saeed Hojjatpanah, Steve B. Howell, Sergio Hoyer, Henrik Knierim, Sergio G. Sousa, Keivan G. Stassun, Dimitri Veras, David R. Anderson, Daniel Bayliss, François Bouchy, Christopher J. Burke, Jessie L. Christiansen, Xavier Dumusque, Marcelo Aron Fetzner Keniger, Andreas Hadjigeorghiou, Faith HawthornRavit Helled, Jon M. Jenkins, David W. Latham, Jorge Lillo-Box, Louise D. Nielsen, Hugh P. Osborn, Jose Rodrigues, David Rodriguez, Nuno C. Santos, Sara Seager, Paul A. Strøm, Guillermo Torres, Joseph D. Twicken, Stephane Udry, Peter J. Wheatley, Joshua N. Winn

Astrophysical Sciences

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We report the discovery of two exoplanets orbiting around HD 212729 (TOI 1052, TIC 317060587), a Teff = 6146 K star with V = 9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass and transits the star, and an additional planet TOI-1052c is observed in radial velocities but not seen to transit. We confirm the planetary nature of TOI-1052b using precise radial velocity observations from HARPS and determined its parameters in a joint RV and photometry analysis. TOI-1052b has a radius of R⊙, a mass of 16.9 ± 1.7 M⊙, and an orbital period of 9.14 d. TOI-1052c does not show any transits in the TESS data, and has a minimum mass of M⊙ and an orbital period of 35.8 d, placing it just interior to the 4:1 mean-motion resonance. Both planets are best fit by relatively high but only marginally significant eccentricities of for planet b and for planet c. We perform a dynamical analysis and internal structure model of the planets as well as deriving stellar parameters and chemical abundances. The mean density of TOI-1052b is g cm-3 consistent with an internal structure similar to Neptune. A nearby star is observed in Gaia DR3 with the same distance and proper motion as TOI-1052, at a sky projected separation of 1500 au, making this a potential wide binary star system.

Original language	English (US)
Pages (from-to)	5804-5816
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	524
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stad2183
State	Published - Oct 1 2023

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planets and satellites: detection
planets and satellites: individual: (TOI-1052, TIC 317060587)

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10.1093/mnras/stad2183

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Armstrong, D. J., Osborn, A., Adibekyan, V., Delgado-Mena, E., Hojjatpanah, S., Howell, S. B., Hoyer, S., Knierim, H., Sousa, S. G., Stassun, K. G., Veras, D., Anderson, D. R., Bayliss, D., Bouchy, F., Burke, C. J., Christiansen, J. L., Dumusque, X., Keniger, M. A. F., Hadjigeorghiou, A., ... Winn, J. N. (2023). Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS. Monthly Notices of the Royal Astronomical Society, 524(4), 5804-5816. https://doi.org/10.1093/mnras/stad2183

@article{747f2c42dbb54e58a82ede292727e3b1,

title = "Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS",

abstract = "We report the discovery of two exoplanets orbiting around HD 212729 (TOI 1052, TIC 317060587), a Teff = 6146 K star with V = 9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass and transits the star, and an additional planet TOI-1052c is observed in radial velocities but not seen to transit. We confirm the planetary nature of TOI-1052b using precise radial velocity observations from HARPS and determined its parameters in a joint RV and photometry analysis. TOI-1052b has a radius of R⊙, a mass of 16.9 ± 1.7 M⊙, and an orbital period of 9.14 d. TOI-1052c does not show any transits in the TESS data, and has a minimum mass of M⊙ and an orbital period of 35.8 d, placing it just interior to the 4:1 mean-motion resonance. Both planets are best fit by relatively high but only marginally significant eccentricities of for planet b and for planet c. We perform a dynamical analysis and internal structure model of the planets as well as deriving stellar parameters and chemical abundances. The mean density of TOI-1052b is g cm-3 consistent with an internal structure similar to Neptune. A nearby star is observed in Gaia DR3 with the same distance and proper motion as TOI-1052, at a sky projected separation of 1500 au, making this a potential wide binary star system.",

keywords = "planets and satellites: detection, planets and satellites: individual: (TOI-1052, TIC 317060587)",

author = "Armstrong, {David J.} and Ares Osborn and Vardan Adibekyan and Elisa Delgado-Mena and Saeed Hojjatpanah and Howell, {Steve B.} and Sergio Hoyer and Henrik Knierim and Sousa, {Sergio G.} and Stassun, {Keivan G.} and Dimitri Veras and Anderson, {David R.} and Daniel Bayliss and Fran{\c c}ois Bouchy and Burke, {Christopher J.} and Christiansen, {Jessie L.} and Xavier Dumusque and Keniger, {Marcelo Aron Fetzner} and Andreas Hadjigeorghiou and Faith Hawthorn and Ravit Helled and Jenkins, {Jon M.} and Latham, {David W.} and Jorge Lillo-Box and Nielsen, {Louise D.} and Osborn, {Hugh P.} and Jose Rodrigues and David Rodriguez and Santos, {Nuno C.} and Sara Seager and Str{\o}m, {Paul A.} and Guillermo Torres and Twicken, {Joseph D.} and Stephane Udry and Wheatley, {Peter J.} and Winn, {Joshua N.}",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.",

year = "2023",

month = oct,

day = "1",

doi = "10.1093/mnras/stad2183",

language = "English (US)",

volume = "524",

pages = "5804--5816",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

Armstrong, DJ, Osborn, A, Adibekyan, V, Delgado-Mena, E, Hojjatpanah, S, Howell, SB, Hoyer, S, Knierim, H, Sousa, SG, Stassun, KG, Veras, D, Anderson, DR, Bayliss, D, Bouchy, F, Burke, CJ, Christiansen, JL, Dumusque, X, Keniger, MAF, Hadjigeorghiou, A, Hawthorn, F, Helled, R, Jenkins, JM, Latham, DW, Lillo-Box, J, Nielsen, LD, Osborn, HP, Rodrigues, J, Rodriguez, D, Santos, NC, Seager, S, Strøm, PA, Torres, G, Twicken, JD, Udry, S, Wheatley, PJ & Winn, JN 2023, 'Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS', Monthly Notices of the Royal Astronomical Society, vol. 524, no. 4, pp. 5804-5816. https://doi.org/10.1093/mnras/stad2183

TY - JOUR

T1 - Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS

AU - Armstrong, David J.

AU - Osborn, Ares

AU - Adibekyan, Vardan

AU - Delgado-Mena, Elisa

AU - Hojjatpanah, Saeed

AU - Howell, Steve B.

AU - Hoyer, Sergio

AU - Knierim, Henrik

AU - Sousa, Sergio G.

AU - Stassun, Keivan G.

AU - Veras, Dimitri

AU - Anderson, David R.

AU - Bayliss, Daniel

AU - Bouchy, François

AU - Burke, Christopher J.

AU - Christiansen, Jessie L.

AU - Dumusque, Xavier

AU - Keniger, Marcelo Aron Fetzner

AU - Hadjigeorghiou, Andreas

AU - Hawthorn, Faith

AU - Helled, Ravit

AU - Jenkins, Jon M.

AU - Latham, David W.

AU - Lillo-Box, Jorge

AU - Nielsen, Louise D.

AU - Osborn, Hugh P.

AU - Rodrigues, Jose

AU - Rodriguez, David

AU - Santos, Nuno C.

AU - Seager, Sara

AU - Strøm, Paul A.

AU - Torres, Guillermo

AU - Twicken, Joseph D.

AU - Udry, Stephane

AU - Wheatley, Peter J.

AU - Winn, Joshua N.

PY - 2023/10/1

Y1 - 2023/10/1

N2 - We report the discovery of two exoplanets orbiting around HD 212729 (TOI 1052, TIC 317060587), a Teff = 6146 K star with V = 9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass and transits the star, and an additional planet TOI-1052c is observed in radial velocities but not seen to transit. We confirm the planetary nature of TOI-1052b using precise radial velocity observations from HARPS and determined its parameters in a joint RV and photometry analysis. TOI-1052b has a radius of R⊙, a mass of 16.9 ± 1.7 M⊙, and an orbital period of 9.14 d. TOI-1052c does not show any transits in the TESS data, and has a minimum mass of M⊙ and an orbital period of 35.8 d, placing it just interior to the 4:1 mean-motion resonance. Both planets are best fit by relatively high but only marginally significant eccentricities of for planet b and for planet c. We perform a dynamical analysis and internal structure model of the planets as well as deriving stellar parameters and chemical abundances. The mean density of TOI-1052b is g cm-3 consistent with an internal structure similar to Neptune. A nearby star is observed in Gaia DR3 with the same distance and proper motion as TOI-1052, at a sky projected separation of 1500 au, making this a potential wide binary star system.

AB - We report the discovery of two exoplanets orbiting around HD 212729 (TOI 1052, TIC 317060587), a Teff = 6146 K star with V = 9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass and transits the star, and an additional planet TOI-1052c is observed in radial velocities but not seen to transit. We confirm the planetary nature of TOI-1052b using precise radial velocity observations from HARPS and determined its parameters in a joint RV and photometry analysis. TOI-1052b has a radius of R⊙, a mass of 16.9 ± 1.7 M⊙, and an orbital period of 9.14 d. TOI-1052c does not show any transits in the TESS data, and has a minimum mass of M⊙ and an orbital period of 35.8 d, placing it just interior to the 4:1 mean-motion resonance. Both planets are best fit by relatively high but only marginally significant eccentricities of for planet b and for planet c. We perform a dynamical analysis and internal structure model of the planets as well as deriving stellar parameters and chemical abundances. The mean density of TOI-1052b is g cm-3 consistent with an internal structure similar to Neptune. A nearby star is observed in Gaia DR3 with the same distance and proper motion as TOI-1052, at a sky projected separation of 1500 au, making this a potential wide binary star system.

KW - planets and satellites: detection

KW - planets and satellites: individual: (TOI-1052, TIC 317060587)

UR - http://www.scopus.com/inward/record.url?scp=85168773780&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85168773780&partnerID=8YFLogxK

U2 - 10.1093/mnras/stad2183

DO - 10.1093/mnras/stad2183

M3 - Article

AN - SCOPUS:85168773780

SN - 0035-8711

VL - 524

SP - 5804

EP - 5816

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS

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